// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

/**
 * @title RiscZeroVerifier
 * @notice A verifier contract for RISC Zero proofs
 * @dev This is a simplified verifier that validates RISC Zero proof format
 *      In production, this would integrate with the actual RISC Zero verifier
 */
contract RiscZeroVerifier {
    
    /// @notice Verifies a RISC Zero proof
    /// @param proof The proof bytes
    /// @param journalHash The hash of the journal (public outputs)
    /// @param sealHash The hash of the seal
    /// @return True if the proof is valid
    function verify(
        bytes calldata proof,
        bytes32 journalHash,
        bytes32 sealHash
    ) external pure returns (bool) {
        return _verify(proof, journalHash, sealHash);
    }
    
    /// @notice Internal verification logic
    /// @param proof The proof bytes
    /// @param journalHash The hash of the journal (public outputs)
    /// @param sealHash The hash of the seal
    /// @return True if the proof is valid
    function _verify(
        bytes calldata proof,
        bytes32 journalHash,
        bytes32 sealHash
    ) internal pure returns (bool) {
        // Basic validation - ensure proof is not empty
        if (proof.length == 0) {
            return false;
        }
        
        // Basic validation - ensure hashes are not zero
        if (journalHash == bytes32(0) || sealHash == bytes32(0)) {
            return false;
        }
        
        // In a real implementation, this would:
        // 1. Verify the proof against the RISC Zero verifier
        // 2. Check that the journal hash matches the committed outputs
        // 3. Validate the seal hash
        
        // For now, we'll do basic format validation
        // The proof should be at least 32 bytes (simplified check)
        return proof.length >= 32;
    }
    
    /// @notice Verifies a RISC Zero proof with method ID
    /// @param proof The proof bytes
    /// @param journalHash The hash of the journal (public outputs)
    /// @param sealHash The hash of the seal
    /// @param methodId The method ID that generated this proof
    /// @return True if the proof is valid
    function verifyWithMethodId(
        bytes calldata proof,
        bytes32 journalHash,
        bytes32 sealHash,
        bytes32 methodId
    ) external pure returns (bool) {
        // Verify the basic proof first
        if (!_verify(proof, journalHash, sealHash)) {
            return false;
        }
        
        // Ensure method ID is not zero
        if (methodId == bytes32(0)) {
            return false;
        }
        
        // In a real implementation, this would verify that the proof
        // was generated by the specific method ID
        return true;
    }
}