Contract 0x82c2a9b9ecfb70ac2fd80d7f484246e49ede1c8f

 
 
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0x1c9c0cbca1d3394b16b94d2781e7f32d8cbbaa10112c7e958d3b99889f942e6261410082021-03-30 20:25:21119 days 17 hrs agoRune Farm: Deployer IN  Contract Creation0 BNB0.02342004
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Contract Source Code Verified (Exact Match)

Contract Name:
ArcaneCharacterSpecialV1

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-03-30
*/

// File: @openzeppelin/contracts/GSN/Context.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

// File: @openzeppelin/contracts/access/Ownable.sol

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

pragma solidity >=0.6.0 <0.8.0;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

// File: @arcanefinance/swap-lib/contracts/token/BEP20/IBEP20.sol

pragma solidity >=0.4.0;

interface IBEP20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the token decimals.
     */
    function decimals() external view returns (uint8);

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

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

    /**
     * @dev Returns the bep token owner.
     */
    function getOwner() external view returns (address);

    /**
     * @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
    );
}

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

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

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

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

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

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

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

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

            bytes32 lastvalue = set._values[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value)
        internal
        returns (bool)
    {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value)
        internal
        returns (bool)
    {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value)
        internal
        view
        returns (bool)
    {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index)
        internal
        view
        returns (bytes32)
    {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

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

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

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

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

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

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

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

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

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

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) =
            target.call{value: value}(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data)
        internal
        view
        returns (bytes memory)
    {
        return
            functionStaticCall(
                target,
                data,
                "Address: low-level static call failed"
            );
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

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

// File: @openzeppelin/contracts/access/AccessControl.sol

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;

    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }

    mapping(bytes32 => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(
        bytes32 indexed role,
        bytes32 indexed previousAdminRole,
        bytes32 indexed newAdminRole
    );

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(
        bytes32 indexed role,
        address indexed account,
        address indexed sender
    );

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }

    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }

    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index)
        public
        view
        returns (address)
    {
        return _roles[role].members.at(index);
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(
            hasRole(_roles[role].adminRole, _msgSender()),
            "AccessControl: sender must be an admin to grant"
        );

        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(
            hasRole(_roles[role].adminRole, _msgSender()),
            "AccessControl: sender must be an admin to revoke"
        );

        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(
            account == _msgSender(),
            "AccessControl: can only renounce roles for self"
        );

        _revokeRole(role, account);
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }

    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }

    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}

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

pragma solidity >=0.6.0 <0.8.0;

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath}
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        // The {SafeMath} overflow check can be skipped here, see the comment at the top
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol

pragma solidity >=0.6.0 <0.8.0;

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

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol

pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol

pragma solidity >=0.6.2 <0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol

pragma solidity >=0.6.2 <0.8.0;

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

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

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

pragma solidity >=0.6.0 <0.8.0;

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

// File: @openzeppelin/contracts/introspection/ERC165.sol

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

pragma solidity >=0.6.0 <0.8.0;

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

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;
        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping(bytes32 => uint256) _indexes;
    }

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

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

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

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

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

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

            MapEntry storage lastEntry = map._entries[lastIndex];

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

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

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

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

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

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

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

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

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

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

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

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

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

pragma solidity >=0.6.0 <0.8.0;

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

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + (temp % 10)));
            temp /= 10;
        }
        return string(buffer);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Base URI
    string private _baseURI;

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

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

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

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

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

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

        return _holderTokens[owner].length();
    }

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

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

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

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

        string memory _tokenURI = _tokenURIs[tokenId];

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

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

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

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

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

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

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

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

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

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

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

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

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

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

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

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

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

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

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

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

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

// File: contracts/ArcaneCharacters.sol

pragma solidity ^0.6.0;

contract ArcaneCharacters is ERC721, Ownable {
    using Counters for Counters.Counter;

    // Map the number of tokens per characterId
    mapping(uint8 => uint256) public characterCount;

    // Map the number of tokens burnt per characterId
    mapping(uint8 => uint256) public characterBurnCount;

    // Used for generating the tokenId of new NFT minted
    Counters.Counter private _tokenIds;

    // Map the characterId for each tokenId
    mapping(uint256 => uint8) private characterIds;

    // Map the characterName for a tokenId
    mapping(uint8 => string) private characterNames;

    constructor(string memory _baseURI) public ERC721("Arcane Characters", "AC") {
        _setBaseURI(_baseURI);
    }

    /**
     * @dev Get characterId for a specific tokenId.
     */
    function getCharacterId(uint256 _tokenId) external view returns (uint8) {
        return characterIds[_tokenId];
    }

    /**
     * @dev Get the associated characterName for a specific characterId.
     */
    function getCharacterName(uint8 _characterId)
        external
        view
        returns (string memory)
    {
        return characterNames[_characterId];
    }

