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// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "./IMPC.sol";
import "./ICross.sol";

/**
 * @title GroupApprove
 * @dev Contract that implements a multi-signature governance mechanism for cross-chain operations
 * where proposals require approval from a storeman group before execution
 *
 * @custom:architecture This contract acts as a governance layer for critical cross-chain operations,
 * requiring both foundation proposal and storeman group approval for actions
 */
contract GroupApprove {
    /**
     * @dev Structure representing an executable task
     * @param to Target contract address to call
     * @param data Call data to be executed
     * @param executed Flag indicating if the task has been executed
     */
    struct Task {
        address to;
        bytes data;
        bool executed;
    }

    /**
     * @dev Structure for signature verification data
     * @param sigHash Hash of the message being signed
     * @param smgID Storeman group ID that signed the message
     * @param r R component of the signature (contains X and Y coordinates)
     * @param s S component of the signature
     */
    struct SigData {
        bytes32 sigHash;
        bytes32 smgID; 
        bytes r;
        bytes32 s;
    }

    // slip-0044 chainId
    uint256 public chainId;
    uint256 public taskCount;
    address public foundation;
    address public signatureVerifier;
    address public oracle;

    // proposalId => task
    mapping(uint256 => Task) public tasks;

    /**
     * @dev Enum representing various states a storeman group can be in
     */
    enum GroupStatus { none, initial, curveSet, failed, selected, ready, unregistered, dismissed }

    /**
     * @dev Restricts function access to the foundation address
     */
    modifier onlyFoundation() {
        require(msg.sender == foundation, "not foundation");
        _;
    }

    /**
     * @dev Restricts function access to the contract itself
     * Used for functions that should only be called via executing a task
     */
    modifier onlySelf() {
        require(msg.sender == address(this), "not self");
        _;
    }

    /**
     * @dev Validates signature from a storeman group before executing a function
     * @param proposalId ID of the proposal being approved
     * @param smgID ID of the storeman group signing the approval
     * @param r R component of the signature
     * @param s S component of the signature
     */
    modifier onlySmg(uint proposalId, bytes32 smgID, bytes calldata r, bytes32 s) {
        bytes32 sigHash = keccak256(abi.encode(proposalId, chainId));
        _verifyMpcSignature(
            SigData(
                sigHash, smgID, r, s
            )
        );
        _;
    }

    /**
     * @dev Emitted when a new proposal is created
     * @param proposalId Unique identifier for the proposal
     * @param to Target contract address to call
     * @param data Call data to be executed
     */
    event Proposal(
        uint256 indexed proposalId, 
        address indexed to, 
        bytes data
    );

    /**
     * @dev Emitted when a proposal is approved and executed
     * @param proposalId Unique identifier for the proposal
     * @param to Target contract address that was called
     * @param data Call data that was executed
     * @param smgID ID of the storeman group that approved the proposal
     */
    event ApprovedAndExecuted(
        uint256 indexed proposalId, 
        address indexed to, 
        bytes data,
        bytes32 smgID
    );

    /**
     * @dev Emitted when the foundation address is transferred
     * @param oldFoundation Previous foundation address
     * @param newFoundation New foundation address
     */
    event TransferFoundation(
        address indexed oldFoundation, 
        address indexed newFoundation
    );

    /**
     * @dev Error thrown when signature verification fails
     * @param smgID ID of the storeman group
     * @param sigHash Hash of the signed message
     * @param r R component of the signature
     * @param s S component of the signature
     */
    error SignatureVerifyFailed(
        bytes32 smgID,
        bytes32 sigHash,
        bytes r,
        bytes32 s
    );

    /**
     * @dev Error thrown when a storeman group is not in ready state
     * @param smgID ID of the storeman group
     * @param status Current status of the storeman group
     * @param timestamp Current block timestamp
     * @param startTime Start time of the storeman group
     * @param endTime End time of the storeman group
     */
    error StoremanGroupNotReady(
        bytes32 smgID,
        uint256 status,
        uint256 timestamp,
        uint256 startTime,
        uint256 endTime
    );
    
