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// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {Counters} from "./libraries/Counters.sol";

library EnumerableSet {

  // To implement this library for multiple types with as little code
  // repetition as possible, we write it in terms of a generic Set type with
  // bytes32 values.
  // The Set implementation uses private functions, and user-facing
  // implementations (such as AddressSet) are just wrappers around the
  // underlying Set.
  // This means that we can only create new EnumerableSets for types that fit
  // in bytes32.
  struct Set {
    // Storage of set values
    bytes32[] _values;

    // Position of the value in the `values` array, plus 1 because index 0
    // means a value is not in the set.
    mapping (bytes32 => uint256) _indexes;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function _add(Set storage set, bytes32 value) private returns (bool) {
    if (!_contains(set, value)) {
      set._values.push(value);
      // The value is stored at length-1, but we add 1 to all indexes
      // and use 0 as a sentinel value
      set._indexes[value] = set._values.length;
      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function _remove(Set storage set, bytes32 value) private returns (bool) {
    // We read and store the value's index to prevent multiple reads from the same storage slot
    uint256 valueIndex = set._indexes[value];

    if (valueIndex != 0) { // Equivalent to contains(set, value)
      // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
      // the array, and then remove the last element (sometimes called as 'swap and pop').
      // This modifies the order of the array, as noted in {at}.

      uint256 toDeleteIndex = valueIndex - 1;
      uint256 lastIndex = set._values.length - 1;

      // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
      // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

      bytes32 lastvalue = set._values[lastIndex];

      // Move the last value to the index where the value to delete is
      set._values[toDeleteIndex] = lastvalue;
      // Update the index for the moved value
      set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

      // Delete the slot where the moved value was stored
      set._values.pop();

      // Delete the index for the deleted slot
      delete set._indexes[value];

      return true;
    } else {
      return false;
    }
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function _contains(Set storage set, bytes32 value) private view returns (bool) {
    return set._indexes[value] != 0;
  }

  /**
   * @dev Returns the number of values on the set. O(1).
   */
  function _length(Set storage set) private view returns (uint256) {
    return set._values.length;
  }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
  function _at(Set storage set, uint256 index) private view returns (bytes32) {
    require(set._values.length > index, "EnumerableSet: index out of bounds");
    return set._values[index];
  }

  function _getValues( Set storage set_ ) private view returns ( bytes32[] storage ) {
    return set_._values;
  }

  // TODO needs insert function that maintains order.
  // TODO needs NatSpec documentation comment.
  /**
   * Inserts new value by moving existing value at provided index to end 
   * of array and setting provided value at provided index
   */
  function _insert(Set storage set_, uint256 index_, bytes32 valueToInsert_ ) private returns ( bool ) {
    require(  set_._values.length > index_ );
    require( !_contains( set_, valueToInsert_ ), "Remove value you wish to insert if you wish to reorder array." );
    bytes32 existingValue_ = _at( set_, index_ );
    set_._values[index_] = valueToInsert_;
    return _add( set_, existingValue_);
  } 

  struct Bytes4Set {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(Bytes4Set storage set, bytes4 value) internal returns (bool) {
    return _add(set._inner, value);
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(Bytes4Set storage set, bytes4 value) internal returns (bool) {
    return _remove(set._inner, value);
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(Bytes4Set storage set, bytes4 value) internal view returns (bool) {
    return _contains(set._inner, value);
  }

  /**
   * @dev Returns the number of values on the set. O(1).
   */
  function length(Bytes4Set storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(Bytes4Set storage set, uint256 index) internal view returns ( bytes4 ) {
    return bytes4( _at( set._inner, index ) );
  }

  function getValues( Bytes4Set storage set_ ) internal view returns ( bytes4[] memory ) {
    bytes4[] memory bytes4Array_;
    for( uint256 iteration_ = 0; _length( set_._inner ) > iteration_; iteration_++ ) {
      bytes4Array_[iteration_] = bytes4( _at( set_._inner, iteration_ ) );
    }
    return bytes4Array_;
  }

  function insert( Bytes4Set storage set_, uint256 index_, bytes4 valueToInsert_ ) internal returns ( bool ) {
    return _insert( set_._inner, index_, valueToInsert_ );
  }

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns ( bytes32 ) {
        return _at(set._inner, index);
    }

  function getValues( Bytes32Set storage set_ ) internal view returns ( bytes4[] memory ) {
    bytes4[] memory bytes4Array_;

      for( uint256 iteration_ = 0; _length( set_._inner ) >= iteration_; iteration_++ ){
        bytes4Array_[iteration_] = bytes4( at( set_, iteration_ ) );
      }

      return bytes4Array_;
  }

  function insert( Bytes32Set storage set_, uint256 index_, bytes32 valueToInsert_ ) internal returns ( bool ) {
    return _insert( set_._inner, index_, valueToInsert_ );
  }

  // AddressSet
  struct AddressSet {
    Set _inner;
  }

  /**
   * @dev Add a value to a set. O(1).
   *
   * Returns true if the value was added to the set, that is if it was not
   * already present.
   */
  function add(AddressSet storage set, address value) internal returns (bool) {
    return _add(set._inner, bytes32(uint256(value)));
  }

  /**
   * @dev Removes a value from a set. O(1).
   *
   * Returns true if the value was removed from the set, that is if it was
   * present.
   */
  function remove(AddressSet storage set, address value) internal returns (bool) {
    return _remove(set._inner, bytes32(uint256(value)));
  }

  /**
   * @dev Returns true if the value is in the set. O(1).
   */
  function contains(AddressSet storage set, address value) internal view returns (bool) {
    return _contains(set._inner, bytes32(uint256(value)));
  }

  /**
   * @dev Returns the number of values in the set. O(1).
   */
  function length(AddressSet storage set) internal view returns (uint256) {
    return _length(set._inner);
  }

  /**
   * @dev Returns the value stored at position `index` in the set. O(1).
   *
   * Note that there are no guarantees on the ordering of values inside the
   * array, and it may change when more values are added or removed.
   *
   * Requirements:
   *
   * - `index` must be strictly less than {length}.
   */
  function at(AddressSet storage set, uint256 index) internal view returns (address) {
    return address(uint256(_at(set._inner, index)));
  }

  /**
   * TODO Might require explicit conversion of bytes32[] to address[].
   *  Might require iteration.
   */
  function getValues( AddressSet storage set_ ) internal view returns ( address[] memory ) {

    address[] memory addressArray;

    for( uint256 iteration_ = 0; _length(set_._inner) >= iteration_; iteration_++ ){
      addressArray[iteration_] = at( set_, iteration_ );
    }

    return addressArray;
  }

  function insert(AddressSet storage set_, uint256 index_, address valueToInsert_ ) internal returns ( bool ) {
    return _insert( set_._inner, index_, bytes32(uint256(valueToInsert_)) );
  }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    struct UInt256Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UInt256Set storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UInt256Set storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UInt256Set storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UInt256Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UInt256Set storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

interface IERC20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {

        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }

    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add( div( a, 2), 1 );
            while (b < c) {
                c = b;
                b = div( add( div( a, b ), b), 2 );
            }
        } else if (a != 0) {
            c = 1;
        }
    }

    function percentageAmount( uint256 total_, uint8 percentage_ ) internal pure returns ( uint256 percentAmount_ ) {
        return div( mul( total_, percentage_ ), 1000 );
    }

    function substractPercentage( uint256 total_, uint8 percentageToSub_ ) internal pure returns ( uint256 result_ ) {
        return sub( total_, div( mul( total_, percentageToSub_ ), 1000 ) );
    }

    function percentageOfTotal( uint256 part_, uint256 total_ ) internal pure returns ( uint256 percent_ ) {
        return div( mul(part_, 100) , total_ );
    }

    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }

    function quadraticPricing( uint256 payment_, uint256 multiplier_ ) internal pure returns (uint256) {
        return sqrrt( mul( multiplier_, payment_ ) );
    }

  function bondingCurve( uint256 supply_, uint256 multiplier_ ) internal pure returns (uint256) {
      return mul( multiplier_, supply_ );
  }
}

abstract contract ERC20 is IERC20 {

  using SafeMath for uint256;

  // TODO comment actual hash value.
  bytes32 constant private ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256( "ERC20Token" );
    
  // Present in ERC777
  mapping (address => uint256) internal _balances;

  // Present in ERC777
  mapping (address => mapping (address => uint256)) internal _allowances;

  // Present in ERC777
  uint256 internal _totalSupply;

  // Present in ERC777
  string internal _name;
    
  // Present in ERC777
  string internal _symbol;
    
  // Present in ERC777
  uint8 internal _decimals;

  constructor (string memory name_, string memory symbol_, uint8 decimals_) {
    _name = name_;
    _symbol = symbol_;
    _decimals = decimals_;
  }

  function name() public view returns (string memory) {
    return _name;
  }

  function symbol() public view returns (string memory) {
    return _symbol;
  }

  function decimals() public view returns (uint8) {
    return _decimals;
  }

  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  function balanceOf(address account) public view virtual override returns (uint256) {
    return _balances[account];
  }

  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    _transfer(msg.sender, recipient, amount);
    return true;
  }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender]
          .sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender]
          .sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
      require(sender != address(0), "ERC20: transfer from the zero address");
      require(recipient != address(0), "ERC20: transfer to the zero address");

      _beforeTokenTransfer(sender, recipient, amount);

      _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
      _balances[recipient] = _balances[recipient].add(amount);
      emit Transfer(sender, recipient, amount);
    }

    function _mint(address account_, uint256 amount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address( this ), account_, amount_);
        _totalSupply = _totalSupply.add(amount_);
        _balances[account_] = _balances[account_].add(amount_);
        emit Transfer(address( this ), account_, amount_);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

  function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal virtual { }
}

interface IERC2612Permit {

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function nonces(address owner) external view returns (uint256);
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    bytes32 public DOMAIN_SEPARATOR;

    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");

        bytes32 hashStruct =
            keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner].current(), deadline));

        bytes32 _hash = keccak256(abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct));

        address signer = ecrecover(_hash, v, r, s);
        require(signer != address(0) && signer == owner, "ZeroSwapPermit: Invalid signature");

        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }

    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}

interface IOwnable {
  function owner() external view returns (address);

  function renounceOwnership() external;
  
  function transferOwnership( address newOwner_ ) external;
}

contract Ownable is IOwnable {
    
  address internal _owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  constructor () {
    _owner = msg.sender;
    emit OwnershipTransferred( address(0), _owner );
  }

  function owner() public view override returns (address) {
    return _owner;
  }

  modifier onlyOwner() {
    require( _owner == msg.sender, "Ownable: caller is not the owner" );
    _;
  }

  function renounceOwnership() public virtual override onlyOwner() {
    emit OwnershipTransferred( _owner, address(0) );
    _owner = address(0);
  }

  function transferOwnership( address newOwner_ ) public virtual override onlyOwner() {
    require( newOwner_ != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred( _owner, newOwner_ );
    _owner = newOwner_;
  }
}

contract VaultOwned is Ownable {
    
  address internal _vault;

  function setVault( address vault_ ) external onlyOwner() returns ( bool ) {
    _vault = vault_;

    return true;
  }

  function vault() public view returns (address) {
    return _vault;
  }

  modifier onlyVault() {
    require( _vault == msg.sender, "VaultOwned: caller is not the Vault" );
    _;
  }

}

contract BASHERC20Token is ERC20Permit, VaultOwned {

    using SafeMath for uint256;

    constructor() ERC20("ATBASH", "BASH", 9) {
      //_mint(msg.sender, 100000000000);
    }

    function mint(address account_, uint256 amount_) external onlyVault() {
        _mint(account_, amount_);
    }

    function burn(uint256 amount) public virtual {
        _burn(msg.sender, amount);
    }
     
    function burnFrom(address account_, uint256 amount_) public virtual {
        _burnFrom(account_, amount_);
    }

    function _burnFrom(address account_, uint256 amount_) public virtual {
        uint256 decreasedAllowance_ =
            allowance(account_, msg.sender).sub(
                amount_,
                "ERC20: burn amount exceeds allowance"
            );

        _approve(account_, msg.sender, decreasedAllowance_);
        _burn(account_, amount_);
    }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.7.5;

import "./SafeMath.sol";

library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        assert(a == b * c + (a % b)); // There is no case in which this doesn't hold

        return c;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IOwnable} from "./interfaces/IOwnable.sol";
import {SafeMath} from "./libraries/SafeMath.sol";
import {Address} from "./libraries/Address.sol";
import {Counters} from "./libraries/Counters.sol";

interface IERC20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract ERC20
  is 
    IERC20
  {

  using SafeMath for uint256;

  // TODO comment actual hash value.
  bytes32 constant private ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256( "ERC20Token" );
    
  // Present in ERC777
  mapping (address => uint256) internal _balances;

  // Present in ERC777
  mapping (address => mapping (address => uint256)) internal _allowances;

  // Present in ERC777
  uint256 internal _totalSupply;

  // Present in ERC777
  string internal _name;
    
  // Present in ERC777
  string internal _symbol;
    
  // Present in ERC777
  uint8 internal _decimals;

  /**
   * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
   * a default value of 18.
   *
   * To select a different value for {decimals}, use {_setupDecimals}.
   *
   * All three of these values are immutable: they can only be set once during
   * construction.
   */
  constructor (string memory name_, string memory symbol_, uint8 decimals_) {
    _name = name_;
    _symbol = symbol_;
    _decimals = decimals_;
  }

  /**
   * @dev Returns the name of the token.
   */
  // Present in ERC777
  function name() public view returns (string memory) {
    return _name;
  }

  /**
   * @dev Returns the symbol of the token, usually a shorter version of the
   * name.
   */
  // Present in ERC777
  function symbol() public view returns (string memory) {
    return _symbol;
  }

  /**
   * @dev Returns the number of decimals used to get its user representation.
   * For example, if `decimals` equals `2`, a balance of `505` tokens should
   * be displayed to a user as `5,05` (`505 / 10 ** 2`).
   *
   * Tokens usually opt for a value of 18, imitating the relationship between
   * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
   * called.
   *
   * NOTE: This information is only used for _display_ purposes: it in
   * no way affects any of the arithmetic of the contract, including
   * {IERC20-balanceOf} and {IERC20-transfer}.
   */
  // Present in ERC777
  function decimals() public view returns (uint8) {
    return _decimals;
  }

  /**
   * @dev See {IERC20-totalSupply}.
   */
  // Present in ERC777
  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {IERC20-balanceOf}.
   */
  // Present in ERC777
  function balanceOf(address account) public view virtual override returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev See {IERC20-transfer}.
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  // Overrideen in ERC777
  // Confirm that this behavior changes 
  function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    _transfer(msg.sender, recipient, amount);
    return true;
  }

    /**
     * @dev See {IERC20-allowance}.
     */
    // Present in ERC777
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    // Present in ERC777
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    // Present in ERC777
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender]
            .sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender]
            .sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

  /**
   * @dev Moves tokens `amount` from `sender` to `recipient`.
   *
   * This is internal function is equivalent to {transfer}, and can be used to
   * e.g. implement automatic token fees, slashing mechanisms, etc.
   *
   * Emits a {Transfer} event.
   *
   * Requirements:
   *
   * - `sender` cannot be the zero address.
   * - `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   */
  function _transfer(address sender, address recipient, uint256 amount) internal virtual {
    require(sender != address(0), "ERC20: transfer from the zero address");
    require(recipient != address(0), "ERC20: transfer to the zero address");

    _beforeTokenTransfer(sender, recipient, amount);

    _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
  }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    // Present in ERC777
    function _mint(address account_, uint256 ammount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address( this ), account_, ammount_);
        _totalSupply = _totalSupply.add(ammount_);
        _balances[account_] = _balances[account_].add(ammount_);
        emit Transfer(address( this ), account_, ammount_);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    // Present in ERC777
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    // Present in ERC777
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */

  /**
   * @dev Hook that is called before any transfer of tokens. This includes
   * minting and burning.
   *
   * Calling conditions:
   *
   * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
   * will be to transferred to `to`.
   * - when `from` is zero, `amount` tokens will be minted for `to`.
   * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
   * - `from` and `to` are never both zero.
   *
   * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
   */
  // Present in ERC777
  function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal virtual { }
}

interface IERC2612Permit {
    /**
     * @dev Sets `amount` as the allowance of `spender` over `owner`'s tokens,
     * given `owner`'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current ERC2612 nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    bytes32 public DOMAIN_SEPARATOR;

    constructor() {

        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(abi.encode(
            keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
            keccak256(bytes(name())),
            keccak256(bytes("1")), // Version
            chainID,
            address(this)
        ));
    }

    /**
     * @dev See {IERC2612Permit-permit}.
     *
     */
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");

        bytes32 hashStruct =
            keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner].current(), deadline));

        bytes32 _hash = keccak256(abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct));

        address signer = ecrecover(_hash, v, r, s);
        require(signer != address(0) && signer == owner, "ZeroSwapPermit: Invalid signature");

        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }

    /**
     * @dev See {IERC2612Permit-nonces}.
     */
    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}

contract Ownable is IOwnable {

    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);

    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }

    function manager() public view override returns (address) {
        return _owner;
    }

    modifier onlyManager() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }

    function renounceManagement() public virtual override onlyManager() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }

    function pushManagement( address newOwner_ ) public virtual override onlyManager() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}

contract sBASH is ERC20Permit, Ownable {

    using SafeMath for uint256;

    modifier onlyStakingContract() {
        require( msg.sender == stakingContract );
        _;
    }

    address public stakingContract;
    address public initializer;

    event LogSupply(uint256 indexed epoch, uint256 timestamp, uint256 totalSupply );
    event LogRebase( uint256 indexed epoch, uint256 rebase, uint256 index );
    event LogStakingContractUpdated( address stakingContract );

    struct Rebase {
        uint epoch;
        uint rebase; // 18 decimals
        uint totalStakedBefore;
        uint totalStakedAfter;
        uint amountRebased;
        uint index;
        uint32 timeOccured;
    }
    Rebase[] public rebases;

    uint public INDEX;

    uint256 private constant MAX_UINT256 = ~uint256(0);
    uint256 private constant INITIAL_FRAGMENTS_SUPPLY = 5000000 * 10**9; // 9 decimal sbash

    // TOTAL_GONS is a multiple of INITIAL_FRAGMENTS_SUPPLY so that _gonsPerFragment is an integer.
    // Use the highest value that fits in a uint256 for max granularity.
    uint256 private constant TOTAL_GONS = MAX_UINT256 - (MAX_UINT256 % INITIAL_FRAGMENTS_SUPPLY);

    // MAX_SUPPLY = maximum integer < (sqrt(4*TOTAL_GONS + 1) - 1) / 2
    uint256 private constant MAX_SUPPLY = ~uint128(0);  // (2^128) - 1

    uint256 private _gonsPerFragment;
    mapping(address => uint256) private _gonBalances;

    mapping ( address => mapping ( address => uint256 ) ) private _allowedValue;

    constructor() ERC20("Staked ATBASH", "sBASH", 9) ERC20Permit() {
        initializer = msg.sender;
        _totalSupply = INITIAL_FRAGMENTS_SUPPLY;
        _gonsPerFragment = TOTAL_GONS.div(_totalSupply);
        //_mint(msg.sender, 100000000000);
    }

    function initialize( address stakingContract_ ) external returns ( bool ) {
        require( msg.sender == initializer );
        require( stakingContract_ != address(0) );
        stakingContract = stakingContract_;
        _gonBalances[ stakingContract ] = TOTAL_GONS;

        emit Transfer( address(0x0), stakingContract, _totalSupply );
        emit LogStakingContractUpdated( stakingContract_ );
        
        initializer = address(0);
        return true;
    }

    function setIndex( uint _INDEX ) external onlyManager() returns ( bool ) {
        require( INDEX == 0 );
        INDEX = gonsForBalance( _INDEX );
        return true;
    }

