PowPandas

/**
 *Submitted for verification at Etherscan.io on 2018-09-02
*/

pragma solidity ^0.4.24;

contract ERC721Basic {
    event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
    event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);
    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

    function balanceOf(address _owner) public view returns (uint256 _balance);

    function ownerOf(uint256 _tokenId) public view returns (address _owner);

    function exists(uint256 _tokenId) public view returns (bool _exists);

    function approve(address _to, uint256 _tokenId) public;

    function getApproved(uint256 _tokenId) public view returns (address _operator);

    function setApprovalForAll(address _operator, bool _approved) public;

    function isApprovedForAll(address _owner, address _operator) public view returns (bool);

    function transferFrom(address _from, address _to, uint256 _tokenId) public;

    function safeTransferFrom(address _from, address _to, uint256 _tokenId) public;

    //    function safeTransferFrom(
    //        address _from,
    //        address _to,
    //        uint256 _tokenId,
    //        bytes _data
    //    )
    //    public;
}

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Enumerable is ERC721Basic {
    function totalSupply() public view returns (uint256);

    function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256 _tokenId);

    function tokenByIndex(uint256 _index) public view returns (uint256);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Metadata is ERC721Basic {
    function name() public view returns (string _name);

    function symbol() public view returns (string _symbol);

    function tokenURI(uint256 _tokenId) public view returns (string);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, full implementation interface
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}

contract ToonInterface is ERC721 {

    function isToonInterface() external pure returns (bool);

    /**
    * @notice   Returns an address of the toon author. 0x0 if
    *           the toon has been created by us.
    */
    function authorAddress() external view returns (address);

    /**
    * @notice   Returns maximum supply. In other words there will
    *           be never more toons that that number. It has to
    *           be constant.
    *           If there is no limit function returns 0.
    */
    function maxSupply() external view returns (uint256);

    function getToonInfo(uint _id) external view returns (
        uint genes,
        uint birthTime,
        address owner
    );

}

contract Ownable {
    address public owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor() public {
        owner = msg.sender;
    }


    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }


    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }

}

contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;


    /**
     * @dev modifier to allow actions only when the contract IS paused
     */
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    /**
     * @dev modifier to allow actions only when the contract IS NOT paused
     */
    modifier whenPaused {
        require(paused);
        _;
    }

    /**
     * @dev called by the owner to pause, triggers stopped state
     */
    function pause() public onlyOwner whenNotPaused returns (bool) {
        paused = true;
        emit Pause();
        return true;
    }

    /**
     * @dev called by the owner to unpause, returns to normal state
     */
    function unpause() public onlyOwner whenPaused returns (bool) {
        paused = false;
        emit Unpause();
        return true;
    }
}

contract Withdrawable {

    mapping(address => uint) private pendingWithdrawals;

    event Withdrawal(address indexed receiver, uint amount);
    event BalanceChanged(address indexed _address, uint oldBalance, uint newBalance);

    /**
    * Returns amount of wei that given address is able to withdraw.
    */
    function getPendingWithdrawal(address _address) public view returns (uint) {
        return pendingWithdrawals[_address];
    }

    /**
    * Add pending withdrawal for an address.
    */
    function addPendingWithdrawal(address _address, uint _amount) internal {
        require(_address != 0x0);

        uint oldBalance = pendingWithdrawals[_address];
        pendingWithdrawals[_address] += _amount;

        emit BalanceChanged(_address, oldBalance, oldBalance + _amount);
    }

    /**
    * Withdraws all pending withdrawals.
    */
    function withdraw() external {
        uint amount = getPendingWithdrawal(msg.sender);
        require(amount > 0);

        pendingWithdrawals[msg.sender] = 0;
        msg.sender.transfer(amount);

        emit Withdrawal(msg.sender, amount);
        emit BalanceChanged(msg.sender, amount, 0);
    }

}

contract ClockAuctionBase is Withdrawable, Pausable {

    // Represents an auction on an NFT
    struct Auction {
        // Address of a contract
        address _contract;
        // Current owner of NFT
        address seller;
        // Price (in wei) at beginning of auction
        uint128 startingPrice;
        // Price (in wei) at end of auction
        uint128 endingPrice;
        // Duration (in seconds) of auction
        uint64 duration;
        // Time when auction started
        // NOTE: 0 if this auction has been concluded
        uint64 startedAt;
    }

    // Reference to contract tracking NFT ownership
    ToonInterface[] public toonContracts;
    mapping(address => uint256) addressToIndex;

    // Cut owner takes on each auction, measured in basis points (1/100 of a percent).
    // Values 0-10,000 map to 0%-100%
    uint256 public ownerCut;

    // Values 0-10,000 map to 0%-100%
    // Author's share from the owner cut.
    uint256 public authorShare;

    // Map from token ID to their corresponding auction.
    //    mapping(uint256 => Auction) tokenIdToAuction;
    mapping(address => mapping(uint256 => Auction)) tokenToAuction;

    event AuctionCreated(address indexed _contract, uint256 indexed tokenId,
        uint256 startingPrice, uint256 endingPrice, uint256 duration);
    event AuctionSuccessful(address indexed _contract, uint256 indexed tokenId,
        uint256 totalPrice, address indexed winner);
    event AuctionCancelled(address indexed _contract, uint256 indexed tokenId);

