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//SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.5.0;

import "./ERC1155Tradable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the `nonReentrant` modifier
 * available, which can be aplied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor() internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(
            localCounter == _guardCounter,
            "ReentrancyGuard: reentrant call"
        );
    }
}

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

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

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

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

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);

        require(success, "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"
            );
        }
    }
}

// https://docs.synthetix.io/contracts/Owned
contract Owned {
    address public owner;
    address public nominatedOwner;

    constructor(address _owner) public {
        require(_owner != address(0), "Owner address cannot be 0");
        owner = _owner;
        emit OwnerChanged(address(0), _owner);
    }

    function nominateNewOwner(address _owner) external onlyOwner {
        nominatedOwner = _owner;
        emit OwnerNominated(_owner);
    }

    function acceptOwnership() external {
        require(
            msg.sender == nominatedOwner,
            "You must be nominated before you can accept ownership"
        );
        emit OwnerChanged(owner, nominatedOwner);
        owner = nominatedOwner;
        nominatedOwner = address(0);
    }

    modifier onlyOwner() {
        require(
            msg.sender == owner,
            "Only the contract owner may perform this action"
        );
        _;
    }

    event OwnerNominated(address newOwner);
    event OwnerChanged(address oldOwner, address newOwner);
}

// Inheritance

// https://docs.synthetix.io/contracts/RewardsDistributionRecipient
contract RewardsDistributionRecipient is Owned {
    address public rewardsDistribution;

    function notifyRewardAmount(
        uint256 rewardNotifyAmount,
        uint256 rewardTransferAmount
    ) external;

    modifier onlyRewardsDistribution() {
        require(msg.sender == rewardsDistribution, "Wrong caller");
        _;
    }

    function setRewardsDistribution(address _rewardsDistribution)
        external
        onlyOwner
    {
        rewardsDistribution = _rewardsDistribution;
    }
}

contract TokenWrapper is ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    IERC20 public stakingToken;

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

    constructor(address _stakingToken) public {
        stakingToken = IERC20(_stakingToken);
    }

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

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

    function stake(uint256 amount) internal nonReentrant {
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
    }

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

interface IStratAccessNft {
    function getTotalUseCount(address _account, uint256 _id)
        external
        view
        returns (uint256);

    function getStratUseCount(
        address _account,
        uint256 _id,
        address _strategy
    ) external view returns (uint256);

    function startUsingNFT(address _account, uint256 _id) external;

    function endUsingNFT(address _account, uint256 _id) external;
}

contract DarkParadiseV2 is TokenWrapper, RewardsDistributionRecipient {
    IERC20 public rewardsToken;

    uint256 public DURATION = 1 seconds;

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

    //NFT
    IStratAccessNft public nft;

    // common, rare, unique ids considered in range on 1-111
    uint256 public constant rareMinId = 101;
    uint256 public constant uniqueId = 111;

    uint256 public minNFTId = 223;
    uint256 public maxNFTId = 444;

    uint256 public commonLimit = 3200 * 10**18;
    uint256 public rareLimit = 16500 * 10**18;
    uint256 public uniqueLimit = 30000 * 10**18;

    mapping(address => uint256) public usedNFT;

    event RewardAdded(uint256 rewardNotifyAmount, uint256 rewardTransferAmount);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event DurationChange(uint256 newDuration, uint256 oldDuration);
    event NFTSet(IStratAccessNft indexed newNFT);

    constructor(
        address _owner,
        address _rewardsToken,
        address _stakingToken,
        IStratAccessNft _nft
    ) public TokenWrapper(_stakingToken) Owned(_owner) {
        rewardsToken = IERC20(_rewardsToken);
        nft = _nft;
    }

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

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

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

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

    function getLimit(address user) public view returns (uint256) {
        uint256 nftId = usedNFT[user];
        if (nftId == 0) return 0;

        uint256 effectiveId = ((nftId - 1) % 111) + 1;
        if (effectiveId < rareMinId) return commonLimit;
        if (effectiveId < uniqueId) return rareLimit;
        return uniqueLimit;
    }

    function setNFT(IStratAccessNft _nftAddress) public onlyOwner {
        nft = _nftAddress;
        emit NFTSet(_nftAddress);
    }

    function setDepositLimits(
        uint256 _common,
        uint256 _rare,
        uint256 _unique
    ) external onlyOwner {
        if (commonLimit != _common) commonLimit = _common;
        if (rareLimit != _rare) rareLimit = _rare;
        if (uniqueLimit != _unique) uniqueLimit = _unique;
    }

    function setMinMaxNFT(uint256 _min, uint256 _max) external onlyOwner {
        if (minNFTId != _min) minNFTId = _min;
        if (maxNFTId != _max) maxNFTId = _max;
    }

    function setDuration(uint256 newDuration) external onlyOwner {
        emit DurationChange(newDuration, DURATION);
        DURATION = newDuration;
    }

    function stake(uint256 amount, uint256 _nftId)
        public
        updateReward(msg.sender)
    {
        require(amount > 0, "Cannot stake 0");
        require(_nftId >= minNFTId && _nftId <= maxNFTId, "Invalid nft");

        if (usedNFT[msg.sender] == 0) {
            usedNFT[msg.sender] = _nftId;
            nft.startUsingNFT(msg.sender, _nftId);
        }

        require(
            (amount + balanceOf(msg.sender)) <= getLimit(msg.sender),
            "Crossing limit"
        );

        super.stake(amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");