    /**
        @notice increases sbash supply to increase staking balances relative to profit_
        @param profit_ uint256
        @return uint256
     */
    function rebase( uint256 profit_, uint epoch_ ) public onlyStakingContract() returns ( uint256 ) {
        uint256 rebaseAmount;
        uint256 circulatingSupply_ = circulatingSupply();

        if ( profit_ == 0 ) {
            emit LogSupply( epoch_, block.timestamp, _totalSupply );
            emit LogRebase( epoch_, 0, index() );
            return _totalSupply;
        } else if ( circulatingSupply_ > 0 ){
            rebaseAmount = profit_.mul( _totalSupply ).div( circulatingSupply_ ); // totalSupply / (totalySupply - stakingContractSupplyBalance)
        } else {
            rebaseAmount = profit_;
        }

        _totalSupply = _totalSupply.add( rebaseAmount );

        if ( _totalSupply > MAX_SUPPLY ) {
            _totalSupply = MAX_SUPPLY;
        }

        _gonsPerFragment = TOTAL_GONS.div( _totalSupply );

        _storeRebase( circulatingSupply_, profit_, epoch_ );

        return _totalSupply;
    }

    /**
        @notice emits event with data about rebase
        @param previousCirculating_ uint
        @param profit_ uint
        @param epoch_ uint
        @return bool
     */
    function _storeRebase( uint previousCirculating_, uint profit_, uint epoch_ ) internal returns ( bool ) {
        uint rebasePercent = profit_.mul( 1e18 ).div( previousCirculating_ );

        rebases.push( Rebase ( {
            epoch: epoch_,
            rebase: rebasePercent, // 18 decimals
            totalStakedBefore: previousCirculating_,
            totalStakedAfter: circulatingSupply(),
            amountRebased: profit_,
            index: index(),
            timeOccured: uint32(block.timestamp)
        }));
        
        emit LogSupply( epoch_, block.timestamp, _totalSupply );
        emit LogRebase( epoch_, rebasePercent, index() );

        return true;
    }

    function balanceOf( address who ) public view override returns ( uint256 ) {
        return _gonBalances[ who ].div( _gonsPerFragment );
    }

    function gonsForBalance( uint amount ) public view returns ( uint ) {
        return amount.mul( _gonsPerFragment );
    }

    function balanceForGons( uint gons ) public view returns ( uint ) {
        return gons.div( _gonsPerFragment );
    }

    // Staking contract holds excess sBASH
    // todo: in ohmv2 adds supply in warmup
    function circulatingSupply() public view returns ( uint ) {
        return _totalSupply.sub( balanceOf( stakingContract ) ); // sBASH - stakingContract sBASH
    }

    function index() public view returns ( uint ) {
        return balanceForGons( INDEX );
    }

    function transfer( address to, uint256 value ) public override returns (bool) {
        uint256 gonValue = value.mul( _gonsPerFragment );
        _gonBalances[ msg.sender ] = _gonBalances[ msg.sender ].sub( gonValue );
        _gonBalances[ to ] = _gonBalances[ to ].add( gonValue );
        emit Transfer( msg.sender, to, value );
        return true;
    }

    function allowance( address owner_, address spender ) public view override returns ( uint256 ) {
        return _allowedValue[ owner_ ][ spender ];
    }

    function transferFrom( address from, address to, uint256 value ) public override returns ( bool ) {
       _allowedValue[ from ][ msg.sender ] = _allowedValue[ from ][ msg.sender ].sub( value );
       emit Approval( from, msg.sender,  _allowedValue[ from ][ msg.sender ] );

        uint256 gonValue = gonsForBalance( value );
        _gonBalances[ from ] = _gonBalances[from].sub( gonValue );
        _gonBalances[ to ] = _gonBalances[to].add( gonValue );
        emit Transfer( from, to, value );

        return true;
    }

    function approve( address spender, uint256 value ) public override returns (bool) {
         _allowedValue[ msg.sender ][ spender ] = value;
         emit Approval( msg.sender, spender, value );
         return true;
    }

    // What gets called in a permit
    function _approve( address owner, address spender, uint256 value ) internal override virtual {
        _allowedValue[owner][spender] = value;
        emit Approval( owner, spender, value );
    }

    function increaseAllowance( address spender, uint256 addedValue ) public override returns (bool) {
        _allowedValue[ msg.sender ][ spender ] = _allowedValue[ msg.sender ][ spender ].add( addedValue );
        emit Approval( msg.sender, spender, _allowedValue[ msg.sender ][ spender ] );
        return true;
    }

    function decreaseAllowance( address spender, uint256 subtractedValue ) public override returns (bool) {
        uint256 oldValue = _allowedValue[ msg.sender ][ spender ];
        if (subtractedValue >= oldValue) {
            _allowedValue[ msg.sender ][ spender ] = 0;
        } else {
            _allowedValue[ msg.sender ][ spender ] = oldValue.sub( subtractedValue );
        }
        emit Approval( msg.sender, spender, _allowedValue[ msg.sender ][ spender ] );
        return true;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

interface IOwnable {
    function manager() external view returns (address);

    function renounceManagement() external;

    function pushManagement(address newOwner_) external;

    function pullManagement() external;
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.7.5;

library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard}
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.3._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function addressToString(address _address)
        internal
        pure
        returns (string memory)
    {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);

        _addr[0] = "0";
        _addr[1] = "x";

        for (uint256 i = 0; i < 20; i++) {
            _addr[2 + i * 2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3 + i * 2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }

        return string(_addr);
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IERC20} from "./interfaces/IERC20.sol";
import {IsBash} from "./interfaces/IsBash.sol";
import {IWarmup} from "./interfaces/IWarmup.sol";
import {SafeERC20} from "./libraries/SafeERC20.sol";
import {SafeMath} from "./libraries/SafeMath.sol";
import {Address} from "./libraries/Address.sol";
import {Ownable} from "./types/Ownable.sol";
import {IDistributor} from "./interfaces/IDistributor.sol";

contract ATBASHStaking is Ownable {
    using SafeMath for uint256;
    using SafeMath for uint32;
    using SafeERC20 for IERC20;

    address public immutable Bash;
    address public immutable sBash;

    struct Epoch {
        uint256 number;
        uint256 distribute;
        uint32 length;
        uint32 endTime;
    }
    Epoch public epoch;

    address public distributor;

    address public locker;
    uint256 public totalBonus;

    address public warmupContract;
    uint256 public warmupPeriod;

    constructor(
        address _Bash,
        address _sBash,
        uint32 _epochLength,
        uint256 _firstEpochNumber,
        uint32 _firstEpochTime
    ) {
        require(_Bash != address(0));
        Bash = _Bash;
        require(_sBash != address(0));
        sBash = _sBash;

        epoch = Epoch({
            length: _epochLength,
            number: _firstEpochNumber,
            endTime: _firstEpochTime,
            distribute: 0
        });
    }

    struct Claim {
        uint256 deposit;
        uint256 gons;
        uint256 expiry;
        bool lock; // prevents malicious delays
    }
    mapping(address => Claim) public warmupInfo;

    /**
        @notice stake bash to enter warmup
        @param _amount uint
        @return bool
     */
    function stake(uint256 _amount, address _recipient)
        external
        returns (bool)
    {
        rebase();

        IERC20(Bash).safeTransferFrom(msg.sender, address(this), _amount); // Time = Ohm = Bash

        Claim memory info = warmupInfo[_recipient];
        require(!info.lock, "Deposits for account are locked");

        warmupInfo[_recipient] = Claim({
            deposit: info.deposit.add(_amount),
            gons: info.gons.add(IsBash(sBash).gonsForBalance(_amount)),
            expiry: epoch.number.add(warmupPeriod),
            lock: false
        });
        IERC20(sBash).safeTransfer(warmupContract, _amount);
        return true;
    }

    /**
        @notice retrieve sbash from warmup
        @param _recipient address
     */
    function claim(address _recipient) public {
        Claim memory info = warmupInfo[_recipient];
        if (epoch.number >= info.expiry && info.expiry != 0) {
            delete warmupInfo[_recipient];
            IWarmup(warmupContract).retrieve(
                _recipient,
                IsBash(sBash).balanceForGons(info.gons)
            );
        }
    }

    /**
        @notice forfeit sbash in warmup and retrieve bash
     */
    function forfeit() external {
        Claim memory info = warmupInfo[msg.sender];
        delete warmupInfo[msg.sender];

        IWarmup(warmupContract).retrieve(
            address(this),
            IsBash(sBash).balanceForGons(info.gons)
        );
        IERC20(Bash).safeTransfer(msg.sender, info.deposit);
    }

    /**
        @notice prevent new deposits to address (protection from malicious activity)
     */
    function toggleDepositLock() external {
        warmupInfo[msg.sender].lock = !warmupInfo[msg.sender].lock;
    }

    /**
        @notice redeem sbash for bash
        @param _amount uint
        @param _trigger bool
     */
    function unstake(uint256 _amount, bool _trigger) external {
        if (_trigger) {
            rebase();
        }
        IERC20(sBash).safeTransferFrom(msg.sender, address(this), _amount);
        IERC20(Bash).safeTransfer(msg.sender, _amount);
    }

    /**
        @notice returns the sbash index, which tracks rebase growth
        @return uint
     */
    function index() public view returns (uint256) {
        return IsBash(sBash).index();
    }

    /**
        @notice trigger rebase if epoch over
     */
    function rebase() public {
        if (epoch.endTime <= uint32(block.timestamp)) {
            IsBash(sBash).rebase(epoch.distribute, epoch.number);
            epoch.endTime = epoch.endTime.add32(epoch.length);
            epoch.number++;

            if (distributor != address(0)) {
                IDistributor(distributor).distribute();
            }

            uint256 balance = contractBalance(); // amount of BASH in contract
            uint256 staked = IsBash(sBash).circulatingSupply(); // amount of unstaked sbash
            if (balance <= staked) {
                epoch.distribute = 0;
            } else {
                epoch.distribute = balance.sub(staked);
            }
        }
    }

    /**
        @notice returns contract bash holdings, including bonuses provided
        @return uint
     */
    function contractBalance() public view returns (uint256) {
        return IERC20(Bash).balanceOf(address(this)).add(totalBonus);
    }

    /**
        @notice provide bonus to locked staking contract
        @param _amount uint
     */
    function giveLockBonus(uint256 _amount) external {
        require(msg.sender == locker);
        totalBonus = totalBonus.add(_amount);
        IERC20(sBash).safeTransfer(locker, _amount);
    }

    /**
        @notice reclaim bonus from locked staking contract
        @param _amount uint
     */
    function returnLockBonus(uint256 _amount) external {
        require(msg.sender == locker);
        totalBonus = totalBonus.sub(_amount);
        IERC20(sBash).safeTransferFrom(locker, address(this), _amount);
    }

    enum CONTRACTS {
        DISTRIBUTOR,
        WARMUP,
        LOCKER
    }

    /**
        @notice sets the contract address for LP staking
        @param _contract address
     */
    function setContract(CONTRACTS _contract, address _address)
        external
        onlyManager
    {
        if (_contract == CONTRACTS.DISTRIBUTOR) {
            // 0
            distributor = _address;
        } else if (_contract == CONTRACTS.WARMUP) {
            // 1
            require(
                warmupContract == address(0),
                "Warmup cannot be set more than once"
            );
            warmupContract = _address;
        } else if (_contract == CONTRACTS.LOCKER) {
            // 2
            require(
                locker == address(0),
                "Locker cannot be set more than once"
            );
            locker = _address;
        }
    }

    /**
     * @notice set warmup period in epoch's numbers for new stakers
     * @param _warmupPeriod uint
     */
    function setWarmup(uint256 _warmupPeriod) external onlyManager {
        warmupPeriod = _warmupPeriod;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

interface IERC20 {
    /**
     * @dev Returns the decimals of the token.
     */
    function decimals() external view returns (uint8);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity >=0.7.5;

import "./IERC20.sol";

// sBash 
interface IsBash is IERC20 {
    function rebase( uint256 profit_, uint epoch_) external returns (uint256);

    function circulatingSupply() external view returns (uint256);

    // function balanceOf(address who) external view returns (uint256);

    function gonsForBalance( uint amount ) external view returns ( uint );

    function balanceForGons( uint gons ) external view returns ( uint );
    
    function index() external view returns ( uint );
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import "./IERC20.sol";

interface IWarmup is IERC20 {
    function retrieve( address staker_, uint amount_ ) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {Address} from "../libraries/Address.sol";
import {SafeMath} from "../libraries/SafeMath.sol";
import {IERC20} from "../interfaces/IERC20.sol";

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(
            value
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import "../interfaces/IOwnable.sol";

contract Ownable is IOwnable {
    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(
        address indexed previousOwner,
        address indexed newOwner
    );
    event OwnershipPulled(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _owner = msg.sender;
        emit OwnershipPushed(address(0), _owner);
    }

    function manager() public view override returns (address) {
        return _owner;
    }

    modifier onlyManager() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function renounceManagement() public virtual override onlyManager {
        emit OwnershipPushed(_owner, address(0));
        _owner = address(0);
    }

    function pushManagement(address newOwner_)
        public
        virtual
        override
        onlyManager
    {
        require(
            newOwner_ != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipPushed(_owner, newOwner_);
        _newOwner = newOwner_;
    }

    function pullManagement() public virtual override {
        require(msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled(_owner, _newOwner);
        _owner = _newOwner;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

interface IDistributor {
    function distribute() external returns (bool);
}

/**
 *Submitted for verification at snowtrace.io on 2021-11-05
 */

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IERC20} from "./interfaces/IERC20.sol";
import {ITreasury} from "./interfaces/ITreasury.sol";
import {IERC20Burnable, IERC20Mintable} from "./interfaces/IBash.sol";

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function add32(uint32 a, uint32 b) internal pure returns (uint32) {
        uint32 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function mul32(uint32 a, uint32 b) internal pure returns (uint32) {
        if (a == 0) {
            return 0;
        }

        uint32 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

interface IOwnable {
    function manager() external view returns (address);

    function renounceManagement() external;

    function pushManagement(address newOwner_) external;

    function pullManagement() external;
}

contract Ownable is IOwnable {
    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(
        address indexed previousOwner,
        address indexed newOwner
    );
    event OwnershipPulled(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _owner = msg.sender;
        emit OwnershipPushed(address(0), _owner);
    }

    function manager() public view override returns (address) {
        return _owner;
    }

    modifier onlyManager() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function renounceManagement() public virtual override onlyManager {
        emit OwnershipPushed(_owner, address(0));
        _owner = address(0);
    }

    function pushManagement(address newOwner_)
        public
        virtual
        override
        onlyManager
    {
        require(
            newOwner_ != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipPushed(_owner, newOwner_);
        _newOwner = newOwner_;
    }

    function pullManagement() public virtual override {
        require(msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled(_owner, _newOwner);
        _owner = _newOwner;
    }
}

// interface IERC20 {
//     function decimals() external view returns (uint8);

//     function balanceOf(address account) external view returns (uint256);

//     function transfer(address recipient, uint256 amount)
//         external
//         returns (bool);

//     function approve(address spender, uint256 amount) external returns (bool);

//     function totalSupply() external view returns (uint256);

//     function transferFrom(
//         address sender,
//         address recipient,
//         uint256 amount
//     ) external returns (bool);

//     event Transfer(address indexed from, address indexed to, uint256 value);

//     event Approval(
//         address indexed owner,
//         address indexed spender,
//         uint256 value
//     );
// }

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

interface IBondCalculator {
    function valuation(address pair_, uint256 amount_)
        external
        view
        returns (uint256 _value);
}

contract BashTreasury is Ownable, ITreasury {
    using SafeMath for uint256;
    using SafeMath for uint32;
    using SafeERC20 for IERC20;

    event Deposit(address indexed token, uint256 amount, uint256 value);
    event Withdrawal(address indexed token, uint256 amount, uint256 value);
    event CreateDebt(
        address indexed debtor,
        address indexed token,
        uint256 amount,
        uint256 value
    );
    event RepayDebt(
        address indexed debtor,
        address indexed token,
        uint256 amount,
        uint256 value
    );
    event ReservesManaged(address indexed token, uint256 amount);
    event ReservesUpdated(uint256 indexed totalReserves);
    event ReservesAudited(uint256 indexed totalReserves);
    event RewardsMinted(
        address indexed caller,
        address indexed recipient,
        uint256 amount
    );
    event ChangeQueued(MANAGING indexed managing, address queued);
    event ChangeActivated(
        MANAGING indexed managing,
        address activated,
        bool result
    );

    enum MANAGING {
        RESERVEDEPOSITOR,
        RESERVESPENDER,
        RESERVETOKEN,
        RESERVEMANAGER,
        LIQUIDITYDEPOSITOR,
        LIQUIDITYTOKEN,
        LIQUIDITYMANAGER,
        DEBTOR,
        REWARDMANAGER,
        SBASH
    }

    address public immutable Bash;
    uint32 public immutable secondsNeededForQueue;

    address[] public reserveTokens; // Push only, beware false-positives.
    mapping(address => bool) public isReserveToken;
    mapping(address => uint32) public reserveTokenQueue; // Delays changes to mapping.

    address[] public reserveDepositors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveDepositor;
    mapping(address => uint32) public reserveDepositorQueue; // Delays changes to mapping.

    address[] public reserveSpenders; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveSpender;
    mapping(address => uint32) public reserveSpenderQueue; // Delays changes to mapping.

    address[] public liquidityTokens; // Push only, beware false-positives.
    mapping(address => bool) public isLiquidityToken;
    mapping(address => uint32) public LiquidityTokenQueue; // Delays changes to mapping.

    address[] public liquidityDepositors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isLiquidityDepositor;
    mapping(address => uint32) public LiquidityDepositorQueue; // Delays changes to mapping.

    mapping(address => address) public bondCalculator; // bond calculator for liquidity token

    address[] public reserveManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isReserveManager;
    mapping(address => uint32) public ReserveManagerQueue; // Delays changes to mapping.

    address[] public liquidityManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isLiquidityManager;
    mapping(address => uint32) public LiquidityManagerQueue; // Delays changes to mapping.

    address[] public debtors; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isDebtor;
    mapping(address => uint32) public debtorQueue; // Delays changes to mapping.
    mapping(address => uint256) public debtorBalance;

    address[] public rewardManagers; // Push only, beware false-positives. Only for viewing.
    mapping(address => bool) public isRewardManager;
    mapping(address => uint32) public rewardManagerQueue; // Delays changes to mapping.

