// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;
import "../UsdtLotteryRound.sol";
import "./ImmutableVrfAdapter.sol";

/// @notice Constructor-only atomic deployment. No operator can rebind an adapter or round.
contract UsdtRoundBootstrapper {
    address public immutable adapter;
    address public immutable round;
    error InvalidConfig();
    constructor(UsdtLotteryRound.Config memory c, ImmutableVrfAdapter.Config memory oracle) {
        if (c.randomness != address(0)) revert InvalidConfig();
        // New contract nonce starts at 1. Adapter is the first CREATE, round the second.
        address expectedRound = address(uint160(uint256(keccak256(abi.encodePacked(hex"d694", address(this), hex"02")))));
        adapter = address(new ImmutableVrfAdapter(expectedRound, oracle));
        c.randomness = adapter;
        address deployed = address(new UsdtLotteryRound(c));
        if (deployed != expectedRound) revert InvalidConfig();
        round = deployed;
    }
}