        //When a user withdraws their entire SDT from the strat, the strat stops using their NFT
        if (balanceOf(msg.sender) - amount == 0) {
            uint256 nftId = usedNFT[msg.sender];
            usedNFT[msg.sender] = 0;
            nft.endUsingNFT(msg.sender, nftId);
        }
        super.withdraw(amount);
        emit Withdrawn(msg.sender, amount);
    }

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

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

    function notifyRewardAmount(
        uint256 rewardNotifyAmount,
        uint256 rewardTransferAmount
    ) external onlyRewardsDistribution updateReward(address(0)) {
        require(rewardNotifyAmount >= rewardTransferAmount, "!Notify Amount");
        if (block.timestamp >= periodFinish) {
            rewardRate = rewardNotifyAmount.div(DURATION);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = rewardNotifyAmount.add(leftover).div(DURATION);
        }
        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(DURATION);

        rewardsToken.safeTransferFrom(
            msg.sender,
            address(this),
            rewardTransferAmount
        );
        emit RewardAdded(rewardNotifyAmount, rewardTransferAmount);
    }
}

//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Address.sol";

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping(address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account)
        internal
        view
        returns (bool)
    {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

contract MinterRole is Context {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor() internal {
        _addMinter(_msgSender());
    }

    modifier onlyMinter() {
        require(
            isMinter(_msgSender()),
            "MinterRole: caller does not have the Minter role"
        );
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

/**
 * @title WhitelistAdminRole
 * @dev WhitelistAdmins are responsible for assigning and removing Whitelisted accounts.
 */
contract WhitelistAdminRole is Context {
    using Roles for Roles.Role;

    event WhitelistAdminAdded(address indexed account);
    event WhitelistAdminRemoved(address indexed account);

    Roles.Role private _whitelistAdmins;

    constructor() internal {
        _addWhitelistAdmin(_msgSender());
    }

    modifier onlyWhitelistAdmin() {
        require(
            isWhitelistAdmin(_msgSender()),
            "WhitelistAdminRole: caller does not have the WhitelistAdmin role"
        );
        _;
    }

    function isWhitelistAdmin(address account) public view returns (bool) {
        return _whitelistAdmins.has(account);
    }

    function addWhitelistAdmin(address account) public onlyWhitelistAdmin {
        _addWhitelistAdmin(account);
    }

    function renounceWhitelistAdmin() public {
        _removeWhitelistAdmin(_msgSender());
    }

    function _addWhitelistAdmin(address account) internal {
        _whitelistAdmins.add(account);
        emit WhitelistAdminAdded(account);
    }

    function _removeWhitelistAdmin(address account) internal {
        _whitelistAdmins.remove(account);
        emit WhitelistAdminRemoved(account);
    }
}

/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface IERC165 {
    /**
     * @notice Query if a contract implements an interface
     * @dev Interface identification is specified in ERC-165. This function
     * uses less than 30,000 gas
     * @param _interfaceId The interface identifier, as specified in ERC-165
     */
    function supportsInterface(bytes4 _interfaceId)
        external
        view
        returns (bool);
}

/**
 * @dev ERC-1155 interface for accepting safe transfers.
 */
interface IERC1155TokenReceiver {
    /**
     * @notice Handle the receipt of a single ERC1155 token type
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeTransferFrom` after the balance has been updated
     * This function MAY throw to revert and reject the transfer
     * Return of other amount than the magic value MUST result in the transaction being reverted
     * Note: The token contract address is always the message sender
     * @param _operator  The address which called the `safeTransferFrom` function
     * @param _from      The address which previously owned the token
     * @param _id        The id of the token being transferred
     * @param _amount    The amount of tokens being transferred
     * @param _data      Additional data with no specified format
     * @return           `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     */
    function onERC1155Received(
        address _operator,
        address _from,
        uint256 _id,
        uint256 _amount,
        bytes calldata _data
    ) external returns (bytes4);

