from __future__ import annotations

import json
import os
from pathlib import Path
from typing import Any

from utils.logger import get_logger

logger = get_logger(__name__)

DATA_DIR = Path(__file__).resolve().parent.parent / "data"
CONFIG_FILE = DATA_DIR / "config.json"

DEFAULT_CONFIG: dict[str, Any] = {
    "selected_game_id": None,
    "theme": "dark",
    "sidebar_collapsed": False,
    "telemetry_port": 20777,
    "telemetry_host": "0.0.0.0",
    "server_host": "0.0.0.0",
    "server_port": 9527,
    "forward_targets": [],
}


def load_config() -> dict[str, Any]:
    if CONFIG_FILE.exists():
        try:
            with open(CONFIG_FILE, "r", encoding="utf-8") as f:
                cfg = json.load(f)
            merged = {**DEFAULT_CONFIG, **cfg}
            logger.info("Config loaded from %s", CONFIG_FILE)
            return merged
        except Exception as e:
            logger.error("Failed to load config: %s", e)
    logger.info("No config file found, using defaults")
    return DEFAULT_CONFIG.copy()


def save_config(cfg: dict[str, Any]) -> None:
    DATA_DIR.mkdir(parents=True, exist_ok=True)
    try:
        with open(CONFIG_FILE, "w", encoding="utf-8") as f:
            json.dump(cfg, f, indent=2, ensure_ascii=False)
        logger.info("Config saved to %s", CONFIG_FILE)
    except Exception as e:
        logger.error("Failed to save config: %s", e)


_config_cache: dict[str, Any] | None = None


def get_config() -> dict[str, Any]:
    global _config_cache
    if _config_cache is None:
        _config_cache = load_config()
    return _config_cache


def update_config(key: str, value: Any) -> None:
    cfg = get_config()
    cfg[key] = value
    save_config(cfg)


def reload_config() -> None:
    global _config_cache
    _config_cache = None