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pragma solidity 0.6.7;

import "./../openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./../openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "./../openzeppelin/contracts/token/ERC721/IERC721.sol";
import "./../openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "./../openzeppelin/contracts/access/Ownable.sol";
import "./LighthouseTierInterface.sol";


/// @title RiverboatNft is a nft service platform
/// User can buy nft at a slots 1-5
/// In intervals of time slots are replenished and nft prices increase
/// @author Nejc Schneider
contract Riverboat is IERC721Receiver, Ownable {
    using SafeERC20 for IERC20;

    bool public tradeEnabled = true;   // enable/disable buy function
    uint256 public sessionId;          // current sessionId
    address private priceReceiver;     // this address receives the money from bought tokens
    address private verifier;          // address to verify digital signature against

    struct Session{
        address currencyAddress;            // currency address
        address nftAddress;                 // nft address used for sending
        address lighthouseTierAddress;      // address of LighthouseTier external contract
        uint256 startPrice;	                // nft price in the initial interval
        uint256 priceIncrease;		          // how much nftPrice increase every interval
        uint32 startTime;			              // session start timestamp
        uint32 intervalDuration;		        // duration of single interval – in seconds
        uint32 intervalsAmount;	            // total of intervals
        uint32 slotsAmount;                 // total of slots
    }

    /// @dev session id => Session struct
    mapping(uint256 => Session) public sessions;
    /// @dev keep track of sold nfts while session is active
    /// sessionId => intervalId => buyerAddress => bool
    mapping(uint256 => mapping(uint256 => mapping(address => bool))) public nftMinters;

    event Buy(
        uint256 indexed sessionId,
        uint256 intervalNumber,
        uint256 price,
        uint256 nftId,
        address indexed buyer
    );

    event StartSession(
        uint256 indexed sessionId,
        uint256 startPrice,
        uint256 priceIncrease,
        uint32 startTime,
        uint32 intervalDuration,
        uint32 intervalsAmount,
        uint32 slotsAmount,
        address nftAddress
    );

    event ApproveUnsoldNfts(
        uint256 indexed sessionId,
        address indexed nftAddress,
        address receiverAddress
    );

    /// @dev initialize the contract
    /// @param _priceReceiver recipient of the price during nft buy
    constructor(address _priceReceiver, address _verifier) public {
        require(_priceReceiver != address(0), "Invalid price receiver address");
        priceReceiver = _priceReceiver;
        require(_verifier != address(0), "Invalid verifier address");
        verifier = _verifier;
    }

    //--------------------------------------------------------------------
    //  external onlyOwner functions
    //--------------------------------------------------------------------

    /// @notice enable/disable buy function
    /// @param _tradeEnabled set tradeEnabled to true/false
    function enableTrade(bool _tradeEnabled) external onlyOwner {
        tradeEnabled = _tradeEnabled;
    }

    /// @notice change price receiver address
    /// @param _priceReceiver address of new receiver
    function setPriceReceiver(address _priceReceiver) external onlyOwner {
        require(_priceReceiver != address(0), "Invalid price receiver address");
        priceReceiver = _priceReceiver;
    }

    /// @notice change verifier address
    /// @param _verifier address of new verifier
    function setVerifier(address _verifier) external onlyOwner {
        require(_verifier != address(0), "Invalid verifier address");
        verifier = _verifier;
    }

