// SPDX-License-Identifier: MIT

// File: @openzeppelin/contracts/utils/Context.sol





// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)



pragma solidity ^0.8.0;



library Strings {

    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";



    /**

     * @dev Converts a `uint256` to its ASCII `string` decimal 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);

        while (value != 0) {

            digits -= 1;

            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));

            value /= 10;

        }

        return string(buffer);

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.

     */

    function toHexString(uint256 value) internal pure returns (string memory) {

        if (value == 0) {

            return "0x00";

        }

        uint256 temp = value;

        uint256 length = 0;

        while (temp != 0) {

            length++;

            temp >>= 8;

        }

        return toHexString(value, length);

    }



    /**

     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.

     */

    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {

        bytes memory buffer = new bytes(2 * length + 2);

        buffer[0] = "0";

        buffer[1] = "x";

        for (uint256 i = 2 * length + 1; i > 1; --i) {

            buffer[i] = _HEX_SYMBOLS[value & 0xf];

            value >>= 4;

        }

        require(value == 0, "Strings: hex length insufficient");

        return string(buffer);

    }

}



/**

 * @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 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) {

        return msg.sender;

    }



    function _msgData() internal view virtual returns (bytes calldata) {

        return msg.data;

    }

}

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() {

        _transferOwnership(_msgSender());

    }



    /**

     * @dev Returns the address of the current owner.

     */

    function owner() public view virtual 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 {

        _transferOwnership(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");

        _transferOwnership(newOwner);

    }



    /**

     * @dev Transfers ownership of the contract to a new account (`newOwner`).

     * Internal function without access restriction.

     */

    function _transferOwnership(address newOwner) internal virtual {

        address oldOwner = _owner;

        _owner = newOwner;

        emit OwnershipTransferred(oldOwner, newOwner);

    }

}

library Counters {

    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 {

        unchecked {

            counter._value += 1;

        }

    }



    function decrement(Counter storage counter) internal {

        uint256 value = counter._value;

        require(value > 0, "Counter: decrement overflow");

        unchecked {

            counter._value = value - 1;

        }

    }



    function reset(Counter storage counter) internal {

        counter._value = 0;

    }

}

// File: @openzeppelin/contracts/utils/Address.sol





// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)



pragma solidity ^0.8.1;



/**

 * @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

     * ====

     *

     * [IMPORTANT]

     * ====

     * You shouldn't rely on `isContract` to protect against flash loan attacks!

     *

     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets

     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract

     * constructor.

     * ====

     */

    function isContract(address account) internal view returns (bool) {

        // This method relies on extcodesize/address.code.length, which returns 0

        // for contracts in construction, since the code is only stored at the end

        // of the constructor execution.



        return account.code.length > 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");



        (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");



        (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");



        (bool success, bytes memory returndata) = target.staticcall(data);

        return verifyCallResult(success, returndata, errorMessage);

    }



    /**

     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],

     * but performing a delegate call.

     *

     * _Available since v3.4._

     */

    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {

        return functionDelegateCall(target, data, "Address: low-level delegate call failed");

    }



    /**

     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],

     * but performing a delegate call.

     *

     * _Available since v3.4._

     */

    function functionDelegateCall(

        address target,

        bytes memory data,

        string memory errorMessage

    ) internal returns (bytes memory) {

        require(isContract(target), "Address: delegate call to non-contract");



        (bool success, bytes memory returndata) = target.delegatecall(data);

        return verifyCallResult(success, returndata, errorMessage);

    }



    /**

     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the

     * revert reason using the provided one.

     *

     * _Available since v4.3._

     */

    function verifyCallResult(

        bool success,

        bytes memory returndata,

        string memory errorMessage

    ) internal 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



                assembly {

                    let returndata_size := mload(returndata)

                    revert(add(32, returndata), returndata_size)

                }

            } else {

                revert(errorMessage);

            }

        }

    }

}



// File: @openzeppelin/contracts/utils/introspection/IERC165.sol





// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)



pragma solidity ^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/utils/introspection/ERC165.sol





// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)



pragma solidity ^0.8.0;





/**

 * @dev Implementation of the {IERC165} interface.

 *

 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check

 * for the additional interface id that will be supported. For example:

 *

 * ```solidity

 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {

 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);

 * }

 * ```

 *

 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.

 */

abstract contract ERC165 is IERC165 {

    /**

     * @dev See {IERC165-supportsInterface}.

