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

/**
 * @title MockLightClient
 * @notice Mock light client for testing BridgeVault138 unlock functionality
 * @dev Always returns true for proof verification in tests
 */
contract MockLightClient {
    mapping(bytes32 => mapping(bytes32 => bool)) private _verifiedProofs;
    bool public alwaysVerify = true;

    /**
     * @notice Sets whether proofs should always verify
     * @param _alwaysVerify If true, all proofs verify; if false, only pre-registered proofs verify
     */
    function setAlwaysVerify(bool _alwaysVerify) external {
        alwaysVerify = _alwaysVerify;
    }

    /**
     * @notice Registers a proof as verified for testing
     * @param sourceChain Source chain identifier
     * @param sourceTx Source transaction hash
     */
    function registerProof(bytes32 sourceChain, bytes32 sourceTx) external {
        _verifiedProofs[sourceChain][sourceTx] = true;
    }

    /**
     * @notice Verifies a proof
     * @param sourceChain Source chain identifier
     * @param sourceTx Source transaction hash
     * @param proof Proof data (unused in mock)
     * @return true if proof is verified, false otherwise
     */
    function verifyProof(
        bytes32 sourceChain,
        bytes32 sourceTx,
        bytes calldata proof
    ) external view returns (bool) {
        if (alwaysVerify) {
            return true;
        }
        return _verifiedProofs[sourceChain][sourceTx];
    }
}