    /**
     * @dev Get the associated characterName for a unique tokenId.
     */
    function getCharacterNameOfTokenId(uint256 _tokenId)
        external
        view
        returns (string memory)
    {
        uint8 characterId = characterIds[_tokenId];
        return characterNames[characterId];
    }

    /**
     * @dev Mint NFTs. Only the owner can call it.
     */
    function mint(
        address _to,
        string calldata _tokenURI,
        uint8 _characterId
    ) external onlyOwner returns (uint256) {
        uint256 newId = _tokenIds.current();
        _tokenIds.increment();
        characterIds[newId] = _characterId;
        characterCount[_characterId] = characterCount[_characterId].add(1);
        _mint(_to, newId);
        _setTokenURI(newId, _tokenURI);
        return newId;
    }

    /**
     * @dev Set a unique name for each characterId. It is supposed to be called once.
     */
    function setCharacterName(uint8 _characterId, string calldata _name)
        external
        onlyOwner
    {
        characterNames[_characterId] = _name;
    }

    /**
     * @dev Burn a NFT token. Callable by owner only.
     */
    function burn(uint256 _tokenId) external onlyOwner {
        uint8 characterIdBurnt = characterIds[_tokenId];
        characterCount[characterIdBurnt] = characterCount[characterIdBurnt].sub(1);
        characterBurnCount[characterIdBurnt] = characterBurnCount[characterIdBurnt].add(1);
        _burn(_tokenId);
    }
}

// File: contracts/ArcaneCharacterMintingStation.sol

pragma solidity ^0.6.0;

/** @title ArcaneCharacterMintingStation.
@dev It is a contract that allow different factories to mint
Arcane Collectibles/Characters.
*/

contract ArcaneCharacterMintingStation is AccessControl {
    ArcaneCharacters public arcaneCharacters;

    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");

    // Modifier for minting roles
    modifier onlyMinter() {
        require(hasRole(MINTER_ROLE, _msgSender()), "Not a minting role");
        _;
    }

    // Modifier for admin roles
    modifier onlyOwner() {
        require(hasRole(DEFAULT_ADMIN_ROLE, _msgSender()), "Not an admin role");
        _;
    }

    constructor(ArcaneCharacters _arcaneCharacters) public {
        arcaneCharacters = _arcaneCharacters;
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
    }

    /**
     * @dev Mint NFTs from the ArcaneCharacters contract.
     * Users can specify what characterId they want to mint. Users can claim once.
     * There is a limit on how many are distributed. It requires RUNE balance to be > 0.
     */
    function mintCollectible(
        address _tokenReceiver,
        string calldata _tokenURI,
        uint8 _characterId
    ) external onlyMinter returns (uint256) {
        uint256 tokenId =
            arcaneCharacters.mint(_tokenReceiver, _tokenURI, _characterId);
        return tokenId;
    }

    /**
     * @dev Set up names for characters.
     * Only the main admins can set it.
     */
    function setCharacterName(uint8 _characterId, string calldata _characterName)
        external
        onlyOwner
    {
        arcaneCharacters.setCharacterName(_characterId, _characterName);
    }

    /**
     * @dev It transfers the ownership of the NFT contract
     * to a new address.
     * Only the main admins can set it.
     */
    function changeOwnershipNFTContract(address _newOwner) external onlyOwner {
        arcaneCharacters.transferOwnership(_newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721Holder.sol

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Implementation of the {IERC721Receiver} interface.
 *
 * Accepts all token transfers.
 * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
 */
contract ERC721Holder is IERC721Receiver {
    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address,
        address,
        uint256,
        bytes memory
    ) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// File: contracts/utils/SafeBEP20.sol

pragma solidity ^0.6.0;

/**
 * @title SafeBEP20
 * @dev Wrappers around BEP20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeBEP20 for IBEP20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeBEP20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IBEP20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transfer.selector, to, value)
        );
    }

    function safeTransferFrom(
        IBEP20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)
        );
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IBEP20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IBEP20 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),
            "SafeBEP20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(token.approve.selector, spender, value)
        );
    }

    function safeIncreaseAllowance(
        IBEP20 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(
        IBEP20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance =
            token.allowance(address(this), spender).sub(
                value,
                "SafeBEP20: decreased allowance below zero"
            );
        _callOptionalReturn(
            token,
            abi.encodeWithSelector(
                token.approve.selector,
                spender,
                newAllowance
            )
        );
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IBEP20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata =
            address(token).functionCall(
                data,
                "SafeBEP20: low-level call failed"
            );
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(
                abi.decode(returndata, (bool)),
                "SafeBEP20: BEP20 operation did not succeed"
            );
        }
    }
}