    /**
    * @notice   Adds a new toon contract.
    */
    function addToonContract(address _toonContractAddress) external onlyOwner {
        ToonInterface _interface = ToonInterface(_toonContractAddress);
        require(_interface.isToonInterface());

        uint _index = toonContracts.push(_interface) - 1;
        addressToIndex[_toonContractAddress] = _index;
    }

    /// @dev Returns true if the claimant owns the token.
    /// @param _contract - address of a toon contract
    /// @param _claimant - Address claiming to own the token.
    /// @param _tokenId - ID of token whose ownership to verify.
    function _owns(address _contract, address _claimant, uint256 _tokenId)
    internal
    view
    returns (bool) {
        ToonInterface _interface = _interfaceByAddress(_contract);
        address _owner = _interface.ownerOf(_tokenId);

        return (_owner == _claimant);
    }

    /// @dev Escrows the NFT, assigning ownership to this contract.
    /// Throws if the escrow fails.
    /// @param _owner - Current owner address of token to escrow.
    /// @param _tokenId - ID of token whose approval to verify.
    function _escrow(address _contract, address _owner, uint256 _tokenId) internal {
        ToonInterface _interface = _interfaceByAddress(_contract);
        // it will throw if transfer fails
        _interface.transferFrom(_owner, this, _tokenId);
    }

    /// @dev Transfers an NFT owned by this contract to another address.
    /// Returns true if the transfer succeeds.
    /// @param _receiver - Address to transfer NFT to.
    /// @param _tokenId - ID of token to transfer.
    function _transfer(address _contract, address _receiver, uint256 _tokenId) internal {
        ToonInterface _interface = _interfaceByAddress(_contract);
        // it will throw if transfer fails
        _interface.transferFrom(this, _receiver, _tokenId);
    }

    /// @dev Adds an auction to the list of open auctions. Also fires the
    ///  AuctionCreated event.
    /// @param _tokenId The ID of the token to be put on auction.
    /// @param _auction Auction to add.
    function _addAuction(address _contract, uint256 _tokenId, Auction _auction) internal {
        // Require that all auctions have a duration of
        // at least one minute. (Keeps our math from getting hairy!)
        require(_auction.duration >= 1 minutes);

        _isAddressSupportedContract(_contract);
        tokenToAuction[_contract][_tokenId] = _auction;

        emit AuctionCreated(
            _contract,
            uint256(_tokenId),
            uint256(_auction.startingPrice),
            uint256(_auction.endingPrice),
            uint256(_auction.duration)
        );
    }

    /// @dev Cancels an auction unconditionally.
    function _cancelAuction(address _contract, uint256 _tokenId, address _seller) internal {
        _removeAuction(_contract, _tokenId);
        _transfer(_contract, _seller, _tokenId);
        emit AuctionCancelled(_contract, _tokenId);
    }

    /// @dev Computes the price and transfers winnings.
    /// Does NOT transfer ownership of token.
    function _bid(address _contract, uint256 _tokenId, uint256 _bidAmount)
    internal
    returns (uint256)
    {
        // Get a reference to the auction struct
        Auction storage auction = tokenToAuction[_contract][_tokenId];
        ToonInterface _interface = _interfaceByAddress(auction._contract);

        // Explicitly check that this auction is currently live.
        // (Because of how Ethereum mappings work, we can't just count
        // on the lookup above failing. An invalid _tokenId will just
        // return an auction object that is all zeros.)
        require(_isOnAuction(auction));

        // Check that the bid is greater than or equal to the current price
        uint256 price = _currentPrice(auction);
        require(_bidAmount >= price);

        // Grab a reference to the seller before the auction struct
        // gets deleted.
        address seller = auction.seller;

        // The bid is good! Remove the auction before sending the fees
        // to the sender so we can't have a reentrancy attack.
        _removeAuction(_contract, _tokenId);

        // Transfer proceeds to seller (if there are any!)
        if (price > 0) {
            // Calculate the auctioneer's cut.
            // (NOTE: _computeCut() is guaranteed to return a
            // value <= price, so this subtraction can't go negative.)
            uint256 auctioneerCut;
            uint256 authorCut;
            uint256 sellerProceeds;
            (auctioneerCut, authorCut, sellerProceeds) = _computeCut(_interface, price);

            if (authorCut > 0) {
                address authorAddress = _interface.authorAddress();
                addPendingWithdrawal(authorAddress, authorCut);
            }

            addPendingWithdrawal(owner, auctioneerCut);

            // NOTE: Doing a transfer() in the middle of a complex
            // method like this is generally discouraged because of
            // reentrancy attacks and DoS attacks if the seller is
            // a contract with an invalid fallback function. We explicitly
            // guard against reentrancy attacks by removing the auction
            // before calling transfer(), and the only thing the seller
            // can DoS is the sale of their own asset! (And if it's an
            // accident, they can call cancelAuction(). )
            seller.transfer(sellerProceeds);
        }

        // Calculate any excess funds included with the bid. If the excess
        // is anything worth worrying about, transfer it back to bidder.
        // NOTE: We checked above that the bid amount is greater than or
        // equal to the price so this cannot underflow.
        uint256 bidExcess = _bidAmount - price;

        // Return the funds. Similar to the previous transfer, this is
        // not susceptible to a re-entry attack because the auction is
        // removed before any transfers occur.
        msg.sender.transfer(bidExcess);

        // Tell the world!
        emit AuctionSuccessful(_contract, _tokenId, price, msg.sender);

        return price;
    }

    /// @dev Removes an auction from the list of open auctions.
    /// @param _tokenId - ID of NFT on auction.
    function _removeAuction(address _contract, uint256 _tokenId) internal {
        delete tokenToAuction[_contract][_tokenId];
    }