     */

    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {

        return interfaceId == type(IERC165).interfaceId;

    }

}



// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol





// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)



pragma solidity ^0.8.0;





/**

 * @dev _Available since v3.1._

 */

interface IERC1155Receiver is IERC165 {

    /**

     * @dev Handles the receipt of a single ERC1155 token type. This function is

     * called at the end of a `safeTransferFrom` after the balance has been updated.

     *

     * NOTE: To accept the transfer, this must return

     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`

     * (i.e. 0xf23a6e61, or its own function selector).

     *

     * @param operator The address which initiated the transfer (i.e. msg.sender)

     * @param from The address which previously owned the token

     * @param id The ID of the token being transferred

     * @param value The amount of tokens being transferred

     * @param data Additional data with no specified format

     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed

     */

    function onERC1155Received(

        address operator,

        address from,

        uint256 id,

        uint256 value,

        bytes calldata data

    ) external returns (bytes4);



    /**

     * @dev Handles the receipt of a multiple ERC1155 token types. This function

     * is called at the end of a `safeBatchTransferFrom` after the balances have

     * been updated.

     *

     * NOTE: To accept the transfer(s), this must return

     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`

     * (i.e. 0xbc197c81, or its own function selector).

     *

     * @param operator The address which initiated the batch transfer (i.e. msg.sender)

     * @param from The address which previously owned the token

     * @param ids An array containing ids of each token being transferred (order and length must match values array)

     * @param values An array containing amounts of each token being transferred (order and length must match ids array)

     * @param data Additional data with no specified format

     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed

     */

    function onERC1155BatchReceived(

        address operator,

        address from,

        uint256[] calldata ids,

        uint256[] calldata values,

        bytes calldata data

    ) external returns (bytes4);

}



// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol





// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)



pragma solidity ^0.8.0;





/**

 * @dev Required interface of an ERC1155 compliant contract, as defined in the

 * https://eips.ethereum.org/EIPS/eip-1155[EIP].

 *

 * _Available since v3.1._

 */

interface IERC1155 is IERC165 {

    /**

     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.

     */

    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);



    /**

     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all

     * transfers.

     */

    event TransferBatch(

        address indexed operator,

        address indexed from,

        address indexed to,

        uint256[] ids,

        uint256[] values

    );



    /**

     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to

     * `approved`.

     */

    event ApprovalForAll(address indexed account, address indexed operator, bool approved);



    /**

     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.

     *

     * If an {URI} event was emitted for `id`, the standard

     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value

     * returned by {IERC1155MetadataURI-uri}.

     */

    event URI(string value, uint256 indexed id);



    /**

     * @dev Returns the amount of tokens of token type `id` owned by `account`.

     *

     * Requirements:

     *

     * - `account` cannot be the zero address.

     */

    function balanceOf(address account, uint256 id) external view returns (uint256);



    /**

     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.

     *

     * Requirements:

     *

     * - `accounts` and `ids` must have the same length.

     */

    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)

        external

        view

        returns (uint256[] memory);



    /**

     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,

     *

     * Emits an {ApprovalForAll} event.

     *

     * Requirements:

     *

     * - `operator` cannot be the caller.

     */

    function setApprovalForAll(address operator, bool approved) external;



    /**

     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.

     *

     * See {setApprovalForAll}.

     */

    function isApprovedForAll(address account, address operator) external view returns (bool);



    /**

     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.

     *

     * Emits a {TransferSingle} event.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.

     * - `from` must have a balance of tokens of type `id` of at least `amount`.

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the

     * acceptance magic value.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 id,

        uint256 amount,

        bytes calldata data

    ) external;



    /**

     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.

     *

     * Emits a {TransferBatch} event.

     *

     * Requirements:

     *

     * - `ids` and `amounts` must have the same length.

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the

     * acceptance magic value.

     */

    function safeBatchTransferFrom(

        address from,

        address to,

        uint256[] calldata ids,

        uint256[] calldata amounts,

        bytes calldata data

    ) external;

}



// File: @openzeppelin/contracts/token/ERC1155/extensions/IERC1155MetadataURI.sol





// OpenZeppelin Contracts v4.4.1 (token/ERC1155/extensions/IERC1155MetadataURI.sol)



pragma solidity ^0.8.0;





/**

 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined

 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].

 *

 * _Available since v3.1._

 */

interface IERC1155MetadataURI is IERC1155 {

    /**

     * @dev Returns the URI for token type `id`.