    address public sBash;
    uint256 public sBashQueue; // Delays change to sbash address

    uint256 public totalReserves; // Risk-free value of all assets
    uint256 public totalDebt;

    constructor(
        address _Bash, 
        address _DAI, // stable
        uint32 _secondsNeededForQueue
    ) {
        require(_Bash != address(0));
        Bash = _Bash;

        isReserveToken[_DAI] = true;
        reserveTokens.push(_DAI);

        secondsNeededForQueue = _secondsNeededForQueue;
    }

    /**
        @notice allow approved address to deposit an asset for bash
        @param _amount uint
        @param _token address
        @param _profit uint
        @return send_ uint
     */
    function deposit(
        uint256 _amount,
        address _token,
        uint256 _profit
    ) external override returns (uint256 send_) {
        require(
            isReserveToken[_token] || isLiquidityToken[_token],
            "Not accepted"
        );
        IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);

        if (isReserveToken[_token]) {
            require(isReserveDepositor[msg.sender], "Not approved");
        } else {
            require(isLiquidityDepositor[msg.sender], "Not approved");
        }

        uint256 value = tokenValue(_token, _amount); // value of token in BASH
        // mint BASH needed and store amount of rewards for distribution
        send_ = value.sub(_profit);
        IERC20Mintable(Bash).mint(msg.sender, send_);

        totalReserves = totalReserves.add(value);
        emit ReservesUpdated(totalReserves);

        emit Deposit(_token, _amount, value);
    }

    /**
        @notice allow approved address to burn bash for reserves
        @param _amount uint
        @param _token address
     */
    function withdraw(uint256 _amount, address _token) external {
        require(isReserveToken[_token], "Not accepted"); // Only reserves can be used for redemptions
        require(isReserveSpender[msg.sender] == true, "Not approved");

        uint256 value = tokenValue(_token, _amount);
        IERC20Burnable(Bash).burnFrom(msg.sender, value);

        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);

        IERC20(_token).safeTransfer(msg.sender, _amount);

        emit Withdrawal(_token, _amount, value);
    }

    /**
        @notice allow approved address to borrow reserves
        @param _amount uint
        @param _token address
     */
    function incurDebt(uint256 _amount, address _token) external {
        require(isDebtor[msg.sender], "Not approved");
        require(isReserveToken[_token], "Not accepted");

        uint256 value = tokenValue(_token, _amount);

        uint256 maximumDebt = IERC20(sBash).balanceOf(msg.sender); // Can only borrow against sbash held
        uint256 availableDebt = maximumDebt.sub(debtorBalance[msg.sender]);
        require(value <= availableDebt, "Exceeds debt limit");

        debtorBalance[msg.sender] = debtorBalance[msg.sender].add(value);
        totalDebt = totalDebt.add(value);

        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);

        IERC20(_token).transfer(msg.sender, _amount);

        emit CreateDebt(msg.sender, _token, _amount, value);
    }

    /**
        @notice allow approved address to repay borrowed reserves with reserves
        @param _amount uint
        @param _token address
     */
    function repayDebtWithReserve(uint256 _amount, address _token) external {
        require(isDebtor[msg.sender], "Not approved");
        require(isReserveToken[_token], "Not accepted");

        IERC20(_token).safeTransferFrom(msg.sender, address(this), _amount);

        uint256 value = tokenValue(_token, _amount);
        debtorBalance[msg.sender] = debtorBalance[msg.sender].sub(value);
        totalDebt = totalDebt.sub(value);

        totalReserves = totalReserves.add(value);
        emit ReservesUpdated(totalReserves);

        emit RepayDebt(msg.sender, _token, _amount, value);
    }

    /**
        @notice allow approved address to repay borrowed reserves with bash
        @param _amount uint
     */
    function repayDebtWithBash(uint256 _amount) external {
        require(isDebtor[msg.sender], "Not approved");

        IERC20Burnable(Bash).burnFrom(msg.sender, _amount);

        debtorBalance[msg.sender] = debtorBalance[msg.sender].sub(_amount);
        totalDebt = totalDebt.sub(_amount);

        emit RepayDebt(msg.sender, Bash, _amount, _amount);
    }

    /**
        @notice allow approved address to withdraw assets
        @param _token address
        @param _amount uint
     */
    function manage(address _token, uint256 _amount) external {
        if (isLiquidityToken[_token]) {
            require(isLiquidityManager[msg.sender], "Not approved");
        } else {
            require(isReserveManager[msg.sender], "Not approved");
        }

        uint256 value = tokenValue(_token, _amount);
        require(value <= excessReserves(), "Insufficient reserves");

        totalReserves = totalReserves.sub(value);
        emit ReservesUpdated(totalReserves);

        IERC20(_token).safeTransfer(msg.sender, _amount);

        emit ReservesManaged(_token, _amount);
    }

    /**
        @notice send epoch reward to staking contract
     */
    function mintRewards(address _recipient, uint256 _amount) override external {
        require(isRewardManager[msg.sender], "Not approved");
        require(_amount <= excessReserves(), "Insufficient reserves");

        IERC20Mintable(Bash).mint(_recipient, _amount);

        emit RewardsMinted(msg.sender, _recipient, _amount);
    }

    /**
        @notice returns excess reserves not backing tokens
        @return uint
     */
    function excessReserves() public view returns (uint256) {
        return totalReserves.sub(IERC20(Bash).totalSupply().sub(totalDebt));
    }

    /**
        @notice takes inventory of all tracked assets
        @notice always consolidate to recognized reserves before audit
     */
    function auditReserves() external onlyManager {
        uint256 reserves;
        for (uint256 i = 0; i < reserveTokens.length; i++) {
            reserves = reserves.add(
                tokenValue(
                    reserveTokens[i],
                    IERC20(reserveTokens[i]).balanceOf(address(this))
                )
            );
        }
        for (uint256 i = 0; i < liquidityTokens.length; i++) {
            reserves = reserves.add(
                tokenValue(
                    liquidityTokens[i],
                    IERC20(liquidityTokens[i]).balanceOf(address(this))
                )
            );
        }
        totalReserves = reserves;
        emit ReservesUpdated(reserves);
        emit ReservesAudited(reserves);
    }

    /**
        @notice returns BASH valuation of asset
        @param _token address
        @param _amount uint
        @return value_ uint
     */
    function tokenValue(address _token, uint256 _amount)
        public
        view
        override
        returns (uint256 value_)
    {
        if (isReserveToken[_token]) {
            // convert amount to match Bash decimals
            value_ = _amount.mul(10**IERC20(Bash).decimals()).div(
                10**IERC20(_token).decimals()
            );
        } else if (isLiquidityToken[_token]) {
            value_ = IBondCalculator(bondCalculator[_token]).valuation(
                _token,
                _amount
            );
        }
    }

    // function tokenValue(address _token, uint256 _amount) public view override returns (uint256 value_)
    // {
    //     if (isReserveToken[_token]) {
    //         // convert amount to match Bash decimals
    //         value_ = _amount.mul(10**IERC20(Bash).decimals()).div(
    //             10**IERC20(_token).decimals()
    //         );
    //     } else if (isLiquidityToken[_token]) {
    //         value_ = IBondCalculator(bondCalculator[_token]).valuation(
    //             _token,
    //             _amount
    //         );
    //     }
    // }


    /**
        @notice queue address to change boolean in mapping
        @param _managing MANAGING
        @param _address address
        @return bool
     */
    function queue(MANAGING _managing, address _address)
        external
        onlyManager
        returns (bool)
    {
        require(_address != address(0));
        if (_managing == MANAGING.RESERVEDEPOSITOR) {
            // 0
            reserveDepositorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVESPENDER) {
            // 1
            reserveSpenderQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVETOKEN) {
            // 2
            reserveTokenQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.RESERVEMANAGER) {
            // 3
            ReserveManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue.mul32(2)
            );
        } else if (_managing == MANAGING.LIQUIDITYDEPOSITOR) {
            // 4
            LiquidityDepositorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.LIQUIDITYTOKEN) {
            // 5
            LiquidityTokenQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.LIQUIDITYMANAGER) {
            // 6
            LiquidityManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue.mul32(2)
            );
        } else if (_managing == MANAGING.DEBTOR) {
            // 7
            debtorQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.REWARDMANAGER) {
            // 8
            rewardManagerQueue[_address] = uint32(block.timestamp).add32(
                secondsNeededForQueue
            );
        } else if (_managing == MANAGING.SBASH) {
            // 9
            sBashQueue = uint32(block.timestamp).add32(secondsNeededForQueue);
        } else return false;

        emit ChangeQueued(_managing, _address);
        return true;
    }

    /**
        @notice verify queue then set boolean in mapping
        @param _managing MANAGING
        @param _address address
        @param _calculator address
        @return bool
     */
    function toggle(
        MANAGING _managing,
        address _address,
        address _calculator
    ) external onlyManager returns (bool) {
        require(_address != address(0));
        bool result;
        if (_managing == MANAGING.RESERVEDEPOSITOR) {
            // 0
            if (
                requirements(
                    reserveDepositorQueue,
                    isReserveDepositor,
                    _address
                )
            ) {
                reserveDepositorQueue[_address] = 0;
                if (!listContains(reserveDepositors, _address)) {
                    reserveDepositors.push(_address);
                }
            }
            result = !isReserveDepositor[_address];
            isReserveDepositor[_address] = result;
        } else if (_managing == MANAGING.RESERVESPENDER) {
            // 1
            if (requirements(reserveSpenderQueue, isReserveSpender, _address)) {
                reserveSpenderQueue[_address] = 0;
                if (!listContains(reserveSpenders, _address)) {
                    reserveSpenders.push(_address);
                }
            }
            result = !isReserveSpender[_address];
            isReserveSpender[_address] = result;
        } else if (_managing == MANAGING.RESERVETOKEN) {
            // 2
            if (requirements(reserveTokenQueue, isReserveToken, _address)) {
                reserveTokenQueue[_address] = 0;
                if (!listContains(reserveTokens, _address)) {
                    reserveTokens.push(_address);
                }
            }
            result = !isReserveToken[_address];
            isReserveToken[_address] = result;
        } else if (_managing == MANAGING.RESERVEMANAGER) {
            // 3
            if (requirements(ReserveManagerQueue, isReserveManager, _address)) {
                reserveManagers.push(_address);
                ReserveManagerQueue[_address] = 0;
                if (!listContains(reserveManagers, _address)) {
                    reserveManagers.push(_address);
                }
            }
            result = !isReserveManager[_address];
            isReserveManager[_address] = result;
        } else if (_managing == MANAGING.LIQUIDITYDEPOSITOR) {
            // 4
            if (
                requirements(
                    LiquidityDepositorQueue,
                    isLiquidityDepositor,
                    _address
                )
            ) {
                liquidityDepositors.push(_address);
                LiquidityDepositorQueue[_address] = 0;
                if (!listContains(liquidityDepositors, _address)) {
                    liquidityDepositors.push(_address);
                }
            }
            result = !isLiquidityDepositor[_address];
            isLiquidityDepositor[_address] = result;
        } else if (_managing == MANAGING.LIQUIDITYTOKEN) {
            // 5
            if (requirements(LiquidityTokenQueue, isLiquidityToken, _address)) {
                LiquidityTokenQueue[_address] = 0;
                if (!listContains(liquidityTokens, _address)) {
                    liquidityTokens.push(_address);
                }
            }
            result = !isLiquidityToken[_address];
            isLiquidityToken[_address] = result;
            bondCalculator[_address] = _calculator;
        } else if (_managing == MANAGING.LIQUIDITYMANAGER) {
            // 6
            if (
                requirements(
                    LiquidityManagerQueue,
                    isLiquidityManager,
                    _address
                )
            ) {
                LiquidityManagerQueue[_address] = 0;
                if (!listContains(liquidityManagers, _address)) {
                    liquidityManagers.push(_address);
                }
            }
            result = !isLiquidityManager[_address];
            isLiquidityManager[_address] = result;
        } else if (_managing == MANAGING.DEBTOR) {
            // 7
            if (requirements(debtorQueue, isDebtor, _address)) {
                debtorQueue[_address] = 0;
                if (!listContains(debtors, _address)) {
                    debtors.push(_address);
                }
            }
            result = !isDebtor[_address];
            isDebtor[_address] = result;
        } else if (_managing == MANAGING.REWARDMANAGER) {
            // 8
            if (requirements(rewardManagerQueue, isRewardManager, _address)) {
                rewardManagerQueue[_address] = 0;
                if (!listContains(rewardManagers, _address)) {
                    rewardManagers.push(_address);
                }
            }
            result = !isRewardManager[_address];
            isRewardManager[_address] = result;
        } else if (_managing == MANAGING.SBASH) {
            // 9
            sBashQueue = 0;
            sBash = _address;
            result = true;
        } else return false;

        emit ChangeActivated(_managing, _address, result);
        return true;
    }

    /**
        @notice checks requirements and returns altered structs
        @param queue_ mapping( address => uint )
        @param status_ mapping( address => bool )
        @param _address address
        @return bool 
     */
    function requirements(
        mapping(address => uint32) storage queue_,
        mapping(address => bool) storage status_,
        address _address
    ) internal view returns (bool) {
        if (!status_[_address]) {
            require(queue_[_address] != 0, "Must queue");
            require(
                queue_[_address] <= uint32(block.timestamp),
                "Queue not expired"
            );
            return true;
        }
        return false;
    }

    /**
        @notice checks array to ensure against duplicate
        @param _list address[]
        @param _token address
        @return bool
     */
    function listContains(address[] storage _list, address _token)
        internal
        view
        returns (bool)
    {
        for (uint256 i = 0; i < _list.length; i++) {
            if (_list[i] == _token) {
                return true;
            }
        }
        return false;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity <=0.8.10;

interface ITreasury {
    function tokenValue(address _token, uint256 _amount)
        external
        view
        returns (uint256);

    function deposit(
        uint256 _amount,
        address _token,
        uint256 _profit
    ) external returns (uint256);

    function mintRewards(address _recipient, uint256 _amount) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IERC20} from "./IERC20.sol";

interface IERC20Mintable {
    function mint(uint256 amount_) external;

    function mint(address account_, uint256 ammount_) external;
}

interface IERC20Burnable {
    function burnFrom(address account_, uint256 amount_) external;
}

interface IBash is IERC20, IERC20Mintable { }

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {ITreasury} from "./interfaces/ITreasury.sol";

interface IOwnable {
  function policy() external view returns (address);

  function renounceManagement() external;
  
  function pushManagement( address newOwner_ ) external;
  
  function pullManagement() external;
}

contract Ownable is IOwnable {

    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);

    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }

    function policy() public view override returns (address) {
        return _owner;
    }

    modifier onlyPolicy() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }

    function renounceManagement() public virtual override onlyPolicy() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }

    function pushManagement( address newOwner_ ) public virtual override onlyPolicy() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }

    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add( div( a, 2), 1 );
            while (b < c) {
                c = b;
                b = div( add( div( a, b ), b), 2 );
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

library Address {

    function isContract(address account) internal view returns (bool) {

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function addressToString(address _address) internal pure returns(string memory) {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);

        _addr[0] = '0';
        _addr[1] = 'x';

        for(uint256 i = 0; i < 20; i++) {
            _addr[2+i*2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3+i*2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }

        return string(_addr);

    }
}

interface IERC20 {
    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract ERC20 is IERC20 {

    using SafeMath for uint256;

    // TODO comment actual hash value.
    bytes32 constant private ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256( "ERC20Token" );
    
    mapping (address => uint256) internal _balances;

    mapping (address => mapping (address => uint256)) internal _allowances;

    uint256 internal _totalSupply;

    string internal _name;
    
    string internal _symbol;
    
    uint8 internal _decimals;

    constructor (string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account_, uint256 ammount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address( this ), account_, ammount_);
        _totalSupply = _totalSupply.add(ammount_);
        _balances[account_] = _balances[account_].add(ammount_);
        emit Transfer(address( this ), account_, ammount_);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

  function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal virtual { }
}

interface IERC2612Permit {

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function nonces(address owner) external view returns (uint256);
}

library Counters {
    using SafeMath for uint256;

    struct Counter {

        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    bytes32 public DOMAIN_SEPARATOR;

    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");

        bytes32 hashStruct =
            keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner].current(), deadline));

        bytes32 _hash = keccak256(abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct));

        address signer = ecrecover(_hash, v, r, s);
        require(signer != address(0) && signer == owner, "ZeroSwapPermit: Invalid signature");

        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }

    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {

        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

library FullMath {
    function fullMul(uint256 x, uint256 y) private pure returns (uint256 l, uint256 h) {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);
        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;
        require(h < d, 'FullMath::mulDiv: overflow');
        return fullDiv(l, h, d);
    }
}

library FixedPoint {

    struct uq112x112 {
        uint224 _x;
    }

    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = 0x10000000000000000000000000000;
    uint256 private constant Q224 = 0x100000000000000000000000000000000000000000000000000000000;
    uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    function decode112with18(uq112x112 memory self) internal pure returns (uint) {

        return uint(self._x) / 5192296858534827;
    }

    function fraction(uint256 numerator, uint256 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, 'FixedPoint::fraction: division by zero');
        if (numerator == 0) return FixedPoint.uq112x112(0);

        if (numerator <= uint144(-1)) {
            uint256 result = (numerator << RESOLUTION) / denominator;
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        } else {
            uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        }
    }
}

interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

interface IStaking {
    function stake( uint _amount, address _recipient ) external returns ( bool );
}

interface IStakingHelper {
    function stake( uint _amount, address _recipient ) external;
}

contract OlympusBondDepository is Ownable {

    using FixedPoint for *;
    using SafeERC20 for IERC20;
    using SafeMath for uint;




    /* ======== EVENTS ======== */

    event BondCreated( uint deposit, uint indexed payout, uint indexed expires, uint indexed priceInUSD );
    event BondRedeemed( address indexed recipient, uint payout, uint remaining );
    event BondPriceChanged( uint indexed priceInUSD, uint indexed internalPrice, uint indexed debtRatio );
    event ControlVariableAdjustment( uint initialBCV, uint newBCV, uint adjustment, bool addition );




    /* ======== STATE VARIABLES ======== */

    address public immutable bash; // token given as payment for bond
    address public immutable principle; // token used to create bond
    address public immutable treasury; // mints bash when receives principle
    address public immutable DAO; // receives profit share from bond

    AggregatorV3Interface internal priceFeed;

    address public staking; // to auto-stake payout
    address public stakingHelper; // to stake and claim if no staking warmup
    bool public useHelper;

    Terms public terms; // stores terms for new bonds
    Adjust public adjustment; // stores adjustment to BCV data

    mapping( address => Bond ) public bondInfo; // stores bond information for depositors

    uint public totalDebt; // total value of outstanding bonds; used for pricing
    uint public lastDecay; // reference block for debt decay




    /* ======== STRUCTS ======== */

    // Info for creating new bonds
    struct Terms {
        uint controlVariable; // scaling variable for price
        uint vestingTerm; // in blocks
        uint minimumPrice; // vs principle value. 4 decimals (1500 = 0.15)
        uint maxPayout; // in thousandths of a %. i.e. 500 = 0.5%
        uint maxDebt; // 9 decimal debt ratio, max % total supply created as debt
    }

    // Info for bond holder
    struct Bond {
        uint payout; // bash remaining to be paid
        uint vesting; // Blocks left to vest
        uint lastBlock; // Last interaction
        uint pricePaid; // In DAI, for front end viewing
    }

    // Info for incremental adjustments to control variable 
    struct Adjust {
        bool add; // addition or subtraction
        uint rate; // increment
        uint target; // BCV when adjustment finished
        uint buffer; // minimum length (in blocks) between adjustments
        uint lastBlock; // block when last adjustment made
    }




