pragma solidity 0.5.17;

/**
 * ENS registry test contract.
 */
contract EnsRegistry {

    struct Record {
        address owner;
        address resolver;
        uint64 ttl;
    }

    mapping(bytes32=>Record) records;

    // Logged when the owner of a node assigns a new owner to a subnode.
    event NewOwner(bytes32 indexed _node, bytes32 indexed _label, address _owner);

    // Logged when the owner of a node transfers ownership to a new account.
    event Transfer(bytes32 indexed _node, address _owner);

    // Logged when the resolver for a node changes.
    event NewResolver(bytes32 indexed _node, address _resolver);

    // Logged when the TTL of a node changes
    event NewTTL(bytes32 indexed _node, uint64 _ttl);

    // Permits modifications only by the owner of the specified node.
    modifier only_owner(bytes32 _node) {
        require(records[_node].owner == msg.sender, "ENSTest: this method needs to be called by the owner of the node");
        _;
    }

    /**
     * Constructs a new ENS registrar.
     */
    constructor() public {
        records[bytes32(0)].owner = msg.sender;
    }

    /**
     * Returns the address that owns the specified node.
     */
    function owner(bytes32 _node) public view returns (address) {
        return records[_node].owner;
    }

    /**
     * Returns the address of the resolver for the specified node.
     */
    function resolver(bytes32 _node) public view returns (address) {
        return records[_node].resolver;
    }

    /**
     * Returns the TTL of a node, and any records associated with it.
     */
    function ttl(bytes32 _node) public view returns (uint64) {
        return records[_node].ttl;
    }

    /**
     * Transfers ownership of a node to a new address. May only be called by the current
     * owner of the node.
     * @param _node The node to transfer ownership of.
     * @param _owner The address of the new owner.
     */
    function setOwner(bytes32 _node, address _owner) public only_owner(_node) {
        emit Transfer(_node, _owner);
        records[_node].owner = _owner;
    }

    /**
     * Transfers ownership of a subnode sha3(node, label) to a new address. May only be
     * called by the owner of the parent node.
     * @param _node The parent node.
     * @param _label The hash of the label specifying the subnode.
     * @param _owner The address of the new owner.
     */
    function setSubnodeOwner(bytes32 _node, bytes32 _label, address _owner) public only_owner(_node) {
        bytes32 subnode = keccak256(abi.encodePacked(_node, _label));
        emit NewOwner(_node, _label, _owner);
        records[subnode].owner = _owner;
    }

    /**
     * Sets the resolver address for the specified node.
     * @param _node The node to update.
     * @param _resolver The address of the resolver.
     */
    function setResolver(bytes32 _node, address _resolver) public only_owner(_node) {
        emit NewResolver(_node, _resolver);
        records[_node].resolver = _resolver;
    }

    /**
     * Sets the TTL for the specified node.
     * @param _node The node to update.
     * @param _ttl The TTL in seconds.
     */
    function setTTL(bytes32 _node, uint64 _ttl) public only_owner(_node) {
        emit NewTTL(_node, _ttl);
        records[_node].ttl = _ttl;
    }
}