// File: contracts/ERC1155Purchases.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./structs/ProductToken.sol";
import "./extensions/Purchasable/SlicerPurchasable.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";

contract ERC1155Purchases is SlicerPurchasable, ERC1155Receiver, Ownable {
    error Invalid();

    /// ============ Storage ============

    // Mapping from Product ID to erc1155 tokenId
    mapping(uint256 => ProductToken) private _productTokens;

    /// ========== Constructor ===========
    constructor(address productsModuleAddress_, uint256 slicerId_)
        SlicerPurchasable(productsModuleAddress_, slicerId_)
    {}

    /// ============ Functions ============

    /**
     * @notice Overridable function containing the requirements for an account to be eligible for the purchase.
     * Contains both allowlist and token-gate mechanic, which can be enabled using `setTokenToProduct`
     *
     * @dev Used on the Slice interface to check whether a user is able to buy a product. See {ISlicerPurchasable}.
     * @dev Max quantity purchasable per address and total mint amount is handled on Slicer product logic
     */
    function isPurchaseAllowed(
        uint256,
        uint256 productId,
        address account,
        uint256,
        bytes memory,
        bytes memory buyerCustomData
    ) public view override returns (bool isAllowed) {
        // Product sales allowed by default
        isAllowed = true;

        // If an erc20 gate has been setup
        if (_productTokens[productId].erc20 != IERC20(address(0))) {
            // Check if buyer has enough tokens
            isAllowed =
                _productTokens[productId].erc20.balanceOf(account) >=
                _productTokens[productId].gateAmount;
        }

        // If a merkle root has been setup
        if (isAllowed && _productTokens[productId].merkleRoot != "") {
            // Get Merkle proof from buyerCustomData
            bytes32[] memory proof = abi.decode(buyerCustomData, (bytes32[]));

            // Generate leaf from account address
            bytes32 leaf = keccak256(abi.encodePacked(account));

            // Check if Merkle proof is valid
            isAllowed = MerkleProof.verify(proof, _productTokens[productId].merkleRoot, leaf);
        }
    }

    /**
     * @notice Transfers one or more ERC1155 tokens owned by the contract to the buyer `account`.
     *
     * @dev Overridable function to handle external calls on product purchases from slicers. See {ISlicerPurchasable}
     */
    function onProductPurchase(
        uint256 slicerId,
        uint256 productId,
        address account,
        uint256 quantity,
        bytes memory slicerCustomData,
        bytes memory buyerCustomData
    ) external payable override onlyOnPurchaseFrom(slicerId) {
        // Check whether the account is allowed to buy a product.
        if (
            !isPurchaseAllowed(
                slicerId,
                productId,
                account,
                quantity,
                slicerCustomData,
                buyerCustomData
            )
        ) revert NotAllowed();

        // Add product purchase logic here
        ProductToken memory p = _productTokens[productId];

        uint256[] memory amounts = new uint256[](p.tokenIds.length);

        for (uint256 i; i < p.tokenIds.length; ) {
            amounts[i] = quantity;
            unchecked {
                ++i;
            }
        }

        p.contractAddress.safeBatchTransferFrom(address(this), account, p.tokenIds, amounts, "");
    }

    /**
     * @notice Sets a `productId` to execute the transfer of a certain `tokenId`, allowing to optionally
     * add `merkleRoot` to enable allowlist, or `erc20` and `gateAmount` to enable token-gating
     *
     * @dev Can only be called by contract owner
     */
    function setTokenToProduct(
        uint256 productId,
        IERC1155 erc1155,
        uint256[] calldata tokenIds,
        bytes32 merkleRoot,
        IERC20 erc20,
        uint256 gateAmount
    ) external onlyOwner {
        _productTokens[productId] = ProductToken(erc1155, tokenIds, merkleRoot, erc20, gateAmount);
    }

    /**
     * @notice Sends to owner an `amount` of tokens of `erc1155` contract and `tokenId`.
     *
     * @dev Can only be called by contract owner
     */
    function withdrawTokens(
        IERC1155 erc1155,
        uint256 tokenId,
        uint256 amount
    ) external onlyOwner {
        erc1155.safeTransferFrom(address(this), owner(), tokenId, amount, "");
    }

    /**
     * @notice Function called when ERC1155 tokens are received
     */
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes calldata
    ) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    /**
     * @dev See `onERC1155Received`
     */
    function onERC1155BatchReceived(
        address,
        address,
        uint256[] calldata,
        uint256[] calldata,
        bytes calldata
    ) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}

// File: contracts/structs/ProductToken.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/interfaces/IERC1155.sol";

struct ProductToken {
    IERC1155 contractAddress;
    uint256[] tokenIds;
    bytes32 merkleRoot;
    IERC20 erc20;
    uint256 gateAmount;
}

// File: contracts/extensions/Purchasable/SlicerPurchasable.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "../../interfaces/extensions/Purchasable/ISlicerPurchasable.sol";

/**
 * @title SlicerPurchasable
 * @author jjranalli
 *
 * @notice Extension enabling basic usage of external calls by slicers upon product purchase.
 */
abstract contract SlicerPurchasable is ISlicerPurchasable {
    /// ============ Errors ============

