from dataclasses import dataclass
import os


@dataclass(frozen=True)
class Config:
    bot_token: str
    admin_telegram_ids: set[int]
    admin_departments: dict[int, set[str]]
    database_path: str
    sla_minutes: int


def parse_admin_departments(raw: str) -> dict[int, set[str]]:
    result: dict[int, set[str]] = {}
    for rule in raw.split(";"):
        if ":" not in rule:
            continue
        admin_id_raw, departments_raw = rule.split(":", 1)
        admin_id_raw = admin_id_raw.strip()
        if not admin_id_raw.isdigit():
            continue

        departments = {
            department.strip()
            for department in departments_raw.split(",")
            if department.strip()
        }
        if departments:
            result[int(admin_id_raw)] = departments
    return result


def load_config() -> Config:
    token = os.getenv("BOT_TOKEN", "").strip()
    if not token:
        raise RuntimeError("BOT_TOKEN is not set")

    admin_ids_raw = os.getenv("ADMIN_TELEGRAM_IDS", "")
    admin_ids = {
        int(item.strip())
        for item in admin_ids_raw.split(",")
        if item.strip().isdigit()
    }
    admin_departments = parse_admin_departments(os.getenv("ADMIN_DEPARTMENTS", ""))
    # Если для админа не задан явный список разделов — он видит ВСЕ разделы.
    for admin_id in admin_ids:
        admin_departments.setdefault(admin_id, set())

    return Config(
        bot_token=token,
        admin_telegram_ids=admin_ids,
        admin_departments=admin_departments,
        database_path=os.getenv("DATABASE_PATH", "/app/data/tickets.db"),
        sla_minutes=int(os.getenv("SLA_MINUTES", "60")),
    )