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pragma solidity ^0.6.0;

import "@openzeppelin/contracts/token/ERC721/ERC721Burnable.sol";
import './owner/Operator.sol';

pragma solidity ^0.6.0;

contract HayekPlate is ERC721Burnable, Operator {
    using SafeMath for uint256;
    address public nftFeature;

    event FeatureAddrChanged(address indexed oldFeatureAddr, address indexed newFeatureAddr);
    event AirdropIssuerChanged(address indexed oldAirdropIssuer, address indexed newAirdropIssuer);
    event CoreProtocolChanged(address indexed oldCoreProtocol, address indexed newCoreProtocol);

    address public airdropIssuer;
    address public coreProtocol;

    constructor (address _nftFeature) public ERC721("Hayek-Money-NFT", "HayekNFT") {
        nftFeature = _nftFeature;
    }

    modifier onlyAirdropIssuer() {
        require(msg.sender == airdropIssuer, "Not airdropIssuer");
        _;
    }

    modifier onlyCoreProtocol() {
        require(msg.sender == coreProtocol, "Not coreProtocol");
        _;
    }

    function setAirdropIssuer(address _airdropIssuer) public onlyOperator {
        address oldAirdropIssuer = _airdropIssuer;
        airdropIssuer = _airdropIssuer;
        emit AirdropIssuerChanged(oldAirdropIssuer, airdropIssuer);
    }

    function setCoreProtocol(address _coreProtocol) public onlyOperator {
        address oldCoreProtocol = coreProtocol;
        coreProtocol = _coreProtocol;
        emit CoreProtocolChanged(oldCoreProtocol, coreProtocol);
    }

    function getOwnerAllNFT(address account) public view returns(uint256[] memory) {
        uint256 length = balanceOf(account);
        uint256[] memory allNFT = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            allNFT[i] = tokenOfOwnerByIndex(account, i);
        }
        return allNFT;
    }

    function setFeatureAddr(address _nftFeature) public onlyOperator {
        address oldNFTFeature = nftFeature;
        nftFeature = _nftFeature;
        emit FeatureAddrChanged(oldNFTFeature, nftFeature);
    }

    function getFeatureAddr() public view returns(address) {
        return nftFeature;
    }

    function setBaseURI(string memory baseURI_) public onlyOperator {
        _setBaseURI(baseURI_);
    }

    function setTokenURI(uint256 tokenId, string memory _tokenURI) public onlyOperator {
        _setTokenURI(tokenId, _tokenURI);
    }

    function mint(address to, uint256 tokenId)
        public
        onlyOperator
    {
        _mint(to, tokenId);
    }

    function merge(address to, uint256 tokenId)
        public
        onlyCoreProtocol
    {
        _mint(to, tokenId);
    }

    function issueAirdrop(address to, uint256 tokenId)
        public
        onlyAirdropIssuer
    {
        _mint(to, tokenId);
    }

    function transfer(address to, uint256 tokenId)
        public
    {
        safeTransferFrom(msg.sender, to, tokenId);
    }

    function batchTransfer(address to, uint256[] memory tokenId)
        public
    {
        for (uint256 i = 0; i < tokenId.length; i++) {
            safeTransferFrom(msg.sender, to, tokenId[i]);
        }
    }
}

pragma solidity ^0.6.0;
//pragma experimental ABIEncoderV2;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

import './lib/Safe112.sol';
import './owner/Operator.sol';
import './utils/ContractGuard.sol';
import './interfaces/IHCAsset.sol';

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

    IERC20 public share;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }
    
    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) public virtual {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        share.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) public virtual {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        share.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract Boardroom is ShareWrapper, HayekPlateWrapper, ContractGuard, Operator {
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;
    using Safe112 for uint112;

    /* ========== DATA STRUCTURES ========== */

    struct Boardseat {
        uint256 lastSnapshotIndex;
        uint256 rewardEarned;
    }

    struct BoardSnapshot {
        uint256 time;
        uint256 rewardReceived;
        uint256 rewardPerShare;
    }

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

    IERC20 private cash;

    mapping(address => Boardseat) private directors;
    BoardSnapshot[] private boardHistory;

    /* ========== CONSTRUCTOR ========== */

    constructor(IERC20 _cash, IHayekPlate _hayekPlate, IERC20 _share) public {
        cash = _cash;
        share = _share;
        hayekPlate = _hayekPlate;
        BoardSnapshot memory genesisSnapshot =
            BoardSnapshot({
                time: block.number,
                rewardReceived: 0,
                rewardPerShare: 0
            });
        boardHistory.push(genesisSnapshot);
    }

    /* ========== Modifiers =============== */
    modifier directorExists {
        require(
            balanceOf(msg.sender) > 0,
            'Boardroom: The director does not exist'
        );
        _;
    }

    modifier updateReward(address director) {
        if (director != address(0)) {
            Boardseat memory seat = directors[director];
            seat.rewardEarned = earned(director);
            seat.lastSnapshotIndex = latestSnapshotIndex();
            directors[director] = seat;
        }
        _;
    }

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

    // =========== Snapshot getters

    function latestSnapshotIndex() public view returns (uint256) {
        return boardHistory.length.sub(1);
    }

    function getLatestSnapshot() internal view returns (BoardSnapshot memory) {
        return boardHistory[latestSnapshotIndex()];
    }

    function getLastSnapshotIndexOf(address director)
        public
        view
        returns (uint256)
    {
        return directors[director].lastSnapshotIndex;
    }

    function getLastSnapshotOf(address director)
        internal
        view
        returns (BoardSnapshot memory)
    {
        return boardHistory[getLastSnapshotIndexOf(director)];
    }

    // =========== Director getters

    function rewardPerShare() public view returns (uint256) {
        return getLatestSnapshot().rewardPerShare;
    }

    function earned(address director) public view returns (uint256) {
        uint256 latestRPS = getLatestSnapshot().rewardPerShare;
        uint256 storedRPS = getLastSnapshotOf(director).rewardPerShare;

        return
            internalBalanceOf(director).mul(latestRPS.sub(storedRPS)).div(1e18).add(
                directors[director].rewardEarned
            );
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function stakePlate(uint256 tokenId) 
        public
        override
        onlyOneBlock
        updateReward(msg.sender)
    {
        require(tokenId > 0, 'HCCUNIPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        onlyOneBlock
        updateReward(msg.sender)
    {
        require(tokenId > 0, 'HCCUNIPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    function stake(uint256 amount)
        public
        onlyOneBlock
        updateReward(msg.sender)
    {
        require(amount > 0, 'Boardroom: Cannot stake 0');
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        onlyOneBlock
        directorExists
        updateReward(msg.sender)
    {
        require(amount > 0, 'Boardroom: Cannot withdraw 0');
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        emit Withdrawn(msg.sender, amount);
    }

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

    function claimReward() public updateReward(msg.sender) {
        uint256 reward = directors[msg.sender].rewardEarned;
        if (reward > 0) {
            directors[msg.sender].rewardEarned = 0;
            cash.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    function allocateSeigniorage(uint256 amount)
        external
        onlyOneBlock
        onlyOperator
    {
        require(amount > 0, 'Boardroom: Cannot allocate 0');
        require(
            totalSupply() > 0,
            'Boardroom: Cannot allocate when totalSupply is 0'
        );