    /// @dev Returns true if the NFT is on auction.
    /// @param _auction - Auction to check.
    function _isOnAuction(Auction storage _auction) internal view returns (bool) {
        return (_auction.startedAt > 0);
    }

    /// @dev Returns current price of an NFT on auction. Broken into two
    ///  functions (this one, that computes the duration from the auction
    ///  structure, and the other that does the price computation) so we
    ///  can easily test that the price computation works correctly.
    function _currentPrice(Auction storage _auction)
    internal
    view
    returns (uint256)
    {
        uint256 secondsPassed = 0;

        // A bit of insurance against negative values (or wraparound).
        // Probably not necessary (since Ethereum guarnatees that the
        // now variable doesn't ever go backwards).
        if (now > _auction.startedAt) {
            secondsPassed = now - _auction.startedAt;
        }

        return _computeCurrentPrice(
            _auction.startingPrice,
            _auction.endingPrice,
            _auction.duration,
            secondsPassed
        );
    }

    /// @dev Computes the current price of an auction. Factored out
    ///  from _currentPrice so we can run extensive unit tests.
    ///  When testing, make this function public and turn on
    ///  `Current price computation` test suite.
    function _computeCurrentPrice(
        uint256 _startingPrice,
        uint256 _endingPrice,
        uint256 _duration,
        uint256 _secondsPassed
    )
    internal
    pure
    returns (uint256)
    {
        // NOTE: We don't use SafeMath (or similar) in this function because
        //  all of our public functions carefully cap the maximum values for
        //  time (at 64-bits) and currency (at 128-bits). _duration is
        //  also known to be non-zero (see the require() statement in
        //  _addAuction())
        if (_secondsPassed >= _duration) {
            // We've reached the end of the dynamic pricing portion
            // of the auction, just return the end price.
            return _endingPrice;
        } else {
            // Starting price can be higher than ending price (and often is!), so
            // this delta can be negative.
            int256 totalPriceChange = int256(_endingPrice) - int256(_startingPrice);

            // This multiplication can't overflow, _secondsPassed will easily fit within
            // 64-bits, and totalPriceChange will easily fit within 128-bits, their product
            // will always fit within 256-bits.
            int256 currentPriceChange = totalPriceChange * int256(_secondsPassed) / int256(_duration);

            // currentPriceChange can be negative, but if so, will have a magnitude
            // less that _startingPrice. Thus, this result will always end up positive.
            int256 currentPrice = int256(_startingPrice) + currentPriceChange;

            return uint256(currentPrice);
        }
    }

    /// @dev Computes owner's cut of a sale.
    /// @param _price - Sale price of NFT.
    function _computeCut(ToonInterface _interface, uint256 _price) internal view returns (
        uint256 ownerCutValue,
        uint256 authorCutValue,
        uint256 sellerProceeds
    ) {
        // NOTE: We don't use SafeMath (or similar) in this function because
        //  all of our entry functions carefully cap the maximum values for
        //  currency (at 128-bits), and ownerCut <= 10000 (see the require()
        //  statement in the ClockAuction constructor). The result of this
        //  function is always guaranteed to be <= _price.

        uint256 _totalCut = _price * ownerCut / 10000;
        uint256 _authorCut = 0;
        uint256 _ownerCut = 0;
        if (_interface.authorAddress() != 0x0) {
            _authorCut = _totalCut * authorShare / 10000;
        }

        _ownerCut = _totalCut - _authorCut;
        uint256 _sellerProfit = _price - _ownerCut - _authorCut;
        require(_sellerProfit + _ownerCut + _authorCut == _price);

        return (_ownerCut, _authorCut, _sellerProfit);
    }

    function _interfaceByAddress(address _address) internal view returns (ToonInterface) {
        uint _index = addressToIndex[_address];
        ToonInterface _interface = toonContracts[_index];
        require(_address == address(_interface));

        return _interface;
    }

    function _isAddressSupportedContract(address _address) internal view returns (bool) {
        uint _index = addressToIndex[_address];
        ToonInterface _interface = toonContracts[_index];
        return _address == address(_interface);
    }
}

contract ClockAuction is ClockAuctionBase {

    /// @dev The ERC-165 interface signature for ERC-721.
    ///  Ref: https://github.com/ethereum/EIPs/issues/165
    ///  Ref: https://github.com/ethereum/EIPs/issues/721
    bytes4 constant InterfaceSignature_ERC721 = bytes4(0x9a20483d);

    bool public isSaleClockAuction = true;

    /// @dev Constructor creates a reference to the NFT ownership contract
    ///  and verifies the owner cut is in the valid range.
    /// @param _ownerCut - percent cut the owner takes on each auction, must be
    ///  between 0-10,000.
    /// @param _authorShare - percent share of the author of the toon.
    ///  Calculated from the ownerCut
    constructor(uint256 _ownerCut, uint256 _authorShare) public {
        require(_ownerCut <= 10000);
        require(_authorShare <= 10000);

        ownerCut = _ownerCut;
        authorShare = _authorShare;
    }

    /// @dev Creates and begins a new auction.
    /// @param _tokenId - ID of token to auction, sender must be owner.
    /// @param _startingPrice - Price of item (in wei) at beginning of auction.
    /// @param _endingPrice - Price of item (in wei) at end of auction.
    /// @param _duration - Length of time to move between starting
    ///  price and ending price (in seconds).
    /// @param _seller - Seller, if not the message sender
    function createAuction(
        address _contract,
        uint256 _tokenId,
        uint256 _startingPrice,
        uint256 _endingPrice,
        uint256 _duration,
        address _seller
    )
    external
    whenNotPaused
    {
        require(_isAddressSupportedContract(_contract));
        // Sanity check that no inputs overflow how many bits we've allocated
        // to store them in the auction struct.
        require(_startingPrice == uint256(uint128(_startingPrice)));
        require(_endingPrice == uint256(uint128(_endingPrice)));
        require(_duration == uint256(uint64(_duration)));

