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// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract TREE is ERC20("tree.finance", "TREE"), Ownable {
  /**
    @notice the TREERebaser contract
   */
  address public rebaser;
  /**
    @notice the TREEReserve contract
   */
  address public reserve;

  function initContracts(address _rebaser, address _reserve)
    external
    onlyOwner
  {
    require(_rebaser != address(0), "TREE: invalid rebaser");
    require(rebaser == address(0), "TREE: rebaser already set");
    rebaser = _rebaser;
    require(_reserve != address(0), "TREE: invalid reserve");
    require(reserve == address(0), "TREE: reserve already set");
    reserve = _reserve;
  }

  function ownerMint(address account, uint256 amount) external onlyOwner {
    _mint(account, amount);
  }

  function rebaserMint(address account, uint256 amount) external {
    require(msg.sender == rebaser);
    _mint(account, amount);
  }

  function reserveBurn(address account, uint256 amount) external {
    require(msg.sender == reserve);
    _burn(account, amount);
  }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

interface IAMB {
  function messageSender() external view returns (address);
  function messageSourceChainId() external view returns (uint256);
  function messageId() external view returns (bytes32);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

interface IOmniBridge {
  /**
    @dev Initiate the bridge operation for some amount of tokens from msg.sender.
    The user should first call Approve method of the ERC677 token.
    @param token bridged token contract address.
    @param _receiver address that will receive the native tokens on the other network.
    @param _value amount of tokens to be transferred to the other network.
   */
  function relayTokens(
    address token,
    address _receiver,
    uint256 _value
  ) external;

  /**
    @dev Tells the expected token balance of the contract.
    @param _token address of token contract.
    @return the current tracked token balance of the contract.
   */
  function mediatorBalance(address _token) external view returns (uint256);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

interface ITREEOracle {
  function update() external returns (bool success);

  function consult(address token, uint256 amountIn)
    external
    view
    returns (uint256 amountOut);

  function updated() external view returns (bool);

  function updateAndConsult(address token, uint256 amountIn)
    external
    returns (uint256 amountOut);

  function blockTimestampLast() external view returns (uint32);

  function pair() external view returns (address);

  function token0() external view returns (address);

  function token1() external view returns (address);
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

interface ITREERewards {
  function notifyRewardAmount(uint256 reward) external;
}

pragma solidity 0.6.6;

/*
The MIT License (MIT)

Copyright (c) 2018 Murray Software, LLC.

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
//solhint-disable max-line-length
//solhint-disable no-inline-assembly

contract CloneFactory {

  function createClone(address target) internal returns (address result) {
    bytes20 targetBytes = bytes20(target);
    assembly {
      let clone := mload(0x40)
      mstore(clone, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000)
      mstore(add(clone, 0x14), targetBytes)
      mstore(add(clone, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)
      result := create(0, clone, 0x37)
    }
  }

  function isClone(address target, address query) internal view returns (bool result) {
    bytes20 targetBytes = bytes20(target);
    assembly {
      let clone := mload(0x40)
      mstore(clone, 0x363d3d373d3d3d363d7300000000000000000000000000000000000000000000)
      mstore(add(clone, 0xa), targetBytes)
      mstore(add(clone, 0x1e), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000)

      let other := add(clone, 0x40)
      extcodecopy(query, other, 0, 0x2d)
      result := and(
        eq(mload(clone), mload(other)),
        eq(mload(add(clone, 0xd)), mload(add(other, 0xd)))
      )
    }
  }
}

// COPIED FROM https://github.com/compound-finance/compound-protocol/blob/master/contracts/Timelock.sol
// Copyright 2020 Compound Labs, Inc.
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Modifications were made to support an IDChain/xDAI address as admin using the Arbitrary Message Bridge (AMB)
// Also did linting so it looks nicer

pragma solidity 0.6.6;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./interfaces/IAMB.sol";

contract Timelock {
  using SafeMath for uint256;

  modifier onlyAdmin(address admin_) {
    address actualSender = amb.messageSender();
    uint256 sourceL2ChainID = amb.messageSourceChainId();
    require(
      actualSender == admin_,
      "Timelock::onlyAdmin: L2 call must come from admin."
    );
    require(
      sourceL2ChainID == l2ChainID,
      "Timelock::onlyAdmin: L2 call must come from correct chain."
    );
    require(
      msg.sender == address(amb),
      "Timelock::onlyAdmin: L1 call must come from AMB."
    );
    _;
  }

  event NewAdmin(address indexed newAdmin);
  event NewPendingAdmin(address indexed newPendingAdmin);
  event NewDelay(uint256 indexed newDelay);
  event NewAMB(address indexed newAMB);
  event NewL2ChainID(uint256 indexed newL2ChainID);
  event CancelTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );
  event ExecuteTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );
  event QueueTransaction(
    bytes32 indexed txHash,
    address indexed target,
    uint256 value,
    string signature,
    bytes data,
    uint256 eta
  );

  uint256 public constant GRACE_PERIOD = 14 days;
  uint256 public constant MINIMUM_DELAY = 2 days;
  uint256 public constant MAXIMUM_DELAY = 30 days;

  address public admin;
  address public pendingAdmin;
  uint256 public delay;
  bool public admin_initialized;
  IAMB public amb;
  uint256 public l2ChainID;