        // Create & add new snapshot
        uint256 prevRPS = getLatestSnapshot().rewardPerShare;
        uint256 nextRPS = prevRPS.add(amount.mul(1e18).div(totalInternalSupply()));

        BoardSnapshot memory newSnapshot =
            BoardSnapshot({
                time: block.number,
                rewardReceived: amount,
                rewardPerShare: nextRPS
            });
        boardHistory.push(newSnapshot);

        cash.safeTransferFrom(msg.sender, address(this), amount);
        emit RewardAdded(msg.sender, amount);
    }

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

    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event PlateStaked(address indexed user, uint256 tokenId);
    event PlateWithdrawn(address indexed user, uint256 tokenId);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardAdded(address indexed user, uint256 reward);
}

// 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 ^0.6.0;

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 ^0.6.0;

library Safe112 {
    function add(uint112 a, uint112 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, 'Safe112: addition overflow');

        return c;
    }

    function sub(uint112 a, uint112 b) internal pure returns (uint256) {
        return sub(a, b, 'Safe112: subtraction overflow');
    }

    function sub(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        require(b <= a, errorMessage);
        uint112 c = a - b;

        return c;
    }

    function mul(uint112 a, uint112 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, 'Safe112: multiplication overflow');

        return c;
    }

    function div(uint112 a, uint112 b) internal pure returns (uint256) {
        return div(a, b, 'Safe112: division by zero');
    }

    function div(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint112 c = a / b;

        return c;
    }

    function mod(uint112 a, uint112 b) internal pure returns (uint256) {
        return mod(a, b, 'Safe112: modulo by zero');
    }

    function mod(
        uint112 a,
        uint112 b,
        string memory errorMessage
    ) internal pure returns (uint112) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/GSN/Context.sol';
import '@openzeppelin/contracts/access/Ownable.sol';

contract Operator is Context, Ownable {
    address private _operator;

    event OperatorTransferred(
        address indexed previousOperator,
        address indexed newOperator
    );

    constructor() internal {
        _operator = _msgSender();
        emit OperatorTransferred(address(0), _operator);
    }

    function operator() public view returns (address) {
        return _operator;
    }

    modifier onlyOperator() {
        require(
            _operator == msg.sender,
            'operator: caller is not the operator'
        );
        _;
    }

    function isOperator() public view returns (bool) {
        return _msgSender() == _operator;
    }

    function transferOperator(address newOperator_) public onlyOwner {
        _transferOperator(newOperator_);
    }

    function _transferOperator(address newOperator_) internal {
        require(
            newOperator_ != address(0),
            'operator: zero address given for new operator'
        );
        emit OperatorTransferred(address(0), newOperator_);
        _operator = newOperator_;
    }
}

pragma solidity ^0.6.0;

contract ContractGuard {
    mapping(uint256 => mapping(address => bool)) private _status;

    function checkSameOriginReentranted() internal view returns (bool) {
        return _status[block.number][tx.origin];
    }

    function checkSameSenderReentranted() internal view returns (bool) {
        return _status[block.number][msg.sender];
    }

    modifier onlyOneBlock() {
        require(
            !checkSameOriginReentranted(),
            'ContractGuard: one block, one function'
        );
        require(
            !checkSameSenderReentranted(),
            'ContractGuard: one block, one function'
        );

        _;

        _status[block.number][tx.origin] = true;
        _status[block.number][msg.sender] = true;
    }
}

pragma solidity ^0.6.0;

interface IHCAsset {
    function mint(address recipient, uint256 amount) external returns (bool);

    function burn(uint256 amount) external;

    function burnFrom(address from, uint256 amount) external;

    function isOperator() external returns (bool);

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

// 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 ^0.6.2;

/**
 * @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) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

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

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

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

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

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

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

// 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;

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;
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/math/Math.sol';
import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
import '@openzeppelin/contracts/utils/ReentrancyGuard.sol';

import './interfaces/IOracle.sol';
import './interfaces/IBoardroom.sol';
import './interfaces/IHCAsset.sol';
import './interfaces/ISimpleERCFund.sol';
import './lib/Babylonian.sol';
import './lib/FixedPoint.sol';
import './lib/Safe112.sol';
import './owner/Operator.sol';
import './utils/Epoch.sol';
import './utils/ContractGuard.sol';

/**
 * @title OK Cash Treasury contract
 * @notice Monetary policy logic to adjust supplies of ok cash assets
 * @author Summer Smith & Rick Sanchez
 */
contract Treasury is ContractGuard, Epoch {
    using FixedPoint for *;
    using SafeERC20 for IERC20;
    using Address for address;
    using SafeMath for uint256;
    using Safe112 for uint112;

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

    // ========== FLAGS
    bool public migrated = false;
    bool public initialized = false;

    // ========== CORE
    address public fund;
    address public cash;
    address public bond;
    address public share;
    address public boardroom;

    address public bondOracle;
    address public seigniorageOracle;

    // ========== PARAMS
    uint256 public cashPriceOne;
    uint256 public cashPriceCeiling;
    uint256 public bondDepletionFloor;
    uint256 private accumulatedSeigniorage = 0;
    uint256 public fundAllocationRate = 2; // %

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _cash,
        address _bond,
        address _share,
        address _bondOracle,
        address _seigniorageOracle,
        address _boardroom,
        address _fund,
        uint256 _startTime
    ) public Epoch(1 days, _startTime, 0) {
        cash = _cash;
        bond = _bond;
        share = _share;
        bondOracle = _bondOracle;
        seigniorageOracle = _seigniorageOracle;

        boardroom = _boardroom;
        fund = _fund;

        cashPriceOne = 10**18;
        cashPriceCeiling = uint256(105).mul(cashPriceOne).div(10**2);

        bondDepletionFloor = uint256(1000).mul(cashPriceOne);
    }

    /* =================== Modifier =================== */

    modifier checkMigration {
        require(!migrated, 'Treasury: migrated');

        _;
    }

    modifier checkOperator {
        require(
            IHCAsset(cash).operator() == address(this) &&
                IHCAsset(bond).operator() == address(this) &&
                IHCAsset(share).operator() == address(this) &&
                Operator(boardroom).operator() == address(this),
            'Treasury: need more permission'
        );

        _;
    }

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

    // budget
    function getReserve() public view returns (uint256) {
        return accumulatedSeigniorage;
    }

    // oracle
    function getBondOraclePrice() public view returns (uint256) {
        return _getCashPrice(bondOracle);
    }

    function getSeigniorageOraclePrice() public view returns (uint256) {
        return _getCashPrice(seigniorageOracle);
    }

    function _getCashPrice(address oracle) internal view returns (uint256) {
        try IOracle(oracle).consult(cash, 1e18) returns (uint256 price) {
            return price;
        } catch {
            revert('Treasury: failed to consult cash price from the oracle');
        }
    }

