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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (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. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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/registry/SNS.sol



// SPDX-License-Identifier: MIT
pragma solidity >=0.8.4;

interface SNS {
  event NewOwner(bytes32 indexed node, bytes32 indexed label, address owner);

  event Transfer(bytes32 indexed node, address owner);

  event NewResolver(bytes32 indexed node, address resolver);

  event NewTTL(bytes32 indexed node, uint64 ttl);

  event ApprovalForAll(
    address indexed owner,
    address indexed operator,
    bool approved
  );

  function setRecord(
    bytes32 node,
    address owner,
    address resolver,
    uint64 ttl
  ) external;

  function setSubnodeRecord(
    bytes32 node,
    bytes32 label,
    address owner,
    address resolver,
    uint64 ttl
  ) external;

  function setSubnodeOwner(
    bytes32 node,
    bytes32 label,
    address owner
  ) external returns (bytes32);

  function setResolver(bytes32 node, address resolver) external;

  function setOwner(bytes32 node, address owner) external;

  function setTTL(bytes32 node, uint64 ttl) external;

  function setApprovalForAll(address operator, bool approved) external;

  function owner(bytes32 node) external view returns (address);

  function resolver(bytes32 node) external view returns (address);

  function ttl(bytes32 node) external view returns (uint64);

  function recordExists(bytes32 node) external view returns (bool);

  function isApprovedForAll(
    address owner,
    address operator
  ) external view returns (bool);
}

// File: contracts/root/Controllable.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

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

contract Controllable is Ownable {
  mapping(address => bool) public controllers;

  event ControllerChanged(address indexed controller, bool enabled);

  modifier onlyController() {
    require(
      controllers[msg.sender],
      "Controllable: Caller is not a controller"
    );
    _;
  }

  function setController(address controller, bool enabled) public onlyOwner {
    controllers[controller] = enabled;
    emit ControllerChanged(controller, enabled);
  }
}

// File: contracts/root/Root.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "../registry/SNS.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./Controllable.sol";

contract Root is Ownable, Controllable {
  bytes32 private constant ROOT_NODE = bytes32(0);

  bytes4 private constant INTERFACE_META_ID =
    bytes4(keccak256("supportsInterface(bytes4)"));

  event TLDLocked(bytes32 indexed label);

  SNS public sns;
  mapping(bytes32 => bool) public locked;

  constructor(SNS _sns) {
    sns = _sns;
  }

  function setSubnodeOwner(
    bytes32 label,
    address owner
  ) external onlyController {
    require(!locked[label]);
    sns.setSubnodeOwner(ROOT_NODE, label, owner);
  }

  function setResolver(address resolver) external onlyOwner {
    sns.setResolver(ROOT_NODE, resolver);
  }

  function lock(bytes32 label) external onlyOwner {
    emit TLDLocked(label);
    locked[label] = true;
  }

  function supportsInterface(bytes4 interfaceID) external pure returns (bool) {
    return interfaceID == INTERFACE_META_ID;
  }
}