  mapping(bytes32 => bool) public queuedTransactions;

  constructor(
    address admin_,
    uint256 delay_,
    address amb_,
    uint256 l2ChainID_
  ) public {
    require(
      delay_ >= MINIMUM_DELAY,
      "Timelock::constructor: Delay must exceed minimum delay."
    );
    require(
      delay_ <= MAXIMUM_DELAY,
      "Timelock::constructor: Delay must not exceed maximum delay."
    );

    admin = admin_;
    delay = delay_;
    admin_initialized = false;
    amb = IAMB(amb_);
    l2ChainID = l2ChainID_;
  }

  receive() external payable {}

  function setDelay(uint256 delay_) public {
    require(
      msg.sender == address(this),
      "Timelock::setDelay: Call must come from Timelock."
    );
    require(
      delay_ >= MINIMUM_DELAY,
      "Timelock::setDelay: Delay must exceed minimum delay."
    );
    require(
      delay_ <= MAXIMUM_DELAY,
      "Timelock::setDelay: Delay must not exceed maximum delay."
    );
    delay = delay_;

    emit NewDelay(delay_);
  }

  function setAMB(address amb_) public {
    require(
      msg.sender == address(this),
      "Timelock::setAMB: Call must come from Timelock."
    );
    require(amb_ != address(0), "Timelock::setAMB: AMB must be non zero.");
    amb = IAMB(amb_);

    emit NewAMB(amb_);
  }

  function setL2ChainID(uint256 l2ChainID_) public {
    require(
      msg.sender == address(this),
      "Timelock::setL2ChainID: Call must come from Timelock."
    );
    l2ChainID = l2ChainID_;

    emit NewL2ChainID(l2ChainID_);
  }

  function acceptAdmin() public onlyAdmin(pendingAdmin) {
    admin = pendingAdmin;
    pendingAdmin = address(0);

    emit NewAdmin(admin);
  }

  function setPendingAdmin(address pendingAdmin_) public {
    // allows one time setting of admin for deployment purposes
    if (admin_initialized) {
      require(
        msg.sender == address(this),
        "Timelock::setPendingAdmin: Call must come from Timelock."
      );
    } else {
      require(
        msg.sender == admin,
        "Timelock::setPendingAdmin: First call must come from admin."
      );
      admin_initialized = true;
    }
    pendingAdmin = pendingAdmin_;

    emit NewPendingAdmin(pendingAdmin_);
  }

  function queueTransaction(
    address target,
    uint256 value,
    string calldata signature,
    bytes calldata data,
    uint256 eta
  ) external onlyAdmin(admin) returns (bytes32) {
    require(
      eta >= getBlockTimestamp().add(delay),
      "Timelock::queueTransaction: Estimated execution block must satisfy delay."
    );

    bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
    queuedTransactions[txHash] = true;

    emit QueueTransaction(txHash, target, value, signature, data, eta);
    return txHash;
  }

  function cancelTransaction(
    address target,
    uint256 value,
    string calldata signature,
    bytes calldata data,
    uint256 eta
  ) external onlyAdmin(admin) {
    bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
    queuedTransactions[txHash] = false;

    emit CancelTransaction(txHash, target, value, signature, data, eta);
  }

  function executeTransaction(
    address target,
    uint256 value,
    string calldata signature,
    bytes calldata data,
    uint256 eta
  ) external payable onlyAdmin(admin) returns (bytes memory) {
    bytes32 txHash = keccak256(abi.encode(target, value, signature, data, eta));
    require(
      queuedTransactions[txHash],
      "Timelock::executeTransaction: Transaction hasn't been queued."
    );
    require(
      getBlockTimestamp() >= eta,
      "Timelock::executeTransaction: Transaction hasn't surpassed time lock."
    );
    require(
      getBlockTimestamp() <= eta.add(GRACE_PERIOD),
      "Timelock::executeTransaction: Transaction is stale."
    );

    queuedTransactions[txHash] = false;

    bool success;
    bytes memory returnData;
    if (bytes(signature).length == 0) {
      // solium-disable-next-line security/no-call-value
      (success, returnData) = target.call{ value: value }(data);
    } else {
      // solium-disable-next-line security/no-call-value
      (success, returnData) = target.call{ value: value }(
        abi.encodePacked(bytes4(keccak256(bytes(signature))), data)
      );
    }

    require(
      success,
      "Timelock::executeTransaction: Transaction execution reverted."
    );

    emit ExecuteTransaction(txHash, target, value, signature, data, eta);

    return returnData;
  }

  function getBlockTimestamp() internal view returns (uint256) {
    // solium-disable-next-line security/no-block-members
    return block.timestamp;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @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 Context, 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) public {
        _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(_msgSender(), 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(_msgSender(), 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, _msgSender(), _allowances[sender][_msgSender()].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(_msgSender(), spender, _allowances[_msgSender()][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(_msgSender(), spender, _allowances[_msgSender()][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 is 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 { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @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);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./TREE.sol";
import "./interfaces/ITREEOracle.sol";
import "./TREEReserve.sol";

contract TREERebaser is ReentrancyGuard {
  using SafeMath for uint256;