// File: contracts/utils/ArcaneProfile.sol

pragma solidity ^0.6.0;

/** @title ArcaneProfile.
@dev It is a contract for users to bind their address 
to a customizable profile by depositing a NFT.
*/
contract ArcaneProfile is AccessControl, ERC721Holder {
    using Counters for Counters.Counter;
    using SafeBEP20 for IBEP20;
    using SafeMath for uint256;

    IBEP20 public runeToken;

    bytes32 public constant NFT_ROLE = keccak256("NFT_ROLE");
    bytes32 public constant POINT_ROLE = keccak256("POINT_ROLE");
    bytes32 public constant SPECIAL_ROLE = keccak256("SPECIAL_ROLE");

    uint256 public numberActiveProfiles;
    uint256 public numberRuneToReactivate;
    uint256 public numberRuneToRegister;
    uint256 public numberRuneToUpdate;
    uint256 public numberTeams;

    mapping(address => bool) public hasRegistered;

    mapping(uint256 => Team) private teams;
    mapping(address => User) private users;

    // Used for generating the teamId
    Counters.Counter private _countTeams;

    // Used for generating the userId
    Counters.Counter private _countUsers;

    // Event to notify a new team is created
    event TeamAdd(uint256 teamId, string teamName);

    // Event to notify that team points are increased
    event TeamPointIncrease(
        uint256 indexed teamId,
        uint256 numberPoints,
        uint256 indexed campaignId
    );

    event UserChangeTeam(
        address indexed userAddress,
        uint256 oldTeamId,
        uint256 newTeamId
    );

    // Event to notify that a user is registered
    event UserNew(
        address indexed userAddress,
        uint256 teamId,
        address nftAddress,
        uint256 tokenId
    );

    // Event to notify a user pausing her profile
    event UserPause(address indexed userAddress, uint256 teamId);

    // Event to notify that user points are increased
    event UserPointIncrease(
        address indexed userAddress,
        uint256 numberPoints,
        uint256 indexed campaignId
    );

    // Event to notify that a list of users have an increase in points
    event UserPointIncreaseMultiple(
        address[] userAddresses,
        uint256 numberPoints,
        uint256 indexed campaignId
    );

    // Event to notify that a user is reactivating her profile
    event UserReactivate(
        address indexed userAddress,
        uint256 teamId,
        address nftAddress,
        uint256 tokenId
    );

    // Event to notify that a user is pausing her profile
    event UserUpdate(
        address indexed userAddress,
        address nftAddress,
        uint256 tokenId
    );

    // Modifier for admin roles
    modifier onlyOwner() {
        require(
            hasRole(DEFAULT_ADMIN_ROLE, _msgSender()),
            "Not the main admin"
        );
        _;
    }

    // Modifier for point roles
    modifier onlyPoint() {
        require(hasRole(POINT_ROLE, _msgSender()), "Not a point admin");
        _;
    }

    // Modifier for special roles
    modifier onlySpecial() {
        require(hasRole(SPECIAL_ROLE, _msgSender()), "Not a special admin");
        _;
    }

    struct Team {
        string teamName;
        string teamDescription;
        uint256 numberUsers;
        uint256 numberPoints;
        bool isJoinable;
    }

    struct User {
        uint256 userId;
        uint256 numberPoints;
        uint256 teamId;
        address nftAddress;
        uint256 tokenId;
        bool isActive;
    }

    constructor(
        IBEP20 _runeToken,
        uint256 _numberRuneToReactivate,
        uint256 _numberRuneToRegister,
        uint256 _numberRuneToUpdate
    ) public {
        runeToken = _runeToken;
        numberRuneToReactivate = _numberRuneToReactivate;
        numberRuneToRegister = _numberRuneToRegister;
        numberRuneToUpdate = _numberRuneToUpdate;
        _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());
    }

    /**
     * @dev To create a user profile. It sends the NFT to the contract
     * and sends RUNE to burn address. Requires 2 token approvals.
     */
    function createProfile(
        uint256 _teamId,
        address _nftAddress,
        uint256 _tokenId
    ) external {
        require(!hasRegistered[_msgSender()], "Already registered");
        require((_teamId <= numberTeams) && (_teamId > 0), "Invalid teamId");
        require(teams[_teamId].isJoinable, "Team not joinable");
        require(hasRole(NFT_ROLE, _nftAddress), "NFT address invalid");

        // Loads the interface to deposit the NFT contract
        IERC721 nftToken = IERC721(_nftAddress);

        require(
            _msgSender() == nftToken.ownerOf(_tokenId),
            "Only NFT owner can register"
        );

        // Transfer NFT to this contract
        nftToken.safeTransferFrom(_msgSender(), address(this), _tokenId);