    /* ========== GOVERNANCE ========== */

    function initialize() public checkOperator {
        require(!initialized, 'Treasury: initialized');

        // burn all of it's balance
        IHCAsset(cash).burn(IERC20(cash).balanceOf(address(this)));

        // set accumulatedSeigniorage to it's balance
        accumulatedSeigniorage = IERC20(cash).balanceOf(address(this));

        initialized = true;
        emit Initialized(msg.sender, block.number);
    }

    function migrate(address target) public onlyOperator checkOperator {
        require(!migrated, 'Treasury: migrated');

        // cash
        Operator(cash).transferOperator(target);
        Operator(cash).transferOwnership(target);
        IERC20(cash).transfer(target, IERC20(cash).balanceOf(address(this)));

        // bond
        Operator(bond).transferOperator(target);
        Operator(bond).transferOwnership(target);
        IERC20(bond).transfer(target, IERC20(bond).balanceOf(address(this)));

        // share
        Operator(share).transferOperator(target);
        Operator(share).transferOwnership(target);
        IERC20(share).transfer(target, IERC20(share).balanceOf(address(this)));

        migrated = true;
        emit Migration(target);
    }

    function setFund(address newFund) public onlyOperator {
        fund = newFund;
        emit ContributionPoolChanged(msg.sender, newFund);
    }

    function setFundAllocationRate(uint256 rate) public onlyOperator {
        fundAllocationRate = rate;
        emit ContributionPoolRateChanged(msg.sender, rate);
    }

    /* ========== MUTABLE FUNCTIONS ========== */

    function _updateCashPrice() internal {
        try IOracle(bondOracle).update()  {} catch {}
        try IOracle(seigniorageOracle).update()  {} catch {}
    }

    function buyBonds(uint256 amount, uint256 targetPrice)
        external
        onlyOneBlock
        checkMigration
        checkStartTime
        checkOperator
    {
        require(amount > 0, 'Treasury: cannot purchase bonds with zero amount');

        uint256 cashPrice = _getCashPrice(bondOracle);
        require(cashPrice == targetPrice, 'Treasury: cash price moved');
        require(
            cashPrice < cashPriceOne, // price < $1
            'Treasury: cashPrice not eligible for bond purchase'
        );

        uint256 bondPrice = cashPrice;

        IHCAsset(cash).burnFrom(msg.sender, amount);
        IHCAsset(bond).mint(msg.sender, amount.mul(1e18).div(bondPrice));
        _updateCashPrice();

        emit BoughtBonds(msg.sender, amount);
    }

    function redeemBonds(uint256 amount, uint256 targetPrice)
        external
        onlyOneBlock
        checkMigration
        checkStartTime
        checkOperator
    {
        require(amount > 0, 'Treasury: cannot redeem bonds with zero amount');

        uint256 cashPrice = _getCashPrice(bondOracle);
        require(cashPrice == targetPrice, 'Treasury: cash price moved');
        require(
            cashPrice > cashPriceCeiling, // price > $1.05
            'Treasury: cashPrice not eligible for bond purchase'
        );
        require(
            IERC20(cash).balanceOf(address(this)) >= amount,
            'Treasury: treasury has no more budget'
        );

        accumulatedSeigniorage = accumulatedSeigniorage.sub(
            Math.min(accumulatedSeigniorage, amount)
        );

        IHCAsset(bond).burnFrom(msg.sender, amount);
        IERC20(cash).safeTransfer(msg.sender, amount);
        _updateCashPrice();

        emit RedeemedBonds(msg.sender, amount);
    }

    function allocateSeigniorage()
        external
        onlyOneBlock
        checkMigration
        checkStartTime
        checkEpoch
        checkOperator
    {
        _updateCashPrice();
        uint256 cashPrice = _getCashPrice(seigniorageOracle);
        if (cashPrice <= cashPriceCeiling) {
            return; // just advance epoch instead revert
        }

        // circulating supply
        uint256 cashSupply = IERC20(cash).totalSupply().sub(
            accumulatedSeigniorage
        );
        uint256 percentage = cashPrice.sub(cashPriceOne);
        uint256 seigniorage = cashSupply.mul(percentage).div(1e18);
        IHCAsset(cash).mint(address(this), seigniorage);

        // ======================== BIP-3
        uint256 fundReserve = seigniorage.mul(fundAllocationRate).div(100);
        if (fundReserve > 0) {
            IERC20(cash).safeApprove(fund, fundReserve);
            ISimpleERCFund(fund).deposit(
                cash,
                fundReserve,
                'Treasury: Seigniorage Allocation'
            );
            emit ContributionPoolFunded(now, fundReserve);
        }

        seigniorage = seigniorage.sub(fundReserve);

        // ======================== BIP-4
        uint256 treasuryReserve = Math.min(
            seigniorage,
            IERC20(bond).totalSupply().sub(accumulatedSeigniorage)
        );
        if (treasuryReserve > 0) {
            accumulatedSeigniorage = accumulatedSeigniorage.add(
                treasuryReserve
            );
            emit TreasuryFunded(now, treasuryReserve);
        }

        // boardroom
        uint256 boardroomReserve = seigniorage.sub(treasuryReserve);
        if (boardroomReserve > 0) {
            IERC20(cash).safeApprove(boardroom, boardroomReserve);
            IBoardroom(boardroom).allocateSeigniorage(boardroomReserve);
            emit BoardroomFunded(now, boardroomReserve);
        }
    }

    // GOV
    event Initialized(address indexed executor, uint256 at);
    event Migration(address indexed target);
    event ContributionPoolChanged(address indexed operator, address newFund);
    event ContributionPoolRateChanged(
        address indexed operator,
        uint256 newRate
    );

    // CORE
    event RedeemedBonds(address indexed from, uint256 amount);
    event BoughtBonds(address indexed from, uint256 amount);
    event TreasuryFunded(uint256 timestamp, uint256 seigniorage);
    event BoardroomFunded(uint256 timestamp, uint256 seigniorage);
    event ContributionPoolFunded(uint256 timestamp, uint256 seigniorage);
}

// 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);
    }
}

// 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;
    }
}

pragma solidity ^0.6.0;

interface IOracle {
    function update() external;

    function consult(address token, uint256 amountIn)
        external
        view
        returns (uint256 amountOut);
    // function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestamp);
}

pragma solidity ^0.6.0;

interface IBoardroom {
    function allocateSeigniorage(uint256 amount) external;
}

pragma solidity ^0.6.0;

interface ISimpleERCFund {
    function deposit(
        address token,
        uint256 amount,
        string memory reason
    ) external;

    function withdraw(
        address token,
        uint256 amount,
        address to,
        string memory reason
    ) external;
}

pragma solidity ^0.6.0;

library Babylonian {
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
        // else z = 0
    }
}

pragma solidity ^0.6.0;