        _escrow(_contract, _seller, _tokenId);

        Auction memory auction = Auction(
            _contract,
            _seller,
            uint128(_startingPrice),
            uint128(_endingPrice),
            uint64(_duration),
            uint64(now)
        );
        _addAuction(_contract, _tokenId, auction);
    }

    /// @dev Bids on an open auction, completing the auction and transferring
    ///  ownership of the NFT if enough Ether is supplied.
    /// @param _tokenId - ID of token to bid on.
    function bid(address _contract, uint256 _tokenId)
    external
    payable
    whenNotPaused
    {
        // _bid will throw if the bid or funds transfer fails
        _bid(_contract, _tokenId, msg.value);
        _transfer(_contract, msg.sender, _tokenId);
    }

    /// @dev Cancels an auction that hasn't been won yet.
    ///  Returns the NFT to original owner.
    /// @notice This is a state-modifying function that can
    ///  be called while the contract is paused.
    /// @param _tokenId - ID of token on auction
    function cancelAuction(address _contract, uint256 _tokenId)
    external
    {
        Auction storage auction = tokenToAuction[_contract][_tokenId];
        require(_isOnAuction(auction));
        address seller = auction.seller;
        require(msg.sender == seller);
        _cancelAuction(_contract, _tokenId, seller);
    }

    /// @dev Cancels an auction when the contract is paused.
    ///  Only the owner may do this, and NFTs are returned to
    ///  the seller. This should only be used in emergencies.
    /// @param _tokenId - ID of the NFT on auction to cancel.
    function cancelAuctionWhenPaused(address _contract, uint256 _tokenId)
    whenPaused
    onlyOwner
    external
    {
        Auction storage auction = tokenToAuction[_contract][_tokenId];
        require(_isOnAuction(auction));
        _cancelAuction(_contract, _tokenId, auction.seller);
    }

    /// @dev Returns auction info for an NFT on auction.
    /// @param _tokenId - ID of NFT on auction.
    function getAuction(address _contract, uint256 _tokenId)
    external
    view
    returns
    (
        address seller,
        uint256 startingPrice,
        uint256 endingPrice,
        uint256 duration,
        uint256 startedAt,
        uint256 currentPrice
    ) {
        Auction storage auction = tokenToAuction[_contract][_tokenId];

        if (!_isOnAuction(auction)) {
            return (0x0, 0, 0, 0, 0, 0);
        }

        return (
        auction.seller,
        auction.startingPrice,
        auction.endingPrice,
        auction.duration,
        auction.startedAt,
        getCurrentPrice(_contract, _tokenId)
        );
    }

    /// @dev Returns the current price of an auction.
    /// @param _tokenId - ID of the token price we are checking.
    function getCurrentPrice(address _contract, uint256 _tokenId)
    public
    view
    returns (uint256)
    {
        Auction storage auction = tokenToAuction[_contract][_tokenId];
        require(_isOnAuction(auction));
        return _currentPrice(auction);
    }

}



contract AccessControl is Ownable {
    // This facet controls access control for CryptoKitties. There are four roles managed here:
    //
    //     - The CEO: The CEO can reassign other roles and change the addresses of our dependent smart
    //         contracts. It is also the only role that can unpause the smart contract. It is initially
    //         set to the address that created the smart contract in the KittyCore constructor.
    //
    //     - The CFO: The CFO can withdraw funds from KittyCore and its auction contracts.
    //
    //     - The COO: The COO can release gen0 kitties to auction, and mint promo cats.
    //
    // It should be noted that these roles are distinct without overlap in their access abilities, the
    // abilities listed for each role above are exhaustive. In particular, while the CEO can assign any
    // address to any role, the CEO address itself doesn't have the ability to act in those roles. This
    // restriction is intentional so that we aren't tempted to use the CEO address frequently out of
    // convenience. The less we use an address, the less likely it is that we somehow compromise the
    // account.

    // The addresses of the accounts (or contracts) that can execute actions within each roles.
    address public ceoAddress;
    address public cfoAddress;
    address public cooAddress;

    // @dev Keeps track whether the contract is paused. When that is true, most actions are blocked
    bool public paused = false;

    /// @dev Access modifier for CEO-only functionality
    modifier onlyCEO() {
        require(msg.sender == ceoAddress);
        _;
    }

    /// @dev Access modifier for CFO-only functionality
    modifier onlyCFO() {
        require(msg.sender == cfoAddress);
        _;
    }

    /// @dev Access modifier for COO-only functionality
    modifier onlyCOO() {
        require(msg.sender == cooAddress);
        _;
    }

    modifier onlyCLevel() {
        require(
            msg.sender == cooAddress ||
            msg.sender == ceoAddress ||
            msg.sender == cfoAddress
        );
        _;
    }

    constructor() public {
        ceoAddress = owner;
        cfoAddress = owner;
        cooAddress = owner;
    }