     *

     * If the `\{id\}` substring is present in the URI, it must be replaced by

     * clients with the actual token type ID.

     */

    function uri(uint256 id) external view returns (string memory);

}



// File: @openzeppelin/contracts/token/ERC1155/ERC1155.sol





// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC1155/ERC1155.sol)



pragma solidity ^0.8.0;















/**

 * @dev Implementation of the basic standard multi-token.

 * See https://eips.ethereum.org/EIPS/eip-1155

 * Originally based on code by Enjin: https://github.com/enjin/erc-1155

 *

 * _Available since v3.1._

 */

contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {

    using Address for address;



    // Mapping from token ID to account balances

    mapping(uint256 => mapping(address => uint256)) private _balances;



    // Mapping from account to operator approvals

    mapping(address => mapping(address => bool)) private _operatorApprovals;



    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json

    string private _uri;



    /**

     * @dev See {_setURI}.

     */

    constructor(string memory uri_) {

        _setURI(uri_);

    }



    /**

     * @dev See {IERC165-supportsInterface}.

     */

    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {

        return

            interfaceId == type(IERC1155).interfaceId ||

            interfaceId == type(IERC1155MetadataURI).interfaceId ||

            super.supportsInterface(interfaceId);

    }



    /**

     * @dev See {IERC1155MetadataURI-uri}.

     *

     * This implementation returns the same URI for *all* token types. It relies

     * on the token type ID substitution mechanism

     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].

     *

     * Clients calling this function must replace the `\{id\}` substring with the

     * actual token type ID.

     */

    function uri(uint256) public view virtual override returns (string memory) {

        return _uri;

    }



    /**

     * @dev See {IERC1155-balanceOf}.

     *

     * Requirements:

     *

     * - `account` cannot be the zero address.

     */

    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {

        require(account != address(0), "ERC1155: balance query for the zero address");

        return _balances[id][account];

    }



    /**

     * @dev See {IERC1155-balanceOfBatch}.

     *

     * Requirements:

     *

     * - `accounts` and `ids` must have the same length.

     */

    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)

        public

        view

        virtual

        override

        returns (uint256[] memory)

    {

        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");



        uint256[] memory batchBalances = new uint256[](accounts.length);



        for (uint256 i = 0; i < accounts.length; ++i) {

            batchBalances[i] = balanceOf(accounts[i], ids[i]);

        }



        return batchBalances;

    }



    /**

     * @dev See {IERC1155-setApprovalForAll}.

     */

    function setApprovalForAll(address operator, bool approved) public virtual override {

        _setApprovalForAll(_msgSender(), operator, approved);

    }



    /**

     * @dev See {IERC1155-isApprovedForAll}.

     */

    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {

        return _operatorApprovals[account][operator];

    }



    /**

     * @dev See {IERC1155-safeTransferFrom}.

     */

    function safeTransferFrom(

        address from,

        address to,

        uint256 id,

        uint256 amount,

        bytes memory data

    ) public virtual override {

        require(

            from == _msgSender() || isApprovedForAll(from, _msgSender()),

            "ERC1155: caller is not owner nor approved"

        );

        _safeTransferFrom(from, to, id, amount, data);

    }



    /**

     * @dev See {IERC1155-safeBatchTransferFrom}.

     */

    function safeBatchTransferFrom(

        address from,

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) public virtual override {

        require(

            from == _msgSender() || isApprovedForAll(from, _msgSender()),

            "ERC1155: transfer caller is not owner nor approved"

        );

        _safeBatchTransferFrom(from, to, ids, amounts, data);

    }



    /**

     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.

     *

     * Emits a {TransferSingle} event.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - `from` must have a balance of tokens of type `id` of at least `amount`.

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the

     * acceptance magic value.

     */

    function _safeTransferFrom(

        address from,

        address to,

        uint256 id,

        uint256 amount,

        bytes memory data

    ) internal virtual {

        require(to != address(0), "ERC1155: transfer to the zero address");



        address operator = _msgSender();

        uint256[] memory ids = _asSingletonArray(id);

        uint256[] memory amounts = _asSingletonArray(amount);



        _beforeTokenTransfer(operator, from, to, ids, amounts, data);



        uint256 fromBalance = _balances[id][from];

        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");

        unchecked {

            _balances[id][from] = fromBalance - amount;

        }

        _balances[id][to] += amount;



        emit TransferSingle(operator, from, to, id, amount);



        _afterTokenTransfer(operator, from, to, ids, amounts, data);



        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);

    }



    /**

     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.