    /* ======== INITIALIZATION ======== */

    constructor ( 
        address _bash,
        address _principle,
        address _treasury, 
        address _DAO,
        address _feed
    ) {
        require( _bash != address(0) );
        bash = _bash;
        require( _principle != address(0) );
        principle = _principle;
        require( _treasury != address(0) );
        treasury = _treasury;
        require( _DAO != address(0) );
        DAO = _DAO;
        require( _feed != address(0) );
        priceFeed = AggregatorV3Interface( _feed );
    }

    /**
     *  @notice initializes bond parameters
     *  @param _controlVariable uint
     *  @param _vestingTerm uint
     *  @param _minimumPrice uint
     *  @param _maxPayout uint
     *  @param _maxDebt uint
     *  @param _initialDebt uint
     */
    function initializeBondTerms( 
        uint _controlVariable, 
        uint _vestingTerm,
        uint _minimumPrice,
        uint _maxPayout,
        uint _maxDebt,
        uint _initialDebt
    ) external onlyPolicy() {
        require( currentDebt() == 0, "Debt must be 0 for initialization" );
        terms = Terms ({
            controlVariable: _controlVariable,
            vestingTerm: _vestingTerm,
            minimumPrice: _minimumPrice,
            maxPayout: _maxPayout,
            maxDebt: _maxDebt
        });
        totalDebt = _initialDebt;
        lastDecay = block.number;
    }



    
    /* ======== POLICY FUNCTIONS ======== */

    enum PARAMETER { VESTING, PAYOUT, DEBT }
    /**
     *  @notice set parameters for new bonds
     *  @param _parameter PARAMETER
     *  @param _input uint
     */
    function setBondTerms ( PARAMETER _parameter, uint _input ) external onlyPolicy() {
        if ( _parameter == PARAMETER.VESTING ) { // 0
            require( _input >= 10000, "Vesting must be longer than 36 hours" );
            terms.vestingTerm = _input;
        } else if ( _parameter == PARAMETER.PAYOUT ) { // 1
            require( _input <= 1000, "Payout cannot be above 1 percent" );
            terms.maxPayout = _input;
        } else if ( _parameter == PARAMETER.DEBT ) { // 3
            terms.maxDebt = _input;
        }
    }

    /**
     *  @notice set control variable adjustment
     *  @param _addition bool
     *  @param _increment uint
     *  @param _target uint
     *  @param _buffer uint
     */
    function setAdjustment ( 
        bool _addition,
        uint _increment, 
        uint _target,
        uint _buffer 
    ) external onlyPolicy() {
        require( _increment <= terms.controlVariable.mul( 25 ).div( 1000 ), "Increment too large" );

        adjustment = Adjust({
            add: _addition,
            rate: _increment,
            target: _target,
            buffer: _buffer,
            lastBlock: block.number
        });
    }

    /**
     *  @notice set contract for auto stake
     *  @param _staking address
     *  @param _helper bool
     */
    function setStaking( address _staking, bool _helper ) external onlyPolicy() {
        require( _staking != address(0) );
        if ( _helper ) {
            useHelper = true;
            stakingHelper = _staking;
        } else {
            useHelper = false;
            staking = _staking;
        }
    }


    

    /* ======== USER FUNCTIONS ======== */

    /**
     *  @notice deposit bond
     *  @param _amount uint
     *  @param _maxPrice uint
     *  @param _depositor address
     *  @return uint
     */
    function deposit( 
        uint _amount, 
        uint _maxPrice,
        address _depositor
    ) external returns ( uint ) {
        require( _depositor != address(0), "Invalid address" );

        decayDebt();
        require( totalDebt <= terms.maxDebt, "Max capacity reached" );
        
        uint priceInUSD = bondPriceInUSD(); // Stored in bond info
        uint nativePrice = _bondPrice();

        require( _maxPrice >= nativePrice, "Slippage limit: more than max price" ); // slippage protection

        uint value = ITreasury( treasury ).tokenValue( principle, _amount );
        uint payout = payoutFor( value ); // payout to bonder is computed

        require( payout >= 10000000, "Bond too small" ); // must be > 0.01 bash ( underflow protection )
        require( payout <= maxPayout(), "Bond too large"); // size protection because there is no slippage

        /**
            asset carries risk and is not minted against
            asset transfered to treasury and rewards minted as payout
         */
        IERC20( principle ).safeTransferFrom( msg.sender, treasury, _amount );
        ITreasury( treasury ).mintRewards( address(this), payout );
        
        // total debt is increased
        totalDebt = totalDebt.add( value ); 
                
        // depositor info is stored
        bondInfo[ _depositor ] = Bond({ 
            payout: bondInfo[ _depositor ].payout.add( payout ),
            vesting: terms.vestingTerm,
            lastBlock: block.number,
            pricePaid: priceInUSD
        });

        // indexed events are emitted
        emit BondCreated( _amount, payout, block.number.add( terms.vestingTerm ), priceInUSD );
        emit BondPriceChanged( bondPriceInUSD(), _bondPrice(), debtRatio() );

        adjust(); // control variable is adjusted
        return payout; 
    }

    /** 
     *  @notice redeem bond for user
     *  @param _recipient address
     *  @param _stake bool
     *  @return uint
     */ 
    function redeem( address _recipient, bool _stake ) external returns ( uint ) {        
        Bond memory info = bondInfo[ _recipient ];
        uint percentVested = percentVestedFor( _recipient ); // (blocks since last interaction / vesting term remaining)

        if ( percentVested >= 10000 ) { // if fully vested
            delete bondInfo[ _recipient ]; // delete user info
            emit BondRedeemed( _recipient, info.payout, 0 ); // emit bond data
            return stakeOrSend( _recipient, _stake, info.payout ); // pay user everything due

        } else { // if unfinished
            // calculate payout vested
            uint payout = info.payout.mul( percentVested ).div( 10000 );

            // store updated deposit info
            bondInfo[ _recipient ] = Bond({
                payout: info.payout.sub( payout ),
                vesting: info.vesting.sub( block.number.sub( info.lastBlock ) ),
                lastBlock: block.number,
                pricePaid: info.pricePaid
            });

            emit BondRedeemed( _recipient, payout, bondInfo[ _recipient ].payout );
            return stakeOrSend( _recipient, _stake, payout );
        }
    }



    
    /* ======== INTERNAL HELPER FUNCTIONS ======== */

    /**
     *  @notice allow user to stake payout automatically
     *  @param _stake bool
     *  @param _amount uint
     *  @return uint
     */
    function stakeOrSend( address _recipient, bool _stake, uint _amount ) internal returns ( uint ) {
        if ( !_stake ) { // if user does not want to stake
            IERC20( bash ).transfer( _recipient, _amount ); // send payout
        } else { // if user wants to stake
            if ( useHelper ) { // use if staking warmup is 0
                IERC20( bash ).approve( stakingHelper, _amount );
                IStakingHelper( stakingHelper ).stake( _amount, _recipient );
            } else {
                IERC20( bash ).approve( staking, _amount );
                IStaking( staking ).stake( _amount, _recipient );
            }
        }
        return _amount;
    }

    /**
     *  @notice makes incremental adjustment to control variable
     */
    function adjust() internal {
        uint blockCanAdjust = adjustment.lastBlock.add( adjustment.buffer );
        if( adjustment.rate != 0 && block.number >= blockCanAdjust ) {
            uint initial = terms.controlVariable;
            if ( adjustment.add ) {
                terms.controlVariable = terms.controlVariable.add( adjustment.rate );
                if ( terms.controlVariable >= adjustment.target ) {
                    adjustment.rate = 0;
                }
            } else {
                terms.controlVariable = terms.controlVariable.sub( adjustment.rate );
                if ( terms.controlVariable <= adjustment.target ) {
                    adjustment.rate = 0;
                }
            }
            adjustment.lastBlock = block.number;
            emit ControlVariableAdjustment( initial, terms.controlVariable, adjustment.rate, adjustment.add );
        }
    }

    /**
     *  @notice reduce total debt
     */
    function decayDebt() internal {
        totalDebt = totalDebt.sub( debtDecay() );
        lastDecay = block.number;
    }




    /* ======== VIEW FUNCTIONS ======== */

    /**
     *  @notice determine maximum bond size
     *  @return uint
     */
    function maxPayout() public view returns ( uint ) {
        return IERC20( bash ).totalSupply().mul( terms.maxPayout ).div( 100000 );
    }

    /**
     *  @notice calculate interest due for new bond
     *  @param _value uint
     *  @return uint
     */
    function payoutFor( uint _value ) public view returns ( uint ) {
        return FixedPoint.fraction( _value, bondPrice() ).decode112with18().div( 1e14 );
    }


    /**
     *  @notice calculate current bond premium
     *  @return price_ uint
     */
    function bondPrice() public view returns ( uint price_ ) {        
        price_ = terms.controlVariable.mul( debtRatio() ).div( 1e5 );
        if ( price_ < terms.minimumPrice ) {
            price_ = terms.minimumPrice;
        }
    }

    /**
     *  @notice calculate current bond price and remove floor if above
     *  @return price_ uint
     */
    function _bondPrice() internal returns ( uint price_ ) {
        price_ = terms.controlVariable.mul( debtRatio() ).div( 1e5 );
        if ( price_ < terms.minimumPrice ) {
            price_ = terms.minimumPrice;        
        } else if ( terms.minimumPrice != 0 ) {
            terms.minimumPrice = 0;
        }
    }

    /**
     *  @notice get asset price from chainlink
     */
    function assetPrice() public view returns (int) {
        ( , int price, , , ) = priceFeed.latestRoundData();
        return price;
    }

    /**
     *  @notice converts bond price to DAI value
     *  @return price_ uint
     */
    function bondPriceInUSD() public view returns ( uint price_ ) {
        price_ = bondPrice().mul( uint( assetPrice() ) ).mul( 1e6 );
    }


    /**
     *  @notice calculate current ratio of debt to bash supply
     *  @return debtRatio_ uint
     */
    function debtRatio() public view returns ( uint debtRatio_ ) {   
        uint supply = IERC20( bash ).totalSupply();
        debtRatio_ = FixedPoint.fraction( 
            currentDebt().mul( 1e9 ), 
            supply
        ).decode112with18().div( 1e18 );
    }

    /**
     *  @notice debt ratio in same terms as reserve bonds
     *  @return uint
     */
    function standardizedDebtRatio() external view returns ( uint ) {
        return debtRatio().mul( uint( assetPrice() ) ).div( 1e8 ); // ETH feed is 8 decimals
    }

    /**
     *  @notice calculate debt factoring in decay
     *  @return uint
     */
    function currentDebt() public view returns ( uint ) {
        return totalDebt.sub( debtDecay() );
    }

    /**
     *  @notice amount to decay total debt by
     *  @return decay_ uint
     */
    function debtDecay() public view returns ( uint decay_ ) {
        uint blocksSinceLast = block.number.sub( lastDecay );
        decay_ = totalDebt.mul( blocksSinceLast ).div( terms.vestingTerm );
        if ( decay_ > totalDebt ) {
            decay_ = totalDebt;
        }
    }


    /**
     *  @notice calculate how far into vesting a depositor is
     *  @param _depositor address
     *  @return percentVested_ uint
     */
    function percentVestedFor( address _depositor ) public view returns ( uint percentVested_ ) {
        Bond memory bond = bondInfo[ _depositor ];
        uint blocksSinceLast = block.number.sub( bond.lastBlock );
        uint vesting = bond.vesting;

        if ( vesting > 0 ) {
            percentVested_ = blocksSinceLast.mul( 10000 ).div( vesting );
        } else {
            percentVested_ = 0;
        }
    }

    /**
     *  @notice calculate amount of bash available for claim by depositor
     *  @param _depositor address
     *  @return pendingPayout_ uint
     */
    function pendingPayoutFor( address _depositor ) external view returns ( uint pendingPayout_ ) {
        uint percentVested = percentVestedFor( _depositor );
        uint payout = bondInfo[ _depositor ].payout;

        if ( percentVested >= 10000 ) {
            pendingPayout_ = payout;
        } else {
            pendingPayout_ = payout.mul( percentVested ).div( 10000 );
        }
    }




    /* ======= AUXILLIARY ======= */

    /**
     *  @notice allow anyone to send lost tokens (excluding principle or bash) to the DAO
     *  @return bool
     */
    function recoverLostToken( address _token ) external returns ( bool ) {
        require( _token != bash );
        require( _token != principle );
        IERC20( _token ).safeTransfer( DAO, IERC20( _token ).balanceOf( address(this) ) );
        return true;
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {ITreasury} from "./interfaces/ITreasury.sol";

interface IOwnable {
  function policy() external view returns (address);

  function renounceManagement() external;
  
  function pushManagement( address newOwner_ ) external;
  
  function pullManagement() external;
}

contract Ownable is IOwnable {

    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(address indexed previousOwner, address indexed newOwner);
    event OwnershipPulled(address indexed previousOwner, address indexed newOwner);

    constructor () {
        _owner = msg.sender;
        emit OwnershipPushed( address(0), _owner );
    }

    function policy() public view override returns (address) {
        return _owner;
    }

    modifier onlyPolicy() {
        require( _owner == msg.sender, "Ownable: caller is not the owner" );
        _;
    }

    function renounceManagement() public virtual override onlyPolicy() {
        emit OwnershipPushed( _owner, address(0) );
        _owner = address(0);
    }

    function pushManagement( address newOwner_ ) public virtual override onlyPolicy() {
        require( newOwner_ != address(0), "Ownable: new owner is the zero address");
        emit OwnershipPushed( _owner, newOwner_ );
        _newOwner = newOwner_;
    }
    
    function pullManagement() public virtual override {
        require( msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled( _owner, _newOwner );
        _owner = _newOwner;
    }
}

library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }

    function sub32(uint32 a, uint32 b, string memory errorMessage) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }

    function sqrrt(uint256 a) internal pure returns (uint c) {
        if (a > 3) {
            c = a;
            uint b = add( div( a, 2), 1 );
            while (b < c) {
                c = b;
                b = div( add( div( a, b ), b), 2 );
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

library Address {

    function isContract(address account) internal view returns (bool) {

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(
        address target, 
        bytes memory data, 
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    function functionCallWithValue(
        address target, 
        bytes memory data, 
        uint256 value, 
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _functionCallWithValue(
        address target, 
        bytes memory data, 
        uint256 weiValue, 
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    function functionStaticCall(
        address target, 
        bytes memory data, 
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    function functionDelegateCall(
        address target, 
        bytes memory data, 
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success, 
        bytes memory returndata, 
        string memory errorMessage
    ) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function addressToString(address _address) internal pure returns(string memory) {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);

        _addr[0] = '0';
        _addr[1] = 'x';

        for(uint256 i = 0; i < 20; i++) {
            _addr[2+i*2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3+i*2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }

        return string(_addr);

    }
}

interface IERC20 {
    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract ERC20 is IERC20 {

    using SafeMath for uint256;

    // TODO comment actual hash value.
    bytes32 constant private ERC20TOKEN_ERC1820_INTERFACE_ID = keccak256( "ERC20Token" );
    
    mapping (address => uint256) internal _balances;

    mapping (address => mapping (address => uint256)) internal _allowances;

    uint256 internal _totalSupply;

    string internal _name;
    
    string internal _symbol;
    
    uint8 internal _decimals;

    constructor (string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender]
            .sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender]
            .sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account_, uint256 ammount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address( this ), account_, ammount_);
        _totalSupply = _totalSupply.add(ammount_);
        _balances[account_] = _balances[account_].add(ammount_);
        emit Transfer(address( this ), account_, ammount_);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

  function _beforeTokenTransfer( address from_, address to_, uint256 amount_ ) internal virtual { }
}

interface IERC2612Permit {

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function nonces(address owner) external view returns (uint256);
}

library Counters {
    using SafeMath for uint256;

    struct Counter {

        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    bytes32 public DOMAIN_SEPARATOR;

    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");

        bytes32 hashStruct =
            keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, _nonces[owner].current(), deadline));

        bytes32 _hash = keccak256(abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct));

        address signer = ecrecover(_hash, v, r, s);
        require(signer != address(0) && signer == owner, "ZeroSwapPermit: Invalid signature");

        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }

    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {

        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender)
            .sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

library FullMath {
    function fullMul(uint256 x, uint256 y) private pure returns (uint256 l, uint256 h) {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);
        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;
        require(h < d, 'FullMath::mulDiv: overflow');
        return fullDiv(l, h, d);
    }
}

library FixedPoint {

    struct uq112x112 {
        uint224 _x;
    }

    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = 0x10000000000000000000000000000;
    uint256 private constant Q224 = 0x100000000000000000000000000000000000000000000000000000000;
    uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    function decode112with18(uq112x112 memory self) internal pure returns (uint) {

        return uint(self._x) / 5192296858534827;
    }

    function fraction(uint256 numerator, uint256 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, 'FixedPoint::fraction: division by zero');
        if (numerator == 0) return FixedPoint.uq112x112(0);

        if (numerator <= uint144(-1)) {
            uint256 result = (numerator << RESOLUTION) / denominator;
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        } else {
            uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
            require(result <= uint224(-1), 'FixedPoint::fraction: overflow');
            return uq112x112(uint224(result));
        }
    }
}

interface AggregatorV3Interface {

  function decimals() external view returns (uint8);
  function description() external view returns (string memory);
  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

interface IStaking {
    function stake( uint _amount, address _recipient ) external returns ( bool );
}

interface IStakingHelper {
    function stake( uint _amount, address _recipient ) external;
}

interface IWETH9 is IERC20 {
    /// @notice Deposit ether to get wrapped ether
    function deposit() external payable;
}

contract SnowbankPriceFeedBondDepository is Ownable {

    using FixedPoint for *;
    using SafeERC20 for IERC20;
    using SafeMath for uint;
    using SafeMath for uint32;




    /* ======== EVENTS ======== */

    event BondCreated( uint deposit, uint indexed payout, uint indexed expires, uint indexed priceInUSD );
    event BondRedeemed( address indexed recipient, uint payout, uint remaining );
    event BondPriceChanged( uint indexed priceInUSD, uint indexed internalPrice, uint indexed debtRatio );
    event ControlVariableAdjustment( uint initialBCV, uint newBCV, uint adjustment, bool addition );




    /* ======== STATE VARIABLES ======== */
    address public immutable OHM; // token given as payment for bond
    address public immutable principle; // token used to create bond
    address public immutable treasury; // mints OHM when receives principle
    address public immutable DAO; // receives profit share from bond

    AggregatorV3Interface internal priceFeed;

    address public staking; // to auto-stake payout
    address public stakingHelper; // to stake and claim if no staking warmup
    bool public useHelper;

    Terms public terms; // stores terms for new bonds
    Adjust public adjustment; // stores adjustment to BCV data

    mapping( address => Bond ) public bondInfo; // stores bond information for depositors

    uint public totalDebt; // total value of outstanding bonds; used for pricing
    uint32 public lastDecay; // reference block for debt decay




    /* ======== STRUCTS ======== */

    // Info for creating new bonds
    struct Terms {
        uint controlVariable; // scaling variable for price
        uint minimumPrice; // vs principle value. 4 decimals (1500 = 0.15)
        uint maxPayout; // in thousandths of a %. i.e. 500 = 0.5%
        uint maxDebt; // 9 decimal debt ratio, max % total supply created as debt
        uint32 vestingTerm; // in seconds
    }