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 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = uint256(1) << RESOLUTION;
    uint256 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, uint256 y)
        internal
        pure
        returns (uq144x112 memory)
    {
        uint256 z;
        require(
            y == 0 || (z = uint256(self._x) * y) / y == uint256(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 ^0.6.0;

import '@openzeppelin/contracts/math/SafeMath.sol';

import '../owner/Operator.sol';

contract Epoch is Operator {
    using SafeMath for uint256;

    uint256 private period;
    uint256 private startTime;
    uint256 private epoch;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        uint256 _period,
        uint256 _startTime,
        uint256 _startEpoch
    ) public {
        period = _period;
        startTime = _startTime;
        epoch = _startEpoch;
    }

    /* ========== Modifier ========== */

    modifier checkStartTime {
        require(now >= startTime, 'Epoch: not started yet');

        _;
    }

    modifier checkEpoch {
        require(now >= nextEpochPoint(), 'Epoch: not allowed');

        _;

        epoch = epoch.add(1);
    }

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

    function getCurrentEpoch() public view returns (uint256) {
        return epoch;
    }

    function getPeriod() public view returns (uint256) {
        return period;
    }

    function getStartTime() public view returns (uint256) {
        return startTime;
    }

    function nextEpochPoint() public view returns (uint256) {
        return startTime.add(epoch.mul(period));
    }

    /* ========== GOVERNANCE ========== */

    function setPeriod(uint256 _period) external onlyOperator {
        period = _period;
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

import './owner/Operator.sol';

contract VoteProxy is Operator {
    // Events
    event BoardroomChanged(
        address indexed operator,
        address indexed oldBoardroom,
        address indexed newBoardroom
    );

    // Boardroom
    address public boardroom;

    constructor(address _boardroom) public {
        boardroom = _boardroom;
    }

    function setBoardroom(address newBoardroom) public onlyOperator {
        address oldBoardroom = boardroom;
        boardroom = newBoardroom;
        emit BoardroomChanged(msg.sender, oldBoardroom, newBoardroom);
    }

    function decimals() external pure returns (uint8) {
        return uint8(18);
    }

    function name() external pure returns (string memory) {
        return 'HCS in Boardroom';
    }

    function symbol() external pure returns (string memory) {
        return 'SHCS';
    }

    function totalSupply() external view returns (uint256) {
        return IERC20(boardroom).totalSupply();
    }

    function balanceOf(address _voter) external view returns (uint256) {
        return IERC20(boardroom).balanceOf(_voter);
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

import '../owner/Operator.sol';
import '../interfaces/IBoardroom.sol';

contract MockBoardroom is IBoardroom, Operator {
    using SafeERC20 for IERC20;

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

    IERC20 public cash;

    /* ========== CONSTRUCTOR ========== */

    constructor(address _cash) public {
        cash = IERC20(_cash);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    function allocateSeigniorage(uint256 amount)
        external
        override
        onlyOperator
    {
        require(amount > 0, 'Boardroom: Cannot allocate 0');
        cash.safeTransferFrom(msg.sender, address(this), amount);
        emit RewardAdded(msg.sender, amount);
    }

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

    event RewardAdded(address indexed user, uint256 reward);
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

import './owner/Operator.sol';
import './interfaces/ISimpleERCFund.sol';

contract SimpleERCFund is ISimpleERCFund, Operator {
    using SafeERC20 for IERC20;

    function deposit(
        address token,
        uint256 amount,
        string memory reason
    ) public override {
        IERC20(token).safeTransferFrom(msg.sender, address(this), amount);
        emit Deposit(msg.sender, now, reason);
    }

    function withdraw(
        address token,
        uint256 amount,
        address to,
        string memory reason
    ) public override onlyOperator {
        IERC20(token).safeTransfer(to, amount);
        emit Withdrawal(msg.sender, to, now, reason);
    }

    event Deposit(address indexed from, uint256 indexed at, string reason);
    event Withdrawal(
        address indexed from,
        address indexed to,
        uint256 indexed at,
        string reason
    );
}

pragma solidity ^0.6.0;

/*
 * 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.
 */
import '@openzeppelin/contracts/math/SafeMath.sol';

contract Timelock {
    using SafeMath for uint256;

    event NewAdmin(address indexed newAdmin);
    event NewPendingAdmin(address indexed newPendingAdmin);
    event NewDelay(uint256 indexed newDelay);
    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;

    mapping(bytes32 => bool) public queuedTransactions;

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

        admin = admin_;
        delay = delay_;
    }

    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 acceptAdmin() public {
        require(
            msg.sender == pendingAdmin,
            'Timelock::acceptAdmin: Call must come from pendingAdmin.'
        );
        admin = msg.sender;
        pendingAdmin = address(0);

        emit NewAdmin(admin);
    }

    function setPendingAdmin(address pendingAdmin_) public {
        require(
            msg.sender == address(this),
            'Timelock::setPendingAdmin: Call must come from Timelock.'
        );
        pendingAdmin = pendingAdmin_;

        emit NewPendingAdmin(pendingAdmin);
    }

    function queueTransaction(
        address target,
        uint256 value,
        string memory signature,
        bytes memory data,
        uint256 eta
    ) public returns (bytes32) {
        require(
            msg.sender == admin,
            'Timelock::queueTransaction: Call must come from admin.'
        );
        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 memory signature,
        bytes memory data,
        uint256 eta
    ) public {
        require(
            msg.sender == admin,
            'Timelock::cancelTransaction: Call must come from 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 memory signature,
        bytes memory data,
        uint256 eta
    ) public payable returns (bytes memory) {
        require(
            msg.sender == admin,
            'Timelock::executeTransaction: Call must come from admin.'
        );

        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;

        bytes memory callData;

        if (bytes(signature).length == 0) {
            callData = data;
        } else {
            callData = abi.encodePacked(
                bytes4(keccak256(bytes(signature))),
                data
            );
        }

        // solium-disable-next-line security/no-call-value
        (bool success, bytes memory returnData) = target.call{value: value}(
            callData
        );
        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;
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/math/SafeMath.sol';

import '../interfaces/IOracle.sol';

contract MockOracle is IOracle {
    using SafeMath for uint256;

    uint256 public price;
    bool public error;

    function setPrice(uint256 _price) public {
        price = _price;
    }

    function setRevert(bool _error) public {
        error = _error;
    }

    function update() external override {
        require(!error, 'Oracle: mocked error');
        emit Updated(0, 0);
    }

    function consult(address, uint256 amountIn)
        external
        override
        view
        returns (uint256)
    {
        return price.mul(amountIn).div(1e18);
    }

    event Updated(uint256 price0CumulativeLast, uint256 price1CumulativeLast);
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/math/SafeMath.sol';

import './lib/Babylonian.sol';
import './lib/FixedPoint.sol';
import './lib/UniswapV2Library.sol';
import './lib/UniswapV2OracleLibrary.sol';
import './utils/Epoch.sol';
import './interfaces/IUniswapV2Pair.sol';
import './interfaces/IUniswapV2Factory.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 Oracle is Epoch {
    using FixedPoint for *;
    using SafeMath for uint256;

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

    // uniswap
    address public token0;
    address public token1;
    IUniswapV2Pair public pair;