     *

     * Emits a {TransferBatch} event.

     *

     * Requirements:

     *

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the

     * acceptance magic value.

     */

    function _safeBatchTransferFrom(

        address from,

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) internal virtual {

        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        require(to != address(0), "ERC1155: transfer to the zero address");



        address operator = _msgSender();



        _beforeTokenTransfer(operator, from, to, ids, amounts, data);



        for (uint256 i = 0; i < ids.length; ++i) {

            uint256 id = ids[i];

            uint256 amount = amounts[i];



            uint256 fromBalance = _balances[id][from];

            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");

            unchecked {

                _balances[id][from] = fromBalance - amount;

            }

            _balances[id][to] += amount;

        }



        emit TransferBatch(operator, from, to, ids, amounts);



        _afterTokenTransfer(operator, from, to, ids, amounts, data);



        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);

    }



    /**

     * @dev Sets a new URI for all token types, by relying on the token type ID

     * substitution mechanism

     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].

     *

     * By this mechanism, any occurrence of the `\{id\}` substring in either the

     * URI or any of the amounts in the JSON file at said URI will be replaced by

     * clients with the token type ID.

     *

     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be

     * interpreted by clients as

     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`

     * for token type ID 0x4cce0.

     *

     * See {uri}.

     *

     * Because these URIs cannot be meaningfully represented by the {URI} event,

     * this function emits no events.

     */

    function _setURI(string memory newuri) internal virtual {

        _uri = newuri;

    }



    /**

     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.

     *

     * Emits a {TransferSingle} event.

     *

     * Requirements:

     *

     * - `to` cannot be the zero address.

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the

     * acceptance magic value.

     */

    function _mint(

        address to,

        uint256 id,

        uint256 amount,

        bytes memory data

    ) internal virtual {

        require(to != address(0), "ERC1155: mint to the zero address");



        address operator = _msgSender();

        uint256[] memory ids = _asSingletonArray(id);

        uint256[] memory amounts = _asSingletonArray(amount);



        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);



        _balances[id][to] += amount;

        emit TransferSingle(operator, address(0), to, id, amount);



        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);



        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);

    }



    /**

     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.

     *

     * Requirements:

     *

     * - `ids` and `amounts` must have the same length.

     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the

     * acceptance magic value.

     */

    function _mintBatch(

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) internal virtual {

        require(to != address(0), "ERC1155: mint to the zero address");

        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");



        address operator = _msgSender();



        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);



        for (uint256 i = 0; i < ids.length; i++) {

            _balances[ids[i]][to] += amounts[i];

        }



        emit TransferBatch(operator, address(0), to, ids, amounts);



        _afterTokenTransfer(operator, address(0), to, ids, amounts, data);



        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);

    }



    /**

     * @dev Destroys `amount` tokens of token type `id` from `from`

     *

     * Requirements:

     *

     * - `from` cannot be the zero address.

     * - `from` must have at least `amount` tokens of token type `id`.

     */

    function _burn(

        address from,

        uint256 id,

        uint256 amount

    ) internal virtual {

        require(from != address(0), "ERC1155: burn from the zero address");



        address operator = _msgSender();

        uint256[] memory ids = _asSingletonArray(id);

        uint256[] memory amounts = _asSingletonArray(amount);



        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");



        uint256 fromBalance = _balances[id][from];

        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");

        unchecked {

            _balances[id][from] = fromBalance - amount;

        }



        emit TransferSingle(operator, from, address(0), id, amount);



        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");

    }



    /**

     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.

     *

     * Requirements:

     *

     * - `ids` and `amounts` must have the same length.

     */

    function _burnBatch(

        address from,

        uint256[] memory ids,

        uint256[] memory amounts

    ) internal virtual {

        require(from != address(0), "ERC1155: burn from the zero address");

        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");



        address operator = _msgSender();



        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");



        for (uint256 i = 0; i < ids.length; i++) {

            uint256 id = ids[i];

            uint256 amount = amounts[i];



            uint256 fromBalance = _balances[id][from];

            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");

            unchecked {

                _balances[id][from] = fromBalance - amount;

            }

        }



        emit TransferBatch(operator, from, address(0), ids, amounts);



        _afterTokenTransfer(operator, from, address(0), ids, amounts, "");

    }



    /**

     * @dev Approve `operator` to operate on all of `owner` tokens

     *

     * Emits a {ApprovalForAll} event.

