// SPDX-License-Identifier: MIT

pragma solidity >=0.7.6 <0.8.0;

/**
 * @title ERC1155 Multi Token Standard, basic interface.
 * @dev See https://eips.ethereum.org/EIPS/eip-1155
 * @dev Note: The ERC-165 identifier for this interface is 0xd9b67a26.
 */
interface IERC1155 {
    event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _value);

    event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _values);

    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

    event URI(string _value, uint256 indexed _id);

    /**
     * Safely transfers some token.
     * @dev Reverts if `to` is the zero address.
     * @dev Reverts if the sender is not approved.
     * @dev Reverts if `from` has an insufficient balance.
     * @dev Reverts if `to` is a contract and the call to {IERC1155TokenReceiver-onERC1155received} fails or is refused.
     * @dev Emits a `TransferSingle` event.
     * @param from Current token owner.
     * @param to Address of the new token owner.
     * @param id Identifier of the token to transfer.
     * @param value Amount of token to transfer.
     * @param data Optional data to send along to a receiver contract.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external;

    /**
     * Safely transfers a batch of tokens.
     * @dev Reverts if `to` is the zero address.
     * @dev Reverts if `ids` and `values` have different lengths.
     * @dev Reverts if the sender is not approved.
     * @dev Reverts if `from` has an insufficient balance for any of `ids`.
     * @dev Reverts if `to` is a contract and the call to {IERC1155TokenReceiver-onERC1155batchReceived} fails or is refused.
     * @dev Emits a `TransferBatch` event.
     * @param from Current token owner.
     * @param to Address of the new token owner.
     * @param ids Identifiers of the tokens to transfer.
     * @param values Amounts of tokens to transfer.
     * @param data Optional data to send along to a receiver contract.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external;

    /**
     * Retrieves the balance of `id` owned by account `owner`.
     * @param owner The account to retrieve the balance of.
     * @param id The identifier to retrieve the balance of.
     * @return The balance of `id` owned by account `owner`.
     */
    function balanceOf(address owner, uint256 id) external view returns (uint256);

    /**
     * Retrieves the balances of `ids` owned by accounts `owners`. For each pair:
     * @dev Reverts if `owners` and `ids` have different lengths.
     * @param owners The addresses of the token holders
     * @param ids The identifiers to retrieve the balance of.
     * @return The balances of `ids` owned by accounts `owners`.
     */
    function balanceOfBatch(address[] calldata owners, uint256[] calldata ids) external view returns (uint256[] memory);

    /**
     * Enables or disables an operator's approval.
     * @dev Emits an `ApprovalForAll` event.
     * @param operator Address of the operator.
     * @param approved True to approve the operator, false to revoke an approval.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * Retrieves the approval status of an operator for a given owner.
     * @param owner Address of the authorisation giver.
     * @param operator Address of the operator.
     * @return True if the operator is approved, false if not.
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}