import time
import hmac
import hashlib
from dataclasses import dataclass
from typing import Dict, Any


@dataclass
class DID:
    did: str
    key: str  # simple shared-secret for HMAC-style signing (for MVP)

    def sign(self, message: str) -> str:
        return hmac.new(self.key.encode("utf-8"), message.encode("utf-8"), hashlib.sha256).hexdigest()

    def verify(self, message: str, signature: str) -> bool:
        expected = self.sign(message)
        return hmac.compare_digest(expected, signature)


@dataclass
class GovernanceLogEntry:
    action: str
    did: str
    details: Dict[str, Any]
    signature: str
    timestamp: float

    def to_dict(self) -> Dict[str, Any]:
        return {
            "action": self.action,
            "did": self.did,
            "details": self.details,
            "signature": self.signature,
            "timestamp": self.timestamp,
        }