from __future__ import annotations

import json
import time
from typing import Any


class LedgerSigner:
    def __init__(self, key: str):
        self.key = key

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

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


def sign_and_append(plan_delta: Any, signer: LedgerSigner, log_path: str = "ledger.log") -> bool:
    # Convert plan_delta to a portable dict if possible
    if hasattr(plan_delta, "to_dict"):
        payload = plan_delta.to_dict()
    elif isinstance(plan_delta, dict):
        payload = plan_delta
    else:
        payload = {"repr": repr(plan_delta)}

    payload_str = json.dumps(payload, sort_keys=True)
    signature = signer.sign(payload_str)
    entry = {"timestamp": time.time(), "payload": payload, "signature": signature}
    with open(log_path, "a", encoding="utf-8") as f:
        f.write(json.dumps(entry) + "\n")
    return True