    // Info for bond holder
    struct Bond {
        uint payout; // OHM remaining to be paid
        uint pricePaid; // In DAI, for front end viewing
        uint32 vesting; // Seconds left to vest
        uint32 lastTime; // Last interaction
    }

    // Info for incremental adjustments to control variable 
    struct Adjust {
        bool add; // addition or subtraction
        uint rate; // increment
        uint target; // BCV when adjustment finished
        uint32 buffer; // minimum length (in seconds) between adjustments
        uint32 lastTime; // block when last adjustment made
    }




    /* ======== INITIALIZATION ======== */

    constructor ( 
        address _OHM,
        address _principle,
        address _treasury, 
        address _DAO,
        address _feed
    ) {
        require( _OHM != address(0) );
        OHM = _OHM;
        require( _principle != address(0) );
        principle = _principle;
        require( _treasury != address(0) );
        treasury = _treasury;
        require( _DAO != address(0) );
        DAO = _DAO;
        require( _feed != address(0) );
        priceFeed = AggregatorV3Interface( _feed );
    }

    /**
     *  @notice initializes bond parameters
     *  @param _controlVariable uint
     *  @param _vestingTerm uint
     *  @param _minimumPrice uint
     *  @param _maxPayout uint
     *  @param _maxDebt uint
     *  @param _initialDebt uint
     */
    function initializeBondTerms( 
        uint _controlVariable, 
        uint _minimumPrice,
        uint _maxPayout,
        uint _maxDebt,
        uint _initialDebt,
        uint32 _vestingTerm
    ) external onlyPolicy() {
        require( currentDebt() == 0, "Debt must be 0 for initialization" );
        terms = Terms ({
            controlVariable: _controlVariable,
            vestingTerm: _vestingTerm,
            minimumPrice: _minimumPrice,
            maxPayout: _maxPayout,
            maxDebt: _maxDebt
        });
        totalDebt = _initialDebt;
        lastDecay = uint32(block.timestamp);
    }



    
    /* ======== POLICY FUNCTIONS ======== */

    enum PARAMETER { VESTING, PAYOUT, DEBT, MINPRICE }
    /**
     *  @notice set parameters for new bonds
     *  @param _parameter PARAMETER
     *  @param _input uint
     */
    function setBondTerms ( PARAMETER _parameter, uint _input ) external onlyPolicy() {
        if ( _parameter == PARAMETER.VESTING ) { // 0
            require( _input >= 129600, "Vesting must be longer than 36 hours" );
            terms.vestingTerm = uint32(_input);
        } else if ( _parameter == PARAMETER.PAYOUT ) { // 1
            require( _input <= 1000, "Payout cannot be above 1 percent" );
            terms.maxPayout = _input;
        } else if ( _parameter == PARAMETER.DEBT ) { // 2
            terms.maxDebt = _input;
        } else if ( _parameter == PARAMETER.MINPRICE ) { // 3
            terms.minimumPrice = _input;
        }
    }

    /**
     *  @notice set control variable adjustment
     *  @param _addition bool
     *  @param _increment uint
     *  @param _target uint
     *  @param _buffer uint
     */
    function setAdjustment ( 
        bool _addition,
        uint _increment, 
        uint _target,
        uint32 _buffer 
    ) external onlyPolicy() {

        adjustment = Adjust({
            add: _addition,
            rate: _increment,
            target: _target,
            buffer: _buffer,
            lastTime: uint32(block.timestamp)
        });
    }

    /**
     *  @notice set contract for auto stake
     *  @param _staking address
     *  @param _helper bool
     */
    function setStaking( address _staking, bool _helper ) external onlyPolicy() {
        require( _staking != address(0) );
        if ( _helper ) {
            useHelper = true;
            stakingHelper = _staking;
        } else {
            useHelper = false;
            staking = _staking;
        }
    }


    

    /* ======== USER FUNCTIONS ======== */

    /**
     *  @notice deposit bond
     *  @param _amount uint
     *  @param _maxPrice uint
     *  @param _depositor address
     *  @return uint
     */
    function deposit( 
        uint _amount, 
        uint _maxPrice,
        address _depositor
    ) external payable returns ( uint ) {
        require( _depositor != address(0), "Invalid address" );

        decayDebt();
        require( totalDebt <= terms.maxDebt, "Max capacity reached" );
        
        uint priceInUSD = bondPriceInUSD(); // Stored in bond info
        uint nativePrice = _bondPrice();

        require( _maxPrice >= nativePrice, "Slippage limit: more than max price" ); // slippage protection

        uint value = ITreasury( treasury ).tokenValue( principle, _amount );
        uint payout = payoutFor( value ); // payout to bonder is computed

        require( payout >= 10000000, "Bond too small" ); // must be > 0.01 OHM ( underflow protection )
        require( payout <= maxPayout(), "Bond too large"); // size protection because there is no slippage

        /**
            asset carries risk and is not minted against
            asset transfered to treasury and rewards minted as payout
         */
        if (address(this).balance >= _amount) {
            // pay with WETH9
            IWETH9(principle).deposit{value: _amount}(); // wrap only what is needed to pay
            IWETH9(principle).transfer(treasury, _amount);
        } else {
            IERC20( principle ).safeTransferFrom( msg.sender, treasury, _amount );
        }
        
        ITreasury( treasury ).mintRewards( address(this), payout );
        
        // total debt is increased
        totalDebt = totalDebt.add( value ); 
                
        // depositor info is stored
        bondInfo[ _depositor ] = Bond({ 
            payout: bondInfo[ _depositor ].payout.add( payout ),
            vesting: terms.vestingTerm,
            lastTime: uint32(block.timestamp),
            pricePaid: priceInUSD
        });

        // indexed events are emitted
        emit BondCreated( _amount, payout, block.timestamp.add( terms.vestingTerm ), priceInUSD );
        emit BondPriceChanged( bondPriceInUSD(), _bondPrice(), debtRatio() );

        adjust(); // control variable is adjusted
        refundETH(); //refund user if needed
        return payout; 
    }

    /** 
     *  @notice redeem bond for user
     *  @param _recipient address
     *  @param _stake bool
     *  @return uint
     */ 
    function redeem( address _recipient, bool _stake ) external returns ( uint ) {        
        Bond memory info = bondInfo[ _recipient ];
        uint percentVested = percentVestedFor( _recipient ); // (blocks since last interaction / vesting term remaining)

        if ( percentVested >= 10000 ) { // if fully vested
            delete bondInfo[ _recipient ]; // delete user info
            emit BondRedeemed( _recipient, info.payout, 0 ); // emit bond data
            return stakeOrSend( _recipient, _stake, info.payout ); // pay user everything due

        } else { // if unfinished
            // calculate payout vested
            uint payout = info.payout.mul( percentVested ).div( 10000 );

            // store updated deposit info
            bondInfo[ _recipient ] = Bond({
                payout: info.payout.sub( payout ),
                vesting: info.vesting.sub32( uint32( block.timestamp ).sub32( info.lastTime ) ),
                lastTime: uint32( block.timestamp ),
                pricePaid: info.pricePaid
            });

            emit BondRedeemed( _recipient, payout, bondInfo[ _recipient ].payout );
            return stakeOrSend( _recipient, _stake, payout );
        }
    }



    
    /* ======== INTERNAL HELPER FUNCTIONS ======== */

    /**
     *  @notice allow user to stake payout automatically
     *  @param _stake bool
     *  @param _amount uint
     *  @return uint
     */
    function stakeOrSend( address _recipient, bool _stake, uint _amount ) internal returns ( uint ) {
        if ( !_stake ) { // if user does not want to stake
            IERC20( OHM ).transfer( _recipient, _amount ); // send payout
        } else { // if user wants to stake
            if ( useHelper ) { // use if staking warmup is 0
                IERC20( OHM ).approve( stakingHelper, _amount );
                IStakingHelper( stakingHelper ).stake( _amount, _recipient );
            } else {
                IERC20( OHM ).approve( staking, _amount );
                IStaking( staking ).stake( _amount, _recipient );
            }
        }
        return _amount;
    }

    /**
     *  @notice makes incremental adjustment to control variable
     */
    function adjust() internal {
         uint timeCanAdjust = adjustment.lastTime.add( adjustment.buffer );
         if( adjustment.rate != 0 && block.timestamp >= timeCanAdjust ) {
            uint initial = terms.controlVariable;
            if ( adjustment.add ) {
                terms.controlVariable = terms.controlVariable.add( adjustment.rate );
                if ( terms.controlVariable >= adjustment.target ) {
                    adjustment.rate = 0;
                }
            } else {
                terms.controlVariable = terms.controlVariable.sub( adjustment.rate );
                if ( terms.controlVariable <= adjustment.target ) {
                    adjustment.rate = 0;
                }
            }
            adjustment.lastTime = uint32(block.timestamp);
            emit ControlVariableAdjustment( initial, terms.controlVariable, adjustment.rate, adjustment.add );
        }
    }

    /**
     *  @notice reduce total debt
     */
    function decayDebt() internal {
        totalDebt = totalDebt.sub( debtDecay() );
        lastDecay = uint32(block.timestamp);
    }




    /* ======== VIEW FUNCTIONS ======== */

    /**
     *  @notice determine maximum bond size
     *  @return uint
     */
    function maxPayout() public view returns ( uint ) {
        return IERC20( OHM ).totalSupply().mul( terms.maxPayout ).div( 100000 );
    }

    /**
     *  @notice calculate interest due for new bond
     *  @param _value uint
     *  @return uint
     */
    function payoutFor( uint _value ) public view returns ( uint ) {
        return FixedPoint.fraction( _value, bondPrice() ).decode112with18().div( 1e14 );
    }


    /**
     *  @notice calculate current bond premium
     *  @return price_ uint
     */
    function bondPrice() public view returns ( uint price_ ) {        
        price_ = terms.controlVariable.mul( debtRatio() ).div( 1e5 );
        if ( price_ < terms.minimumPrice ) {
            price_ = terms.minimumPrice;
        }
    }

    /**
     *  @notice calculate current bond price and remove floor if above
     *  @return price_ uint
     */
    function _bondPrice() internal returns ( uint price_ ) {
        price_ = terms.controlVariable.mul( debtRatio() ).div( 1e5 );
        if ( price_ < terms.minimumPrice ) {
            price_ = terms.minimumPrice;        
        } else if ( terms.minimumPrice != 0 ) {
            terms.minimumPrice = 0;
        }
    }

    /**
     *  @notice get asset price from chainlink
     */
    function assetPrice() public view returns (int) {
        ( , int price, , , ) = priceFeed.latestRoundData();
        return price;
    }

    /**
     *  @notice converts bond price to DAI value
     *  @return price_ uint
     */
    function bondPriceInUSD() public view returns ( uint price_ ) {
        price_ = bondPrice().mul( uint( assetPrice() ) ).mul( 1e6 );
    }


    /**
     *  @notice calculate current ratio of debt to OHM supply
     *  @return debtRatio_ uint
     */
    function debtRatio() public view returns ( uint debtRatio_ ) {   
        uint supply = IERC20( OHM ).totalSupply();
        debtRatio_ = FixedPoint.fraction( 
            currentDebt().mul( 1e9 ), 
            supply
        ).decode112with18().div( 1e18 );
    }

    /**
     *  @notice debt ratio in same terms as reserve bonds
     *  @return uint
     */
    function standardizedDebtRatio() external view returns ( uint ) {
        return debtRatio().mul( uint( assetPrice() ) ).div( 1e8 ); // ETH feed is 8 decimals
    }

    /**
     *  @notice calculate debt factoring in decay
     *  @return uint
     */
    function currentDebt() public view returns ( uint ) {
        return totalDebt.sub( debtDecay() );
    }

    /**
     *  @notice amount to decay total debt by
     *  @return decay_ uint
     */
    function debtDecay() public view returns ( uint decay_ ) {
        uint32 timeSinceLast = uint32(block.timestamp).sub32( lastDecay );
        decay_ = totalDebt.mul( timeSinceLast ).div( terms.vestingTerm );
        if ( decay_ > totalDebt ) {
            decay_ = totalDebt;
        }
    }


    /**
     *  @notice calculate how far into vesting a depositor is
     *  @param _depositor address
     *  @return percentVested_ uint
     */
    function percentVestedFor( address _depositor ) public view returns ( uint percentVested_ ) {
        Bond memory bond = bondInfo[ _depositor ];
        uint secondsSinceLast = uint32(block.timestamp).sub( bond.lastTime );
        uint vesting = bond.vesting;

        if ( vesting > 0 ) {
            percentVested_ = secondsSinceLast.mul( 10000 ).div( vesting );
        } else {
            percentVested_ = 0;
        }
    }

    /**
     *  @notice calculate amount of OHM available for claim by depositor
     *  @param _depositor address
     *  @return pendingPayout_ uint
     */
    function pendingPayoutFor( address _depositor ) external view returns ( uint pendingPayout_ ) {
        uint percentVested = percentVestedFor( _depositor );
        uint payout = bondInfo[ _depositor ].payout;

        if ( percentVested >= 10000 ) {
            pendingPayout_ = payout;
        } else {
            pendingPayout_ = payout.mul( percentVested ).div( 10000 );
        }
    }




    /* ======= AUXILLIARY ======= */

    /**
     *  @notice allow anyone to send lost tokens (excluding principle or OHM) to the DAO
     *  @return bool
     */
    function recoverLostToken( address _token ) external returns ( bool ) {
        require( _token != OHM );
        require( _token != principle );
        IERC20( _token ).safeTransfer( DAO, IERC20( _token ).balanceOf( address(this) ) );
        return true;
    }

    function refundETH() internal {
        if (address(this).balance > 0) safeTransferETH(DAO, address(this).balance);
    }

    /// @notice Transfers ETH to the recipient address
    /// @dev Fails with `STE`
    /// @param to The destination of the transfer
    /// @param value The value to be transferred
    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'STE');
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {ITreasury} from "./interfaces/ITreasury.sol";

interface IOwnable {
  function policy() external view returns (address);

  function renounceManagement() external;

  function pushManagement(address newOwner_) external;

  function pullManagement() external;
}

contract Ownable is IOwnable {
  address internal _owner;
  address internal _newOwner;

  event OwnershipPushed(
    address indexed previousOwner,
    address indexed newOwner
  );
  event OwnershipPulled(
    address indexed previousOwner,
    address indexed newOwner
  );

  constructor() {
    _owner = msg.sender;
    emit OwnershipPushed(address(0), _owner);
  }

  function policy() public view override returns (address) {
    return _owner;
  }

  modifier onlyPolicy() {
    require(_owner == msg.sender, "Ownable: caller is not the owner");
    _;
  }

  function renounceManagement() public virtual override onlyPolicy {
    emit OwnershipPushed(_owner, address(0));
    _owner = address(0);
  }

  function pushManagement(address newOwner_)
    public
    virtual
    override
    onlyPolicy
  {
    require(newOwner_ != address(0), "Ownable: new owner is the zero address");
    emit OwnershipPushed(_owner, newOwner_);
    _newOwner = newOwner_;
  }

  function pullManagement() public virtual override {
    require(msg.sender == _newOwner, "Ownable: must be new owner to pull");
    emit OwnershipPulled(_owner, _newOwner);
    _owner = _newOwner;
  }
}

library SafeMath {
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, "SafeMath: addition overflow");

    return c;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, "SafeMath: subtraction overflow");
  }

  function sub(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;

    return c;
  }

  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");

    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, "SafeMath: division by zero");
  }

  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b > 0, errorMessage);
    uint256 c = a / b;
    return c;
  }

  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, "SafeMath: modulo by zero");
  }

  function mod(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }

  function sqrrt(uint256 a) internal pure returns (uint256 c) {
    if (a > 3) {
      c = a;
      uint256 b = add(div(a, 2), 1);
      while (b < c) {
        c = b;
        b = div(add(div(a, b), b), 2);
      }
    } else if (a != 0) {
      c = 1;
    }
  }
}

library Address {
  function isContract(address account) internal view returns (bool) {
    uint256 size;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      size := extcodesize(account)
    }
    return size > 0;
  }

  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, "Address: insufficient balance");

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success, ) = recipient.call{value: amount}("");
    require(
      success,
      "Address: unable to send value, recipient may have reverted"
    );
  }

  function functionCall(address target, bytes memory data)
    internal
    returns (bytes memory)
  {
    return functionCall(target, data, "Address: low-level call failed");
  }

  function functionCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    return _functionCallWithValue(target, data, 0, errorMessage);
  }

  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value
  ) internal returns (bytes memory) {
    return
      functionCallWithValue(
        target,
        data,
        value,
        "Address: low-level call with value failed"
      );
  }

  function functionCallWithValue(
    address target,
    bytes memory data,
    uint256 value,
    string memory errorMessage
  ) internal returns (bytes memory) {
    require(
      address(this).balance >= value,
      "Address: insufficient balance for call"
    );
    require(isContract(target), "Address: call to non-contract");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return _verifyCallResult(success, returndata, errorMessage);
  }

  function _functionCallWithValue(
    address target,
    bytes memory data,
    uint256 weiValue,
    string memory errorMessage
  ) private returns (bytes memory) {
    require(isContract(target), "Address: call to non-contract");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = target.call{value: weiValue}(
      data
    );
    if (success) {
      return returndata;
    } else {
      // Look for revert reason and bubble it up if present
      if (returndata.length > 0) {
        // The easiest way to bubble the revert reason is using memory via assembly

        // solhint-disable-next-line no-inline-assembly
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }

  function functionStaticCall(address target, bytes memory data)
    internal
    view
    returns (bytes memory)
  {
    return
      functionStaticCall(target, data, "Address: low-level static call failed");
  }

  function functionStaticCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal view returns (bytes memory) {
    require(isContract(target), "Address: static call to non-contract");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = target.staticcall(data);
    return _verifyCallResult(success, returndata, errorMessage);
  }

  function functionDelegateCall(address target, bytes memory data)
    internal
    returns (bytes memory)
  {
    return
      functionDelegateCall(
        target,
        data,
        "Address: low-level delegate call failed"
      );
  }

  function functionDelegateCall(
    address target,
    bytes memory data,
    string memory errorMessage
  ) internal returns (bytes memory) {
    require(isContract(target), "Address: delegate call to non-contract");

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = target.delegatecall(data);
    return _verifyCallResult(success, returndata, errorMessage);
  }

  function _verifyCallResult(
    bool success,
    bytes memory returndata,
    string memory errorMessage
  ) private pure returns (bytes memory) {
    if (success) {
      return returndata;
    } else {
      if (returndata.length > 0) {
        assembly {
          let returndata_size := mload(returndata)
          revert(add(32, returndata), returndata_size)
        }
      } else {
        revert(errorMessage);
      }
    }
  }

  function addressToString(address _address)
    internal
    pure
    returns (string memory)
  {
    bytes32 _bytes = bytes32(uint256(_address));
    bytes memory HEX = "0123456789abcdef";
    bytes memory _addr = new bytes(42);