    /// @dev Assigns a new address to act as the CEO. Only available to the current CEO.
    /// @param _newCEO The address of the new CEO
    function setCEO(address _newCEO) external onlyCEO {
        require(_newCEO != address(0));

        ceoAddress = _newCEO;
    }

    /// @dev Assigns a new address to act as the CFO. Only available to the current CEO.
    /// @param _newCFO The address of the new CFO
    function setCFO(address _newCFO) external onlyCEO {
        require(_newCFO != address(0));

        cfoAddress = _newCFO;
    }

    /// @dev Assigns a new address to act as the COO. Only available to the current CEO.
    /// @param _newCOO The address of the new COO
    function setCOO(address _newCOO) external onlyCEO {
        require(_newCOO != address(0));

        cooAddress = _newCOO;
    }

    /*** Pausable functionality adapted from OpenZeppelin ***/

    /// @dev Modifier to allow actions only when the contract IS NOT paused
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    /// @dev Modifier to allow actions only when the contract IS paused
    modifier whenPaused {
        require(paused);
        _;
    }

    /// @dev Called by any "C-level" role to pause the contract. Used only when
    ///  a bug or exploit is detected and we need to limit damage.
    function pause() external onlyCLevel whenNotPaused {
        paused = true;
    }

    /// @dev Unpauses the smart contract. Can only be called by the CEO, since
    ///  one reason we may pause the contract is when CFO or COO accounts are
    ///  compromised.
    /// @notice This is public rather than external so it can be called by
    ///  derived contracts.
    function unpause() public onlyCEO whenPaused {
        // can't unpause if contract was upgraded
        paused = false;
    }
}

interface ERC165 {
    /// @notice Query if a contract implements an interface
    /// @param interfaceID The interface identifier, as specified in ERC-165
    /// @dev Interface identification is specified in ERC-165. This function
    ///  uses less than 30,000 gas.
    /// @return `true` if the contract implements `interfaceID` and
    ///  `interfaceID` is not 0xffffffff, `false` otherwise
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}

contract ERC165MappingImplementation is ERC165 {
    /// @dev You must not set element 0xffffffff to true
    mapping(bytes4 => bool) internal supportedInterfaces;

    constructor() internal {
        supportedInterfaces[this.supportsInterface.selector] = true;
    }

    function supportsInterface(bytes4 interfaceID) external view returns (bool) {
        return supportedInterfaces[interfaceID];
    }
}

library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        // uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return a / b;
    }

    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }

    function toString(uint i) internal pure returns (string){
        if (i == 0) return "0";
        uint j = i;
        uint length;
        while (j != 0){
            length++;
            j /= 10;
        }
        bytes memory bstr = new bytes(length);
        uint k = length - 1;
        while (i != 0){
            bstr[k--] = byte(48 + i % 10);
            i /= 10;
        }
        return string(bstr);
    }

}

library AddressUtils {

    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     *  as the code is not actually created until after the constructor finishes.
     * @param addr address to check
     * @return whether the target address is a contract
     */
    function isContract(address addr) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        assembly { size := extcodesize(addr) }  // solium-disable-line security/no-inline-assembly
        return size > 0;
    }

}

contract ERC721Receiver {
    /**
     * @dev Magic value to be returned upon successful reception of an NFT
     *  Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`,
     *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
     */
    bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;

    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     *  after a `safetransfer`. This function MAY throw to revert and reject the
     *  transfer. This function MUST use 50,000 gas or less. Return of other
     *  than the magic value MUST result in the transaction being reverted.
     *  Note: the contract address is always the message sender.
     * @param _from The sending address
     * @param _tokenId The NFT identifier which is being transfered
     * @param _data Additional data with no specified format
     * @return `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
     */
    function onERC721Received(address _from, uint256 _tokenId, bytes _data) public returns(bytes4);
}

contract ERC721BasicToken is ERC721Basic, ERC165MappingImplementation {
    using SafeMath for uint256;
    using AddressUtils for address;

    // Equals to `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`
    // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
    bytes4 constant ERC721_RECEIVED = 0xf0b9e5ba;

    // Mapping from token ID to owner
    mapping(uint256 => address) internal tokenOwner;

    // Mapping from token ID to approved address
    mapping(uint256 => address) internal tokenApprovals;

    // Mapping from owner to number of owned token
    mapping(address => uint256) internal ownedTokensCount;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) internal operatorApprovals;

    /**
     * @dev Guarantees msg.sender is owner of the given token
     * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
     */
    modifier onlyOwnerOf(uint256 _tokenId) {
        require(ownerOf(_tokenId) == msg.sender);
        _;
    }

    constructor() public {
        supportedInterfaces[0x80ac58cd] = true;
    }

    /**
     * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
     * @param _tokenId uint256 ID of the token to validate
     */
    modifier canTransfer(uint256 _tokenId) {
        require(isApprovedOrOwner(msg.sender, _tokenId));
        _;
    }

    /**
     * @dev Gets the balance of the specified address
     * @param _owner address to query the balance of
     * @return uint256 representing the amount owned by the passed address
     */
    function balanceOf(address _owner) public view returns (uint256) {
        require(_owner != address(0));
        return ownedTokensCount[_owner];
    }

    /**
     * @dev Gets the owner of the specified token ID
     * @param _tokenId uint256 ID of the token to query the owner of
     * @return owner address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 _tokenId) public view returns (address) {
        address owner = tokenOwner[_tokenId];
        require(owner != address(0));
        return owner;
    }