    /**
     * @notice Handle the receipt of multiple ERC1155 token types
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeBatchTransferFrom` after the balances have been updated
     * This function MAY throw to revert and reject the transfer
     * Return of other amount than the magic value WILL result in the transaction being reverted
     * Note: The token contract address is always the message sender
     * @param _operator  The address which called the `safeBatchTransferFrom` function
     * @param _from      The address which previously owned the token
     * @param _ids       An array containing ids of each token being transferred
     * @param _amounts   An array containing amounts of each token being transferred
     * @param _data      Additional data with no specified format
     * @return           `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     */
    function onERC1155BatchReceived(
        address _operator,
        address _from,
        uint256[] calldata _ids,
        uint256[] calldata _amounts,
        bytes calldata _data
    ) external returns (bytes4);

    /**
     * @notice Indicates whether a contract implements the `ERC1155TokenReceiver` functions and so can accept ERC1155 token types.
     * @param  interfaceID The ERC-165 interface ID that is queried for support.s
     * @dev This function MUST return true if it implements the ERC1155TokenReceiver interface and ERC-165 interface.
     *      This function MUST NOT consume more than 5,000 gas.
     * @return Wheter ERC-165 or ERC1155TokenReceiver interfaces are supported.
     */
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}

interface IERC1155 {
    // Events

    /**
     * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning
     *   Operator MUST be msg.sender
     *   When minting/creating tokens, the `_from` field MUST be set to `0x0`
     *   When burning/destroying tokens, the `_to` field MUST be set to `0x0`
     *   The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID
     *   To broadcast the existence of a token ID with no initial balance, the contract SHOULD emit the TransferSingle event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0
     */
    event TransferSingle(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256 _id,
        uint256 _amount
    );

    /**
     * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning
     *   Operator MUST be msg.sender
     *   When minting/creating tokens, the `_from` field MUST be set to `0x0`
     *   When burning/destroying tokens, the `_to` field MUST be set to `0x0`
     *   The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID
     *   To broadcast the existence of multiple token IDs with no initial balance, this SHOULD emit the TransferBatch event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0
     */
    event TransferBatch(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256[] _ids,
        uint256[] _amounts
    );

    /**
     * @dev MUST emit when an approval is updated
     */
    event ApprovalForAll(
        address indexed _owner,
        address indexed _operator,
        bool _approved
    );

    /**
     * @dev MUST emit when the URI is updated for a token ID
     *   URIs are defined in RFC 3986
     *   The URI MUST point a JSON file that conforms to the "ERC-1155 Metadata JSON Schema"
     */
    event URI(string _amount, uint256 indexed _id);

    /**
     * @notice Transfers amount of an _id from the _from address to the _to address specified
     * @dev MUST emit TransferSingle event on success
     * Caller must be approved to manage the _from account's tokens (see isApprovedForAll)
     * MUST throw if `_to` is the zero address
     * MUST throw if balance of sender for token `_id` is lower than the `_amount` sent
     * MUST throw on any other error
     * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155Received` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     * @param _data    Additional data with no specified format, sent in call to `_to`
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes calldata _data
    ) external;

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @dev MUST emit TransferBatch event on success
     * Caller must be approved to manage the _from account's tokens (see isApprovedForAll)
     * MUST throw if `_to` is the zero address
     * MUST throw if length of `_ids` is not the same as length of `_amounts`
     * MUST throw if any of the balance of sender for token `_ids` is lower than the respective `_amounts` sent
     * MUST throw on any other error
     * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155BatchReceived` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * Transfers and events MUST occur in the array order they were submitted (_ids[0] before _ids[1], etc)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     * @param _data     Additional data with no specified format, sent in call to `_to`
     */
    function safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] calldata _ids,
        uint256[] calldata _amounts,
        bytes calldata _data
    ) external;

    /**
     * @notice Get the balance of an account's Tokens
     * @param _owner  The address of the token holder
     * @param _id     ID of the Token
     * @return        The _owner's balance of the Token type requested
     */
    function balanceOf(address _owner, uint256 _id)
        external
        view
        returns (uint256);

    /**
     * @notice Get the balance of multiple account/token pairs
     * @param _owners The addresses of the token holders
     * @param _ids    ID of the Tokens
     * @return        The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair)
     */
    function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens
     * @dev MUST emit the ApprovalForAll event on success
     * @param _operator  Address to add to the set of authorized operators
     * @param _approved  True if the operator is approved, false to revoke approval
     */
    function setApprovalForAll(address _operator, bool _approved) external;

    /**
     * @notice Queries the approval status of an operator for a given owner
     * @param _owner     The owner of the Tokens
     * @param _operator  Address of authorized operator
     * @return           True if the operator is approved, false if not
     */
    function isApprovedForAll(address _owner, address _operator)
        external
        view
        returns (bool isOperator);
}

/**
 * @dev Implementation of Multi-Token Standard contract
 */
contract ERC1155 is IERC165 {
    using SafeMath for uint256;
    using Address for address;

    /***********************************|
  |        Variables and Events       |
  |__________________________________*/

    // onReceive function signatures
    bytes4 internal constant ERC1155_RECEIVED_VALUE = 0xf23a6e61;
    bytes4 internal constant ERC1155_BATCH_RECEIVED_VALUE = 0xbc197c81;