    // oracle
    uint32 public blockTimestampLast;
    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    FixedPoint.uq112x112 public price0Average;
    FixedPoint.uq112x112 public price1Average;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _factory,
        address _tokenA,
        address _tokenB,
        uint256 _period,
        uint256 _startTime
    ) public Epoch(_period, _startTime, 0) {
        IUniswapV2Pair _pair = IUniswapV2Pair(
            UniswapV2Library.pairFor(_factory, _tokenA, _tokenB)
        );
        pair = _pair;
        token0 = _pair.token0();
        token1 = _pair.token1();
        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, 'Oracle: NO_RESERVES'); // ensure that there's liquidity in the pair
    }

    /* ========== MUTABLE FUNCTIONS ========== */

    /** @dev Updates 1-day EMA price from Uniswap.  */
    function update() external checkEpoch {
        (
            uint256 price0Cumulative,
            uint256 price1Cumulative,
            uint32 blockTimestamp
        ) = UniswapV2OracleLibrary.currentCumulativePrices(address(pair));
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired

        if (timeElapsed == 0) {
            // prevent divided by zero
            return;
        }

        // 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;

        emit Updated(price0Cumulative, price1Cumulative);
    }

    // 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 (uint144 amountOut)
    {
        if (token == token0) {
            amountOut = price0Average.mul(amountIn).decode144();
        } else {
            require(token == token1, 'Oracle: INVALID_TOKEN');
            amountOut = price1Average.mul(amountIn).decode144();
        }
    }

    function pairFor(
        address factory,
        address tokenA,
        address tokenB
    ) external pure returns (address lpt) {
        return UniswapV2Library.pairFor(factory, tokenA, tokenB);
    }

    event Updated(uint256 price0CumulativeLast, uint256 price1CumulativeLast);
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/math/SafeMath.sol';
import '../interfaces/IUniswapV2Pair.sol';

library UniswapV2Library {
    using SafeMath for uint256;

    // 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(
            uint256(
                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 (uint256 reserveA, uint256 reserveB) {
        (address token0, ) = sortTokens(tokenA, tokenB);
        (uint256 reserve0, uint256 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(
        uint256 amountA,
        uint256 reserveA,
        uint256 reserveB
    ) internal pure returns (uint256 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(
        uint256 amountIn,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountOut) {
        require(amountIn > 0, 'UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT');
        require(
            reserveIn > 0 && reserveOut > 0,
            'UniswapV2Library: INSUFFICIENT_LIQUIDITY'
        );
        uint256 amountInWithFee = amountIn.mul(997);
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 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(
        uint256 amountOut,
        uint256 reserveIn,
        uint256 reserveOut
    ) internal pure returns (uint256 amountIn) {
        require(amountOut > 0, 'UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT');
        require(
            reserveIn > 0 && reserveOut > 0,
            'UniswapV2Library: INSUFFICIENT_LIQUIDITY'
        );
        uint256 numerator = reserveIn.mul(amountOut).mul(1000);
        uint256 denominator = reserveOut.sub(amountOut).mul(997);
        amountIn = (numerator / denominator).add(1);
    }

    // performs chained getAmountOut calculations on any number of pairs
    function getAmountsOut(
        address factory,
        uint256 amountIn,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint256[](path.length);
        amounts[0] = amountIn;
        for (uint256 i; i < path.length - 1; i++) {
            (uint256 reserveIn, uint256 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,
        uint256 amountOut,
        address[] memory path
    ) internal view returns (uint256[] memory amounts) {
        require(path.length >= 2, 'UniswapV2Library: INVALID_PATH');
        amounts = new uint256[](path.length);
        amounts[amounts.length - 1] = amountOut;
        for (uint256 i = path.length - 1; i > 0; i--) {
            (uint256 reserveIn, uint256 reserveOut) = getReserves(
                factory,
                path[i - 1],
                path[i]
            );
            amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
        }
    }
}

pragma solidity ^0.6.0;

import './FixedPoint.sol';
import '../interfaces/IUniswapV2Pair.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 (
            uint256 price0Cumulative,
            uint256 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 +=
                uint256(FixedPoint.fraction(reserve1, reserve0)._x) *
                timeElapsed;
            // counterfactual
            price1Cumulative +=
                uint256(FixedPoint.fraction(reserve0, reserve1)._x) *
                timeElapsed;
        }
    }
}

pragma solidity ^0.6.0;

interface IUniswapV2Pair {
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 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 (uint256);

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

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

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

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 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 (uint256);

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

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    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 (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

pragma solidity ^0.6.0;

interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

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

    function allPairs(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

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

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

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

    IERC20 public weth;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        weth.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        weth.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract HCCWETHPool is HayekPlateWrapper, WETHWrapper, IRewardDistributionRecipient {
    IERC20 public hayekCash;
    uint256 public DURATION = 10 days;
    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;
    mapping(address => uint256) public deposits;

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

    constructor(
        address hayekCash_,
        address weth_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekCash = IERC20(hayekCash_);
        weth = IERC20(weth_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public 
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCWETHPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCWETHPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    // stake visibility is public as overriding LPTokenWrapper's stake() function
    function stake(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCWETHPool: Cannot stake 0');
        uint256 newDeposit = deposits[msg.sender].add(amount);
        require(
            newDeposit <= 10e18,
            'HCCWETHPool: deposit amount exceeds maximum 10'
        );
        deposits[msg.sender] = newDeposit;
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCWETHPool: Cannot withdraw 0');
        deposits[msg.sender] = deposits[msg.sender].sub(amount);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekCash.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);
        }
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/access/Ownable.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

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
        virtual
        onlyOwner
    {
        rewardDistribution = _rewardDistribution;
    }
}

pragma solidity ^0.6.0;

interface IDistributor {
    function distribute() external;
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

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

    IERC20 public dai;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        dai.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        dai.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate;
    
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract HCCDAIPool is HayekPlateWrapper, DAIWrapper, IRewardDistributionRecipient {
    IERC20 public hayekCash;
    uint256 public DURATION = 10 days;
    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;
    mapping(address => uint256) public deposits;

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

    constructor(
        address hayekCash_,
        address dai_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekCash = IERC20(hayekCash_);
        dai = IERC20(dai_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCDAIPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCDAIPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    // stake visibility is public as overriding LPTokenWrapper's stake() function
    function stake(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCDAIPool: Cannot stake 0');
        uint256 newDeposit = deposits[msg.sender].add(amount);
        require(
            newDeposit <= 20000e18,
            'HCCDAIPool: deposit amount exceeds maximum 20000'
        );
        deposits[msg.sender] = newDeposit;
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCDAIPool: Cannot withdraw 0');
        deposits[msg.sender] = deposits[msg.sender].sub(amount);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekCash.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);
        }
    }
}

pragma solidity ^0.6.0;

import './interfaces/IDistributor.sol';

contract Distributor {
    IDistributor[] public distributors;

    constructor(IDistributor[] memory _distributors) public {
        distributors = _distributors;
    }

    function distribute() public {
        for (uint256 i = 0; i < distributors.length; i++) {
            distributors[i].distribute();
        }
    }
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