    /// @dev start a new session, during which players are allowed to buy nfts
    /// @param _currencyAddress ERC20 token to be used during the session
    /// @param _nftAddress address of nft
    /// @param _lighthouseTierAddress tier contract address, if 0x0 tier is not requirement
    /// @param _startPrice nfts price in the first interval
    /// @param _priceIncrease how much price increases each interval
    /// @param _startTime timestamp at which session becomes active
    /// @param _intervalDuration duration of each interval
    /// @param _intervalsAmount how many intervals are in a session
    /// @param _slotsAmount amount of nft slots in a session
    function startSession(
        address _currencyAddress,
        address _nftAddress,
        address _lighthouseTierAddress,
        uint256 _startPrice,
        uint256 _priceIncrease,
        uint32 _startTime,
        uint32 _intervalDuration,
        uint32 _intervalsAmount,
        uint32 _slotsAmount
    )
        external
        onlyOwner
    {
        if (sessionId > 0)
            require(isFinished(sessionId), "last session hasnt finished yet");
        require(_currencyAddress != address(0), "invalid currency address");
        require(_nftAddress != address(0), "invalid nft address");
        require(_startPrice > 0, "start price can't be 0");
        require(_priceIncrease > 0, "price increase can't be 0");
        require(_startTime > now, "session should start in future");
        require(_intervalDuration > 0, "interval duration can't be 0");
        require(_intervalsAmount > 0, "intervals amount can't be 0");
        require(_slotsAmount > 0, "slots amount can't be 0");

        sessionId++;
        sessions[sessionId] = Session(
            _currencyAddress,
            _nftAddress,
            _lighthouseTierAddress,
            _startPrice,
            _priceIncrease,
            _startTime,
            _intervalDuration,
            _intervalsAmount,
            _slotsAmount
        );

        emit StartSession(
            sessionId,
            _startPrice,
            _priceIncrease,
            _startTime,
            _intervalDuration,
            _intervalsAmount,
            _slotsAmount,
            _nftAddress
        );
    }

    /// @dev after session is finished owner can approve withdrawal of remaining nfts
    /// @param _sessionId session unique identifier
    /// @param _receiverAddress address which will receive the nfts
    function approveUnsoldNfts(uint256 _sessionId, address _receiverAddress)
        external
        onlyOwner
    {
        require(_receiverAddress != address(0), "invalid receiver address");
        require(isFinished(_sessionId), "sesson needs to be finished");
        IERC721(sessions[_sessionId].nftAddress).setApprovalForAll(_receiverAddress, true);

        emit ApproveUnsoldNfts(_sessionId, sessions[_sessionId].nftAddress, _receiverAddress);
    }

    //--------------------------------------------------------------------
    // External functions
    //--------------------------------------------------------------------

    /// @notice buy nft at selected slot
    /// @param _sessionId session unique identifier
    /// @param _nftId id of nft
    function buy(uint256 _sessionId, uint256 _nftId, uint8 _v, bytes32 _r, bytes32 _s) external {
        Session storage _session = sessions[_sessionId];
        //require stamements
        uint256 _currentInterval = getCurrentInterval(_sessionId);
        uint256 _currentPrice = getCurrentPrice(_sessionId, _currentInterval);
        require(IERC721(_session.nftAddress).ownerOf(_nftId) == address(this),
            "contract not owner of this nft");
        require(!nftMinters[_sessionId][_currentInterval][msg.sender],
            "cant buy more nfts per interval");
        require(tradeEnabled, "trade is disabled");

        /// @dev make sure msg.sender has obtained tier in LighthouseTier.sol
        /// LighthouseTier.sol is external but trusted contract maintained by Seascape
        if(_session.lighthouseTierAddress != address(0)){
            LighthouseTierInterface tier = LighthouseTierInterface(_session
                .lighthouseTierAddress);
            require(tier.getTierLevel(msg.sender) > -1, "tier rank 0-4 is required");
        }

        /// @dev digital signature part
        bytes32 _messageNoPrefix = keccak256(abi.encodePacked(
            _sessionId,
            _nftId,
            _currentInterval,
            getChainId(),
            _currentPrice,
            address(this),
            _session.currencyAddress,
            _session.nftAddress
        ));
        bytes32 _message = keccak256(abi.encodePacked(
            "\x19Ethereum Signed Message:\n32", _messageNoPrefix));
        address _recover = ecrecover(_message, _v, _r, _s);
        require(_recover == verifier,  "Verification failed");

        // update state
        nftMinters[_sessionId][_currentInterval][msg.sender] = true;

        /// make transactions
        IERC20(_session.currencyAddress).safeTransferFrom(msg.sender, priceReceiver, _currentPrice);
        IERC721(_session.nftAddress).safeTransferFrom(address(this), msg.sender, _nftId);