    // Objects balances
    mapping(address => mapping(uint256 => uint256)) internal balances;

    // Operator Functions
    mapping(address => mapping(address => bool)) internal operators;

    // Events
    event TransferSingle(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256 _id,
        uint256 _amount
    );
    event TransferBatch(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256[] _ids,
        uint256[] _amounts
    );
    event ApprovalForAll(
        address indexed _owner,
        address indexed _operator,
        bool _approved
    );
    event URI(string _uri, uint256 indexed _id);

    /***********************************|
  |     Public Transfer Functions     |
  |__________________________________*/

    /**
     * @notice Transfers amount amount of an _id from the _from address to the _to address specified
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     * @param _data    Additional data with no specified format, sent in call to `_to`
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) public {
        require(
            (msg.sender == _from) || isApprovedForAll(_from, msg.sender),
            "ERC1155#safeTransferFrom: INVALID_OPERATOR"
        );
        require(
            _to != address(0),
            "ERC1155#safeTransferFrom: INVALID_RECIPIENT"
        );
        // require(_amount >= balances[_from][_id]) is not necessary since checked with safemath operations

        _safeTransferFrom(_from, _to, _id, _amount);
        _callonERC1155Received(_from, _to, _id, _amount, _data);
    }

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     * @param _data     Additional data with no specified format, sent in call to `_to`
     */
    function safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) public {
        // Requirements
        require(
            (msg.sender == _from) || isApprovedForAll(_from, msg.sender),
            "ERC1155#safeBatchTransferFrom: INVALID_OPERATOR"
        );
        require(
            _to != address(0),
            "ERC1155#safeBatchTransferFrom: INVALID_RECIPIENT"
        );

        _safeBatchTransferFrom(_from, _to, _ids, _amounts);
        _callonERC1155BatchReceived(_from, _to, _ids, _amounts, _data);
    }

    /***********************************|
  |    Internal Transfer Functions    |
  |__________________________________*/

    /**
     * @notice Transfers amount amount of an _id from the _from address to the _to address specified
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     */
    function _safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount
    ) internal {
        // Update balances
        balances[_from][_id] = balances[_from][_id].sub(_amount); // Subtract amount
        balances[_to][_id] = balances[_to][_id].add(_amount); // Add amount

        // Emit event
        emit TransferSingle(msg.sender, _from, _to, _id, _amount);
    }

    /**
     * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155Received(...)
     */
    function _callonERC1155Received(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) internal {
        // Check if recipient is contract
        if (_to.isContract()) {
            bytes4 retval = IERC1155TokenReceiver(_to).onERC1155Received(
                msg.sender,
                _from,
                _id,
                _amount,
                _data
            );
            require(
                retval == ERC1155_RECEIVED_VALUE,
                "ERC1155#_callonERC1155Received: INVALID_ON_RECEIVE_MESSAGE"
            );
        }
    }

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     */
    function _safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155#_safeBatchTransferFrom: INVALID_ARRAYS_LENGTH"
        );

        // Number of transfer to execute
        uint256 nTransfer = _ids.length;

        // Executing all transfers
        for (uint256 i = 0; i < nTransfer; i++) {
            // Update storage balance of previous bin
            balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(
                _amounts[i]
            );
            balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]);
        }

        // Emit event
        emit TransferBatch(msg.sender, _from, _to, _ids, _amounts);
    }

    /**
     * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155BatchReceived(...)
     */
    function _callonERC1155BatchReceived(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) internal {
        // Pass data if recipient is contract
        if (_to.isContract()) {
            bytes4 retval = IERC1155TokenReceiver(_to).onERC1155BatchReceived(
                msg.sender,
                _from,
                _ids,
                _amounts,
                _data
            );
            require(
                retval == ERC1155_BATCH_RECEIVED_VALUE,
                "ERC1155#_callonERC1155BatchReceived: INVALID_ON_RECEIVE_MESSAGE"
            );
        }
    }

    /***********************************|
  |         Operator Functions        |
  |__________________________________*/

    /**
     * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens
     * @param _operator  Address to add to the set of authorized operators
     * @param _approved  True if the operator is approved, false to revoke approval
     */
    function setApprovalForAll(address _operator, bool _approved) external {
        // Update operator status
        operators[msg.sender][_operator] = _approved;
        emit ApprovalForAll(msg.sender, _operator, _approved);
    }

    /**
     * @notice Queries the approval status of an operator for a given owner
     * @param _owner     The owner of the Tokens
     * @param _operator  Address of authorized operator
     * @return True if the operator is approved, false if not
     */
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        returns (bool isOperator)
    {
        return operators[_owner][_operator];
    }

    /***********************************|
  |         Balance Functions         |
  |__________________________________*/