  /**
    Modifiers
   */

  modifier onlyGov {
    require(msg.sender == gov, "TREEReserve: not gov");
    _;
  }

  /**
    Events
   */
  event Rebase(uint256 treeSupplyChange);
  event SetGov(address _newValue);
  event SetOracle(address _newValue);
  event SetMinimumRebaseInterval(uint256 _newValue);
  event SetDeviationThreshold(uint256 _newValue);
  event SetRebaseMultiplier(uint256 _newValue);

  /**
    Public constants
   */
  /**
    @notice precision for decimal calculations
   */
  uint256 public constant PRECISION = 10**18;
  /**
    @notice the minimum value of minimumRebaseInterval
   */
  uint256 public constant MIN_MINIMUM_REBASE_INTERVAL = 12 hours;
  /**
    @notice the maximum value of minimumRebaseInterval
   */
  uint256 public constant MAX_MINIMUM_REBASE_INTERVAL = 14 days;
  /**
    @notice the minimum value of deviationThreshold
   */
  uint256 public constant MIN_DEVIATION_THRESHOLD = 10**16; // 1%
  /**
    @notice the maximum value of deviationThreshold
   */
  uint256 public constant MAX_DEVIATION_THRESHOLD = 10**17; // 10%
  /**
    @notice the minimum value of rebaseMultiplier
   */
  uint256 public constant MIN_REBASE_MULTIPLIER = 5 * 10**16; // 0.05x
  /**
    @notice the maximum value of rebaseMultiplier
   */
  uint256 public constant MAX_REBASE_MULTIPLIER = 10**19; // 10x

  /**
    System parameters
   */
  /**
    @notice the minimum interval between rebases, in seconds
   */
  uint256 public minimumRebaseInterval;
  /**
    @notice the threshold for the off peg percentage of TREE price above which rebase will occur
   */
  uint256 public deviationThreshold;
  /**
    @notice the multiplier for calculating how much TREE to mint during a rebase
   */
  uint256 public rebaseMultiplier;

  /**
    Public variables
   */
  /**
    @notice the timestamp of the last rebase
   */
  uint256 public lastRebaseTimestamp;
  /**
    @notice the address that has governance power over the reserve params
   */
  address public gov;

  /**
    External contracts
   */
  TREE public immutable tree;
  ITREEOracle public oracle;
  TREEReserve public immutable reserve;

  constructor(
    uint256 _minimumRebaseInterval,
    uint256 _deviationThreshold,
    uint256 _rebaseMultiplier,
    address _tree,
    address _oracle,
    address _reserve,
    address _gov
  ) public {
    minimumRebaseInterval = _minimumRebaseInterval;
    deviationThreshold = _deviationThreshold;
    rebaseMultiplier = _rebaseMultiplier;

    lastRebaseTimestamp = block.timestamp; // have a delay between deployment and the first rebase

    tree = TREE(_tree);
    oracle = ITREEOracle(_oracle);
    reserve = TREEReserve(_reserve);
    gov = _gov;
  }

  function rebase() external nonReentrant {
    // ensure the last rebase was not too recent
    require(
      block.timestamp > lastRebaseTimestamp.add(minimumRebaseInterval),
      "TREERebaser: last rebase too recent"
    );
    lastRebaseTimestamp = block.timestamp;

    // query TREE price from oracle
    uint256 treePrice = _treePrice();

    // check whether TREE price has deviated from the peg by a proportion over the threshold
    require(treePrice >= PRECISION && treePrice.sub(PRECISION) >= deviationThreshold, "TREERebaser: not off peg");

    // calculate off peg percentage and apply multiplier
    uint256 indexDelta = treePrice.sub(PRECISION).mul(rebaseMultiplier).div(PRECISION);

    // calculate the change in total supply
    uint256 treeSupply = tree.totalSupply();
    uint256 supplyChangeAmount = treeSupply.mul(indexDelta).div(PRECISION);

    // rebase TREE
    // mint TREE proportional to deviation
    // (1) mint TREE to reserve
    tree.rebaserMint(address(reserve), supplyChangeAmount);
    // (2) let reserve perform actions with the minted TREE
    reserve.handlePositiveRebase(supplyChangeAmount);

    // emit rebase event
    emit Rebase(supplyChangeAmount);
  }

  /**
    Utils
   */

  /**
   * @return price the price of TREE in reserve tokens
   */
  function _treePrice() internal returns (uint256 price) {
    bool updated = oracle.update();
    require(updated || oracle.updated(), "TREERebaser: oracle no price");
    return oracle.consult(address(tree), PRECISION);
  }