    /// @notice Thrown if not called from the correct slicer
    error WrongSlicer();
    /// @notice Thrown if not called during product purchase
    error NotPurchase();
    /// @notice Thrown when account is not allowed to buy product
    error NotAllowed();
    /// @notice Thrown when a critical request was not successful
    error NotSuccessful();

    /// ============ Storage ============

    /// ProductsModule contract address
    address internal _productsModuleAddress;
    /// Id of the slicer able to call the functions with the `OnlyOnPurchaseFrom` function
    uint256 internal immutable _slicerId;

    /// ============ Constructor ============

    /**
     * @notice Initializes the contract.
     *
     * @param productsModuleAddress_ {ProductsModule} address
     * @param slicerId_ ID of the slicer linked to this contract
     */
    constructor(address productsModuleAddress_, uint256 slicerId_) {
        _productsModuleAddress = productsModuleAddress_;
        _slicerId = slicerId_;
    }

    /// ============ Modifiers ============

    /**
     * @notice Checks product purchases are accepted only from correct slicer (modifier)
     */
    modifier onlyOnPurchaseFrom(uint256 slicerId) {
        _onlyOnPurchaseFrom(slicerId);
        _;
    }

    /// ============ Functions ============

    /**
     * @notice Checks product purchases are accepted only from correct slicer (function)
     */
    function _onlyOnPurchaseFrom(uint256 slicerId) internal view virtual {
        if (_slicerId != slicerId) revert WrongSlicer();
        if (msg.sender != _productsModuleAddress) revert NotPurchase();
    }

    /**
     * @notice Overridable function containing the requirements for an account to be eligible for the purchase.
     *
     * @dev Used on the Slice interface to check whether a user is able to buy a product. See {ISlicerPurchasable}.
     */
    function isPurchaseAllowed(
        uint256,
        uint256,
        address,
        uint256,
        bytes memory,
        bytes memory
    ) public view virtual override returns (bool) {
        // Add all requirements related to product purchase here
        // Return true if account is allowed to buy product
        return true;
    }

    /**
     * @notice Overridable function to handle external calls on product purchases from slicers. See {ISlicerPurchasable}
     *
     * @dev Can be inherited by child contracts to add custom logic on product purchases.
     */
    function onProductPurchase(
        uint256 slicerId,
        uint256 productId,
        address account,
        uint256 quantity,
        bytes memory slicerCustomData,
        bytes memory buyerCustomData
    ) external payable virtual override onlyOnPurchaseFrom(slicerId) {
        // Check whether the account is allowed to buy a product.
        if (
            !isPurchaseAllowed(
                slicerId,
                productId,
                account,
                quantity,
                slicerCustomData,
                buyerCustomData
            )
        ) revert NotAllowed();

        // Add product purchase logic here
    }
}

// File: @openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/utils/ERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../IERC1155Receiver.sol";
import "../../../utils/introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merklee tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     *
     * _Available since v4.4._
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];
            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = _efficientHash(computedHash, proofElement);
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = _efficientHash(proofElement, computedHash);
            }
        }
        return computedHash;
    }

    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// File: @openzeppelin/contracts/interfaces/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

// File: @openzeppelin/contracts/interfaces/IERC1155.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1155.sol)

pragma solidity ^0.8.0;

import "../token/ERC1155/IERC1155.sol";

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        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/token/ERC1155/IERC1155.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

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

/**
 * @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/utils/introspection/IERC165.sol



// SPDX-License-Identifier: MIT
// 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: contracts/interfaces/extensions/Purchasable/ISlicerPurchasable.sol



// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

interface ISlicerPurchasable {
    /**
     * @notice Overridable function containing the requirements for an account to be eligible for the purchase.
     *
     * @param slicerId ID of the slicer calling the function
     * @param productId ID of the product being purchased
     * @param account Address of the account buying the product
     * @param quantity Amount of products being purchased
     * @param slicerCustomData Custom data sent by slicer during product purchase
     * @param buyerCustomData Custom data sent by buyer during product purchase
     *
     * @dev Used on the Slice interface to check whether a user is able to buy a product.
     */
    function isPurchaseAllowed(
        uint256 slicerId,
        uint256 productId,
        address account,
        uint256 quantity,
        bytes memory slicerCustomData,
        bytes memory buyerCustomData
    ) external view returns (bool);

    /**
     * @notice Overridable function to handle external calls on product purchases from slicers.
     *
     * @param slicerId ID of the slicer calling the function
     * @param productId ID of the product being purchased
     * @param account Address of the account buying the product
     * @param quantity Amount of products being purchased
     * @param slicerCustomData Custom data sent by slicer during product purchase
     * @param buyerCustomData Custom data sent by buyer during product purchase
     *
     * @dev Can be inherited by child contracts to add custom logic on product purchases.
     */
    function onProductPurchase(
        uint256 slicerId,
        uint256 productId,
        address account,
        uint256 quantity,
        bytes memory slicerCustomData,
        bytes memory buyerCustomData
    ) external payable;
}

// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

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

/**
 * @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/utils/introspection/ERC165.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @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/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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;
    }
}