    /**
     * @dev Constructor initializes the contract with key addresses and validates cross-chain configuration
     * @param _foundation Address of the foundation that can create proposals
     * @param _signatureVerifier Address of the contract used to verify signatures
     * @param _oracle Address of the oracle contract that provides storeman group information
     * @param _cross Address of the cross-chain bridge contract
     *
     * @notice Validates that the provided oracle and signatureVerifier match the ones in the cross contract
     */
    constructor(address _foundation, address _signatureVerifier, address _oracle, address _cross) {
        require(_foundation != address(0), "foundation is empty");
        address _oracleCross;
        address _signatureVerifierCross;

        // cross check oracle and signatureVerifier address with cross contract
        (, _oracleCross, , , _signatureVerifierCross) = ICross(_cross).getPartners();
        oracle = _oracle;
        signatureVerifier = _signatureVerifier;
        require(_oracle == _oracleCross, "oracle not match");
        require(_signatureVerifier == _signatureVerifierCross, "signatureVerifier not match");

        chainId = ICross(_cross).currentChainID(); // read from cross
        require(chainId != 0, "chainId is empty");

        foundation = _foundation;
    }

    /**
     * @dev Creates a new proposal to be executed after storeman group approval
     * @param _chainId Chain ID for which the proposal is intended
     * @param _to Target contract address to call
     * @param _data Call data to be executed
     *
     * @notice Only the foundation can create proposals
     * @notice The chain ID must match the current chain ID
     */
    function proposal(
        uint256 _chainId,
        address _to, 
        bytes memory _data
    ) external onlyFoundation {
        require(_data.length > 0, "data is empty");
        require(_to != address(0), "to is empty");
        require(_chainId == chainId, "chainId not match");

        // save task 
        tasks[taskCount] = Task(_to, _data, false);
        emit Proposal(taskCount, _to, _data);
        taskCount++;
    }

    /**
     * @dev Approves and executes a proposal with storeman group signature
     * @param proposalId ID of the proposal to execute
     * @param smgID ID of the storeman group providing approval
     * @param r R component of the signature
     * @param s S component of the signature
     *
     * @notice Requires valid signature from an active storeman group
     * @notice The task must not have been executed before
     */
    function approveAndExecute(
        uint256 proposalId,
        bytes32 smgID,
        bytes calldata r,
        bytes32 s
    ) external onlySmg(proposalId, smgID, r, s) {
        Task storage task = tasks[proposalId];
        require(task.to != address(0), "task not exists");
        require(!task.executed, "task already executed");

        (bool success, ) = task.to.call(task.data);
        require(success, "call failed");
        task.executed = true;
        emit ApprovedAndExecuted(proposalId, task.to, task.data, smgID);
    }

    /**
     * @dev Sets the halt status of a cross-chain contract
     * @param _to Address of the cross-chain contract to halt or resume
     * @param _halt True to halt, false to resume
     *
     * @notice Only the foundation can call this function
     */
    function halt(address _to, bool _halt) external onlyFoundation {
        ICross(_to).setHalt(_halt);
    }

    /**
     * @dev Transfers the foundation role to a new address
     * @param _newFoundation Address of the new foundation
     *
     * @notice This function can only be called through executing a task
     * @notice Ensures security by requiring both foundation proposal and storeman approval
     */
    function transferFoundation(address _newFoundation) external onlySelf {
        require(_newFoundation != address(0), "new foundation is empty");
        require(_newFoundation != foundation, "new foundation is same as old");
        foundation = _newFoundation;
        emit TransferFoundation(foundation, _newFoundation);
    }