  /**
    Param setters
   */

  function setGov(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    gov = _newValue;
    emit SetGov(_newValue);
  }

  function setOracle(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    oracle = ITREEOracle(_newValue);
    emit SetOracle(_newValue);
  }

  function setMinimumRebaseInterval(uint256 _newValue) external onlyGov {
    require(
      _newValue >= MIN_MINIMUM_REBASE_INTERVAL &&
        _newValue <= MAX_MINIMUM_REBASE_INTERVAL,
      "TREERebaser: value out of range"
    );
    minimumRebaseInterval = _newValue;
    emit SetMinimumRebaseInterval(_newValue);
  }

  function setDeviationThreshold(uint256 _newValue) external onlyGov {
    require(
      _newValue >= MIN_DEVIATION_THRESHOLD &&
        _newValue <= MAX_DEVIATION_THRESHOLD,
      "TREERebaser: value out of range"
    );
    deviationThreshold = _newValue;
    emit SetDeviationThreshold(_newValue);
  }

  function setRebaseMultiplier(uint256 _newValue) external onlyGov {
    require(
      _newValue >= MIN_REBASE_MULTIPLIER && _newValue <= MAX_REBASE_MULTIPLIER,
      "TREERebaser: value out of range"
    );
    rebaseMultiplier = _newValue;
    emit SetRebaseMultiplier(_newValue);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/lib/contracts/libraries/Babylonian.sol";
import "./TREE.sol";
import "./TREERebaser.sol";
import "./interfaces/ITREERewards.sol";
import "./interfaces/IOmniBridge.sol";

contract TREEReserve is ReentrancyGuard, Ownable {
  using SafeMath for uint256;
  using SafeERC20 for ERC20;

  /**
    Modifiers
   */

  modifier onlyRebaser {
    require(msg.sender == address(rebaser), "TREEReserve: not rebaser");
    _;
  }

  modifier onlyGov {
    require(msg.sender == gov, "TREEReserve: not gov");
    _;
  }

  /**
    Events
   */
  event SellTREE(uint256 treeSold, uint256 reserveTokenReceived);
  event BurnTREE(
    address indexed sender,
    uint256 burnTreeAmount,
    uint256 receiveReserveTokenAmount
  );
  event SetGov(address _newValue);
  event SetCharity(address _newValue);
  event SetLPRewards(address _newValue);
  event SetUniswapPair(address _newValue);
  event SetUniswapRouter(address _newValue);
  event SetOmniBridge(address _newValue);
  event SetCharityCut(uint256 _newValue);
  event SetRewardsCut(uint256 _newValue);

  /**
    Public constants
   */
  /**
    @notice precision for decimal calculations
   */
  uint256 public constant PRECISION = 10**18;
  /**
    @notice Uniswap takes 0.3% fee, gamma = 1 - 0.3% = 99.7%
   */
  uint256 public constant UNISWAP_GAMMA = 997 * 10**15;
  /**
    @notice the minimum value of charityCut
   */
  uint256 public constant MIN_CHARITY_CUT = 10**17; // 10%
  /**
    @notice the maximum value of charityCut
   */
  uint256 public constant MAX_CHARITY_CUT = 5 * 10**17; // 50%
  /**
    @notice the minimum value of rewardsCut
   */
  uint256 public constant MIN_REWARDS_CUT = 5 * 10**15; // 0.5%
  /**
    @notice the maximum value of rewardsCut
   */
  uint256 public constant MAX_REWARDS_CUT = 10**17; // 10%

  /**
    System parameters
   */
  /**
    @notice the address that has governance power over the reserve params
   */
  address public gov;
  /**
    @notice the address that will store the TREE donation, NEEDS TO BE ON L2 CHAIN
   */
  address public charity;
  /**
    @notice the proportion of rebase income given to charity
   */
  uint256 public charityCut;
  /**
    @notice the proportion of rebase income given to LPRewards
   */
  uint256 public rewardsCut;

  /**
    External contracts
   */
  TREE public immutable tree;
  ERC20 public immutable reserveToken;
  TREERebaser public rebaser;
  ITREERewards public lpRewards;
  IUniswapV2Pair public uniswapPair;
  IUniswapV2Router02 public uniswapRouter;
  IOmniBridge public omniBridge;

  constructor(
    uint256 _charityCut,
    uint256 _rewardsCut,
    address _tree,
    address _gov,
    address _charity,
    address _reserveToken,
    address _lpRewards,
    address _uniswapPair,
    address _uniswapRouter,
    address _omniBridge
  ) public {
    charityCut = _charityCut;
    rewardsCut = _rewardsCut;

    tree = TREE(_tree);
    gov = _gov;
    charity = _charity;
    reserveToken = ERC20(_reserveToken);
    lpRewards = ITREERewards(_lpRewards);
    uniswapPair = IUniswapV2Pair(_uniswapPair);
    uniswapRouter = IUniswapV2Router02(_uniswapRouter);
    omniBridge = IOmniBridge(_omniBridge);
  }

  function initContracts(address _rebaser) external onlyOwner {
    require(_rebaser != address(0), "TREE: invalid rebaser");
    require(address(rebaser) == address(0), "TREE: rebaser already set");
    rebaser = TREERebaser(_rebaser);
  }

  /**
    @notice distribute minted TREE to TREERewards and TREEGov, and sell the rest
    @param mintedTREEAmount the amount of TREE minted
   */
  function handlePositiveRebase(uint256 mintedTREEAmount)
    external
    onlyRebaser
    nonReentrant
  {
    // sell remaining TREE for reserveToken
    uint256 rewardsCutAmount = mintedTREEAmount.mul(rewardsCut).div(PRECISION);
    uint256 remainingTREEAmount = mintedTREEAmount.sub(rewardsCutAmount);
    (uint256 treeSold, uint256 reserveTokenReceived) = _sellTREE(
      remainingTREEAmount
    );