        // Transfer RUNE tokens to this contract
        runeToken.safeTransferFrom(
            _msgSender(),
            address(this),
            numberRuneToRegister
        );

        // Increment the _countUsers counter and get userId
        _countUsers.increment();
        uint256 newUserId = _countUsers.current();

        // Add data to the struct for newUserId
        users[_msgSender()] = User({
            userId: newUserId,
            numberPoints: 0,
            teamId: _teamId,
            nftAddress: _nftAddress,
            tokenId: _tokenId,
            isActive: true
        });

        // Update registration status
        hasRegistered[_msgSender()] = true;

        // Update number of active profiles
        numberActiveProfiles = numberActiveProfiles.add(1);

        // Increase the number of users for the team
        teams[_teamId].numberUsers = teams[_teamId].numberUsers.add(1);

        // Emit an event
        emit UserNew(_msgSender(), _teamId, _nftAddress, _tokenId);
    }

    /**
     * @dev To pause user profile. It releases the NFT.
     * Callable only by registered users.
     */
    function pauseProfile() external {
        require(hasRegistered[_msgSender()], "Has not registered");

        // Checks whether user has already paused
        require(users[_msgSender()].isActive, "User not active");

        // Change status of user to make it inactive
        users[_msgSender()].isActive = false;

        // Retrieve the teamId of the user calling
        uint256 userTeamId = users[_msgSender()].teamId;

        // Reduce number of active users and team users
        teams[userTeamId].numberUsers = teams[userTeamId].numberUsers.sub(1);
        numberActiveProfiles = numberActiveProfiles.sub(1);

        // Interface to deposit the NFT contract
        IERC721 nftToken = IERC721(users[_msgSender()].nftAddress);

        // tokenId of NFT redeemed
        uint256 redeemedTokenId = users[_msgSender()].tokenId;

        // Change internal statuses as extra safety
        users[_msgSender()].nftAddress = address(
            0x0000000000000000000000000000000000000000
        );

        users[_msgSender()].tokenId = 0;

        // Transfer the NFT back to the user
        nftToken.safeTransferFrom(address(this), _msgSender(), redeemedTokenId);

        // Emit event
        emit UserPause(_msgSender(), userTeamId);
    }

    /**
     * @dev To update user profile.
     * Callable only by registered users.
     */
    function updateProfile(address _nftAddress, uint256 _tokenId) external {
        require(hasRegistered[_msgSender()], "Has not registered");
        require(hasRole(NFT_ROLE, _nftAddress), "NFT address invalid");
        require(users[_msgSender()].isActive, "User not active");

        address currentAddress = users[_msgSender()].nftAddress;
        uint256 currentTokenId = users[_msgSender()].tokenId;

        // Interface to deposit the NFT contract
        IERC721 nftNewToken = IERC721(_nftAddress);

        require(
            _msgSender() == nftNewToken.ownerOf(_tokenId),
            "Only NFT owner can update"
        );

        // Transfer token to new address
        nftNewToken.safeTransferFrom(_msgSender(), address(this), _tokenId);

        // Transfer RUNE token to this address
        runeToken.safeTransferFrom(
            _msgSender(),
            address(this),
            numberRuneToUpdate
        );

        // Interface to deposit the NFT contract
        IERC721 nftCurrentToken = IERC721(currentAddress);

        // Transfer old token back to the owner
        nftCurrentToken.safeTransferFrom(
            address(this),
            _msgSender(),
            currentTokenId
        );

        // Update mapping in storage
        users[_msgSender()].nftAddress = _nftAddress;
        users[_msgSender()].tokenId = _tokenId;

        emit UserUpdate(_msgSender(), _nftAddress, _tokenId);
    }

    /**
     * @dev To reactivate user profile.
     * Callable only by registered users.
     */
    function reactivateProfile(address _nftAddress, uint256 _tokenId) external {
        require(hasRegistered[_msgSender()], "Has not registered");
        require(hasRole(NFT_ROLE, _nftAddress), "NFT address invalid");
        require(!users[_msgSender()].isActive, "User is active");

        // Interface to deposit the NFT contract
        IERC721 nftToken = IERC721(_nftAddress);
        require(
            _msgSender() == nftToken.ownerOf(_tokenId),
            "Only NFT owner can update"
        );

        // Transfer to this address
        runeToken.safeTransferFrom(
            _msgSender(),
            address(this),
            numberRuneToReactivate
        );

        // Transfer NFT to contract
        nftToken.safeTransferFrom(_msgSender(), address(this), _tokenId);

        // Retrieve teamId of the user
        uint256 userTeamId = users[_msgSender()].teamId;

        // Update number of users for the team and number of active profiles
        teams[userTeamId].numberUsers = teams[userTeamId].numberUsers.add(1);
        numberActiveProfiles = numberActiveProfiles.add(1);

