from dataclasses import dataclass
from os import getenv
from pathlib import Path
from zoneinfo import ZoneInfo

from dotenv import load_dotenv

load_dotenv()


@dataclass(frozen=True)
class Config:
    bot_token: str
    allowed_user_ids: set[int]
    vault_path: Path
    daily_notes_dir: str
    note_path_format: str
    message_time_format: str
    telegram_proxy: str | None
    reminder_min_seconds: int
    reminder_max_seconds: int
    reminder_start_hour: int
    reminder_end_hour: int
    reminder_timezone: ZoneInfo


def _required(name: str) -> str:
    value = getenv(name)
    if not value:
        raise RuntimeError(f"Не задана переменная окружения {name}")
    return value


def _user_ids(value: str) -> set[int]:
    return {int(user_id.strip()) for user_id in value.split(",") if user_id.strip()}


def _hours_to_seconds(value: str) -> int:
    return int(float(value) * 60 * 60)
    # return int(float(value))


def _hour(name: str, default: str) -> int:
    hour = int(getenv(name, default))
    if not 0 <= hour <= 23:
        raise RuntimeError(f"{name} должен быть числом от 0 до 23")
    return hour


def load_config() -> Config:
    reminder_start_hour = _hour("REMINDER_START_HOUR", "7")
    reminder_end_hour = _hour("REMINDER_END_HOUR", "23")
    if reminder_start_hour >= reminder_end_hour:
        raise RuntimeError("REMINDER_START_HOUR должен быть меньше REMINDER_END_HOUR")

    return Config(
        bot_token=_required("BOT_TOKEN"),
        allowed_user_ids=_user_ids(_required("ALLOWED_USER_IDS")),
        vault_path=Path(_required("OBSIDIAN_VAULT_PATH")).expanduser().resolve(),
        daily_notes_dir=getenv("DAILY_NOTES_DIR", "03 Journal"),
        note_path_format=getenv("NOTE_PATH_FORMAT", "%Y/%m/%d.%m.%y.md"),
        message_time_format=getenv("MESSAGE_TIME_FORMAT", "%H:%M"),
        telegram_proxy=getenv("TELEGRAM_PROXY"),
        reminder_min_seconds=_hours_to_seconds(getenv("REMINDER_MIN_HOURS", "2")),
        reminder_max_seconds=_hours_to_seconds(getenv("REMINDER_MAX_HOURS", "3")),
        reminder_start_hour=reminder_start_hour,
        reminder_end_hour=reminder_end_hour,
        reminder_timezone=ZoneInfo(getenv("REMINDER_TIMEZONE", "Europe/Moscow")),
    )