pragma solidity >=0.8.4;

import "./ENS.sol";

/// A registrar that allocates subdomains to the first person to claim them, but
/// expires registrations a fixed period after they're initially claimed.
contract TestRegistrar {
    uint256 constant registrationPeriod = 4 weeks;

    ENS public immutable ens;
    bytes32 public immutable rootNode;
    mapping(bytes32 => uint256) public expiryTimes;

    /// Constructor.
    /// @param ensAddr The address of the ENS registry.
    /// @param node The node that this registrar administers.
    constructor(ENS ensAddr, bytes32 node) {
        ens = ensAddr;
        rootNode = node;
    }

    /// Register a name that's not currently registered
    /// @param label The hash of the label to register.
    /// @param owner The address of the new owner.
    function register(bytes32 label, address owner) public {
        require(expiryTimes[label] < block.timestamp);

        expiryTimes[label] = block.timestamp + registrationPeriod;
        ens.setSubnodeOwner(rootNode, label, owner);
    }
}