        // Update user statuses
        users[_msgSender()].isActive = true;
        users[_msgSender()].nftAddress = _nftAddress;
        users[_msgSender()].tokenId = _tokenId;

        // Emit event
        emit UserReactivate(_msgSender(), userTeamId, _nftAddress, _tokenId);
    }

    /**
     * @dev To increase the number of points for a user.
     * Callable only by point admins
     */
    function increaseUserPoints(
        address _userAddress,
        uint256 _numberPoints,
        uint256 _campaignId
    ) external onlyPoint {
        // Increase the number of points for the user
        users[_userAddress].numberPoints = users[_userAddress].numberPoints.add(
            _numberPoints
        );

        emit UserPointIncrease(_userAddress, _numberPoints, _campaignId);
    }

    /**
     * @dev To increase the number of points for a set of users.
     * Callable only by point admins
     */
    function increaseUserPointsMultiple(
        address[] calldata _userAddresses,
        uint256 _numberPoints,
        uint256 _campaignId
    ) external onlyPoint {
        require(_userAddresses.length < 1001, "Length must be < 1001");
        for (uint256 i = 0; i < _userAddresses.length; i++) {
            users[_userAddresses[i]].numberPoints = users[_userAddresses[i]]
                .numberPoints
                .add(_numberPoints);
        }
        emit UserPointIncreaseMultiple(
            _userAddresses,
            _numberPoints,
            _campaignId
        );
    }

    /**
     * @dev To increase the number of points for a team.
     * Callable only by point admins
     */

    function increaseTeamPoints(
        uint256 _teamId,
        uint256 _numberPoints,
        uint256 _campaignId
    ) external onlyPoint {
        // Increase the number of points for the team
        teams[_teamId].numberPoints = teams[_teamId].numberPoints.add(
            _numberPoints
        );

        emit TeamPointIncrease(_teamId, _numberPoints, _campaignId);
    }

    /**
     * @dev To remove the number of points for a user.
     * Callable only by point admins
     */
    function removeUserPoints(address _userAddress, uint256 _numberPoints)
        external
        onlyPoint
    {
        // Increase the number of points for the user
        users[_userAddress].numberPoints = users[_userAddress].numberPoints.sub(
            _numberPoints
        );
    }

    /**
     * @dev To remove a set number of points for a set of users.
     */
    function removeUserPointsMultiple(
        address[] calldata _userAddresses,
        uint256 _numberPoints
    ) external onlyPoint {
        require(_userAddresses.length < 1001, "Length must be < 1001");
        for (uint256 i = 0; i < _userAddresses.length; i++) {
            users[_userAddresses[i]].numberPoints = users[_userAddresses[i]]
                .numberPoints
                .sub(_numberPoints);
        }
    }

    /**
     * @dev To remove the number of points for a team.
     * Callable only by point admins
     */

    function removeTeamPoints(uint256 _teamId, uint256 _numberPoints)
        external
        onlyPoint
    {
        // Increase the number of points for the team
        teams[_teamId].numberPoints = teams[_teamId].numberPoints.sub(
            _numberPoints
        );
    }

    /**
     * @dev To add a NFT contract address for users to set their profile.
     * Callable only by owner admins.
     */
    function addNftAddress(address _nftAddress) external onlyOwner {
        require(
            IERC721(_nftAddress).supportsInterface(0x80ac58cd),
            "Not ERC721"
        );
        grantRole(NFT_ROLE, _nftAddress);
    }

    /**
     * @dev Add a new teamId
     * Callable only by owner admins.
     */
    function addTeam(
        string calldata _teamName,
        string calldata _teamDescription
    ) external onlyOwner {
        // Verify length is between 3 and 16
        bytes memory strBytes = bytes(_teamName);
        require(strBytes.length < 20, "Must be < 20");
        require(strBytes.length > 3, "Must be > 3");

        // Increment the _countTeams counter and get teamId
        _countTeams.increment();
        uint256 newTeamId = _countTeams.current();

        // Add new team data to the struct
        teams[newTeamId] = Team({
            teamName: _teamName,
            teamDescription: _teamDescription,
            numberUsers: 0,
            numberPoints: 0,
            isJoinable: true
        });

        numberTeams = newTeamId;
        emit TeamAdd(newTeamId, _teamName);
    }

    /**
     * @dev Function to change team.
     * Callable only by special admins.
     */
    function changeTeam(address _userAddress, uint256 _newTeamId)
        external
        onlySpecial
    {
        require(hasRegistered[_userAddress], "User doesn't exist");
        require(
            (_newTeamId <= numberTeams) && (_newTeamId > 0),
            "teamId doesn't exist"
        );
        require(teams[_newTeamId].isJoinable, "Team not joinable");
        require(
            users[_userAddress].teamId != _newTeamId,
            "Already in the team"
        );