    /**
     * @notice Get the balance of an account's Tokens
     * @param _owner  The address of the token holder
     * @param _id     ID of the Token
     * @return The _owner's balance of the Token type requested
     */
    function balanceOf(address _owner, uint256 _id)
        public
        view
        returns (uint256)
    {
        return balances[_owner][_id];
    }

    /**
     * @notice Get the balance of multiple account/token pairs
     * @param _owners The addresses of the token holders
     * @param _ids    ID of the Tokens
     * @return        The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair)
     */
    function balanceOfBatch(address[] memory _owners, uint256[] memory _ids)
        public
        view
        returns (uint256[] memory)
    {
        require(
            _owners.length == _ids.length,
            "ERC1155#balanceOfBatch: INVALID_ARRAY_LENGTH"
        );

        // Variables
        uint256[] memory batchBalances = new uint256[](_owners.length);

        // Iterate over each owner and token ID
        for (uint256 i = 0; i < _owners.length; i++) {
            batchBalances[i] = balances[_owners[i]][_ids[i]];
        }

        return batchBalances;
    }

    /***********************************|
  |          ERC165 Functions         |
  |__________________________________*/

    /**
     * INTERFACE_SIGNATURE_ERC165 = bytes4(keccak256("supportsInterface(bytes4)"));
     */
    bytes4 private constant INTERFACE_SIGNATURE_ERC165 = 0x01ffc9a7;

    /**
     * INTERFACE_SIGNATURE_ERC1155 =
     * bytes4(keccak256("safeTransferFrom(address,address,uint256,uint256,bytes)")) ^
     * bytes4(keccak256("safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)")) ^
     * bytes4(keccak256("balanceOf(address,uint256)")) ^
     * bytes4(keccak256("balanceOfBatch(address[],uint256[])")) ^
     * bytes4(keccak256("setApprovalForAll(address,bool)")) ^
     * bytes4(keccak256("isApprovedForAll(address,address)"));
     */
    bytes4 private constant INTERFACE_SIGNATURE_ERC1155 = 0xd9b67a26;

    /**
     * @notice Query if a contract implements an interface
     * @param _interfaceID  The interface identifier, as specified in ERC-165
     * @return `true` if the contract implements `_interfaceID` and
     */
    function supportsInterface(bytes4 _interfaceID)
        external
        view
        returns (bool)
    {
        if (
            _interfaceID == INTERFACE_SIGNATURE_ERC165 ||
            _interfaceID == INTERFACE_SIGNATURE_ERC1155
        ) {
            return true;
        }
        return false;
    }
}

/**
 * @notice Contract that handles metadata related methods.
 * @dev Methods assume a deterministic generation of URI based on token IDs.
 *      Methods also assume that URI uses hex representation of token IDs.
 */
contract ERC1155Metadata {
    // URI's default URI prefix
    string internal baseMetadataURI;
    event URI(string _uri, uint256 indexed _id);

    /***********************************|
  |     Metadata Public Function s    |
  |__________________________________*/

    /**
     * @notice A distinct Uniform Resource Identifier (URI) for a given token.
     * @dev URIs are defined in RFC 3986.
     *      URIs are assumed to be deterministically generated based on token ID
     *      Token IDs are assumed to be represented in their hex format in URIs
     * @return URI string
     */
    function uri(uint256 _id) public view returns (string memory) {
        return
            string(abi.encodePacked(baseMetadataURI, _uint2str(_id), ".json"));
    }

    /***********************************|
  |    Metadata Internal Functions    |
  |__________________________________*/

    /**
     * @notice Will emit default URI log event for corresponding token _id
     * @param _tokenIDs Array of IDs of tokens to log default URI
     */
    function _logURIs(uint256[] memory _tokenIDs) internal {
        string memory baseURL = baseMetadataURI;
        string memory tokenURI;

        for (uint256 i = 0; i < _tokenIDs.length; i++) {
            tokenURI = string(
                abi.encodePacked(baseURL, _uint2str(_tokenIDs[i]), ".json")
            );
            emit URI(tokenURI, _tokenIDs[i]);
        }
    }

    /**
     * @notice Will emit a specific URI log event for corresponding token
     * @param _tokenIDs IDs of the token corresponding to the _uris logged
     * @param _URIs    The URIs of the specified _tokenIDs
     */
    function _logURIs(uint256[] memory _tokenIDs, string[] memory _URIs)
        internal
    {
        require(
            _tokenIDs.length == _URIs.length,
            "ERC1155Metadata#_logURIs: INVALID_ARRAYS_LENGTH"
        );
        for (uint256 i = 0; i < _tokenIDs.length; i++) {
            emit URI(_URIs[i], _tokenIDs[i]);
        }
    }

    /**
     * @notice Will update the base URL of token's URI
     * @param _newBaseMetadataURI New base URL of token's URI
     */
    function _setBaseMetadataURI(string memory _newBaseMetadataURI) internal {
        baseMetadataURI = _newBaseMetadataURI;
    }