    /**
     * @dev Returns whether the specified token exists
     * @param _tokenId uint256 ID of the token to query the existence of
     * @return whether the token exists
     */
    function exists(uint256 _tokenId) public view returns (bool) {
        address owner = tokenOwner[_tokenId];
        return owner != address(0);
    }

    /**
     * @dev Approves another address to transfer the given token ID
     * @dev The zero address indicates there is no approved address.
     * @dev There can only be one approved address per token at a given time.
     * @dev Can only be called by the token owner or an approved operator.
     * @param _to address to be approved for the given token ID
     * @param _tokenId uint256 ID of the token to be approved
     */
    function approve(address _to, uint256 _tokenId) public {
        address owner = ownerOf(_tokenId);
        require(_to != owner);
        require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

        if (getApproved(_tokenId) != address(0) || _to != address(0)) {
            tokenApprovals[_tokenId] = _to;
            emit Approval(owner, _to, _tokenId);
        }
    }

    /**
     * @dev Gets the approved address for a token ID, or zero if no address set
     * @param _tokenId uint256 ID of the token to query the approval of
     * @return address currently approved for the given token ID
     */
    function getApproved(uint256 _tokenId) public view returns (address) {
        return tokenApprovals[_tokenId];
    }

    /**
     * @dev Sets or unsets the approval of a given operator
     * @dev An operator is allowed to transfer all tokens of the sender on their behalf
     * @param _to operator address to set the approval
     * @param _approved representing the status of the approval to be set
     */
    function setApprovalForAll(address _to, bool _approved) public {
        require(_to != msg.sender);
        operatorApprovals[msg.sender][_to] = _approved;
        emit ApprovalForAll(msg.sender, _to, _approved);
    }

    /**
     * @dev Tells whether an operator is approved by a given owner
     * @param _owner owner address which you want to query the approval of
     * @param _operator operator address which you want to query the approval of
     * @return bool whether the given operator is approved by the given owner
     */
    function isApprovedForAll(address _owner, address _operator) public view returns (bool) {
        return operatorApprovals[_owner][_operator];
    }

    /**
     * @dev Transfers the ownership of a given token ID to another address
     * @dev Usage of this method is discouraged, use `safeTransferFrom` whenever possible
     * @dev Requires the msg sender to be the owner, approved, or operator
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenId uint256 ID of the token to be transferred
    */
    function transferFrom(address _from, address _to, uint256 _tokenId) public canTransfer(_tokenId) {
        require(_from != address(0));
        require(_to != address(0));

        clearApproval(_from, _tokenId);
        removeTokenFrom(_from, _tokenId);
        addTokenTo(_to, _tokenId);

        emit Transfer(_from, _to, _tokenId);
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * @dev If the target address is a contract, it must implement `onERC721Received`,
     *  which is called upon a safe transfer, and return the magic value
     *  `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
     *  the transfer is reverted.
     * @dev Requires the msg sender to be the owner, approved, or operator
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenId uint256 ID of the token to be transferred
    */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    )
    public
    canTransfer(_tokenId)
    {
        // solium-disable-next-line arg-overflow
        safeTransferFrom(_from, _to, _tokenId, "");
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * @dev If the target address is a contract, it must implement `onERC721Received`,
     *  which is called upon a safe transfer, and return the magic value
     *  `bytes4(keccak256("onERC721Received(address,uint256,bytes)"))`; otherwise,
     *  the transfer is reverted.
     * @dev Requires the msg sender to be the owner, approved, or operator
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes _data
    )
    public
    canTransfer(_tokenId)
    {
        transferFrom(_from, _to, _tokenId);
        // solium-disable-next-line arg-overflow
        require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
    }

    /**
     * @dev Returns whether the given spender can transfer a given token ID
     * @param _spender address of the spender to query
     * @param _tokenId uint256 ID of the token to be transferred
     * @return bool whether the msg.sender is approved for the given token ID,
     *  is an operator of the owner, or is the owner of the token
     */
    function isApprovedOrOwner(address _spender, uint256 _tokenId) internal view returns (bool) {
        address owner = ownerOf(_tokenId);
        return _spender == owner || getApproved(_tokenId) == _spender || isApprovedForAll(owner, _spender);
    }

    /**
     * @dev Internal function to mint a new token
     * @dev Reverts if the given token ID already exists
     * @param _to The address that will own the minted token
     * @param _tokenId uint256 ID of the token to be minted by the msg.sender
     */
    function _mint(address _to, uint256 _tokenId) internal {
        require(_to != address(0));
        addTokenTo(_to, _tokenId);
        emit Transfer(address(0), _to, _tokenId);
    }

    /**
     * @dev Internal function to clear current approval of a given token ID
     * @dev Reverts if the given address is not indeed the owner of the token
     * @param _owner owner of the token
     * @param _tokenId uint256 ID of the token to be transferred
     */
    function clearApproval(address _owner, uint256 _tokenId) internal {
        require(ownerOf(_tokenId) == _owner);
        if (tokenApprovals[_tokenId] != address(0)) {
            tokenApprovals[_tokenId] = address(0);
            emit Approval(_owner, address(0), _tokenId);
        }
    }

    /**
     * @dev Internal function to add a token ID to the list of a given address
     * @param _to address representing the new owner of the given token ID
     * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function addTokenTo(address _to, uint256 _tokenId) internal {
        require(tokenOwner[_tokenId] == address(0));
        tokenOwner[_tokenId] = _to;
        ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
    }