     */

    function _setApprovalForAll(

        address owner,

        address operator,

        bool approved

    ) internal virtual {

        require(owner != operator, "ERC1155: setting approval status for self");

        _operatorApprovals[owner][operator] = approved;

        emit ApprovalForAll(owner, operator, approved);

    }



    /**

     * @dev Hook that is called before any token transfer. This includes minting

     * and burning, as well as batched variants.

     *

     * The same hook is called on both single and batched variants. For single

     * transfers, the length of the `id` and `amount` arrays will be 1.

     *

     * Calling conditions (for each `id` and `amount` pair):

     *

     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens

     * of token type `id` will be  transferred to `to`.

     * - When `from` is zero, `amount` tokens of token type `id` will be minted

     * for `to`.

     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`

     * will be burned.

     * - `from` and `to` are never both zero.

     * - `ids` and `amounts` have the same, non-zero length.

     *

     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].

     */

    function _beforeTokenTransfer(

        address operator,

        address from,

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) internal virtual {}



    /**

     * @dev Hook that is called after any token transfer. This includes minting

     * and burning, as well as batched variants.

     *

     * The same hook is called on both single and batched variants. For single

     * transfers, the length of the `id` and `amount` arrays will be 1.

     *

     * Calling conditions (for each `id` and `amount` pair):

     *

     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens

     * of token type `id` will be  transferred to `to`.

     * - When `from` is zero, `amount` tokens of token type `id` will be minted

     * for `to`.

     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`

     * will be burned.

     * - `from` and `to` are never both zero.

     * - `ids` and `amounts` have the same, non-zero length.

     *

     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].

     */

    function _afterTokenTransfer(

        address operator,

        address from,

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) internal virtual {}



    function _doSafeTransferAcceptanceCheck(

        address operator,

        address from,

        address to,

        uint256 id,

        uint256 amount,

        bytes memory data

    ) private {

        if (to.isContract()) {

            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {

                if (response != IERC1155Receiver.onERC1155Received.selector) {

                    revert("ERC1155: ERC1155Receiver rejected tokens");

                }

            } catch Error(string memory reason) {

                revert(reason);

            } catch {

                revert("ERC1155: transfer to non ERC1155Receiver implementer");

            }

        }

    }



    function _doSafeBatchTransferAcceptanceCheck(

        address operator,

        address from,

        address to,

        uint256[] memory ids,

        uint256[] memory amounts,

        bytes memory data

    ) private {

        if (to.isContract()) {

            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (

                bytes4 response

            ) {

                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {

                    revert("ERC1155: ERC1155Receiver rejected tokens");

                }

            } catch Error(string memory reason) {

                revert(reason);

            } catch {

                revert("ERC1155: transfer to non ERC1155Receiver implementer");

            }

        }

    }



    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {

        uint256[] memory array = new uint256[](1);

        array[0] = element;



        return array;

    }

}



// File: ceva.sol





contract QPTMETACARD is ERC1155, Ownable {

    using Strings for uint256;

    using Counters for Counters.Counter;

    string private baseURI;

    bool public paused = true;

    // token ids

    uint256 public constant Black = 1;

    uint256 public constant Bronze = 2;

    uint256 public constant Silver = 3;

    uint256 public constant Gold = 4;

    //

    // cost of tokens

    uint256 public costGold = 1 ether;

    uint256 public costSilver = 0.7 ether;

    uint256 public costBronze = 0.3 ether;

    uint256 public costBlack = 0.2 ether;

    //

    // supplies of each token

    Counters.Counter private supplyBlack;

    Counters.Counter private supplyBronze;

    Counters.Counter private supplySilver;

    Counters.Counter private supplyGold;

    //

    // max supplies for each token

    uint256 public maxSupplyBlack = 9090;

    uint256 public maxSupplyBronze = 800;

    uint256 public maxSupplySilver = 100;

    uint256 public maxSupplyGold = 10;

    //

    //whitelist variables

    mapping(address => bool) private whitelistedAddresses;

    bool public onlyWhitelisted = true;



    constructor() ERC1155("") {

        setBaseURI(" ipfs://QmPDyGbgfvVVuvTUSZo9EWzeiTTun53jVW9pwAULUoZMde/");