    // -------- internal functions --------

    /**
     * @notice Check if a storeman group is ready and retrieve its cryptographic information
     * @param smgID ID of the storeman group to check
     * @return curveID ID of the elliptic curve used by the storeman group
     * @return PK Public key of the storeman group
     *
     * @dev Reverts if the storeman group is not in ready state or outside its active time window
     */
    function _acquireReadySmgInfo(bytes32 smgID)
        internal
        view
        returns (uint curveID, bytes memory PK)
    {
        uint8 status;
        uint startTime;
        uint endTime;
        (,status,,,,curveID,,PK,,startTime,endTime) = IMPC(oracle).getStoremanGroupConfig(smgID);

        if (!(status == uint8(GroupStatus.ready) && block.timestamp >= startTime && block.timestamp <= endTime)) {
            revert StoremanGroupNotReady({
                smgID: smgID,
                status: uint256(status),
                timestamp: block.timestamp,
                startTime: startTime,
                endTime: endTime
            });
        }

        return (curveID, PK);
    }

    /**
     * @notice Convert bytes to bytes32 at a specific offset
     * @param b Bytes array to convert
     * @param offset Offset in the bytes array
     * @return result The bytes32 value at the specified offset
     * 
     * @dev Uses assembly for gas-efficient conversion
     */
    function _bytesToBytes32(bytes memory b, uint offset) internal pure returns (bytes32 result) {
        assembly {
            result := mload(add(add(b, offset), 32))
        }
    }

    /**
     * @dev Verifies an MPC signature for a given message and Storeman Group ID
     * @param sig The signature data structure containing all verification components
     *
     * @dev Reverts with SignatureVerifyFailed if verification fails
     * @dev Uses the external signature verifier contract for the actual verification
     */
    function _verifyMpcSignature(SigData memory sig) internal {
        uint curveID;
        bytes memory PK;

        // Acquire the curve ID and group public key for the given Storeman Group ID
        (curveID, PK) = _acquireReadySmgInfo(sig.smgID);

        // Extract the X and Y components of the group public key
        bytes32 PKx = _bytesToBytes32(PK, 0);
        bytes32 PKy = _bytesToBytes32(PK, 32);

        // Extract the X and Y components of the signature
        bytes32 Rx = _bytesToBytes32(sig.r, 0);
        bytes32 Ry = _bytesToBytes32(sig.r, 32);

        // Verify the signature using the Wanchain MPC contract
        if (!IMPC(signatureVerifier).verify(curveID, sig.s, PKx, PKy, Rx, Ry, sig.sigHash)) {
            revert SignatureVerifyFailed({
                smgID: sig.smgID,
                sigHash: sig.sigHash,
                r: sig.r,
                s: sig.s
            });
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

/**
 * @title ICross
 * @dev Interface for the cross-chain functionality contract that handles asset transfers and communication between chains
 * 
 * @custom:key-features
 * - Enable/disable cross-chain functionality
 * - Get related contract addresses
 * - Get current chain ID information
 */
interface ICross {
    /**
     * @dev Sets the halt status of the cross-chain contract
     * 
     * @param halt true to halt cross-chain functionality, false to resume
     */
    function setHalt(bool halt) external;
    
    /**
     * @dev Gets the addresses of related contracts in the cross-chain system
     * 
     * @return tokenManager Token manager contract address
     * @return smgAdminProxy Storeman group admin proxy contract address
     * @return smgFeeProxy Storeman group fee proxy contract address
     * @return quota Quota management contract address
     * @return sigVerifier Signature verification contract address
     * 
     * @custom:usage
     * - Used to verify key contract addresses
     * - Ensures system component consistency
     */
    function getPartners() external view returns(address tokenManager, address smgAdminProxy, address smgFeeProxy, address quota, address sigVerifier);
    
    /**
     * @dev Gets the ID of the current blockchain
     * 
     * @return uint256 The unique identifier of the current blockchain
     * 
     * @custom:usage
     * - Used in cross-chain transactions to verify target chains
     * - Ensures messages are sent to the correct target chain
     */
    function currentChainID() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