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

    IERC20 public usdt;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        usdt.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        usdt.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 
    
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract HCCUSDTPool is HayekPlateWrapper, USDTWrapper, IRewardDistributionRecipient {
    IERC20 public hayekCash;
    uint256 public DURATION = 10 days;
    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;
    mapping(address => uint256) public deposits;

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

    constructor(
        address hayekCash_,
        address usdt_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekCash = IERC20(hayekCash_);
        usdt = IERC20(usdt_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUSDTPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUSDTPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    // stake visibility is public as overriding LPTokenWrapper's stake() function
    function stake(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUSDTPool: Cannot stake 0');
        uint256 newDeposit = deposits[msg.sender].add(amount);
        require(
            newDeposit <= 20000e6,
            'HCCUSDTPool: deposit amount exceeds maximum 20000'
        );
        deposits[msg.sender] = newDeposit;
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUSDTPool: Cannot withdraw 0');
        deposits[msg.sender] = deposits[msg.sender].sub(amount);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekCash.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);
        }
    }
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

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

    IERC20 public usdc;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        usdc.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        usdc.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract HCCUSDCPool is HayekPlateWrapper, USDCWrapper, IRewardDistributionRecipient {
    IERC20 public hayekCash;
    uint256 public DURATION = 10 days;
    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;
    mapping(address => uint256) public deposits;

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

    constructor(
        address hayekCash_,
        address usdc_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekCash = IERC20(hayekCash_);
        usdc = IERC20(usdc_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUSDCPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUSDCPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    // stake visibility is public as overriding LPTokenWrapper's stake() function
    function stake(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUSDCPool: Cannot stake 0');
        uint256 newDeposit = deposits[msg.sender].add(amount);
        require(
            newDeposit <= 20000e6,
            'HCCUSDCPool: deposit amount exceeds maximum 20000'
        );
        deposits[msg.sender] = newDeposit;
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUSDCPool: Cannot withdraw 0');
        deposits[msg.sender] = deposits[msg.sender].sub(amount);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekCash.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);
        }
    }
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

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

    IERC20 public uni;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        uni.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        uni.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract HCCUNIPool is HayekPlateWrapper, UNIWrapper, IRewardDistributionRecipient {
    IERC20 public hayekCash;
    uint256 public DURATION = 10 days;
    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;
    mapping(address => uint256) public deposits;

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

    constructor(
        address hayekCash_,
        address uni_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekCash = IERC20(hayekCash_);
        uni = IERC20(uni_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUNIPool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'HCCUNIPool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

    // stake visibility is public as overriding LPTokenWrapper's stake() function
    function stake(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUNIPool: Cannot stake 0');
        uint256 newDeposit = deposits[msg.sender].add(amount);
        require(
            newDeposit <= 1000e18,
            'HCCUNIPool: deposit amount exceeds maximum 1000'
        );
        deposits[msg.sender] = newDeposit;
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.stake(amount, userBoostPower);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'HCCUNIPool: Cannot withdraw 0');
        deposits[msg.sender] = deposits[msg.sender].sub(amount);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekCash.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);
        }
    }
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

import '../token/LPTokenWrapper.sol';

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }
    
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract DAIHCSLPTokenSharePool is
    LPTokenWrapper,
    HayekPlateWrapper,
    IRewardDistributionRecipient
{
    IERC20 public hayekShare;
    uint256 public DURATION = 365 days;

    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;

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

    constructor(
        address hayekShare_,
        address lptoken_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekShare = IERC20(hayekShare_);
        lpt = IERC20(lptoken_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'DAIHCSLPTokenSharePool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkStart
    {
        require(tokenId > 0, 'DAIHCSLPTokenSharePool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

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

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkStart
    {
        require(amount > 0, 'DAIHCSLPTokenSharePool: Cannot withdraw 0');
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        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;
            hayekShare.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);
        }
    }
}

pragma solidity ^0.6.0;

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

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

    IERC20 public lpt;

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

    function totalInternalSupply() public view returns (uint256) {
        return _totalInternalSupply;
    }

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

    function internalBalanceOf(address account) public view returns (uint256) {
        return _internalBalances[account];
    }

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

    function stake(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.add(amount);
        _totalInternalSupply = _totalInternalSupply.add(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].add((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        lpt.safeTransferFrom(msg.sender, address(this), amount);
    }

    function withdraw(uint256 amount, uint256 userBoostPower) internal {
        _totalSupply = _totalSupply.sub(amount);
        _totalInternalSupply = _totalInternalSupply.sub(amount.mul(userBoostPower.add(1e18)).div(1e18));
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        _internalBalances[msg.sender] = _internalBalances[msg.sender].sub((amount.mul(userBoostPower.add(1e18)).div(1e18)));
        lpt.safeTransfer(msg.sender, amount);
    }

    function _update(uint256 _userBoostPower) internal {
        uint256 oldInternalBalance = _internalBalances[msg.sender];
        uint256 newInternalBalance = _balances[msg.sender].mul(_userBoostPower.add(1e18)).div(1e18);
        _internalBalances[msg.sender] = newInternalBalance;
        _totalInternalSupply = _totalInternalSupply.sub(oldInternalBalance).add(newInternalBalance);
    }
}

pragma solidity ^0.6.0;
/**
 *Submitted for verification at Etherscan.io on 2020-07-17
 */

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

* Synthetix: HAYEKCASHRewards.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, 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
*/

// File: @openzeppelin/contracts/math/Math.sol

import '@openzeppelin/contracts/math/Math.sol';

// File: @openzeppelin/contracts/math/SafeMath.sol

import '@openzeppelin/contracts/math/SafeMath.sol';

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

// File: @openzeppelin/contracts/utils/Address.sol

import '@openzeppelin/contracts/utils/Address.sol';

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';

// File: contracts/IRewardDistributionRecipient.sol

import '../interfaces/IRewardDistributionRecipient.sol';

import '../token/LPTokenWrapper.sol';

interface IHayekPlate {
    function ownerOf(uint256 tokenId) external view returns (address);
    function transfer(address _to, uint256 _tokenId) external;
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    function getFeatureAddr() external returns(address);
}

interface IHayekPlateCustomData {
    function getTokenIdBoostPower(uint256 tokenId) external view returns(uint256);
}

contract HayekPlateWrapper {
    using SafeMath for uint256;
    IHayekPlate public hayekPlate; 

    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
    mapping(address => uint256[]) private _ownedTokens;
    mapping(uint256 => uint256) private _ownedTokensIndex;
    mapping(address => uint256) private _ownedBoostPower;
    mapping (uint256 => address) private _tokenOwner;
    
    uint256[] private _allTokens;
    mapping(uint256 => uint256) private _allTokensIndex;

    function totalNFTSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    function stakePlate(uint256 tokenId) public virtual {
        require(msg.sender == hayekPlate.ownerOf(tokenId), 'This account is not owner');
        _tokenOwner[tokenId] = msg.sender;
        _addTokenToOwnerEnumeration(msg.sender, tokenId);
        _addTokenToAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] += _plateBoostPower;
        hayekPlate.safeTransferFrom(msg.sender, address(this), tokenId);
    }

    function withdrawPlate(uint256 tokenId) public virtual {
        require(msg.sender == _tokenOwner[tokenId], 'This account is not owner');
        _removeTokenFromOwnerEnumeration(msg.sender, tokenId);
        _removeTokenFromAllTokensEnumeration(tokenId);
        uint256 _plateBoostPower = getTokenIdBoostPower(tokenId);
        _ownedBoostPower[msg.sender] -= _plateBoostPower;
        hayekPlate.transfer(msg.sender, tokenId);
    }