    /***********************************|
  |    Utility Internal Functions     |
  |__________________________________*/

    /**
     * @notice Convert uint256 to string
     * @param _i Unsigned integer to convert to string
     */
    function _uint2str(uint256 _i)
        internal
        pure
        returns (string memory _uintAsString)
    {
        if (_i == 0) {
            return "0";
        }

        uint256 j = _i;
        uint256 ii = _i;
        uint256 len;

        // Get number of bytes
        while (j != 0) {
            len++;
            j /= 10;
        }

        bytes memory bstr = new bytes(len);
        uint256 k = len - 1;

        // Get each individual ASCII
        while (ii != 0) {
            bstr[k--] = bytes1(uint8(48 + (ii % 10)));
            ii /= 10;
        }

        // Convert to string
        return string(bstr);
    }
}

/**
 * @dev Multi-Fungible Tokens with minting and burning methods. These methods assume
 *      a parent contract to be executed as they are `internal` functions
 */
contract ERC1155MintBurn is ERC1155 {
    /****************************************|
  |            Minting Functions           |
  |_______________________________________*/

    /**
     * @notice Mint _amount of tokens of a given id
     * @param _to      The address to mint tokens to
     * @param _id      Token id to mint
     * @param _amount  The amount to be minted
     * @param _data    Data to pass if receiver is contract
     */
    function _mint(
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) internal {
        // Add _amount
        balances[_to][_id] = balances[_to][_id].add(_amount);

        // Emit event
        emit TransferSingle(msg.sender, address(0x0), _to, _id, _amount);

        // Calling onReceive method if recipient is contract
        _callonERC1155Received(address(0x0), _to, _id, _amount, _data);
    }

    /**
     * @notice Mint tokens for each ids in _ids
     * @param _to       The address to mint tokens to
     * @param _ids      Array of ids to mint
     * @param _amounts  Array of amount of tokens to mint per id
     * @param _data    Data to pass if receiver is contract
     */
    function _batchMint(
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155MintBurn#batchMint: INVALID_ARRAYS_LENGTH"
        );

        // Number of mints to execute
        uint256 nMint = _ids.length;

        // Executing all minting
        for (uint256 i = 0; i < nMint; i++) {
            // Update storage balance
            balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]);
        }

        // Emit batch mint event
        emit TransferBatch(msg.sender, address(0x0), _to, _ids, _amounts);

        // Calling onReceive method if recipient is contract
        _callonERC1155BatchReceived(address(0x0), _to, _ids, _amounts, _data);
    }

    /****************************************|
  |            Burning Functions           |
  |_______________________________________*/

    /**
     * @notice Burn _amount of tokens of a given token id
     * @param _from    The address to burn tokens from
     * @param _id      Token id to burn
     * @param _amount  The amount to be burned
     */
    function _burn(
        address _from,
        uint256 _id,
        uint256 _amount
    ) internal {
        //Substract _amount
        balances[_from][_id] = balances[_from][_id].sub(_amount);

        // Emit event
        emit TransferSingle(msg.sender, _from, address(0x0), _id, _amount);
    }

    /**
     * @notice Burn tokens of given token id for each (_ids[i], _amounts[i]) pair
     * @param _from     The address to burn tokens from
     * @param _ids      Array of token ids to burn
     * @param _amounts  Array of the amount to be burned
     */
    function _batchBurn(
        address _from,
        uint256[] memory _ids,
        uint256[] memory _amounts
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155MintBurn#batchBurn: INVALID_ARRAYS_LENGTH"
        );

        // Number of mints to execute
        uint256 nBurn = _ids.length;

        // Executing all minting
        for (uint256 i = 0; i < nBurn; i++) {
            // Update storage balance
            balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(
                _amounts[i]
            );
        }

        // Emit batch mint event
        emit TransferBatch(msg.sender, _from, address(0x0), _ids, _amounts);
    }
}

library Strings {
    // via https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c,
        string memory _d,
        string memory _e
    ) internal pure returns (string memory) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory _bd = bytes(_d);
        bytes memory _be = bytes(_e);
        string memory abcde = new string(
            _ba.length + _bb.length + _bc.length + _bd.length + _be.length
        );
        bytes memory babcde = bytes(abcde);
        uint256 k = 0;
        for (uint256 i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
        for (uint256 i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
        for (uint256 i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
        for (uint256 i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
        for (uint256 i = 0; i < _be.length; i++) babcde[k++] = _be[i];
        return string(babcde);
    }

    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c,
        string memory _d
    ) internal pure returns (string memory) {
        return strConcat(_a, _b, _c, _d, "");
    }