    }

    modifier mintCompliance(uint256 _mintAmount,uint256 _nftType) {

        require(1 <= _nftType && _nftType <= 4, "Wrong NFT. Choose between 1-4.");

        require(_mintAmount > 0, "Can't mint 0 nfts");

        require(!paused, "The contract is paused!");

        if(onlyWhitelisted== true) {

            require(isWhitelisted(msg.sender), "User is not whitelisted");

        }

        (uint256 maxSupply, Counters.Counter storage supply, uint256 cost) = getInfoAboutToken(_nftType);

        require(supply.current() + _mintAmount <= maxSupply, "Max supply exceeded!");

        require(msg.value >= cost * _mintAmount, "Insufficient funds!");

        for(uint256 i = 0; i < _mintAmount ; i ++)

            supply.increment();

    _;

   }

    function mint(uint256 _mintAmount, uint256 _nftType) public payable mintCompliance(_mintAmount, _nftType) {

        _mint(msg.sender, _nftType, _mintAmount, "");

    }

      function AirDropTo(address _user, uint256 tokenName) public onlyOwner

    {

        require(tokenName >= 1 && tokenName <= 4, "Wrong NFT. Choose between 1-4");

        (uint256 maxSupply, Counters.Counter storage supply,) = getInfoAboutToken(tokenName);

        require(supply.current() + 1 <= maxSupply); 

        supply.increment();

        _mint(_user, tokenName, 1, "");

      

    } 

 

    function getInfoAboutToken(uint256 tokenType) internal view returns(uint256 maxSupply, Counters.Counter storage supply, uint256 cost)

    {

        supply = supplyBlack;

        //black case

        if(tokenType == 1)

        {

            maxSupply = maxSupplyBlack;

            supply = supplyBlack;

            cost = costBlack;

        }

        if(tokenType == 2)

        {

            maxSupply = maxSupplyBronze;

            supply = supplyBronze;

            cost = costBronze;

        }

        if(tokenType == 3)

        {

            maxSupply = maxSupplySilver;

            supply = supplySilver;

            cost = costSilver;

        }

        if(tokenType == 4)

        {

            maxSupply = maxSupplyGold;

            supply = supplyGold;

            cost = costGold;

        }

    }

    // whitelist section 

    function addUserToWhitelist(address _user) public onlyOwner {

        whitelistedAddresses[_user] = true;

    }

    function addListOfUsersToWhitelist(address[] memory _users) public onlyOwner{

      for(uint i = 0; i < _users.length; i ++){

          whitelistedAddresses[_users[i]] = true;

      }

    }



    function setWhitelistStatus (bool _state) public onlyOwner {

      onlyWhitelisted=_state;

    }

    function isWhitelisted(address _user) public view returns (bool) {

        return whitelistedAddresses[_user];

    }

    //

    // contract info section 

    function totalSupply() public view returns (uint256) {

    return supplyBlack.current() + supplyBronze.current() + supplySilver.current() + supplyGold.current();

    }

    function BlackSupply() public view returns (uint256) {

      return supplyBlack.current();

    }

    function BronzeSupply() public view returns (uint256) {

      return supplyBronze.current();

    }

    function SilverSupply() public view returns (uint256) {

      return supplySilver.current();

    }  

    function GoldSupply() public view returns (uint256){

      return supplyGold.current();

    } 

    /* owner functions */

    function setCost(uint256 _cost, uint256 _nftType) public onlyOwner {

      if(_nftType == 1)

          costBlack = _cost;

      if(_nftType == 2)

          costBronze = _cost;

      if(_nftType == 3)

          costSilver = _cost;

      if(_nftType == 4)

          costGold = _cost;

    }

    function setPaused(bool _state) public onlyOwner {

      paused = _state;

    }

      function withdraw() public onlyOwner {

    // Do not remove this otherwise you will not be able to withdraw the funds.

    // =============================================================================

    (bool os, ) = payable(owner()).call{value: address(this).balance}("");

    require(os);

    // =============================================================================

  }

  //ipfs://bafybeihjjkwdrxxjnuwevlqtqmh3iegcadc32sio4wmo7bv2gbf34qs34a/

     function setBaseURI(string memory _newBaseURI) public onlyOwner {

    baseURI = _newBaseURI;

  }

   function uri(uint256 _tokenid) override public view returns (string memory) {

        return string(

            abi.encodePacked(

                baseURI,

                Strings.toString(_tokenid),".json"

            )

        );

    }

}