    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId;
            _ownedTokensIndex[lastTokenId] = tokenIndex;
        }

        _ownedTokens[from].pop();
    }

    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId;
        _allTokensIndex[lastTokenId] = tokenIndex;

        _allTokens.pop();
        _allTokensIndex[tokenId] = 0;
    }

    function getAccountBoostPower(address account) public view returns(uint256){
        return _ownedBoostPower[account];
    }

    function getStakedTokenIds(address account) public view returns(uint256[] memory){
        return _ownedTokens[account];
    }

    function getTokenIdBoostPower(uint256 tokenId) internal returns(uint256){
        address customDataAddr = hayekPlate.getFeatureAddr();
        IHayekPlateCustomData hayekPlateCustomData = IHayekPlateCustomData(customDataAddr);
        return hayekPlateCustomData.getTokenIdBoostPower(tokenId);
    }

    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external 
        returns (bytes4) 
    {
        // Shh
        return _ERC721_RECEIVED;
    }
}

contract DAIHCCLPTokenSharePool is
    LPTokenWrapper,
    HayekPlateWrapper,
    IRewardDistributionRecipient
{
    IERC20 public hayekShare;
    uint256 public constant DURATION = 30 days;

    uint256 public initreward = 18750 * 10**18; // 18750 Shares
    uint256 public starttime; // 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;

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

    constructor(
        address hayekShare_,
        address lptoken_,
        address hayekPlate_,
        uint256 starttime_
    ) public {
        hayekShare = IERC20(hayekShare_);
        lpt = IERC20(lptoken_);
        hayekPlate = IHayekPlate(hayekPlate_);
        starttime = starttime_;
    }

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

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

    function rewardPerToken() public view returns (uint256) {
        if (totalInternalSupply() == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable()
                    .sub(lastUpdateTime)
                    .mul(rewardRate)
                    .mul(1e18)
                    .div(totalInternalSupply())
            );
    }

    function earned(address account) public view returns (uint256) {
        return
            internalBalanceOf(account)
                .mul(rewardPerToken().sub(userRewardPerTokenPaid[account]))
                .div(1e18)
                .add(rewards[account]);
    }

    function stakePlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkhalve
        checkStart
    {
        require(tokenId > 0, 'DAIHCCLPTokenSharePool: Invalid tokenId');
        super.stakePlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateStaked(msg.sender, tokenId);
    }

    function withdrawPlate(uint256 tokenId) 
        public
        override
        updateReward(msg.sender)
        checkhalve
        checkStart
    {
        require(tokenId > 0, 'DAIHCCLPTokenSharePool: Invalid tokenId');
        super.withdrawPlate(tokenId);
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        _update(userBoostPower);
        emit PlateWithdrawn(msg.sender, tokenId);
    }

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

    function withdraw(uint256 amount)
        public
        updateReward(msg.sender)
        checkhalve
        checkStart
    {
        require(amount > 0, 'Cannot withdraw 0');
        uint256 userBoostPower = getAccountBoostPower(msg.sender);
        super.withdraw(amount, userBoostPower);
        emit Withdrawn(msg.sender, amount);
    }

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

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

    modifier checkhalve() {
        if (block.timestamp >= periodFinish) {
            initreward = initreward.mul(75).div(100);
            rewardRate = initreward.div(DURATION);
            periodFinish = block.timestamp.add(DURATION);
            emit RewardAdded(initreward);
        }
        _;
    }

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

    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 = initreward.div(DURATION);
            lastUpdateTime = starttime;
            periodFinish = starttime.add(DURATION);
            emit RewardAdded(reward);
        }
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/math/SafeMath.sol';

interface IHayekPlate {
    function issueAirdrop(address to, uint256 tokenId) external;
}

contract HayekPlateAirdropIssuer {
    using SafeMath for uint256;
    IHayekPlate public hayekPlatel;
    struct AirdropPool {
        uint256 aID;
        uint256 bID;
        uint256 cID;
        uint256 dID;
        uint256 eID;
        uint256 fID;
        uint256 gID;
        uint256 hID;

        uint256 aIDAmount;
        uint256 bIDAmount;
        uint256 cIDAmount;
        uint256 dIDAmount;
        uint256 eIDAmount;
        uint256 fIDAmount;
        uint256 gIDAmount;
        uint256 hIDAmount;

        uint256 allAmount;
    }

    uint256 public totolUnclaimed = 12705;

    mapping(address => AirdropPool) private airdropRemaining;
    mapping(address => bool) private airdropPoolAddr;

    constructor (IHayekPlate _hayekPlate, address[] memory airdropPools) public {
        hayekPlatel = _hayekPlate;
        for (uint256 i = 0; i < airdropPools.length; i++) {
            airdropRemaining[airdropPools[i]] = AirdropPool(
                i * 1 + 1,
                i * 20 + 20001, 
                i * 40 + 30001, 
                i * 80 + 40001, 
                i * 160 + 50001, 
                i * 320 + 60001, 
                i * 640 + 70001, 
                i * 1280+ 80001, 
                1,20,40,80,160,320,640,1280,2541);
            airdropPoolAddr[airdropPools[i]] = true;
        }
    }

    modifier isAirdropPool() {
        require(airdropPoolAddr[msg.sender], 'Not Airdrop');
        _;
    }

    function claimONEPlate(address account) public isAirdropPool {
        AirdropPool storage airdropPool = airdropRemaining[msg.sender];
        uint256 newTokenId = rand(account, airdropPool);
        hayekPlatel.issueAirdrop(account, newTokenId);
        totolUnclaimed = totolUnclaimed.sub(1);
    }

    function getTargetAirdropStatus(address _airdropPool) public view returns(uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256, uint256) {
        AirdropPool storage airdropPool = airdropRemaining[_airdropPool];
        return (airdropPool.aIDAmount, airdropPool.bIDAmount, airdropPool.cIDAmount, airdropPool.dIDAmount, airdropPool.eIDAmount, airdropPool.fIDAmount, airdropPool.gIDAmount, airdropPool.hIDAmount, airdropPool.allAmount);
    }