    // handle unsold TREE
    if (treeSold < remainingTREEAmount) {
      // the TREE going to rewards should be decreased if there's unsold TREE
      // to maintain the ratio between charityCut and rewardsCut
      uint256 newRewardsCutAmount = rewardsCutAmount.mul(treeSold).div(remainingTREEAmount);
      uint256 burnAmount = remainingTREEAmount.sub(treeSold).add(rewardsCutAmount).sub(newRewardsCutAmount);
      rewardsCutAmount = newRewardsCutAmount;

      // burn unsold TREE
      tree.reserveBurn(address(this), burnAmount);
    }

    // send reserveToken to charity
    uint256 charityCutAmount = reserveTokenReceived.mul(charityCut).div(
      PRECISION.sub(rewardsCut)
    );
    reserveToken.safeIncreaseAllowance(address(omniBridge), charityCutAmount);
    omniBridge.relayTokens(address(reserveToken), charity, charityCutAmount);

    // send TREE to TREERewards
    tree.transfer(address(lpRewards), rewardsCutAmount);
    lpRewards.notifyRewardAmount(rewardsCutAmount);

    // emit event
    emit SellTREE(treeSold, reserveTokenReceived);
  }

  function burnTREE(uint256 amount) external nonReentrant {
    require(!Address.isContract(msg.sender), "TREEReserve: not EOA");

    uint256 treeSupply = tree.totalSupply();

    // burn TREE for msg.sender
    tree.reserveBurn(msg.sender, amount);

    // give reserveToken to msg.sender based on quadratic shares
    uint256 reserveTokenBalance = reserveToken.balanceOf(address(this));
    uint256 deserveAmount = reserveTokenBalance.mul(amount.mul(amount)).div(
      treeSupply.mul(treeSupply)
    );
    reserveToken.safeTransfer(msg.sender, deserveAmount);

    // emit event
    emit BurnTREE(msg.sender, amount, deserveAmount);
  }

  /**
    Utilities
   */
  /**
    @notice create a sell order for TREE
    @param amount the amount of TREE to sell
    @return treeSold the amount of TREE sold
            reserveTokenReceived the amount of reserve tokens received
   */
  function _sellTREE(uint256 amount)
    internal
    returns (uint256 treeSold, uint256 reserveTokenReceived)
  {
    (uint256 token0Reserves, uint256 token1Reserves, ) = uniswapPair
      .getReserves();
    // the max amount of TREE that can be sold such that
    // the price doesn't go below the peg
    uint256 maxSellAmount = _uniswapMaxSellAmount(
      token0Reserves,
      token1Reserves
    );
    treeSold = amount > maxSellAmount ? maxSellAmount : amount;
    tree.increaseAllowance(address(uniswapRouter), treeSold);
    address[] memory path = new address[](2);
    path[0] = address(tree);
    path[1] = address(reserveToken);
    uint256[] memory amounts = uniswapRouter.swapExactTokensForTokens(
      treeSold,
      1,
      path,
      address(this),
      block.timestamp
    );
    reserveTokenReceived = amounts[1];
  }

  function _uniswapMaxSellAmount(uint256 token0Reserves, uint256 token1Reserves)
    internal
    view
    returns (uint256 result)
  {
    // the max amount of TREE we can sell brings the price down to the peg
    // maxSellAmount = (sqrt(R_tree * R_reserveToken) - R_tree) / UNISWAP_GAMMA
    result = Babylonian.sqrt(token0Reserves.mul(token1Reserves));
    if (address(tree) < address(reserveToken)) {
      // TREE is token0 of the Uniswap pair
      result = result.sub(token0Reserves);
    } else {
      // TREE is token1 of the Uniswap pair
      result = result.sub(token1Reserves);
    }
    result = result.mul(PRECISION).div(UNISWAP_GAMMA);
  }

  /**
    Param setters
   */
  function setGov(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    gov = _newValue;
    emit SetGov(_newValue);
  }

  function setCharity(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    charity = _newValue;
    emit SetCharity(_newValue);
  }

  function setLPRewards(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    lpRewards = ITREERewards(_newValue);
    emit SetLPRewards(_newValue);
  }

  function setUniswapPair(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    uniswapPair = IUniswapV2Pair(_newValue);
    emit SetUniswapPair(_newValue);
  }

  function setUniswapRouter(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    uniswapRouter = IUniswapV2Router02(_newValue);
    emit SetUniswapRouter(_newValue);
  }

  function setOmniBridge(address _newValue) external onlyGov {
    require(_newValue != address(0), "TREEReserve: address is 0");
    omniBridge = IOmniBridge(_newValue);
    emit SetOmniBridge(_newValue);
  }

  function setCharityCut(uint256 _newValue) external onlyGov {
    require(
      _newValue >= MIN_CHARITY_CUT && _newValue <= MAX_CHARITY_CUT,
      "TREEReserve: value out of range"
    );
    charityCut = _newValue;
    emit SetCharityCut(_newValue);
  }

  function setRewardsCut(uint256 _newValue) external onlyGov {
    require(
      _newValue >= MIN_REWARDS_CUT && _newValue <= MAX_REWARDS_CUT,
      "TREEReserve: value out of range"
    );
    rewardsCut = _newValue;
    emit SetRewardsCut(_newValue);
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @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");
        }
    }
}