        // Get old teamId
        uint256 oldTeamId = users[_userAddress].teamId;

        // Change number of users in old team
        teams[oldTeamId].numberUsers = teams[oldTeamId].numberUsers.sub(1);

        // Change teamId in user mapping
        users[_userAddress].teamId = _newTeamId;

        // Change number of users in new team
        teams[_newTeamId].numberUsers = teams[_newTeamId].numberUsers.add(1);

        emit UserChangeTeam(_userAddress, oldTeamId, _newTeamId);
    }

    /**
     * @dev Claim RUNE to burn later.
     * Callable only by owner admins.
     */
    function claimFee(uint256 _amount) external onlyOwner {
        runeToken.safeTransfer(_msgSender(), _amount);
    }

    /**
     * @dev Make a team joinable again.
     * Callable only by owner admins.
     */
    function makeTeamJoinable(uint256 _teamId) external onlyOwner {
        require((_teamId <= numberTeams) && (_teamId > 0), "teamId invalid");
        teams[_teamId].isJoinable = true;
    }

    /**
     * @dev Make a team not joinable.
     * Callable only by owner admins.
     */
    function makeTeamNotJoinable(uint256 _teamId) external onlyOwner {
        require((_teamId <= numberTeams) && (_teamId > 0), "teamId invalid");
        teams[_teamId].isJoinable = false;
    }

    /**
     * @dev Rename a team
     * Callable only by owner admins.
     */
    function renameTeam(
        uint256 _teamId,
        string calldata _teamName,
        string calldata _teamDescription
    ) external onlyOwner {
        require((_teamId <= numberTeams) && (_teamId > 0), "teamId invalid");

        // Verify length is between 3 and 16
        bytes memory strBytes = bytes(_teamName);
        require(strBytes.length < 20, "Must be < 20");
        require(strBytes.length > 3, "Must be > 3");

        teams[_teamId].teamName = _teamName;
        teams[_teamId].teamDescription = _teamDescription;
    }

    /**
     * @dev Update the number of RUNE to register
     * Callable only by owner admins.
     */
    function updateNumberRune(
        uint256 _newNumberRuneToReactivate,
        uint256 _newNumberRuneToRegister,
        uint256 _newNumberRuneToUpdate
    ) external onlyOwner {
        numberRuneToReactivate = _newNumberRuneToReactivate;
        numberRuneToRegister = _newNumberRuneToRegister;
        numberRuneToUpdate = _newNumberRuneToUpdate;
    }

    /**
     * @dev Check the user's profile for a given address
     */
    function getUserProfile(address _userAddress)
        external
        view
        returns (
            uint256,
            uint256,
            uint256,
            address,
            uint256,
            bool
        )
    {
        require(hasRegistered[_userAddress], "Not registered");
        return (
            users[_userAddress].userId,
            users[_userAddress].numberPoints,
            users[_userAddress].teamId,
            users[_userAddress].nftAddress,
            users[_userAddress].tokenId,
            users[_userAddress].isActive
        );
    }

    /**
     * @dev Check the user's status for a given address
     */
    function getUserStatus(address _userAddress) external view returns (bool) {
        return (users[_userAddress].isActive);
    }

    /**
     * @dev Check a team's profile
     */
    function getTeamProfile(uint256 _teamId)
        external
        view
        returns (
            string memory,
            string memory,
            uint256,
            uint256,
            bool
        )
    {
        require((_teamId <= numberTeams) && (_teamId > 0), "teamId invalid");
        return (
            teams[_teamId].teamName,
            teams[_teamId].teamDescription,
            teams[_teamId].numberUsers,
            teams[_teamId].numberPoints,
            teams[_teamId].isJoinable
        );
    }
}

// File: contracts/ArcaneCharacterSpecialV1.sol

pragma solidity ^0.6.12;

contract ArcaneCharacterSpecialV1 is Ownable {
    using SafeBEP20 for IBEP20;
    using SafeMath for uint256;

    ArcaneCharacterMintingStation public characterMintingStation;
    ArcaneProfile public arcaneProfile;

    IBEP20 public runeToken;

    uint256 public maxViewLength;
    uint256 public numberDifferentCharacters;

    // Map if address for a characterId has already claimed a NFT
    mapping(address => mapping(uint8 => bool)) public hasClaimed;

    // Map if characterId to its characteristics
    mapping(uint8 => Characters) public characterCharacteristics;

    // Number of previous series (i.e. different visuals)
    uint8 private constant previousNumberCharacterIds = 10;

    struct Characters {
        string tokenURI; // e.g. ipfsHash/hiccups.json
        uint256 thresholdUser; // e.g. 1900 or 100000
        uint256 runeCost;
        bool isActive;
        bool isCreated;
    }