    /**
     * @dev Internal function to remove a token ID from the list of a given address
     * @param _from address representing the previous owner of the given token ID
     * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function removeTokenFrom(address _from, uint256 _tokenId) internal {
        require(ownerOf(_tokenId) == _from);
        ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
        tokenOwner[_tokenId] = address(0);
    }

    /**
     * @dev Internal function to invoke `onERC721Received` on a target address
     * @dev 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 whether the call correctly returned the expected magic value
     */
    function checkAndCallSafeTransfer(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes _data
    )
    internal
    returns (bool)
    {
        if (!_to.isContract()) {
            return true;
        }
        bytes4 retval = ERC721Receiver(_to).onERC721Received(_from, _tokenId, _data);
        return (retval == ERC721_RECEIVED);
    }
}

contract ERC721Token is ERC721, ERC721BasicToken {

    // Token name
    string internal name_;

    // Token symbol
    string internal symbol_;

    // Mapping from owner to list of owned token IDs
    mapping(address => uint256[]) internal ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) internal ownedTokensIndex;

    /**
     * @dev Constructor function
     */
    constructor(string _name, string _symbol) public {
        supportedInterfaces[0x5b5e139f] = true; // ERC721Metadata
        supportedInterfaces[0x780e9d63] = true; // ERC721Enumerable

        name_ = _name;
        symbol_ = _symbol;
    }

    /**
     * @dev Gets the token name
     * @return string representing the token name
     */
    function name() public view returns (string) {
        return name_;
    }

    /**
     * @dev Gets the token symbol
     * @return string representing the token symbol
     */
    function symbol() public view returns (string) {
        return symbol_;
    }

    /**
     * @dev Returns an URI for a given token ID
     * @dev Throws if the token ID does not exist. May return an empty string.
     * @param _tokenId uint256 ID of the token to query
     */
    function tokenURI(uint256 _tokenId) public view returns (string);

    /**
     * @dev Gets the token ID at a given index of the tokens list of the requested owner
     * @param _owner address owning the tokens list to be accessed
     * @param _index uint256 representing the index to be accessed of the requested tokens list
     * @return uint256 token ID at the given index of the tokens list owned by the requested address
     */
    function tokenOfOwnerByIndex(address _owner, uint256 _index) public view returns (uint256) {
        require(_index < balanceOf(_owner));
        return ownedTokens[_owner][_index];
    }

    /**
     * @dev Gets the total amount of tokens stored by the contract
     * @return uint256 representing the total amount of tokens
     */
    function totalSupply() public view returns (uint256);

    /**
     * @dev Gets the token ID at a given index of all the tokens in this contract
     * @dev Reverts if the index is greater or equal to the total number of tokens
     * @param _index uint256 representing the index to be accessed of the tokens list
     * @return uint256 token ID at the given index of the tokens list
     */
    function tokenByIndex(uint256 _index) public view returns (uint256) {
        require(_index < totalSupply());

        //In our case id is an index and vice versa.
        return _index;
    }

    /**
     * @dev Internal function to add a token ID to the list of a given address
     * @param _to address representing the new owner of the given token ID
     * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function addTokenTo(address _to, uint256 _tokenId) internal {
        super.addTokenTo(_to, _tokenId);
        uint256 length = ownedTokens[_to].length;
        ownedTokens[_to].push(_tokenId);
        ownedTokensIndex[_tokenId] = length;
    }

    /**
     * @dev Internal function to remove a token ID from the list of a given address
     * @param _from address representing the previous owner of the given token ID
     * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function removeTokenFrom(address _from, uint256 _tokenId) internal {
        super.removeTokenFrom(_from, _tokenId);

        uint256 tokenIndex = ownedTokensIndex[_tokenId];
        uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
        uint256 lastToken = ownedTokens[_from][lastTokenIndex];

        ownedTokens[_from][tokenIndex] = lastToken;
        ownedTokens[_from][lastTokenIndex] = 0;
        // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
        // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
        // the lastToken to the first position, and then dropping the element placed in the last position of the list

        ownedTokens[_from].length--;
        ownedTokensIndex[_tokenId] = 0;
        ownedTokensIndex[lastToken] = tokenIndex;
    }

}

library StringUtils {

    struct slice {
        uint _len;
        uint _ptr;
    }

    /*
     * @dev Returns a slice containing the entire string.
     * @param self The string to make a slice from.
     * @return A newly allocated slice containing the entire string.
     */
    function toSlice(string memory self) internal pure returns (slice memory) {
        uint ptr;
        assembly {
            ptr := add(self, 0x20)
        }
        return slice(bytes(self).length, ptr);
    }

    /*
     * @dev Returns a newly allocated string containing the concatenation of
     *      `self` and `other`.
     * @param self The first slice to concatenate.
     * @param other The second slice to concatenate.
     * @return The concatenation of the two strings.
     */
    function concat(slice memory self, slice memory other) internal pure returns (string memory) {
        string memory ret = new string(self._len + other._len);
        uint retptr;
        assembly { retptr := add(ret, 32) }
        memcpy(retptr, self._ptr, self._len);
        memcpy(retptr + self._len, other._ptr, other._len);
        return ret;
    }

    function memcpy(uint dest, uint src, uint len) private pure {
        // Copy word-length chunks while possible
        for(; len >= 32; len -= 32) {
            assembly {
                mstore(dest, mload(src))
            }
            dest += 32;
            src += 32;
        }

