import json
import aiofiles
from pathlib import Path
from typing import Optional

CONFIG_PATH = Path("config.json")


async def load_config() -> dict:
    if not CONFIG_PATH.exists():
        return {}
    async with aiofiles.open(CONFIG_PATH, "r") as f:
        data = await f.read()
        return json.loads(data)


async def save_config(config: dict) -> None:
    async with aiofiles.open(CONFIG_PATH, "w") as f:
        await f.write(json.dumps(config, indent=2))


async def get_output_channel(guild_id: int) -> Optional[int]:
    config = await load_config()
    return config.get(str(guild_id), {}).get("output_channel_id")


async def set_output_channel(guild_id: int, channel_id: int) -> None:
    config = await load_config()
    guild_key = str(guild_id)
    guild_config = config.get(guild_key, {})
    guild_config["output_channel_id"] = channel_id
    config[guild_key] = guild_config
    await save_config(config)