    // Event to notify a new character is mintable
    event CharacterAdd(
        uint8 indexed characterId,
        uint256 thresholdUser,
        uint256 costRune
    );

    // Event to notify one of the characters' requirements to mint differ
    event CharacterChange(
        uint8 indexed characterId,
        uint256 thresholdUser,
        uint256 costRune,
        bool isActive
    );

    // Event to notify when NFT is successfully minted
    event CharacterMint(
        address indexed to,
        uint256 indexed tokenId,
        uint8 indexed characterId
    );

    constructor(
        ArcaneCharacterMintingStation _characterMintingStation,
        IBEP20 _runeToken,
        ArcaneProfile _arcaneProfile,
        uint256 _maxViewLength
    ) public {
        characterMintingStation = _characterMintingStation;
        runeToken = _runeToken;
        arcaneProfile = _arcaneProfile;
        maxViewLength = _maxViewLength;
    }

    /**
     * @dev Mint NFTs from the ArcaneCharacterMintingStation contract.
     * Users can claim once.
     */
    function mintNFT(uint8 _characterId) external {
        // Check that the _characterId is within boundary
        require(_characterId >= previousNumberCharacterIds, "ERR_ID_LOW");
        require(characterCharacteristics[_characterId].isActive, "ERR_ID_INVALID");

        address senderAddress = _msgSender();

        // 1. Check _msgSender() has not claimed
        require(!hasClaimed[senderAddress][_characterId], "ERR_HAS_CLAIMED");

        uint256 userId;
        bool isUserActive;

        (userId, , , , , isUserActive) = arcaneProfile.getUserProfile(
            senderAddress
        );

        require(
            userId < characterCharacteristics[_characterId].thresholdUser,
            "ERR_USER_NOT_ELIGIBLE"
        );

        require(isUserActive, "ERR_USER_NOT_ACTIVE");

        // Check if there is any cost associated with getting the character
        if (characterCharacteristics[_characterId].runeCost > 0) {
            runeToken.safeTransferFrom(
                senderAddress,
                address(this),
                characterCharacteristics[_characterId].runeCost
            );
        }

        // Update that _msgSender() has claimed
        hasClaimed[senderAddress][_characterId] = true;

        uint256 tokenId =
            characterMintingStation.mintCollectible(
                senderAddress,
                characterCharacteristics[_characterId].tokenURI,
                _characterId
            );

        emit CharacterMint(senderAddress, tokenId, _characterId);
    }

    function addCharacter(
        uint8 _characterId,
        string calldata _tokenURI,
        uint256 _thresholdUser,
        uint256 _runeCost
    ) external onlyOwner {
        require(!characterCharacteristics[_characterId].isCreated, "ERR_CREATED");
        require(_characterId >= previousNumberCharacterIds, "ERR_ID_LOW_2");

        characterCharacteristics[_characterId] = Characters({
            tokenURI: _tokenURI,
            thresholdUser: _thresholdUser,
            runeCost: _runeCost,
            isActive: true,
            isCreated: true
        });

        numberDifferentCharacters = numberDifferentCharacters.add(1);

        emit CharacterAdd(_characterId, _thresholdUser, _runeCost);
    }

    /**
     * @dev It transfers the RUNE tokens back to the chef address.
     * Only callable by the owner.
     */
    function claimFee(uint256 _amount) external onlyOwner {
        runeToken.safeTransfer(_msgSender(), _amount);
    }

    function updateCharacter(
        uint8 _characterId,
        uint256 _thresholdUser,
        uint256 _runeCost,
        bool _isActive
    ) external onlyOwner {
        require(characterCharacteristics[_characterId].isCreated, "ERR_NOT_CREATED");
        characterCharacteristics[_characterId].thresholdUser = _thresholdUser;
        characterCharacteristics[_characterId].runeCost = _runeCost;
        characterCharacteristics[_characterId].isActive = _isActive;

        emit CharacterChange(_characterId, _thresholdUser, _runeCost, _isActive);
    }

    function updateMaxViewLength(uint256 _newMaxViewLength) external onlyOwner {
        maxViewLength = _newMaxViewLength;
    }

    function canClaimSingle(address _userAddress, uint8 _characterId)
        external
        view
        returns (bool)
    {
        if (!arcaneProfile.hasRegistered(_userAddress)) {
            return false;
        } else {
            uint256 userId;
            bool userStatus;