        /// emit events
        emit Buy(
          _sessionId,
          _currentInterval,
          _currentPrice,
          _nftId,
          msg.sender
        );
    }

    /// @dev encrypt token data
    /// @return encrypted data
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    )
        external
        override
        returns (bytes4)
    {
        return bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"));
    }

    /// @notice get remaining time in current interval
    /// @param _sessionId session unique identifier
    /// @return time in seconds
    function getIntervalTime(uint256 _sessionId) external view returns(uint) {
        if(!isActive(_sessionId)) {
            return 0;
        } else {
            return (now - sessions[_sessionId]
              .startTime) % sessions[_sessionId].intervalDuration;
        }
    }

    //--------------------------------------------------------------------
    // public functions
    //--------------------------------------------------------------------

    /// @dev calculate current interval number
    /// @param _sessionId session unique identifier
    /// @return current interval number
    function getCurrentInterval(uint256 _sessionId) public view returns(uint) {
        require(isActive(_sessionId), "session is not active");
        uint256 _currentInterval = (now - sessions[_sessionId]
            .startTime) / sessions[_sessionId].intervalDuration;
        // @dev _currentInterval will start with 0 so last interval should be intervalsAmoun-1
        require(_currentInterval < sessions[_sessionId].intervalsAmount,
            "_currentInterval > intervalsAmount, session is finished");
        return _currentInterval;
    }

    /// @dev calculate current nft price
    /// @param _sessionId session unique identifier
    /// @param _currentInterval number of the current interval
    /// @return nft price for the current interval
    function getCurrentPrice(uint256 _sessionId, uint256 _currentInterval)
        public
        view
        returns (uint)
    {
        // if _currentInterval = 0, session.startPrice will be returned
        uint256 _currentPrice = sessions[_sessionId].startPrice + sessions[_sessionId]
            .priceIncrease * _currentInterval;
        return _currentPrice;
    }

    /// @dev check if session is currently active
    /// @param _sessionId id to verify
    /// @return true/false depending on timestamp period of the sesson
    function isActive(uint256 _sessionId) internal view returns (bool){
        Session storage session = sessions[_sessionId];
        if(now >= session.startTime && now < session
            .startTime + session.intervalsAmount * session.intervalDuration){
            return true;
        }
        return false;
    }

    /// @dev check if session is already finished
    /// @param _sessionId id to verify
    /// @return true if session is finished
    function isFinished(uint256 _sessionId) internal view returns (bool){
        Session memory session = sessions[_sessionId];
        if(now > session.startTime + session.intervalsAmount * session.intervalDuration)
            return true;
        return false;
    }

    //--------------------------------------------------------------------
    // private functions
    //--------------------------------------------------------------------

    /// @dev retrieve executing chain id
    /// @return network identifier
    function getChainId() public pure returns (uint256) {
        uint256 id;
        assembly {
            id := chainid()
        }
        return id;
    }

}

pragma solidity ^0.6.7;


/// @dev Interface of the nftSwapParams

interface LighthouseTierInterface {

    /// @dev returns investors tier rank 0 - 4; -1 if none
    function getTierLevel(address _investor) external view returns (int8);

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/**
 * @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 ^0.6.2;

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

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transfered 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 ^0.6.0;

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");
        }
    }
}

// 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;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

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

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

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

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

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

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

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

// SPDX-License-Identifier: 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;
    }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000004f1dcb7928ef25a6225ee16fdb76f7da6b7e925d00000000000000000000000055053faefda821cba5333c80151f3b52d019a80b

-----Decoded View---------------
Arg [0] : _priceReceiver (address): 0x4F1DCB7928Ef25A6225eE16FDB76f7dA6B7E925D
Arg [1] : _verifier (address): 0x55053FAefdA821Cba5333c80151F3b52D019a80B

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000004f1dcb7928ef25a6225ee16fdb76f7da6b7e925d
Arg [1] : 00000000000000000000000055053faefda821cba5333c80151f3b52d019a80b