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;
}

pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

// computes square roots using the babylonian method
// https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
library Babylonian {
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
        // else z = 0
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

/*
   ____            __   __        __   _
  / __/__ __ ___  / /_ / /  ___  / /_ (_)__ __
 _\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
     /___/

* Synthetix: TREERewards.sol
*
* Docs: https://docs.synthetix.io/
*
*
* MIT License
* ===========
*
* Copyright (c) 2020 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, TREEAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/

import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
  function _msgSender() internal virtual view returns (address payable) {
    return msg.sender;
  }

  function _msgData() internal virtual view returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
  address private _owner;

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

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  constructor() internal {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(_owner == _msgSender(), "Ownable: caller is not the owner");
    _;
  }

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() public virtual onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) public virtual onlyOwner {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called internally.
   */
  function _transferOwnership(address newOwner) internal virtual {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

abstract contract IRewardDistributionRecipient is Ownable {
  address public rewardDistribution;

  function notifyRewardAmount(uint256 reward) external virtual;

  modifier onlyRewardDistribution() {
    require(
      _msgSender() == rewardDistribution,
      "Caller is not reward distribution"
    );
    _;
  }

  function setRewardDistribution(address _rewardDistribution)
    external
    onlyOwner
  {
    require(_rewardDistribution != address(0), "0 input");
    rewardDistribution = _rewardDistribution;
  }
}

contract LPTokenWrapper {
  using SafeMath for uint256;
  using SafeERC20 for IERC20;

  IERC20 public stakeToken;

  uint256 private _totalSupply;
  mapping(address => uint256) private _balances;

  function _initStakeToken(address _stakeToken) internal {
    stakeToken = IERC20(_stakeToken);
  }

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

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

  function stake(uint256 amount) public virtual {
    _totalSupply = _totalSupply.add(amount);
    _balances[msg.sender] = _balances[msg.sender].add(amount);
    stakeToken.safeTransferFrom(msg.sender, address(this), amount);
  }

  function withdraw(uint256 amount) public virtual {
    _totalSupply = _totalSupply.sub(amount);
    _balances[msg.sender] = _balances[msg.sender].sub(amount);
    stakeToken.safeTransfer(msg.sender, amount);
  }
}

contract TREERewards is LPTokenWrapper, IRewardDistributionRecipient {
  IERC20 public rewardToken;
  uint256 public constant DURATION = 7 days;
  uint256 public constant PRECISION = 10**18;

  uint256 public starttime;
  uint256 public periodFinish = 0;
  uint256 public rewardRate = 0;
  uint256 public lastUpdateTime;
  uint256 public rewardPerTokenStored;
  mapping(address => uint256) public userRewardPerTokenPaid;
  mapping(address => uint256) public rewards;
  bool public initialized;

  event RewardAdded(uint256 reward);
  event Staked(address indexed user, uint256 amount);
  event Withdrawn(address indexed user, uint256 amount);
  event RewardPaid(address indexed user, uint256 reward);

  modifier checkStart() {
    require(block.timestamp >= starttime, "not start");
    _;
  }

  modifier updateReward(address account) {
    rewardPerTokenStored = rewardPerToken();
    lastUpdateTime = lastTimeRewardApplicable();
    if (account != address(0)) {
      rewards[account] = earned(account);
      userRewardPerTokenPaid[account] = rewardPerTokenStored;
    }
    _;
  }

  function init(
    address _sender,
    uint256 _starttime,
    address _stakeToken,
    address _rewardToken
  ) public {
    require(!initialized, "Initialized");
    initialized = true;
    starttime = _starttime;
    rewardToken = IERC20(_rewardToken);
    _initStakeToken(_stakeToken);
    _transferOwnership(_sender);
  }

  function lastTimeRewardApplicable() public view returns (uint256) {
    return Math.min(block.timestamp, periodFinish);
  }

  function rewardPerToken() public view returns (uint256) {
    if (totalSupply() == 0) {
      return rewardPerTokenStored;
    }
    return
      rewardPerTokenStored.add(
        lastTimeRewardApplicable()
          .sub(lastUpdateTime)
          .mul(rewardRate)
          .mul(PRECISION)
          .div(totalSupply())
      );
  }

  function earned(address account) public view returns (uint256) {
    return
      balanceOf(account)
        .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
        .div(PRECISION)
        .add(rewards[account]);
  }

