from __future__ import annotations

import json
import time
from dataclasses import dataclass
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
PAIR_PATH = ROOT / "data" / "phone_pairing.json"


@dataclass(frozen=True, slots=True)
class PairStatus:
    paired: bool
    device_name: str
    paired_at: float


def mark_paired(device_name: str = "android") -> None:
    PAIR_PATH.parent.mkdir(parents=True, exist_ok=True)
    payload = {"paired": True, "device_name": str(device_name or "android"), "paired_at": float(time.time())}
    try:
        PAIR_PATH.write_text(json.dumps(payload, indent=2), encoding="utf-8")
    except Exception:
        pass


def read_pair_status() -> PairStatus:
    try:
        if not PAIR_PATH.exists():
            return PairStatus(False, "", 0.0)
        data = json.loads(PAIR_PATH.read_text(encoding="utf-8"))
        if not isinstance(data, dict):
            return PairStatus(False, "", 0.0)
        return PairStatus(bool(data.get("paired")), str(data.get("device_name") or ""), float(data.get("paired_at") or 0.0))
    except Exception:
        return PairStatus(False, "", 0.0)