            (userId, , , , , userStatus) = arcaneProfile.getUserProfile(
                _userAddress
            );

            if (!userStatus) {
                return false;
            } else {
                bool claimStatus = _canClaim(_userAddress, userId, _characterId);
                return claimStatus;
            }
        }
    }

    function canClaimMultiple(address _userAddress, uint8[] calldata _characterIds)
        external
        view
        returns (bool[] memory)
    {
        require(_characterIds.length <= maxViewLength, "ERR_LENGTH_VIEW");

        if (!arcaneProfile.hasRegistered(_userAddress)) {
            bool[] memory responses = new bool[](0);
            return responses;
        } else {
            uint256 userId;
            bool userStatus;

            (userId, , , , , userStatus) = arcaneProfile.getUserProfile(
                _userAddress
            );

            if (!userStatus) {
                bool[] memory responses = new bool[](0);
                return responses;
            } else {
                bool[] memory responses = new bool[](_characterIds.length);

                for (uint256 i = 0; i < _characterIds.length; i++) {
                    bool claimStatus =
                        _canClaim(_userAddress, userId, _characterIds[i]);
                    responses[i] = claimStatus;
                }
                return responses;
            }
        }
    }

    /**
     * @dev Check if user can claim.
     * If the address hadn't set up a profile, it will return an error.
     */
    function _canClaim(
        address _userAddress,
        uint256 userId,
        uint8 _characterId
    ) internal view returns (bool) {
        uint256 characterThreshold = characterCharacteristics[_characterId].thresholdUser;
        bool characterActive = characterCharacteristics[_characterId].isActive;

        if (hasClaimed[_userAddress][_characterId]) {
            return false;
        } else if (!characterActive) {
            return false;
        } else if (userId >= characterThreshold) {
            return false;
        } else {
            return true;
        }
    }
}

Contract ABI

[{"inputs":[{"internalType":"contract ArcaneCharacterMintingStation","name":"_characterMintingStation","type":"address"},{"internalType":"contract IBEP20","name":"_runeToken","type":"address"},{"internalType":"contract ArcaneProfile","name":"_arcaneProfile","type":"address"},{"internalType":"uint256","name":"_maxViewLength","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"characterId","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"thresholdUser","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"costRune","type":"uint256"}],"name":"CharacterAdd","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint8","name":"characterId","type":"uint8"},{"indexed":false,"internalType":"uint256","name":"thresholdUser","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"costRune","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isActive","type":"bool"}],"name":"CharacterChange","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"uint8","name":"characterId","type":"uint8"}],"name":"CharacterMint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"uint8","name":"_characterId","type":"uint8"},{"internalType":"string","name":"_tokenURI","type":"string"},{"internalType":"uint256","name":"_thresholdUser","type":"uint256"},{"internalType":"uint256","name":"_runeCost","type":"uint256"}],"name":"addCharacter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"arcaneProfile","outputs":[{"internalType":"contract ArcaneProfile","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"},{"internalType":"uint8[]","name":"_characterIds","type":"uint8[]"}],"name":"canClaimMultiple","outputs":[{"internalType":"bool[]","name":"","type":"bool[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_userAddress","type":"address"},{"internalType":"uint8","name":"_characterId","type":"uint8"}],"name":"canClaimSingle","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"","type":"uint8"}],"name":"characterCharacteristics","outputs":[{"internalType":"string","name":"tokenURI","type":"string"},{"internalType":"uint256","name":"thresholdUser","type":"uint256"},{"internalType":"uint256","name":"runeCost","type":"uint256"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"bool","name":"isCreated","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"characterMintingStation","outputs":[{"internalType":"contract ArcaneCharacterMintingStation","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"claimFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint8","name":"","type":"uint8"}],"name":"hasClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxViewLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"_characterId","type":"uint8"}],"name":"mintNFT","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"numberDifferentCharacters","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"runeToken","outputs":[{"internalType":"contract IBEP20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"_characterId","type":"uint8"},{"internalType":"uint256","name":"_thresholdUser","type":"uint256"},{"internalType":"uint256","name":"_runeCost","type":"uint256"},{"internalType":"bool","name":"_isActive","type":"bool"}],"name":"updateCharacter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newMaxViewLength","type":"uint256"}],"name":"updateMaxViewLength","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000009c8c29cb9d23a9a61b8ed4022150039f088b750e000000000000000000000000a9776b590bfc2f956711b3419910a5ec1f63153e0000000000000000000000002c4aa5618cfe5c6dcc4e40afd5025f68e75ebe7100000000000000000000000000000000000000000000000000000000000003e8

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000009c8c29cb9d23a9a61b8ed4022150039f088b750e
Arg [1] : 000000000000000000000000a9776b590bfc2f956711b3419910a5ec1f63153e
Arg [2] : 0000000000000000000000002c4aa5618cfe5c6dcc4e40afd5025f68e75ebe71
Arg [3] : 00000000000000000000000000000000000000000000000000000000000003e8


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://2d02a29ec95f280e039552b0a6f4e9a8d529ce432fe0be81c9926ec876cd22bd
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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