    _addr[0] = "0";
    _addr[1] = "x";

    for (uint256 i = 0; i < 20; i++) {
      _addr[2 + i * 2] = HEX[uint8(_bytes[i + 12] >> 4)];
      _addr[3 + i * 2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
    }

    return string(_addr);
  }
}

interface IERC20 {
  function decimals() external view returns (uint8);

  function totalSupply() external view returns (uint256);

  function balanceOf(address account) external view returns (uint256);

  function transfer(address recipient, uint256 amount) external returns (bool);

  function allowance(address owner, address spender)
    external
    view
    returns (uint256);

  function approve(address spender, uint256 amount) external returns (bool);

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external returns (bool);

  event Transfer(address indexed from, address indexed to, uint256 value);

  event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract ERC20 is IERC20 {
  using SafeMath for uint256;

  // TODO comment actual hash value.
  bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID =
    keccak256("ERC20Token");

  mapping(address => uint256) internal _balances;

  mapping(address => mapping(address => uint256)) internal _allowances;

  uint256 internal _totalSupply;

  string internal _name;

  string internal _symbol;

  uint8 internal _decimals;

  constructor(
    string memory name_,
    string memory symbol_,
    uint8 decimals_
  ) {
    _name = name_;
    _symbol = symbol_;
    _decimals = decimals_;
  }

  function name() public view returns (string memory) {
    return _name;
  }

  function symbol() public view returns (string memory) {
    return _symbol;
  }

  function decimals() public view override returns (uint8) {
    return _decimals;
  }

  function totalSupply() public view override returns (uint256) {
    return _totalSupply;
  }

  function balanceOf(address account)
    public
    view
    virtual
    override
    returns (uint256)
  {
    return _balances[account];
  }

  function transfer(address recipient, uint256 amount)
    public
    virtual
    override
    returns (bool)
  {
    _transfer(msg.sender, recipient, amount);
    return true;
  }

  function allowance(address owner, address spender)
    public
    view
    virtual
    override
    returns (uint256)
  {
    return _allowances[owner][spender];
  }

  function approve(address spender, uint256 amount)
    public
    virtual
    override
    returns (bool)
  {
    _approve(msg.sender, spender, amount);
    return true;
  }

  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) public virtual override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(
      sender,
      msg.sender,
      _allowances[sender][msg.sender].sub(
        amount,
        "ERC20: transfer amount exceeds allowance"
      )
    );
    return true;
  }

  function increaseAllowance(address spender, uint256 addedValue)
    public
    virtual
    returns (bool)
  {
    _approve(
      msg.sender,
      spender,
      _allowances[msg.sender][spender].add(addedValue)
    );
    return true;
  }

  function decreaseAllowance(address spender, uint256 subtractedValue)
    public
    virtual
    returns (bool)
  {
    _approve(
      msg.sender,
      spender,
      _allowances[msg.sender][spender].sub(
        subtractedValue,
        "ERC20: decreased allowance below zero"
      )
    );
    return true;
  }

  function _transfer(
    address sender,
    address recipient,
    uint256 amount
  ) internal virtual {
    require(sender != address(0), "ERC20: transfer from the zero address");
    require(recipient != address(0), "ERC20: transfer to the zero address");

    _beforeTokenTransfer(sender, recipient, amount);

    _balances[sender] = _balances[sender].sub(
      amount,
      "ERC20: transfer amount exceeds balance"
    );
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
  }

  function _mint(address account_, uint256 ammount_) internal virtual {
    require(account_ != address(0), "ERC20: mint to the zero address");
    _beforeTokenTransfer(address(this), account_, ammount_);
    _totalSupply = _totalSupply.add(ammount_);
    _balances[account_] = _balances[account_].add(ammount_);
    emit Transfer(address(this), account_, ammount_);
  }

  function _burn(address account, uint256 amount) internal virtual {
    require(account != address(0), "ERC20: burn from the zero address");

    _beforeTokenTransfer(account, address(0), amount);

    _balances[account] = _balances[account].sub(
      amount,
      "ERC20: burn amount exceeds balance"
    );
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
  }

  function _approve(
    address owner,
    address spender,
    uint256 amount
  ) internal virtual {
    require(owner != address(0), "ERC20: approve from the zero address");
    require(spender != address(0), "ERC20: approve to the zero address");

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }

  function _beforeTokenTransfer(
    address from_,
    address to_,
    uint256 amount_
  ) internal virtual {}
}

interface IERC2612Permit {
  function permit(
    address owner,
    address spender,
    uint256 amount,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

  function nonces(address owner) external view returns (uint256);
}

library Counters {
  using SafeMath for uint256;

  struct Counter {
    uint256 _value; // default: 0
  }

  function current(Counter storage counter) internal view returns (uint256) {
    return counter._value;
  }

  function increment(Counter storage counter) internal {
    counter._value += 1;
  }

  function decrement(Counter storage counter) internal {
    counter._value = counter._value.sub(1);
  }
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
  using Counters for Counters.Counter;

  mapping(address => Counters.Counter) private _nonces;

  // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
  bytes32 public constant PERMIT_TYPEHASH =
    0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

  bytes32 public DOMAIN_SEPARATOR;

  constructor() {
    uint256 chainID;
    assembly {
      chainID := chainid()
    }

    DOMAIN_SEPARATOR = keccak256(
      abi.encode(
        keccak256(
          "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        ),
        keccak256(bytes(name())),
        keccak256(bytes("1")), // Version
        chainID,
        address(this)
      )
    );
  }

  function permit(
    address owner,
    address spender,
    uint256 amount,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) public virtual override {
    require(block.timestamp <= deadline, "Permit: expired deadline");

    bytes32 hashStruct = keccak256(
      abi.encode(
        PERMIT_TYPEHASH,
        owner,
        spender,
        amount,
        _nonces[owner].current(),
        deadline
      )
    );

    bytes32 _hash = keccak256(
      abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)
    );

    address signer = ecrecover(_hash, v, r, s);
    require(
      signer != address(0) && signer == owner,
      "ZeroSwapPermit: Invalid signature"
    );

    _nonces[owner].increment();
    _approve(owner, spender, amount);
  }

  function nonces(address owner) public view override returns (uint256) {
    return _nonces[owner].current();
  }
}

library SafeERC20 {
  using SafeMath for uint256;
  using Address for address;

  function safeTransfer(
    IERC20 token,
    address to,
    uint256 value
  ) internal {
    _callOptionalReturn(
      token,
      abi.encodeWithSelector(token.transfer.selector, to, value)
    );
  }

  function safeTransferFrom(
    IERC20 token,
    address from,
    address to,
    uint256 value
  ) internal {
    _callOptionalReturn(
      token,
      abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
    );
  }

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    require(
      (value == 0) || (token.allowance(address(this), spender) == 0),
      "SafeERC20: approve from non-zero to non-zero allowance"
    );
    _callOptionalReturn(
      token,
      abi.encodeWithSelector(token.approve.selector, spender, value)
    );
  }

  function safeIncreaseAllowance(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    uint256 newAllowance = token.allowance(address(this), spender).add(value);
    _callOptionalReturn(
      token,
      abi.encodeWithSelector(token.approve.selector, spender, newAllowance)
    );
  }

  function safeDecreaseAllowance(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    uint256 newAllowance = token.allowance(address(this), spender).sub(
      value,
      "SafeERC20: decreased allowance below zero"
    );
    _callOptionalReturn(
      token,
      abi.encodeWithSelector(token.approve.selector, spender, newAllowance)
    );
  }

  function _callOptionalReturn(IERC20 token, bytes memory data) private {
    bytes memory returndata = address(token).functionCall(
      data,
      "SafeERC20: low-level call failed"
    );
    if (returndata.length > 0) {
      // Return data is optional
      // solhint-disable-next-line max-line-length
      require(
        abi.decode(returndata, (bool)),
        "SafeERC20: ERC20 operation did not succeed"
      );
    }
  }
}

library FullMath {
  function fullMul(uint256 x, uint256 y)
    private
    pure
    returns (uint256 l, uint256 h)
  {
    uint256 mm = mulmod(x, y, uint256(-1));
    l = x * y;
    h = mm - l;
    if (mm < l) h -= 1;
  }

  function fullDiv(
    uint256 l,
    uint256 h,
    uint256 d
  ) private pure returns (uint256) {
    uint256 pow2 = d & -d;
    d /= pow2;
    l /= pow2;
    l += h * ((-pow2) / pow2 + 1);
    uint256 r = 1;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    r *= 2 - d * r;
    return l * r;
  }

  function mulDiv(
    uint256 x,
    uint256 y,
    uint256 d
  ) internal pure returns (uint256) {
    (uint256 l, uint256 h) = fullMul(x, y);
    uint256 mm = mulmod(x, y, d);
    if (mm > l) h -= 1;
    l -= mm;
    require(h < d, "FullMath::mulDiv: overflow");
    return fullDiv(l, h, d);
  }
}

library FixedPoint {
  struct uq112x112 {
    uint224 _x;
  }

  struct uq144x112 {
    uint256 _x;
  }

  uint8 private constant RESOLUTION = 112;
  uint256 private constant Q112 = 0x10000000000000000000000000000;
  uint256 private constant Q224 =
    0x100000000000000000000000000000000000000000000000000000000;
  uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

  function decode(uq112x112 memory self) internal pure returns (uint112) {
    return uint112(self._x >> RESOLUTION);
  }

  function decode112with18(uq112x112 memory self)
    internal
    pure
    returns (uint256)
  {
    return uint256(self._x) / 5192296858534827;
  }

  function fraction(uint256 numerator, uint256 denominator)
    internal
    pure
    returns (uq112x112 memory)
  {
    require(denominator > 0, "FixedPoint::fraction: division by zero");
    if (numerator == 0) return FixedPoint.uq112x112(0);

    if (numerator <= uint144(-1)) {
      uint256 result = (numerator << RESOLUTION) / denominator;
      require(result <= uint224(-1), "FixedPoint::fraction: overflow");
      return uq112x112(uint224(result));
    } else {
      uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
      require(result <= uint224(-1), "FixedPoint::fraction: overflow");
      return uq112x112(uint224(result));
    }
  }
}

interface IBondCalculator {
  function valuation(address _LP, uint256 _amount)
    external
    view
    returns (uint256);

  function markdown(address _LP) external view returns (uint256);
}

interface IStaking {
  function stake(uint256 _amount, address _recipient) external returns (bool);
}

interface IStakingHelper {
  function stake(uint256 _amount, address _recipient) external;
}

contract MockOlympusBondDepository is Ownable {
  using FixedPoint for *;
  using SafeERC20 for IERC20;
  using SafeMath for uint256;

  /* ======== EVENTS ======== */

  event BondCreated(
    uint256 deposit,
    uint256 indexed payout,
    uint256 indexed expires,
    uint256 indexed priceInUSD
  );
  event BondRedeemed(
    address indexed recipient,
    uint256 payout,
    uint256 remaining
  );
  event BondPriceChanged(
    uint256 indexed priceInUSD,
    uint256 indexed internalPrice,
    uint256 indexed debtRatio
  );
  event ControlVariableAdjustment(
    uint256 initialBCV,
    uint256 newBCV,
    uint256 adjustment,
    bool addition
  );

  /* ======== STATE VARIABLES ======== */

  address public immutable OHM; // token given as payment for bond
  address public immutable principle; // token used to create bond
  address public immutable treasury; // mints OHM when receives principle
  address public immutable DAO; // receives profit share from bond

  bool public immutable isLiquidityBond; // LP and Reserve bonds are treated slightly different
  address public immutable bondCalculator; // calculates value of LP tokens

  address public staking; // to auto-stake payout
  address public stakingHelper; // to stake and claim if no staking warmup
  bool public useHelper;

  Terms public terms; // stores terms for new bonds
  Adjust public adjustment; // stores adjustment to BCV data

  mapping(address => Bond) public bondInfo; // stores bond information for depositors

  uint256 public totalDebt; // total value of outstanding bonds; used for pricing
  uint256 public lastDecay; // reference block for debt decay

  /* ======== STRUCTS ======== */

  // Info for creating new bonds
  struct Terms {
    uint256 controlVariable; // scaling variable for price
    uint256 vestingTerm; // in blocks
    uint256 minimumPrice; // vs principle value
    uint256 maxPayout; // in thousandths of a %. i.e. 500 = 0.5%
    uint256 fee; // as % of bond payout, in hundreths. ( 500 = 5% = 0.05 for every 1 paid)
    uint256 maxDebt; // 9 decimal debt ratio, max % total supply created as debt
  }

  // Info for bond holder
  struct Bond {
    uint256 payout; // OHM remaining to be paid
    uint256 vesting; // Blocks left to vest
    uint256 lastBlock; // Last interaction
    uint256 pricePaid; // In DAI, for front end viewing
  }

  // Info for incremental adjustments to control variable
  struct Adjust {
    bool add; // addition or subtraction
    uint256 rate; // increment
    uint256 target; // BCV when adjustment finished
    uint256 buffer; // minimum length (in blocks) between adjustments
    uint256 lastBlock; // block when last adjustment made
  }

  /* ======== INITIALIZATION ======== */

  constructor(
    address _OHM,
    address _principle,
    address _treasury,
    address _DAO,
    address _bondCalculator
  ) {
    require(_OHM != address(0));
    OHM = _OHM;
    require(_principle != address(0));
    principle = _principle;
    require(_treasury != address(0));
    treasury = _treasury;
    require(_DAO != address(0));
    DAO = _DAO;
    // bondCalculator should be address(0) if not LP bond
    bondCalculator = _bondCalculator;
    isLiquidityBond = (_bondCalculator != address(0));
  }

  /**
   *  @notice initializes bond parameters
   *  @param _controlVariable uint
   *  @param _vestingTerm uint
   *  @param _minimumPrice uint
   *  @param _maxPayout uint
   *  @param _fee uint
   *  @param _maxDebt uint
   *  @param _initialDebt uint
   */
  function initializeBondTerms(
    uint256 _controlVariable,
    uint256 _vestingTerm,
    uint256 _minimumPrice,
    uint256 _maxPayout,
    uint256 _fee,
    uint256 _maxDebt,
    uint256 _initialDebt
  ) external onlyPolicy {
    require(terms.controlVariable == 0, "Bonds must be initialized from 0");
    terms = Terms({
      controlVariable: _controlVariable,
      vestingTerm: _vestingTerm,
      minimumPrice: _minimumPrice,
      maxPayout: _maxPayout,
      fee: _fee,
      maxDebt: _maxDebt
    });
    totalDebt = _initialDebt;
    lastDecay = block.number;
  }

  /* ======== POLICY FUNCTIONS ======== */

  enum PARAMETER {
    VESTING,
    PAYOUT,
    FEE,
    DEBT
  }

  /**
   *  @notice set parameters for new bonds
   *  @param _parameter PARAMETER
   *  @param _input uint
   */
  function setBondTerms(PARAMETER _parameter, uint256 _input)
    external
    onlyPolicy
  {
    if (_parameter == PARAMETER.VESTING) {
      // 0
      require(_input >= 10000, "Vesting must be longer than 36 hours");
      terms.vestingTerm = _input;
    } else if (_parameter == PARAMETER.PAYOUT) {
      // 1
      require(_input <= 1000, "Payout cannot be above 1 percent");
      terms.maxPayout = _input;
    } else if (_parameter == PARAMETER.FEE) {
      // 2
      require(_input <= 10000, "DAO fee cannot exceed payout");
      terms.fee = _input;
    } else if (_parameter == PARAMETER.DEBT) {
      // 3
      terms.maxDebt = _input;
    }
  }

  /**
   *  @notice set control variable adjustment
   *  @param _addition bool
   *  @param _increment uint
   *  @param _target uint
   *  @param _buffer uint
   */
  function setAdjustment(
    bool _addition,
    uint256 _increment,
    uint256 _target,
    uint256 _buffer
  ) external onlyPolicy {
    require(
      _increment <= terms.controlVariable.mul(25).div(1000),
      "Increment too large"
    );

    adjustment = Adjust({
      add: _addition,
      rate: _increment,
      target: _target,
      buffer: _buffer,
      lastBlock: block.number
    });
  }

  /**
   *  @notice set contract for auto stake
   *  @param _staking address
   *  @param _helper bool
   */
  function setStaking(address _staking, bool _helper) external onlyPolicy {
    require(_staking != address(0));
    if (_helper) {
      useHelper = true;
      stakingHelper = _staking;
    } else {
      useHelper = false;
      staking = _staking;
    }
  }

  /* ======== USER FUNCTIONS ======== */

  /**
   *  @notice deposit bond
   *  @param _amount uint
   *  @param _maxPrice uint
   *  @param _depositor address
   *  @return uint
   */
  function deposit(
    uint256 _amount,
    uint256 _maxPrice,
    address _depositor
  ) external returns (uint256) {
    require(_depositor != address(0), "Invalid address");

    decayDebt();
    require(totalDebt <= terms.maxDebt, "Max capacity reached");

    uint256 priceInUSD = bondPriceInUSD(); // Stored in bond info
    uint256 nativePrice = _bondPrice();

    require(_maxPrice >= nativePrice, "Slippage limit: more than max price"); // slippage protection

    uint256 value = ITreasury(treasury).tokenValue(principle, _amount);
    uint256 payout = payoutFor(value); // payout to bonder is computed

    require(payout >= 10000000, "Bond too small"); // must be > 0.01 OHM ( underflow protection )
    require(payout <= maxPayout(), "Bond too large"); // size protection because there is no slippage

    // profits are calculated
    uint256 fee = payout.mul(terms.fee).div(10000);
    uint256 profit = value.sub(payout).sub(fee);

    /**
            principle is transferred in
            approved and
            deposited into the treasury, returning (_amount - profit) OHM
         */
    IERC20(principle).safeTransferFrom(msg.sender, address(this), _amount);
    IERC20(principle).approve(address(treasury), _amount);
    ITreasury(treasury).deposit(_amount, principle, profit);

    if (fee != 0) {
      // fee is transferred to dao
      IERC20(OHM).safeTransfer(DAO, fee);
    }

    // total debt is increased
    totalDebt = totalDebt.add(value);

    // depositor info is stored
    bondInfo[_depositor] = Bond({
      payout: bondInfo[_depositor].payout.add(payout),
      vesting: terms.vestingTerm,
      lastBlock: block.number,
      pricePaid: priceInUSD
    });

    // indexed events are emitted
    emit BondCreated(
      _amount,
      payout,
      block.number.add(terms.vestingTerm),
      priceInUSD
    );
    emit BondPriceChanged(bondPriceInUSD(), _bondPrice(), debtRatio());

    adjust(); // control variable is adjusted
    return payout;
  }

  /**
   *  @notice redeem bond for user
   *  @param _recipient address
   *  @param _stake bool
   *  @return uint
   */
  function redeem(address _recipient, bool _stake) external returns (uint256) {
    Bond memory info = bondInfo[_recipient];
    uint256 percentVested = percentVestedFor(_recipient); // (blocks since last interaction / vesting term remaining)

    if (percentVested >= 10000) {
      // if fully vested
      delete bondInfo[_recipient]; // delete user info
      emit BondRedeemed(_recipient, info.payout, 0); // emit bond data
      return stakeOrSend(_recipient, _stake, info.payout); // pay user everything due
    } else {
      // if unfinished
      // calculate payout vested
      uint256 payout = info.payout.mul(percentVested).div(10000);