        // Copy remaining bytes
        uint mask = 256 ** (32 - len) - 1;
        assembly {
            let srcpart := and(mload(src), not(mask))
            let destpart := and(mload(dest), mask)
            mstore(dest, or(destpart, srcpart))
        }
    }

}

contract ToonBase is ERC721Token, AccessControl, ToonInterface {

    using StringUtils for *;
    using SafeMath for uint;

    Toon[] private toons;
    uint public maxSupply;
    uint32 public maxPromoToons;
    address public authorAddress;

    string public endpoint = "https://mindhouse.io:3100/metadata/";

    constructor(string _name, string _symbol, uint _maxSupply, uint32 _maxPromoToons, address _author)
    public
    ERC721Token(_name, _symbol) {
        require(_maxPromoToons <= _maxSupply);

        maxSupply = _maxSupply;
        maxPromoToons = _maxPromoToons;
        authorAddress = _author;
    }

    function maxSupply() external view returns (uint) {
        return maxSupply;
    }

    /**
     * @dev Gets the total amount of tokens stored by the contract
     * @return uint256 representing the total amount of tokens
     */
    function totalSupply() public view returns (uint256) {
        return toons.length;
    }

    /**
     * @dev Returns an URI for a given token ID
     * @dev Throws if the token ID does not exist. May return an empty string.
     * @param _tokenId uint256 ID of the token to query
     */
    function tokenURI(uint256 _tokenId) public view returns (string) {
        require(exists(_tokenId));
        string memory slash = "/";
        return endpoint.toSlice().concat(name_.toSlice()).toSlice().concat(slash.toSlice()).toSlice().concat(_tokenId.toString().toSlice());
    }

    function authorAddress() external view returns (address) {
        return authorAddress;
    }

    function changeEndpoint(string newEndpoint) external onlyOwner {
        endpoint = newEndpoint;
    }

    function isToonInterface() external pure returns (bool) {
        return true;
    }

    function _getToon(uint _id) internal view returns (Toon){
        require(_id <= totalSupply());
        return toons[_id];
    }

    function _createToon(uint _genes, address _owner) internal {
        require(totalSupply() < maxSupply);

        Toon memory _toon = Toon(_genes, now);
        uint id = toons.push(_toon) - 1;

        _mint(_owner, id);
    }

    struct Toon {
        uint256 genes;

        uint256 birthTime;
    }
}

library SafeMath32 {


    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    function mul(uint32 a, uint32 b) internal pure returns (uint32 c) {
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    function div(uint32 a, uint32 b) internal pure returns (uint32) {
        // assert(b > 0); // Solidity automatically throws when dividing by 0
        // uint32 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
        return a / b;
    }

    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint32 a, uint32 b) internal pure returns (uint32) {
        assert(b <= a);
        return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint32 a, uint32 b) internal pure returns (uint32 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }

}

contract ToonMinting is ToonBase {
    using SafeMath32 for uint32;

    uint32 public promoToonsMinted = 0;

    constructor(string _name, string _symbol, uint _maxSupply, uint32 _maxPromoToons, address _author)
    public
    ToonBase(_name, _symbol, _maxSupply, _maxPromoToons, _author) {
    }

    function createPromoToon(uint _genes, address _owner) external onlyCOO {
        require(promoToonsMinted < maxPromoToons);
        address _toonOwner = _owner;
        if (_toonOwner == 0x0) {
            _toonOwner = cooAddress;
        }

        _createToon(_genes, _toonOwner);
        promoToonsMinted = promoToonsMinted.add(1);
    }

}

contract ToonAuction is ToonMinting {

    ClockAuction public saleAuction;

    constructor(string _name, string _symbol, uint _maxSupply, uint32 _maxPromoToons, address _author)
    public
    ToonMinting(_name, _symbol, _maxSupply, _maxPromoToons, _author) {
    }

    function setSaleAuctionAddress(address _address) external onlyCEO {
        ClockAuction candidateContract = ClockAuction(_address);
        require(candidateContract.isSaleClockAuction());

        // Set the new contract address
        saleAuction = candidateContract;
    }

    function createSaleAuction(
        uint256 _toonId,
        uint256 _startingPrice,
        uint256 _endingPrice,
        uint256 _duration
    )
    external
    whenNotPaused
    {
        // Auction contract checks input sizes
        // If toon is already on any auction, this will throw
        // because it will be owned by the auction contract.
        require(ownerOf(_toonId) == msg.sender);
        approve(saleAuction, _toonId);

        // Sale auction throws if inputs are invalid and clears
        // transfer approval after escrowing the toon.
        saleAuction.createAuction(
            this,
            _toonId,
            _startingPrice,
            _endingPrice,
            _duration,
            msg.sender
        );
    }

}

contract CryptoToon is ToonAuction {

    constructor(string _name, string _symbol, uint _maxSupply, uint32 _maxPromoToons, address _author)
    public
    ToonAuction(_name, _symbol, _maxSupply, _maxPromoToons, _author) {
    }

    function getToonInfo(uint _id) external view returns (
        uint genes,
        uint birthTime,
        address owner
    ) {
        Toon memory _toon = _getToon(_id);
        return (_toon.genes, _toon.birthTime, ownerOf(_id));
    }

}

{
  "compilationTarget": {
    "CryptoToon.sol": "CryptoToon"
  },
  "evmVersion": "byzantium",
  "libraries": {},
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}