  // stake visibility is public as overriding LPTokenWrapper's stake() function
  function stake(uint256 amount)
    public
    override
    updateReward(msg.sender)
    checkStart
  {
    require(amount > 0, "Cannot stake 0");
    super.stake(amount);
    emit Staked(msg.sender, amount);
  }

  function withdraw(uint256 amount)
    public
    override
    updateReward(msg.sender)
    checkStart
  {
    require(amount > 0, "Cannot withdraw 0");
    super.withdraw(amount);
    emit Withdrawn(msg.sender, amount);
  }

  function exit() external {
    withdraw(balanceOf(msg.sender));
    getReward();
  }

  function getReward() public updateReward(msg.sender) checkStart {
    uint256 reward = earned(msg.sender);
    if (reward > 0) {
      rewards[msg.sender] = 0;
      rewardToken.safeTransfer(msg.sender, reward);
      emit RewardPaid(msg.sender, reward);
    }
  }

  function notifyRewardAmount(uint256 reward)
    external
    override
    onlyRewardDistribution
    updateReward(address(0))
  {
    if (block.timestamp > starttime) {
      if (block.timestamp >= periodFinish) {
        rewardRate = reward.div(DURATION);
      } else {
        uint256 remaining = periodFinish.sub(block.timestamp);
        uint256 leftover = remaining.mul(rewardRate);
        rewardRate = reward.add(leftover).div(DURATION);
      }
      lastUpdateTime = block.timestamp;
      periodFinish = block.timestamp.add(DURATION);
      emit RewardAdded(reward);
    } else {
      rewardRate = reward.div(DURATION);
      lastUpdateTime = starttime;
      periodFinish = starttime.add(DURATION);
      emit RewardAdded(reward);
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    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);
    }
}

pragma solidity 0.6.6;

import "./TREERewards.sol";
import "./libraries/CloneFactory.sol";

contract TREERewardsFactory is CloneFactory {
  address public immutable template;

  event CreateRewards(address _rewards);

  constructor(address _template) public {
    template = _template;
  }

  function createRewards(
    uint256 _starttime,
    address _stakeToken,
    address _rewardToken
  ) external returns (TREERewards) {
    TREERewards rewards = TREERewards(createClone(template));
    rewards.init(msg.sender, _starttime, _stakeToken, _rewardToken);
    emit CreateRewards(address(rewards));
    return rewards;
  }
}

// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity 0.6.6;

import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol";
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
import "@uniswap/lib/contracts/libraries/FixedPoint.sol";
import "@uniswap/v2-periphery/contracts/libraries/UniswapV2OracleLibrary.sol";
import "@uniswap/v2-periphery/contracts/libraries/UniswapV2Library.sol";

// fixed window oracle that recomputes the average price for the entire period once every period
// note that the price average is only guaranteed to be over at least 1 period, but may be over a longer period
contract UniswapOracle {
  using FixedPoint for *;

  uint256 public PERIOD;

  IUniswapV2Pair public immutable pair;
  address public immutable token0;
  address public immutable token1;

  uint256 public price0CumulativeLast;
  uint256 public price1CumulativeLast;
  uint32 public blockTimestampLast;
  FixedPoint.uq112x112 public price0Average;
  FixedPoint.uq112x112 public price1Average;
  bool public initialized;
  bool public updated;

  constructor(
    address factory,
    address tokenA,
    address tokenB,
    uint256 period
  ) public {
    IUniswapV2Pair _pair = IUniswapV2Pair(
      UniswapV2Library.pairFor(factory, tokenA, tokenB)
    );
    pair = _pair;
    token0 = _pair.token0();
    token1 = _pair.token1();
    PERIOD = period;
  }

  function init() external {
    require(!initialized, "UniswapOracle: INITIALIZED");
    initialized = true;
    price0CumulativeLast = pair.price0CumulativeLast(); // fetch the current accumulated price value (1 / 0)
    price1CumulativeLast = pair.price1CumulativeLast(); // fetch the current accumulated price value (0 / 1)
    uint112 reserve0;
    uint112 reserve1;
    (reserve0, reserve1, blockTimestampLast) = pair.getReserves();
    require(reserve0 != 0 && reserve1 != 0, "UniswapOracle: NO_RESERVES"); // ensure that there's liquidity in the pair
  }

  function update() external returns (bool success) {
    require(initialized, "UniswapOracle: NOT_INITIALIZED");
    (
      uint256 price0Cumulative,
      uint256 price1Cumulative,
      uint32 blockTimestamp
    ) = UniswapV2OracleLibrary.currentCumulativePrices(address(pair));

    uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
    // ensure that at least one full period has passed since the last update
    if (timeElapsed < PERIOD) {
      return false;
    }

    // overflow is desired, casting never truncates
    // cumulative price is in (uq112x112 price * seconds) units so we simply wrap it after division by time elapsed
    price0Average = FixedPoint.uq112x112(
      uint224((price0Cumulative - price0CumulativeLast) / timeElapsed)
    );
    price1Average = FixedPoint.uq112x112(
      uint224((price1Cumulative - price1CumulativeLast) / timeElapsed)
    );

    price0CumulativeLast = price0Cumulative;
    price1CumulativeLast = price1Cumulative;
    blockTimestampLast = blockTimestamp;
    updated = true;

    return true;
  }

  // note this will always return 0 before update has been called successfully for the first time.
  function consult(address token, uint256 amountIn)
    external
    view
    returns (uint256 amountOut)
  {
    if (token == token0) {
      amountOut = price0Average.mul(amountIn).decode144();
    } else {
      require(token == token1, "UniswapOracle: INVALID_TOKEN");
      amountOut = price1Average.mul(amountIn).decode144();
    }
  }

  // used in frontend for checking the latest price
  function updateAndConsult(address token, uint256 amountIn)
    external
    returns (uint256 amountOut)
  {
    this.update();
    return this.consult(token, amountIn);
  }
}

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.4.0;

import './Babylonian.sol';