/**
 * @title IMPC
 * @dev Interface for Multi-Party Computation (MPC) operations related to storeman groups
 * 
 * @custom:key-features
 * - Storeman group configuration retrieval
 * - Threshold signature verification
 * - Cross-chain security validation
 * 
 * @custom:security
 * - Cryptographic signature verification
 * - Elliptic curve operations
 * - Group public key management
 */
interface IMPC {
    /**
     * @dev Retrieves the configuration of a Storeman Group by ID
     * @param id The ID of the Storeman Group to retrieve
     * @return groupId The group ID of the Storeman Group
     * @return status The status of the Storeman Group
     * @return deposit The deposit amount of the Storeman Group
     * @return chain1 The ID of the first chain supported by the Storeman Group
     * @return chain2 The ID of the second chain supported by the Storeman Group
     * @return curve1 The ID of the first elliptic curve supported by the Storeman Group
     * @return curve2 The ID of the second elliptic curve supported by the Storeman Group
     * @return gpk1 The Group Public Key for the first elliptic curve
     * @return gpk2 The Group Public Key for the second elliptic curve
     * @return startTime The start time of the Storeman Group
     * @return endTime The end time of the Storeman Group
     * 
     * @custom:usage
     * - Used to validate storeman group status
     * - Provides cryptographic parameters for signature verification
     * - Ensures group is active within its time window
     */
    function getStoremanGroupConfig(
        bytes32 id
    ) external view returns (
        bytes32 groupId,
        uint8 status,
        uint deposit,
        uint chain1,
        uint chain2,
        uint curve1,
        uint curve2,
        bytes memory gpk1,
        bytes memory gpk2,
        uint startTime,
        uint endTime
    );

    /**
     * @dev Verifies a signature using the provided parameters
     * @param curveId The ID of the elliptic curve used for the signature
     * @param signature The signature to be verified
     * @param groupKeyX The X component of the group public key
     * @param groupKeyY The Y component of the group public key
     * @param randomPointX The X component of the random point
     * @param randomPointY The Y component of the random point
     * @param message The message that was signed
     * @return true if the signature is valid, false otherwise
     * 
     * @custom:security
     * - Performs threshold signature verification
     * - Uses secure elliptic curve cryptography
     * - Critical for cross-chain message authentication
     * - Protects against signature forgery attacks
     */
    function verify(
        uint curveId,
        bytes32 signature,
        bytes32 groupKeyX,
        bytes32 groupKeyY,
        bytes32 randomPointX,
        bytes32 randomPointY,
        bytes32 message
    ) external returns (bool);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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00000000000000000000000005caf88ff0b089a9f31ea7275bcaa90f8ad90fb900000000000000000000000086ec03f7bafab24f69ebc456cc429b6f389ea4e4000000000000000000000000e0c8c2fdc6fc440bd1ec918299585321494536ff0000000000000000000000009c11539603661b6c90e65e96aa8ac4b8e4b914c8

-----Decoded View---------------
Arg [0] : _foundation (address): 0x05CAF88FF0b089a9F31eA7275BCAA90F8Ad90fB9
Arg [1] : _signatureVerifier (address): 0x86Ec03F7BaFAB24f69EBc456cC429b6F389EA4e4
Arg [2] : _oracle (address): 0xe0C8c2fDc6fc440BD1eC918299585321494536Ff
Arg [3] : _cross (address): 0x9C11539603661b6c90E65E96Aa8aC4B8E4b914c8

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 00000000000000000000000005caf88ff0b089a9f31ea7275bcaa90f8ad90fb9
Arg [1] : 00000000000000000000000086ec03f7bafab24f69ebc456cc429b6f389ea4e4
Arg [2] : 000000000000000000000000e0c8c2fdc6fc440bd1ec918299585321494536ff
Arg [3] : 0000000000000000000000009c11539603661b6c90e65e96aa8ac4b8e4b914c8