    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c
    ) internal pure returns (string memory) {
        return strConcat(_a, _b, _c, "", "");
    }

    function strConcat(string memory _a, string memory _b)
        internal
        pure
        returns (string memory)
    {
        return strConcat(_a, _b, "", "", "");
    }

    function uint2str(uint256 _i)
        internal
        pure
        returns (string memory _uintAsString)
    {
        if (_i == 0) {
            return "0";
        }
        uint256 j = _i;
        uint256 len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint256 k = len - 1;
        while (_i != 0) {
            bstr[k--] = bytes1(uint8(48 + (_i % 10)));
            _i /= 10;
        }
        return string(bstr);
    }
}

contract OwnableDelegateProxy {}

contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

/**
 * @title ERC1155Tradable
 * ERC1155Tradable - ERC1155 contract that whitelists an operator address, 
 * has create and mint functionality, and supports useful standards from OpenZeppelin,
  like _exists(), name(), symbol(), and totalSupply()
 */
contract ERC1155Tradable is
    ERC1155,
    ERC1155MintBurn,
    ERC1155Metadata,
    Ownable,
    MinterRole,
    WhitelistAdminRole
{
    using Strings for string;

    address proxyRegistryAddress;
    uint256 internal _currentTokenID = 0;
    mapping(uint256 => address) public creators;
    mapping(uint256 => uint256) public tokenSupply;
    mapping(uint256 => uint256) public tokenMaxSupply;
    // Contract name
    string public name;
    // Contract symbol
    string public symbol;

    constructor(
        string memory _name,
        string memory _symbol,
        address _proxyRegistryAddress
    ) public {
        name = _name;
        symbol = _symbol;
        proxyRegistryAddress = _proxyRegistryAddress;
    }

    function removeWhitelistAdmin(address account) public onlyOwner {
        _removeWhitelistAdmin(account);
    }

    function removeMinter(address account) public onlyOwner {
        _removeMinter(account);
    }

    function uri(uint256 _id) public view returns (string memory) {
        require(_exists(_id), "ERC721Tradable#uri: NONEXISTENT_TOKEN");
        return Strings.strConcat(baseMetadataURI, Strings.uint2str(_id));
    }

    /**
     * @dev Returns the total quantity for a token ID
     * @param _id uint256 ID of the token to query
     * @return amount of token in existence
     */
    function totalSupply(uint256 _id) public view returns (uint256) {
        return tokenSupply[_id];
    }

    /**
     * @dev Returns the max quantity for a token ID
     * @param _id uint256 ID of the token to query
     * @return amount of token in existence
     */
    function maxSupply(uint256 _id) public view returns (uint256) {
        return tokenMaxSupply[_id];
    }

    /**
     * @dev Will update the base URL of token's URI
     * @param _newBaseMetadataURI New base URL of token's URI
     */
    function setBaseMetadataURI(string memory _newBaseMetadataURI)
        public
        onlyWhitelistAdmin
    {
        _setBaseMetadataURI(_newBaseMetadataURI);
    }

    /**
     * @dev Creates a new token type and assigns _initialSupply to an address
     * @param _maxSupply max supply allowed
     * @param _initialSupply Optional amount to supply the first owner
     * @param _uri Optional URI for this token type
     * @param _data Optional data to pass if receiver is contract
     * @return The newly created token ID
     */
    function create(
        uint256 _maxSupply,
        uint256 _initialSupply,
        string memory _uri,
        bytes memory _data
    ) public onlyWhitelistAdmin returns (uint256 tokenId) {
        require(_initialSupply <= _maxSupply, "_initialSupply > _maxSupply");
        uint256 _id = _getNextTokenID();
        _incrementTokenTypeId();
        creators[_id] = msg.sender;

        if (bytes(_uri).length > 0) {
            emit URI(_uri, _id);
        }

        if (_initialSupply != 0) _mint(msg.sender, _id, _initialSupply, _data);
        tokenSupply[_id] = _initialSupply;
        tokenMaxSupply[_id] = _maxSupply;
        return _id;
    }

    /**
     * @dev Creates multiple new token types and assigns _initialSupply[i] of each token type, to an address
     * @param _maxSupply Array of max supplies allowed
     * @param _initialSupply Array of optional amounts to supply the first owner
     * @param _uri Array of optional URIs for each token type
     * @param _data Optional data to pass if receiver is contract. Same for each new token type
     * @return Array of newly created token IDs
     */
    function batchCreate(
        uint256[] calldata _maxSupply,
        uint256[] calldata _initialSupply,
        string[] calldata _uri,
        bytes calldata _data
    ) external onlyWhitelistAdmin returns (uint256[] memory) {
        require(
            _initialSupply.length == _maxSupply.length &&
                _uri.length == _maxSupply.length,
            "Array lengths mismatch"
        );

        uint256[] memory _ids = new uint256[](_maxSupply.length);
        uint256 _id = 0;

        for (uint256 index = 0; index < _maxSupply.length; index++) {
            _id = create(
                _maxSupply[index],
                _initialSupply[index],
                _uri[index],
                _data
            );