      // store updated deposit info
      bondInfo[_recipient] = Bond({
        payout: info.payout.sub(payout),
        vesting: info.vesting.sub(block.number.sub(info.lastBlock)),
        lastBlock: block.number,
        pricePaid: info.pricePaid
      });

      emit BondRedeemed(_recipient, payout, bondInfo[_recipient].payout);
      return stakeOrSend(_recipient, _stake, payout);
    }
  }

  /* ======== INTERNAL HELPER FUNCTIONS ======== */

  /**
   *  @notice allow user to stake payout automatically
   *  @param _stake bool
   *  @param _amount uint
   *  @return uint
   */
  function stakeOrSend(
    address _recipient,
    bool _stake,
    uint256 _amount
  ) internal returns (uint256) {
    if (!_stake) {
      // if user does not want to stake
      IERC20(OHM).transfer(_recipient, _amount); // send payout
    } else {
      // if user wants to stake
      if (useHelper) {
        // use if staking warmup is 0
        IERC20(OHM).approve(stakingHelper, _amount);
        IStakingHelper(stakingHelper).stake(_amount, _recipient);
      } else {
        IERC20(OHM).approve(staking, _amount);
        IStaking(staking).stake(_amount, _recipient);
      }
    }
    return _amount;
  }

  /**
   *  @notice makes incremental adjustment to control variable
   */
  function adjust() internal {
    uint256 blockCanAdjust = adjustment.lastBlock.add(adjustment.buffer);
    if (adjustment.rate != 0 && block.number >= blockCanAdjust) {
      uint256 initial = terms.controlVariable;
      if (adjustment.add) {
        terms.controlVariable = terms.controlVariable.add(adjustment.rate);
        if (terms.controlVariable >= adjustment.target) {
          adjustment.rate = 0;
        }
      } else {
        terms.controlVariable = terms.controlVariable.sub(adjustment.rate);
        if (terms.controlVariable <= adjustment.target) {
          adjustment.rate = 0;
        }
      }
      adjustment.lastBlock = block.number;
      emit ControlVariableAdjustment(
        initial,
        terms.controlVariable,
        adjustment.rate,
        adjustment.add
      );
    }
  }

  /**
   *  @notice reduce total debt
   */
  function decayDebt() internal {
    totalDebt = totalDebt.sub(debtDecay());
    lastDecay = block.number;
  }

  /* ======== VIEW FUNCTIONS ======== */

  /**
   *  @notice determine maximum bond size
   *  @return uint
   */
  function maxPayout() public view returns (uint256) {
    return IERC20(OHM).totalSupply().mul(terms.maxPayout).div(100000);
  }

  /**
   *  @notice calculate interest due for new bond
   *  @param _value uint
   *  @return uint
   */
  function payoutFor(uint256 _value) public view returns (uint256) {
    return FixedPoint.fraction(_value, bondPrice()).decode112with18().div(1e16);
  }

  /**
   *  @notice calculate current bond premium
   *  @return price_ uint
   */
  function bondPrice() public view returns (uint256 price_) {
    price_ = terms.controlVariable.mul(debtRatio()).add(1000000000).div(1e7);
    if (price_ < terms.minimumPrice) {
      price_ = terms.minimumPrice;
    }
  }

  /**
   *  @notice calculate current bond price and remove floor if above
   *  @return price_ uint
   */
  function _bondPrice() internal returns (uint256 price_) {
    price_ = terms.controlVariable.mul(debtRatio()).add(1000000000).div(1e7);
    if (price_ < terms.minimumPrice) {
      price_ = terms.minimumPrice;
    } else if (terms.minimumPrice != 0) {
      terms.minimumPrice = 0;
    }
  }

  /**
   *  @notice converts bond price to DAI value
   *  @return price_ uint
   */
  function bondPriceInUSD() public view returns (uint256 price_) {
    if (isLiquidityBond) {
      price_ = bondPrice()
        .mul(IBondCalculator(bondCalculator).markdown(principle))
        .div(100);
    } else {
      price_ = bondPrice().mul(10**IERC20(principle).decimals()).div(100);
    }
  }

  /**
   *  @notice calculate current ratio of debt to OHM supply
   *  @return debtRatio_ uint
   */
  function debtRatio() public view returns (uint256 debtRatio_) {
    uint256 supply = IERC20(OHM).totalSupply();
    debtRatio_ = FixedPoint
      .fraction(currentDebt().mul(1e9), supply)
      .decode112with18()
      .div(1e18);
  }

  /**
   *  @notice debt ratio in same terms for reserve or liquidity bonds
   *  @return uint
   */
  function standardizedDebtRatio() external view returns (uint256) {
    if (isLiquidityBond) {
      return
        debtRatio()
          .mul(IBondCalculator(bondCalculator).markdown(principle))
          .div(1e9);
    } else {
      return debtRatio();
    }
  }

  /**
   *  @notice calculate debt factoring in decay
   *  @return uint
   */
  function currentDebt() public view returns (uint256) {
    return totalDebt.sub(debtDecay());
  }

  /**
   *  @notice amount to decay total debt by
   *  @return decay_ uint
   */
  function debtDecay() public view returns (uint256 decay_) {
    uint256 blocksSinceLast = block.number.sub(lastDecay);
    decay_ = totalDebt.mul(blocksSinceLast).div(terms.vestingTerm);
    if (decay_ > totalDebt) {
      decay_ = totalDebt;
    }
  }

  /**
   *  @notice calculate how far into vesting a depositor is
   *  @param _depositor address
   *  @return percentVested_ uint
   */
  function percentVestedFor(address _depositor)
    public
    view
    returns (uint256 percentVested_)
  {
    Bond memory bond = bondInfo[_depositor];
    uint256 blocksSinceLast = block.number.sub(bond.lastBlock);
    uint256 vesting = bond.vesting;

    if (vesting > 0) {
      percentVested_ = blocksSinceLast.mul(10000).div(vesting);
    } else {
      percentVested_ = 0;
    }
  }

  /**
   *  @notice calculate amount of OHM available for claim by depositor
   *  @param _depositor address
   *  @return pendingPayout_ uint
   */
  function pendingPayoutFor(address _depositor)
    external
    view
    returns (uint256 pendingPayout_)
  {
    uint256 percentVested = percentVestedFor(_depositor);
    uint256 payout = bondInfo[_depositor].payout;

    if (percentVested >= 10000) {
      pendingPayout_ = payout;
    } else {
      pendingPayout_ = payout.mul(percentVested).div(10000);
    }
  }

  /* ======= AUXILLIARY ======= */

  /**
   *  @notice allow anyone to send lost tokens (excluding principle or OHM) to the DAO
   *  @return bool
   */
  function recoverLostToken(address _token) external returns (bool) {
    require(_token != OHM);
    require(_token != principle);
    IERC20(_token).safeTransfer(DAO, IERC20(_token).balanceOf(address(this)));
    return true;
  }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import { ITreasury } from "./interfaces/ITreasury.sol";

interface IOwnable {
    function policy() external view returns (address);

    function renounceManagement() external;

    function pushManagement(address newOwner_) external;

    function pullManagement() external;
}

contract Ownable is IOwnable {
    address internal _owner;
    address internal _newOwner;

    event OwnershipPushed(
        address indexed previousOwner,
        address indexed newOwner
    );
    event OwnershipPulled(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        _owner = msg.sender;
        emit OwnershipPushed(address(0), _owner);
    }

    function policy() public view override returns (address) {
        return _owner;
    }

    modifier onlyPolicy() {
        require(_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function renounceManagement() public virtual override onlyPolicy {
        emit OwnershipPushed(_owner, address(0));
        _owner = address(0);
    }

    function pushManagement(address newOwner_)
        public
        virtual
        override
        onlyPolicy
    {
        require(
            newOwner_ != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipPushed(_owner, newOwner_);
        _newOwner = newOwner_;
    }

    function pullManagement() public virtual override {
        require(msg.sender == _newOwner, "Ownable: must be new owner to pull");
        emit OwnershipPulled(_owner, _newOwner);
        _owner = _newOwner;
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function sub32(uint32 a, uint32 b) internal pure returns (uint32) {
        return sub32(a, b, "SafeMath: subtraction overflow");
    }

    function sub32(
        uint32 a,
        uint32 b,
        string memory errorMessage
    ) internal pure returns (uint32) {
        require(b <= a, errorMessage);
        uint32 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }

    function sqrrt(uint256 a) internal pure returns (uint256 c) {
        if (a > 3) {
            c = a;
            uint256 b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function sendValue(address payable recipient, uint256 amount) internal {
        require(
            address(this).balance >= amount,
            "Address: insufficient balance"
        );

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{value: amount}("");
        require(
            success,
            "Address: unable to send value, recipient may have reverted"
        );
    }

    function functionCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return functionCall(target, data, "Address: low-level call failed");
    }

    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return
            functionCallWithValue(
                target,
                data,
                value,
                "Address: low-level call with value failed"
            );
    }

    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(
            address(this).balance >= value,
            "Address: insufficient balance for call"
        );
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: value}(
            data
        );
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _functionCallWithValue(
        address target,
        bytes memory data,
        uint256 weiValue,
        string memory errorMessage
    ) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{value: weiValue}(
            data
        );
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function functionDelegateCall(address target, bytes memory data)
        internal
        returns (bytes memory)
    {
        return
            functionDelegateCall(
                target,
                data,
                "Address: low-level delegate call failed"
            );
    }

    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            if (returndata.length > 0) {
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }

    function addressToString(address _address)
        internal
        pure
        returns (string memory)
    {
        bytes32 _bytes = bytes32(uint256(_address));
        bytes memory HEX = "0123456789abcdef";
        bytes memory _addr = new bytes(42);

        _addr[0] = "0";
        _addr[1] = "x";

        for (uint256 i = 0; i < 20; i++) {
            _addr[2 + i * 2] = HEX[uint8(_bytes[i + 12] >> 4)];
            _addr[3 + i * 2] = HEX[uint8(_bytes[i + 12] & 0x0f)];
        }

        return string(_addr);
    }
}

interface IERC20 {
    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

abstract contract ERC20 is IERC20 {
    using SafeMath for uint256;

    // TODO comment actual hash value.
    bytes32 private constant ERC20TOKEN_ERC1820_INTERFACE_ID =
        keccak256("ERC20Token");

    mapping(address => uint256) internal _balances;

    mapping(address => mapping(address => uint256)) internal _allowances;

    uint256 internal _totalSupply;

    string internal _name;

    string internal _symbol;

    uint8 internal _decimals;

    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view override returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(
            sender,
            msg.sender,
            _allowances[sender][msg.sender].sub(
                amount,
                "ERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].add(addedValue)
        );
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        virtual
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            _allowances[msg.sender][spender].sub(
                subtractedValue,
                "ERC20: decreased allowance below zero"
            )
        );
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(
            amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account_, uint256 ammount_) internal virtual {
        require(account_ != address(0), "ERC20: mint to the zero address");
        _beforeTokenTransfer(address(this), account_, ammount_);
        _totalSupply = _totalSupply.add(ammount_);
        _balances[account_] = _balances[account_].add(ammount_);
        emit Transfer(address(this), account_, ammount_);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(
            amount,
            "ERC20: burn amount exceeds balance"
        );
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _beforeTokenTransfer(
        address from_,
        address to_,
        uint256 amount_
    ) internal virtual {}
}

interface IERC2612Permit {
    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    function nonces(address owner) external view returns (uint256);
}

library Counters {
    using SafeMath for uint256;

    struct Counter {
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

abstract contract ERC20Permit is ERC20, IERC2612Permit {
    using Counters for Counters.Counter;

    mapping(address => Counters.Counter) private _nonces;

    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH =
        0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    bytes32 public DOMAIN_SEPARATOR;

    constructor() {
        uint256 chainID;
        assembly {
            chainID := chainid()
        }

        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256(
                    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                ),
                keccak256(bytes(name())),
                keccak256(bytes("1")), // Version
                chainID,
                address(this)
            )
        );
    }

    function permit(
        address owner,
        address spender,
        uint256 amount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        require(block.timestamp <= deadline, "Permit: expired deadline");

        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                owner,
                spender,
                amount,
                _nonces[owner].current(),
                deadline
            )
        );

        bytes32 _hash = keccak256(
            abi.encodePacked(uint16(0x1901), DOMAIN_SEPARATOR, hashStruct)
        );

        address signer = ecrecover(_hash, v, r, s);
        require(
            signer != address(0) && signer == owner,
            "ZeroSwapPermit: Invalid signature"
        );

        _nonces[owner].increment();
        _approve(owner, spender, amount);
    }

    function nonces(address owner) public view override returns (uint256) {
        return _nonces[owner].current();
    }
}

library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(
            value
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(
            value,
            "SafeERC20: decreased allowance below zero"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        bytes memory returndata = address(token).functionCall(
            data,
            "SafeERC20: low-level call failed"
        );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeERC20: ERC20 operation did not succeed"
            );
        }
    }
}

library FullMath {
    function fullMul(uint256 x, uint256 y)
        private
        pure
        returns (uint256 l, uint256 h)
    {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);
        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;
        require(h < d, "FullMath::mulDiv: overflow");
        return fullDiv(l, h, d);
    }
}

library FixedPoint {
    struct uq112x112 {
        uint224 _x;
    }

    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = 0x10000000000000000000000000000;
    uint256 private constant Q224 =
        0x100000000000000000000000000000000000000000000000000000000;
    uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    function decode112with18(uq112x112 memory self)
        internal
        pure
        returns (uint256)
    {
        return uint256(self._x) / 5192296858534827;
    }

    function fraction(uint256 numerator, uint256 denominator)
        internal
        pure
        returns (uq112x112 memory)
    {
        require(denominator > 0, "FixedPoint::fraction: division by zero");
        if (numerator == 0) return FixedPoint.uq112x112(0);

        if (numerator <= uint144(-1)) {
            uint256 result = (numerator << RESOLUTION) / denominator;
            require(result <= uint224(-1), "FixedPoint::fraction: overflow");
            return uq112x112(uint224(result));
        } else {
            uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
            require(result <= uint224(-1), "FixedPoint::fraction: overflow");
            return uq112x112(uint224(result));
        }
    }
}

interface IBondCalculator {
    function valuation(address _LP, uint256 _amount)
        external
        view
        returns (uint256);

    function markdown(address _LP) external view returns (uint256);
}

interface IStaking {
    function stake(uint256 _amount, address _recipient) external returns (bool);
}

interface IStakingHelper {
    function stake(uint256 _amount, address _recipient) external;
}

contract atbashBondDepository is Ownable {
    using FixedPoint for *;
    using SafeERC20 for IERC20;
    using SafeMath for uint256;
    using SafeMath for uint32;

    /* ======== EVENTS ======== */

    event BondCreated(
        uint256 deposit,
        uint256 indexed payout,
        uint256 indexed expires,
        uint256 indexed priceInUSD
    );
    event BondRedeemed(
        address indexed recipient,
        uint256 payout,
        uint256 remaining
    );
    event BondPriceChanged(
        uint256 indexed priceInUSD,
        uint256 indexed internalPrice,
        uint256 indexed debtRatio
    );
    event ControlVariableAdjustment(
        uint256 initialBCV,
        uint256 newBCV,
        uint256 adjustment,
        bool addition
    );

    /* ======== STATE VARIABLES ======== */

    address public immutable Bash; // token given as payment for bond
    address public immutable principle; // token used to create bond
    address public immutable treasury; // mints bash when receives principle
    address public immutable DAO; // receives profit share from bond

    bool public immutable isLiquidityBond; // LP and Reserve bonds are treated slightly different
    address public immutable bondCalculator; // calculates value of LP tokens

    address public staking; // to auto-stake payout
    address public stakingHelper; // to stake and claim if no staking warmup
    bool public useHelper;

    Terms public terms; // stores terms for new bonds
    Adjust public adjustment; // stores adjustment to BCV data

    mapping(address => Bond) public bondInfo; // stores bond information for depositors

    uint256 public totalDebt; // total value of outstanding bonds; used for pricing
    uint32 public lastDecay; // reference time for debt decay

    /* ======== STRUCTS ======== */

    // Info for creating new bonds
    struct Terms {
        uint256 controlVariable; // scaling variable for price
        uint256 minimumPrice; // vs principle value
        uint256 maxPayout; // in thousandths of a %. i.e. 500 = 0.5%
        uint256 fee; // as % of bond payout, in hundreths. ( 500 = 5% = 0.05 for every 1 paid)
        uint256 maxDebt; // 9 decimal debt ratio, max % total supply created as debt
        uint32 vestingTerm; // in seconds
    }

    // Info for bond holder
    struct Bond {
        uint256 payout; // bash remaining to be paid
        uint256 pricePaid; // In DAI, for front end viewing
        uint32 lastTime; // Last interaction
        uint32 vesting; // Seconds left to vest
    }

    // Info for incremental adjustments to control variable
    struct Adjust {
        bool add; // addition or subtraction
        uint256 rate; // increment
        uint256 target; // BCV when adjustment finished
        uint32 buffer; // minimum length (in seconds) between adjustments
        uint32 lastTime; // time when last adjustment made
    }

    /* ======== INITIALIZATION ======== */

    constructor(
        address _bash,
        address _principle, // dai, bashdai
        address _treasury,
        address _DAO,
        address _bondCalculator
    ) {
        require(_bash != address(0));
        Bash = _bash;
        require(_principle != address(0));
        principle = _principle;
        require(_treasury != address(0));
        treasury = _treasury;
        require(_DAO != address(0));
        DAO = _DAO;
        // bondCalculator should be address(0) if not LP bond
        bondCalculator = _bondCalculator;
        isLiquidityBond = (_bondCalculator != address(0));
    }

    /**
     *  @notice initializes bond parameters
     *  @param _controlVariable uint
     *  @param _vestingTerm uint32
     *  @param _minimumPrice uint
     *  @param _maxPayout uint
     *  @param _fee uint
     *  @param _maxDebt uint
     *  @param _initialDebt uint
     */
    function initializeBondTerms(
        uint256 _controlVariable,
        uint256 _minimumPrice,
        uint256 _maxPayout,
        uint256 _fee,
        uint256 _maxDebt,
        uint256 _initialDebt,
        uint32 _vestingTerm
    ) external onlyPolicy {
        require(terms.controlVariable == 0, "Bonds must be initialized from 0");
        terms = Terms({
            controlVariable: _controlVariable,
            minimumPrice: _minimumPrice,
            maxPayout: _maxPayout,
            fee: _fee,
            maxDebt: _maxDebt,
            vestingTerm: _vestingTerm
        });
        totalDebt = _initialDebt;
        lastDecay = uint32(block.timestamp);
    }

    /* ======== POLICY FUNCTIONS ======== */

    enum PARAMETER {
        VESTING,
        PAYOUT,
        FEE,
        DEBT,
        MINPRICE
    }

    /**
     *  @notice set parameters for new bonds
     *  @param _parameter PARAMETER
     *  @param _input uint
     */
    function setBondTerms(PARAMETER _parameter, uint256 _input)
        external
        onlyPolicy
    {
        if (_parameter == PARAMETER.VESTING) {
            // 0
            require(_input >= 129600, "Vesting must be longer than 36 hours");
            terms.vestingTerm = uint32(_input);
        } else if (_parameter == PARAMETER.PAYOUT) {
            // 1
            require(_input <= 1000, "Payout cannot be above 1 percent");
            terms.maxPayout = _input;
        } else if (_parameter == PARAMETER.FEE) {
            // 2
            require(_input <= 10000, "DAO fee cannot exceed payout");
            terms.fee = _input;
        } else if (_parameter == PARAMETER.DEBT) {
            // 3
            terms.maxDebt = _input;
        } else if (_parameter == PARAMETER.MINPRICE) {
            // 4
            terms.minimumPrice = _input;
        }
    }