    function rand(address account, AirdropPool storage airdropPool) internal returns(uint256) {
        uint256 random = uint256(keccak256(abi.encode(block.difficulty, now, account, airdropPool.allAmount)));
        uint256 randomBase = random % airdropPool.allAmount;
        uint256 tokenId = 0;
        if (randomBase < airdropPool.aIDAmount) {
            tokenId = airdropPool.aID;
            airdropPool.aID = airdropPool.aID.add(1);
            airdropPool.aIDAmount = airdropPool.aIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount)) {
            tokenId = airdropPool.bID;
            airdropPool.bID = airdropPool.bID.add(1);
            airdropPool.bIDAmount = airdropPool.bIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount)) {
            tokenId = airdropPool.cID;
            airdropPool.cID = airdropPool.cID.add(1);
            airdropPool.cIDAmount = airdropPool.cIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount + airdropPool.dIDAmount)) {
            tokenId = airdropPool.dID;
            airdropPool.dID = airdropPool.dID.add(1);
            airdropPool.dIDAmount = airdropPool.dIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount + airdropPool.dIDAmount + airdropPool.eIDAmount)) {
            tokenId = airdropPool.eID;
            airdropPool.eID = airdropPool.eID.add(1);
            airdropPool.eIDAmount = airdropPool.eIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount + airdropPool.dIDAmount + airdropPool.eIDAmount + airdropPool.fIDAmount)) {
            tokenId = airdropPool.fID;
            airdropPool.fID = airdropPool.fID.add(1);
            airdropPool.fIDAmount = airdropPool.fIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount + airdropPool.dIDAmount + airdropPool.eIDAmount + airdropPool.fIDAmount + airdropPool.gIDAmount)) {
            tokenId = airdropPool.gID;
            airdropPool.gID = airdropPool.gID.add(1);
            airdropPool.gIDAmount = airdropPool.gIDAmount.sub(1);
        } else if (randomBase < (airdropPool.aIDAmount + airdropPool.bIDAmount + airdropPool.cIDAmount + airdropPool.dIDAmount + airdropPool.eIDAmount + airdropPool.fIDAmount + airdropPool.gIDAmount + airdropPool.hIDAmount)) {
            tokenId = airdropPool.hID;
            airdropPool.hID = airdropPool.hID.add(1);
            airdropPool.hIDAmount = airdropPool.hIDAmount.sub(1);
        }

        airdropPool.allAmount = airdropPool.allAmount.sub(1);
        return tokenId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC721.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Receiver.sol";
import "../../introspection/ERC165.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../utils/EnumerableSet.sol";
import "../../utils/EnumerableMap.sol";
import "../../utils/Strings.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping (uint256 => string) private _tokenURIs;

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");

        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];

        // If there is no base URI, return the token URI.
        if (bytes(_baseURI).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(_baseURI, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(_baseURI, tokenId.toString()));
    }

    /**
    * @dev Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    function _approve(address to, uint256 tokenId) private {
        _tokenApprovals[tokenId] = to;
        emit Approval(ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
    external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
 * (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

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

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

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

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

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

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

            bytes32 lastvalue = set._values[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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


    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

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

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

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

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

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

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

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

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        return _get(map, key, "EnumerableMap: nonexistent key");
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(value)));
    }

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

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

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

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

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = byte(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./ERC721.sol";

/**
 * @title ERC721 Burnable Token
 * @dev ERC721 Token that can be irreversibly burned (destroyed).
 */
abstract contract ERC721Burnable is Context, ERC721 {
    /**
     * @dev Burns `tokenId`. See {ERC721-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
        _burn(tokenId);
    }
}

// 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 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;

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);
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol';
import '../owner/Operator.sol';

contract MockDai is ERC20Burnable, Operator {
    /**
     * @notice Constructs the OK Cash ERC-20 contract.
     */
    constructor() public ERC20('DAI', 'DAI') {
        _mint(msg.sender, 10000 * 10**18);
    }

    /**
     * @notice Operator mints dino cash to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of dino cash to mint to
     * @return whether the process has been done
     */
    function mint(address recipient_, uint256 amount_)
        public
        onlyOperator
        returns (bool)
    {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);

        return balanceAfter > balanceBefore;
    }
}

pragma solidity ^0.6.0;

import './owner/Operator.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol';

contract Share is ERC20Burnable, Operator {
    constructor() public ERC20('HCS', 'HCS') {
        // Mints 1 Hayek Share to contract creator for initial Uniswap oracle deployment.
        // Will be burned after oracle deployment
        _mint(msg.sender, 1 * 10**18);
    }

    /**
     * @notice Operator mints hayek cash to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of ok cash to mint to
     */
    function mint(address recipient_, uint256 amount_)
        public
        onlyOperator
        returns (bool)
    {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);
        return balanceAfter >= balanceBefore;
    }

    function burn(uint256 amount) public override onlyOperator {
        super.burn(amount);
    }

    function burnFrom(address account, uint256 amount)
        public
        override
        onlyOperator
    {
        super.burnFrom(account, amount);
    }
}

pragma solidity ^0.6.0;

import '@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol';
import './owner/Operator.sol';

contract Cash is ERC20Burnable, Operator {
    /**
     * @notice Constructs the Hayek Cash ERC-20 contract.
     */
    constructor() public ERC20('HCC', 'HCC') {
        // Mints 1 Hayek Cash to contract creator for initial Uniswap oracle deployment.
        // Will be burned after oracle deployment
        _mint(msg.sender, 1 * 10**18);
    }

    //    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override {
    //        super._beforeTokenTransfer(from, to, amount);
    //        require(
    //            to != operator(),
    //            "ok.cash: operator as a recipient is not allowed"
    //        );
    //    }

    /**
     * @notice Operator mints hayek cash to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of ok cash to mint to
     * @return whether the process has been done
     */
    function mint(address recipient_, uint256 amount_)
        public
        onlyOperator
        returns (bool)
    {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);

        return balanceAfter > balanceBefore;
    }

    function burn(uint256 amount) public override onlyOperator {
        super.burn(amount);
    }

    function burnFrom(address account, uint256 amount)
        public
        override
        onlyOperator
    {
        super.burnFrom(account, amount);
    }
}

pragma solidity ^0.6.0;

import "./owner/Operator.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";

contract Bond is ERC20Burnable, Ownable, Operator {
    /**
     * @notice Constructs the Hayek Bond ERC-20 contract.
     */
    constructor() public ERC20("HCB", "HCB") {}

    /**
     * @notice Operator mints hayek bonds to a recipient
     * @param recipient_ The address of recipient
     * @param amount_ The amount of ok bonds to mint to
     * @return whether the process has been done
     */
    function mint(address recipient_, uint256 amount_)
        public
        onlyOperator
        returns (bool)
    {
        uint256 balanceBefore = balanceOf(recipient_);
        _mint(recipient_, amount_);
        uint256 balanceAfter = balanceOf(recipient_);

        return balanceAfter > balanceBefore;
    }

    function burn(uint256 amount) public override onlyOperator {
        super.burn(amount);
    }

    function burnFrom(address account, uint256 amount)
        public
        override
        onlyOperator
    {
        super.burnFrom(account, amount);
    }
}

{
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000007859848dc721520d459f4ff319eb5b4432360d3c

-----Decoded View---------------
Arg [0] : _nftFeature (address): 0x7859848dc721520D459F4ff319eB5b4432360d3c

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000007859848dc721520d459f4ff319eb5b4432360d3c

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