            _ids[index] = _id;
        }
        return _ids;
    }

    /**
     * @dev Mints some amount of tokens to an address
     * @param _to          Address of the future owner of the token
     * @param _id          Token ID to mint
     * @param _quantity    Amount of tokens to mint
     * @param _data        Data to pass if receiver is contract
     */
    function mint(
        address _to,
        uint256 _id,
        uint256 _quantity,
        bytes memory _data
    ) public onlyMinter {
        uint256 tokenId = _id;
        require(
            tokenSupply[tokenId] < tokenMaxSupply[tokenId],
            "Max supply reached"
        );
        _mint(_to, _id, _quantity, _data);
        tokenSupply[_id] = tokenSupply[_id].add(_quantity);
    }

    /**
     * @dev Mints some amount of tokens to an address
     * @param _to       The address to mint tokens to
     * @param _ids      Array of ids to mint
     * @param _amounts  Array of amount of tokens to mint per id
     * @param _data     Data to pass if receiver is contract
     */
    function batchMint(
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) public onlyMinter {
        uint256 nMints = _ids.length;
        for (uint256 i = 0; i < nMints; i++) {
            uint256 tokenId = _ids[i];
            require(
                tokenSupply[tokenId] < tokenMaxSupply[tokenId],
                "Max supply reached"
            );
            tokenSupply[tokenId] = tokenSupply[tokenId].add(_amounts[i]);
        }
        _batchMint(_to, _ids, _amounts, _data);
    }

    /**
     * @notice Burn _amount of tokens of a given token id
     * @param _from    The address to burn tokens from
     * @param _id      Token id to burn
     * @param _amount  The amount to be burned
     */
    function burn(
        address _from,
        uint256 _id,
        uint256 _amount
    ) public onlyOwner {
        tokenSupply[_id] = tokenSupply[_id].sub(_amount);
        _burn(_from, _id, _amount);
    }

    /**
     * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-free listings.
     */
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        returns (bool isOperator)
    {
        // Whitelist OpenSea proxy contract for easy trading.
        ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
        if (address(proxyRegistry.proxies(_owner)) == _operator) {
            return true;
        }

        return ERC1155.isApprovedForAll(_owner, _operator);
    }

    /**
     * @dev Returns whether the specified token exists by checking to see if it has a creator
     * @param _id uint256 ID of the token to query the existence of
     * @return bool whether the token exists
     */
    function _exists(uint256 _id) internal view returns (bool) {
        return creators[_id] != address(0);
    }

    /**
     * @dev calculates the next token ID based on value of _currentTokenID
     * @return uint256 for the next token ID
     */
    function _getNextTokenID() private view returns (uint256) {
        return _currentTokenID.add(1);
    }

    /**
     * @dev increments the value of _currentTokenID
     */
    function _incrementTokenTypeId() private {
        _currentTokenID++;
    }
}

pragma solidity ^0.5.0;

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

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

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

pragma solidity ^0.5.0;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

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

pragma solidity ^0.5.0;

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.
 *
 * 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(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

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

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

pragma solidity ^0.5.5;

/**
 * @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 Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

• No Contract Security Audit Submitted- Submit Audit Here

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IStratAccessNft","name":"newNFT","type":"address"}],"name":"NFTSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerNominated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"rewardNotifyAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rewardTransferAmount","type":"uint256"}],"name":"RewardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"RewardPaid","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdrawn","type":"event"},{"constant":true,"inputs":[],"name":"DURATION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"commonLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"earned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"exit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getLimit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"getReward","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"lastTimeRewardApplicable","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"lastUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"maxNFTId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"minNFTId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"nft","outputs":[{"internalType":"contract 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000000000000000000000000b36a0671b3d49587236d7833b01e79798175875f0000000000000000000000005af15da84a4a6edf2d9fa6720de921e1026e37b700000000000000000000000073968b9a57c6e53d41345fd57a6e6ae27d6cdb2f000000000000000000000000c5f572b705cae1893cdceb5161ce40e2fc5bb6cd

-----Decoded View---------------
Arg [0] : _owner (address): 0xb36a0671B3D49587236d7833B01E79798175875f
Arg [1] : _rewardsToken (address): 0x5af15DA84A4a6EDf2d9FA6720De921E1026E37b7
Arg [2] : _stakingToken (address): 0x73968b9a57c6E53d41345FD57a6E6ae27d6CDB2F
Arg [3] : _nft (address): 0xc5F572B705cAE1893CdcEB5161ce40e2fC5bB6cD

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000b36a0671b3d49587236d7833b01e79798175875f
Arg [1] : 0000000000000000000000005af15da84a4a6edf2d9fa6720de921e1026e37b7
Arg [2] : 00000000000000000000000073968b9a57c6e53d41345fd57a6e6ae27d6cdb2f
Arg [3] : 000000000000000000000000c5f572b705cae1893cdceb5161ce40e2fc5bb6cd