"""配置加载与保存：config.json 是唯一配置来源。"""

from __future__ import annotations

import json
import threading
from dataclasses import dataclass, asdict
from pathlib import Path

CONFIG_PATH = Path(__file__).resolve().parent.parent / "config.json"

_lock = threading.Lock()


@dataclass
class Config:
    """全局配置（运行时可改的字段会在界面设置页暴露）。"""

    port: int = 8000
    password: str = "admin123"
    global_interval_seconds: int = 300
    retry_count: int = 2
    timeout_seconds: int = 10
    max_workers: int = 8
    telegram_bot_token: str = ""
    telegram_chat_id: str = ""


def load_config() -> Config:
    with _lock:
        if not CONFIG_PATH.exists():
            cfg = Config()
            save_config(cfg)
            return cfg
        raw = json.loads(CONFIG_PATH.read_text(encoding="utf-8"))
        known = {f: getattr(Config, f) for f in Config.__dataclass_fields__}
        data = {k: v for k, v in raw.items() if k in known}
        return Config(**data)


def save_config(cfg: Config) -> None:
    with _lock:
        CONFIG_PATH.write_text(
            json.dumps(asdict(cfg), ensure_ascii=False, indent=2),
            encoding="utf-8",
        )