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
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 {
        uint _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint private constant Q112 = uint(1) << RESOLUTION;
    uint private constant Q224 = Q112 << RESOLUTION;

    // encode a uint112 as a UQ112x112
    function encode(uint112 x) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(x) << RESOLUTION);
    }

    // encodes a uint144 as a UQ144x112
    function encode144(uint144 x) internal pure returns (uq144x112 memory) {
        return uq144x112(uint256(x) << RESOLUTION);
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
        require(x != 0, 'FixedPoint: DIV_BY_ZERO');
        return uq112x112(self._x / uint224(x));
    }

    // multiply a UQ112x112 by a uint, returning a UQ144x112
    // reverts on overflow
    function mul(uq112x112 memory self, uint y) internal pure returns (uq144x112 memory) {
        uint z;
        require(y == 0 || (z = uint(self._x) * y) / y == uint(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
        return uq144x112(z);
    }

    // returns a UQ112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
    }

    // 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 UQ144x112 into a uint144 by truncating after the radix point
    function decode144(uq144x112 memory self) internal pure returns (uint144) {
        return uint144(self._x >> RESOLUTION);
    }

    // take the reciprocal of a UQ112x112
    function reciprocal(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        require(self._x != 0, 'FixedPoint: ZERO_RECIPROCAL');
        return uq112x112(uint224(Q224 / self._x));
    }

    // square root of a UQ112x112
    function sqrt(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(Babylonian.sqrt(uint256(self._x)) << 56));
    }
}

pragma solidity >=0.5.0;

import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';
import '@uniswap/lib/contracts/libraries/FixedPoint.sol';

// library with helper methods for oracles that are concerned with computing average prices
library UniswapV2OracleLibrary {
    using FixedPoint for *;

    // helper function that returns the current block timestamp within the range of uint32, i.e. [0, 2**32 - 1]
    function currentBlockTimestamp() internal view returns (uint32) {
        return uint32(block.timestamp % 2 ** 32);
    }

    // produces the cumulative price using counterfactuals to save gas and avoid a call to sync.
    function currentCumulativePrices(
        address pair
    ) internal view returns (uint price0Cumulative, uint price1Cumulative, uint32 blockTimestamp) {
        blockTimestamp = currentBlockTimestamp();
        price0Cumulative = IUniswapV2Pair(pair).price0CumulativeLast();
        price1Cumulative = IUniswapV2Pair(pair).price1CumulativeLast();

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast) = IUniswapV2Pair(pair).getReserves();
        if (blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint32 timeElapsed = blockTimestamp - blockTimestampLast;
            // addition overflow is desired
            // counterfactual
            price0Cumulative += uint(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
            // counterfactual
            price1Cumulative += uint(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
        }
    }
}

pragma solidity >=0.5.0;

import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol';

import "./SafeMath.sol";

library UniswapV2Library {
    using SafeMath for uint;

    // returns sorted token addresses, used to handle return values from pairs sorted in this order
    function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
        require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
        (token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
    }

    // calculates the CREATE2 address for a pair without making any external calls
    function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
        (address token0, address token1) = sortTokens(tokenA, tokenB);
        pair = address(uint(keccak256(abi.encodePacked(
                hex'ff',
                factory,
                keccak256(abi.encodePacked(token0, token1)),
                hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
            ))));
    }

    // fetches and sorts the reserves for a pair
    function getReserves(address factory, address tokenA, address tokenB) internal view returns (uint reserveA, uint reserveB) {
        (address token0,) = sortTokens(tokenA, tokenB);
        (uint reserve0, uint reserve1,) = IUniswapV2Pair(pairFor(factory, tokenA, tokenB)).getReserves();
        (reserveA, reserveB) = tokenA == token0 ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    // given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
    function quote(uint amountA, uint reserveA, uint reserveB) internal pure returns (uint amountB) {
        require(amountA > 0, 'UniswapV2Library: INSUFFICIENT_AMOUNT');
        require(reserveA > 0 && reserveB > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        amountB = amountA.mul(reserveB) / reserveA;
    }

    // given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint amountOut) {
        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint amountInWithFee = amountIn.mul(997);
        uint numerator = amountInWithFee.mul(reserveOut);
        uint denominator = reserveIn.mul(1000).add(amountInWithFee);
        amountOut = numerator / denominator;
    }

    // given an output amount of an asset and pair reserves, returns a required input amount of the other asset
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) internal pure returns (uint amountIn) {
        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
        require(reserveIn > 0 && reserveOut > 0, 'UniswapV2Library: INSUFFICIENT_LIQUIDITY');
        uint numerator = reserveIn.mul(amountOut).mul(1000);
        uint denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(address factory, uint amountIn, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[0] = amountIn;
        for (uint i; i < path.length - 1; i++) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i], path[i + 1]);
            amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
        }
    }

    // performs chained getAmountIn calculations on any number of pairs
    function getAmountsIn(address factory, uint amountOut, address[] memory path) internal view returns (uint[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint i = path.length - 1; i > 0; i--) {
            (uint reserveIn, uint reserveOut) = getReserves(factory, path[i - 1], path[i]);
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
}

pragma solidity =0.6.6;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}

{
  "metadata": {
    "useLiteralContent": false
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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