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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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/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;
    }
}

// File: contracts/interfaces/IUniqueTokenRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

interface IUniqueTokenRegistry {
    function getTokenIdByName(uint8 registry, string memory name) external view returns (uint);
    function getNameByTokenId(uint8 registry, uint tokenId) external view returns (string memory);
    function reserveTokenName(uint8 registry, string calldata name, uint tokenId) external;
    function transferOwnership(address owner) external;
}
// File: contracts/UniqueTokenRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IUniqueTokenRegistry.sol";

contract UniqueTokenRegistry is Ownable, IUniqueTokenRegistry {
    mapping(uint8 => mapping(uint => string)) _tokenIdToNames;
    mapping(uint8 => mapping(bytes32 => uint)) _tokenNamesToIds;

    event ClaimedName(uint8 indexed registry, string indexed name, uint indexed tokenId);
    event ReleasedName(uint8 indexed registry, string indexed name, uint indexed tokenId);

    error NameNotAvailableError(string name);

    function getTokenIdByName(uint8 registry, string memory name) public view override returns (uint) {
        return _tokenNamesToIds[registry][keccak256(bytes(name))];
    }

    function getNameByTokenId(uint8 registry, uint tokenId) public view override returns (string memory) {
        return _tokenIdToNames[registry][tokenId];
    }
    
    function reserveTokenName(uint8 registry, string calldata name, uint tokenId) public override onlyOwner {
        bytes32 _name = keccak256(bytes(name));

        if (_tokenNamesToIds[registry][_name] != 0) {
            revert NameNotAvailableError(name);
        }

        _tokenNamesToIds[registry][_name] = tokenId;
        _tokenIdToNames[registry][tokenId] = name;
        emit ClaimedName(registry, name, tokenId);
    }

    function transferOwnership(address owner) public virtual override(Ownable, IUniqueTokenRegistry) {
        return Ownable.transferOwnership(owner);
    }
}