    /**
     *  @notice set control variable adjustment
     *  @param _addition bool
     *  @param _increment uint
     *  @param _target uint
     *  @param _buffer uint
     */
    function setAdjustment(
        bool _addition,
        uint256 _increment,
        uint256 _target,
        uint32 _buffer
    ) external onlyPolicy {
        adjustment = Adjust({
            add: _addition,
            rate: _increment,
            target: _target,
            buffer: _buffer,
            lastTime: uint32(block.timestamp)
        });
    }

    /**
     *  @notice set contract for auto stake
     *  @param _staking address
     *  @param _helper bool
     */
    function setStaking(address _staking, bool _helper) external onlyPolicy {
        require(_staking != address(0));
        if (_helper) {
            useHelper = true;
            stakingHelper = _staking;
        } else {
            useHelper = false;
            staking = _staking;
        }
    }

    /* ======== USER FUNCTIONS ======== */

    /**
     *  @notice deposit bond
     *  @param _amount uint
     *  @param _maxPrice uint
     *  @param _depositor address
     *  @return uint
     */
    function deposit(
        uint256 _amount,
        uint256 _maxPrice,
        address _depositor
    ) external returns (uint256) {
        require(_depositor != address(0), "Invalid address");

        decayDebt();
        require(totalDebt <= terms.maxDebt, "Max capacity reached");

        uint256 priceInUSD = bondPriceInUSD(); // Stored in bond info
        uint256 nativePrice = _bondPrice();

        require(
            _maxPrice >= nativePrice,
            "Slippage limit: more than max price"
        ); // slippage protection

        uint256 value = ITreasury(treasury).tokenValue(principle, _amount); // valuation of asset in BASH
        uint256 payout = payoutFor(value); // payout to bonder is computed

        require(payout >= 10000000, "Bond too small"); // must be > 0.01 BASH ( underflow protection )
        require(payout <= maxPayout(), "Bond too large"); // size protection because there is no slippage

        // profits are calculated
        uint256 fee = payout.mul(terms.fee).div(10000);
        uint256 profit = value.sub(payout).sub(fee);

        /**
            principle is transferred in
            approved and
            deposited into the treasury, returning (_amount - profit) BASH
         */
        IERC20(principle).safeTransferFrom(msg.sender, address(this), _amount);
        IERC20(principle).approve(address(treasury), _amount);
        ITreasury(treasury).deposit(_amount, principle, profit);

        if (fee != 0) {
            // fee is transferred to dao
            IERC20(Bash).safeTransfer(DAO, fee);
        }

        // total debt is increased
        totalDebt = totalDebt.add(value); // debt in BASH owed to bonders not yet vested (vested bash is no longer debt)

        // depositor info is stored
        bondInfo[_depositor] = Bond({
            payout: bondInfo[_depositor].payout.add(payout),
            vesting: terms.vestingTerm,
            lastTime: uint32(block.timestamp),
            pricePaid: priceInUSD
        });

        // indexed events are emitted
        emit BondCreated(
            _amount,
            payout,
            block.timestamp.add(terms.vestingTerm),
            priceInUSD
        );
        emit BondPriceChanged(bondPriceInUSD(), _bondPrice(), debtRatio());

        adjust(); // control variable is adjusted
        return payout;
    }

    /**
     *  @notice redeem bond for user
     *  @param _recipient address
     *  @param _stake bool
     *  @return uint
     */
    function redeem(address _recipient, bool _stake)
        external
        returns (uint256)
    {
        Bond memory info = bondInfo[_recipient];
        // (seconds since last interaction / vesting term remaining)
        uint256 percentVested = percentVestedFor(_recipient);

        if (percentVested >= 10000) {
            // if fully vested
            delete bondInfo[_recipient]; // delete user info
            emit BondRedeemed(_recipient, info.payout, 0); // emit bond data
            return stakeOrSend(_recipient, _stake, info.payout); // pay user everything due
        } else {
            // if unfinished
            // calculate payout vested
            uint256 payout = info.payout.mul(percentVested).div(10000);
            // store updated deposit info
            bondInfo[_recipient] = Bond({
                payout: info.payout.sub(payout),
                vesting: info.vesting.sub32(
                    uint32(block.timestamp).sub32(info.lastTime)
                ),
                lastTime: uint32(block.timestamp),
                pricePaid: info.pricePaid
            });

            emit BondRedeemed(_recipient, payout, bondInfo[_recipient].payout);
            return stakeOrSend(_recipient, _stake, payout);
        }
    }

    /* ======== INTERNAL HELPER FUNCTIONS ======== */

    /**
     *  @notice allow user to stake payout automatically
     *  @param _stake bool
     *  @param _amount uint
     *  @return uint
     */
    function stakeOrSend(
        address _recipient,
        bool _stake,
        uint256 _amount
    ) internal returns (uint256) {
        if (!_stake) {
            // if user does not want to stake
            IERC20(Bash).transfer(_recipient, _amount); // send payout
        } else {
            // if user wants to stake
            if (useHelper) {
                // use if staking warmup is 0
                IERC20(Bash).approve(stakingHelper, _amount);
                IStakingHelper(stakingHelper).stake(_amount, _recipient);
            } else {
                IERC20(Bash).approve(staking, _amount);
                IStaking(staking).stake(_amount, _recipient);
            }
        }
        return _amount;
    }

    /**
     *  @notice makes incremental adjustment to control variable
     */
    function adjust() internal {
        uint256 timeCanAdjust = adjustment.lastTime.add(adjustment.buffer);
        if (adjustment.rate != 0 && block.timestamp >= timeCanAdjust) {
            uint256 initial = terms.controlVariable;
            if (adjustment.add) {
                terms.controlVariable = terms.controlVariable.add(
                    adjustment.rate
                );
                if (terms.controlVariable >= adjustment.target) {
                    adjustment.rate = 0;
                }
            } else {
                terms.controlVariable = terms.controlVariable.sub(
                    adjustment.rate
                );
                if (terms.controlVariable <= adjustment.target) {
                    adjustment.rate = 0;
                }
            }
            adjustment.lastTime = uint32(block.timestamp);
            emit ControlVariableAdjustment(
                initial,
                terms.controlVariable,
                adjustment.rate,
                adjustment.add
            );
        }
    }

    /**
     *  @notice reduce total debt
     */
    function decayDebt() internal {
        totalDebt = totalDebt.sub(debtDecay());
        lastDecay = uint32(block.timestamp);
    }

    /* ======== VIEW FUNCTIONS ======== */

    /**
     *  @notice determine maximum bond size
     *  @return uint
     */
    function maxPayout() public view returns (uint256) {
        return IERC20(Bash).totalSupply().mul(terms.maxPayout).div(100000);
    }

    /**
     *  @notice calculate interest due for new bond
     *  @param _value uint
     *  @return uint
     */
    function payoutFor(uint256 _value) public view returns (uint256) {
        // The payout amount in BASH is the deposited asset’s BASH value divided by the bond price
        return
            FixedPoint.fraction(_value, bondPrice()).decode112with18().div(
                1e16
            );
    }

    /**
     *  @notice calculate current bond premium
     *  @return price_ uint
     */
    function bondPrice() public view returns (uint256 price_) {
        price_ = terms.controlVariable.mul(debtRatio()).add(1000000000).div(
            1e7
        );
        if (price_ < terms.minimumPrice) {
            price_ = terms.minimumPrice;
        }
    }

    /**
     *  @notice calculate current bond price and remove floor if above
     *  @return price_ uint
     */
    function _bondPrice() internal returns (uint256 price_) {
        price_ = terms.controlVariable.mul(debtRatio()).add(1000000000).div(
            1e7
        );
        if (price_ < terms.minimumPrice) {
            price_ = terms.minimumPrice;
        } else if (terms.minimumPrice != 0) {
            terms.minimumPrice = 0;
        }
    }

    /**
     *  @notice converts bond price to DAI value
     *  @return price_ uint
     */
    function bondPriceInUSD() public view returns (uint256 price_) {
        if (isLiquidityBond) {
            price_ = bondPrice()
                .mul(IBondCalculator(bondCalculator).markdown(principle))
                .div(100);
        } else {
            price_ = bondPrice().mul(10**IERC20(principle).decimals()).div(100);
        }
    }

    /**
     *  @notice calculate current ratio of debt to BASH supply
     *  @return debtRatio_ uint
     */
    function debtRatio() public view returns (uint256 debtRatio_) {
        uint256 supply = IERC20(Bash).totalSupply();
        debtRatio_ = FixedPoint
            .fraction(currentDebt().mul(1e9), supply)
            .decode112with18()
            .div(1e18);
    }

    /**
     *  @notice debt ratio in same terms for reserve or liquidity bonds
     *  @return uint
     */
    function standardizedDebtRatio() external view returns (uint256) {
        if (isLiquidityBond) {
            return
                debtRatio()
                    .mul(IBondCalculator(bondCalculator).markdown(principle))
                    .div(1e9);
        } else {
            return debtRatio();
        }
    }

    /**
     *  @notice calculate debt factoring in decay
     *  @return uint
     */
    function currentDebt() public view returns (uint256) {
        return totalDebt.sub(debtDecay());
    }

    /**
     *  @notice amount to decay total debt by
     *  @return decay_ uint
     */
    function debtDecay() public view returns (uint256 decay_) {
        uint32 timeSinceLast = uint32(block.timestamp).sub32(lastDecay);
        decay_ = totalDebt.mul(timeSinceLast).div(terms.vestingTerm);
        if (decay_ > totalDebt) {
            decay_ = totalDebt;
        }
    }

    /**
     *  @notice calculate how far into vesting a depositor is
     *  @param _depositor address
     *  @return percentVested_ uint
     */
    function percentVestedFor(address _depositor)
        public
        view
        returns (uint256 percentVested_)
    {
        Bond memory bond = bondInfo[_depositor];
        uint256 secondsSinceLast = uint32(block.timestamp).sub(bond.lastTime);
        uint256 vesting = bond.vesting;

        if (vesting > 0) {
            percentVested_ = secondsSinceLast.mul(10000).div(vesting);
        } else {
            percentVested_ = 0;
        }
    }

    /**
     *  @notice calculate amount of bash available for claim by depositor
     *  @param _depositor address
     *  @return pendingPayout_ uint
     */
    function pendingPayoutFor(address _depositor)
        external
        view
        returns (uint256 pendingPayout_)
    {
        uint256 percentVested = percentVestedFor(_depositor);
        uint256 payout = bondInfo[_depositor].payout;

        if (percentVested >= 10000) {
            pendingPayout_ = payout;
        } else {
            pendingPayout_ = payout.mul(percentVested).div(10000);
        }
    }

    /* ======= AUXILLIARY ======= */

    /**
     *  @notice allow anyone to send lost tokens (excluding principle or bash) to the DAO
     *  @return bool
     */
    function recoverLostToken(address _token) external returns (bool) {
        require(_token != Bash);
        require(_token != principle);
        IERC20(_token).safeTransfer(
            DAO,
            IERC20(_token).balanceOf(address(this))
        );
        return true;
    }
}

/**
 *Submitted for verification at Etherscan.io on 2021-06-12
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;

import {IsBash} from "./interfaces/IsBash.sol";

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}


/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

contract wsBASH is ERC20 {
    using SafeERC20 for ERC20;
    using Address for address;
    using SafeMath for uint;

    address public immutable sBash;

    constructor( address _sBash ) ERC20( 'Wrapped sBASH', 'wsBASH' ) {
        require( _sBash != address(0) );
        sBash = _sBash;
    }

    /**
        @notice wrap sBash
        @param _amount uint
        @return uint
     */
    function wrap( uint _amount ) external returns ( uint ) {
        IERC20( sBash ).transferFrom( msg.sender, address(this), _amount );
        
        uint value = sBashTowsBash( _amount );
        _mint( msg.sender, value );
        return value;
    }

    /**
        @notice unwrap sBash
        @param _amount uint
        @return uint
     */
    function unwrap( uint _amount ) external returns ( uint ) {
        _burn( msg.sender, _amount );

        uint value = wsBashTosBash( _amount );
        IERC20( sBash ).transfer( msg.sender, value );
        return value;
    }

    /**
        @notice converts wsBash amount to sBash
        @param _amount uint
        @return uint
     */
    function wsBashTosBash( uint _amount ) public view returns ( uint ) {
        return _amount.mul( IsBash( sBash ).index() ).div( 10 ** decimals() );
    }

    /**
        @notice converts sBash amount to wsBash
        @param _amount uint
        @return uint
     */
    function sBashTowsBash( uint _amount ) public view returns ( uint ) {
        return _amount.mul( 10 ** decimals() ).div( IsBash( sBash ).index() );
    }
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IERC20} from "./IERC20.sol";

interface IDai is IERC20 {
}

// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity 0.7.5;

import {IERC20} from "./interfaces/IERC20.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";

library FullMath {
    function fullMul(uint256 x, uint256 y)
        private
        pure
        returns (uint256 l, uint256 h)
    {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);
        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;
        require(h < d, "FullMath::mulDiv: overflow");
        return fullDiv(l, h, d);
    }
}

library Babylonian {
    function sqrt(uint256 x) internal pure returns (uint256) {
        if (x == 0) return 0;

        uint256 xx = x;
        uint256 r = 1;
        if (xx >= 0x100000000000000000000000000000000) {
            xx >>= 128;
            r <<= 64;
        }
        if (xx >= 0x10000000000000000) {
            xx >>= 64;
            r <<= 32;
        }
        if (xx >= 0x100000000) {
            xx >>= 32;
            r <<= 16;
        }
        if (xx >= 0x10000) {
            xx >>= 16;
            r <<= 8;
        }
        if (xx >= 0x100) {
            xx >>= 8;
            r <<= 4;
        }
        if (xx >= 0x10) {
            xx >>= 4;
            r <<= 2;
        }
        if (xx >= 0x8) {
            r <<= 1;
        }
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1;
        r = (r + x / r) >> 1; // Seven iterations should be enough
        uint256 r1 = x / r;
        return (r < r1 ? r : r1);
    }
}

library BitMath {
    function mostSignificantBit(uint256 x) internal pure returns (uint8 r) {
        require(x > 0, "BitMath::mostSignificantBit: zero");

        if (x >= 0x100000000000000000000000000000000) {
            x >>= 128;
            r += 128;
        }
        if (x >= 0x10000000000000000) {
            x >>= 64;
            r += 64;
        }
        if (x >= 0x100000000) {
            x >>= 32;
            r += 32;
        }
        if (x >= 0x10000) {
            x >>= 16;
            r += 16;
        }
        if (x >= 0x100) {
            x >>= 8;
            r += 8;
        }
        if (x >= 0x10) {
            x >>= 4;
            r += 4;
        }
        if (x >= 0x4) {
            x >>= 2;
            r += 2;
        }
        if (x >= 0x2) r += 1;
    }
}

library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = 0x10000000000000000000000000000;
    uint256 private constant Q224 =
        0x100000000000000000000000000000000000000000000000000000000;
    uint256 private constant LOWER_MASK = 0xffffffffffffffffffffffffffff; // decimal of UQ*x112 (lower 112 bits)

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a uq112x112 into a uint with 18 decimals of precision
    function decode112with18(uq112x112 memory self)
        internal
        pure
        returns (uint256)
    {
        return uint256(self._x) / 5192296858534827;
    }

    function fraction(uint256 numerator, uint256 denominator)
        internal
        pure
        returns (uq112x112 memory)
    {
        require(denominator > 0, "FixedPoint::fraction: division by zero");
        if (numerator == 0) return FixedPoint.uq112x112(0);

        if (numerator <= uint144(-1)) {
            uint256 result = (numerator << RESOLUTION) / denominator;
            require(result <= uint224(-1), "FixedPoint::fraction: overflow");
            return uq112x112(uint224(result));
        } else {
            uint256 result = FullMath.mulDiv(numerator, Q112, denominator);
            require(result <= uint224(-1), "FixedPoint::fraction: overflow");
            return uq112x112(uint224(result));
        }
    }

    // square root of a UQ112x112
    // lossy between 0/1 and 40 bits
    function sqrt(uq112x112 memory self)
        internal
        pure
        returns (uq112x112 memory)
    {
        if (self._x <= uint144(-1)) {
            return uq112x112(uint224(Babylonian.sqrt(uint256(self._x) << 112)));
        }

        uint8 safeShiftBits = 255 - BitMath.mostSignificantBit(self._x);
        safeShiftBits -= safeShiftBits % 2;
        return
            uq112x112(
                uint224(
                    Babylonian.sqrt(uint256(self._x) << safeShiftBits) <<
                        ((112 - safeShiftBits) / 2)
                )
            );
    }
}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function sqrrt(uint256 a) internal pure returns (uint256 c) {
        if (a > 3) {
            c = a;
            uint256 b = add(div(a, 2), 1);
            while (b < c) {
                c = b;
                b = div(add(div(a, b), b), 2);
            }
        } else if (a != 0) {
            c = 1;
        }
    }
}

interface IUniswapV2ERC20 {
    function totalSupply() external view returns (uint256);
}

interface IBondingCalculator {
    function valuation(address pair_, uint256 amount_)
        external
        view
        returns (uint256 _value);
}

contract ATBASHBondingCalculator is IBondingCalculator {
    using FixedPoint for *;
    using SafeMath for uint256;
    using SafeMath for uint112;

    address public immutable Bash;

    constructor(address _Bash) {
        require(_Bash != address(0));
        Bash = _Bash;
    }

    function getKValue(address _pair) public view returns (uint256 k_) {
        uint256 token0 = IERC20(IUniswapV2Pair(_pair).token0()).decimals();
        uint256 token1 = IERC20(IUniswapV2Pair(_pair).token1()).decimals();
        uint256 decimals = token0.add(token1).sub(IERC20(_pair).decimals());

        (uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(_pair)
            .getReserves();
        k_ = reserve0.mul(reserve1).div(10**decimals);
    }

    function getTotalValue(address _pair) public view returns (uint256 _value) {
        _value = getKValue(_pair).sqrrt().mul(2);
    }

    function valuation(address _pair, uint256 amount_)
        external
        view
        override
        returns (uint256 _value)
    {
        uint256 totalValue = getTotalValue(_pair);
        uint256 totalSupply = IUniswapV2Pair(_pair).totalSupply();

        _value = totalValue
            .mul(FixedPoint.fraction(amount_, totalSupply).decode112with18())
            .div(1e18);
    }

    function markdown(address _pair) external view returns (uint256) {
        (uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(_pair)
            .getReserves();
        require(
            IUniswapV2Pair(_pair).token0() == Bash ||
                IUniswapV2Pair(_pair).token1() == Bash,
            "Pair missing Bash"
        );

        uint256 reserve;
        if (IUniswapV2Pair(_pair).token0() == Bash) {
            reserve = reserve1;
        } else {
            reserve = reserve0;
        }
        return
            reserve.mul(2 * (10**IERC20(Bash).decimals())).div(getTotalValue(_pair));
    }
}

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"_burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account_","type":"address"},{"internalType":"uint256","name":"amount_","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"vault_","type":"address"}],"name":"setVault","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner_","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vault","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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