// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "./interfaces/IWLPProgramEvents.sol";

/**
 * @title Chain138LPLocker
 * @notice Escrows DODO PMM LP ERC20 on Chain 138; releases only to BRIDGE_RELEASE_ROLE (Option A).
 * @dev Per-lock `lockRef` is used as the cross-chain idempotency key for destination mint.
 *      One deployment typically corresponds to one `lpToken` (one pool’s LP token).
 */
contract Chain138LPLocker is AccessControl, IWLPProgramEvents {
    using SafeERC20 for IERC20;

    bytes32 public constant BRIDGE_RELEASE_ROLE = keccak256("BRIDGE_RELEASE_ROLE");

    IERC20 public immutable lpToken;

    struct Deposit {
        address depositor;
        uint256 amount;
        bool released;
    }

    uint256 public lockCounter;
    uint256 public totalEscrowed;

    mapping(bytes32 => Deposit) public deposits;

    constructor(address lpToken_, address admin) {
        require(lpToken_ != address(0) && admin != address(0), "Locker: zero");
        lpToken = IERC20(lpToken_);
        _grantRole(DEFAULT_ADMIN_ROLE, admin);
    }

    /**
     * @notice Lock LP into escrow; `lockRef` must be relayed to the public chain for mint.
     */
    function deposit(uint256 amount) external returns (bytes32 lockRef) {
        require(amount > 0, "Locker: zero amount");
        lpToken.safeTransferFrom(msg.sender, address(this), amount);
        lockRef = keccak256(abi.encode(block.chainid, address(this), lockCounter++, msg.sender, amount));
        deposits[lockRef] = Deposit({depositor: msg.sender, amount: amount, released: false});
        totalEscrowed += amount;
        emit LPLocked(lockRef, msg.sender, amount, address(lpToken));
    }

    /**
     * @notice Release one full lock to `to` after redemption message (or operational unwind).
     */
    function releaseLock(bytes32 lockRef, address to) external onlyRole(BRIDGE_RELEASE_ROLE) {
        Deposit storage d = deposits[lockRef];
        require(d.amount > 0 && !d.released, "Locker: bad lock");
        d.released = true;
        uint256 amt = d.amount;
        totalEscrowed -= amt;
        lpToken.safeTransfer(to, amt);
        emit LPReleased(lockRef, to, amt, address(lpToken));
    }

    /**
     * @notice Aggregate release for pro-rata / FIFO policies (requires off-chain ordering).
     */
    function releaseAmount(address to, uint256 amount) external onlyRole(BRIDGE_RELEASE_ROLE) {
        require(amount > 0 && amount <= totalEscrowed, "Locker: amount");
        totalEscrowed -= amount;
        lpToken.safeTransfer(to, amount);
        emit LPReleased(bytes32(0), to, amount, address(lpToken));
    }
}