"""Настройки из переменных окружения (.env)."""
from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

from dotenv import load_dotenv

load_dotenv()

ROOT = Path(__file__).resolve().parent.parent


def _list(name: str) -> list[str]:
    return [x.strip() for x in os.getenv(name, "").split(",") if x.strip()]


def _bool(name: str, default: bool) -> bool:
    v = os.getenv(name)
    if v is None or v == "":
        return default
    return v.strip().lower() in ("1", "true", "yes", "on")


def _quiet(v: str | None) -> tuple[int, int] | None:
    # "23-8" -> (23, 8)
    if not v:
        return None
    try:
        a, b = v.split("-")
        return int(a), int(b)
    except ValueError:
        return None


@dataclass(frozen=True)
class Settings:
    tg_token: str
    owner_id: int
    openrouter_key: str
    model: str
    uni_email: str
    uni_password: str | None
    my_name: str
    mail_url: str
    teams_url: str
    data_dir: Path
    headless: bool
    chromium_path: str | None
    notify_min: int
    quiet_hours: tuple[int, int] | None
    digest_time: str | None
    tz: str
    reload_hours: float
    scan_interval: int
    batch_window: float
    vip: list[str]
    mute: list[str]
    rules_path: Path
    selectors_path: Path

    @property
    def profile_dir(self) -> Path:
        return self.data_dir / "browser-profile"

    @property
    def db_path(self) -> Path:
        return self.data_dir / "uni.db"


def load() -> Settings:
    missing = [n for n in ("TG_TOKEN", "OWNER_ID", "OPENROUTER_API_KEY", "UNI_EMAIL") if not os.getenv(n)]
    if missing:
        raise SystemExit(f"Не заданы переменные окружения: {', '.join(missing)} (см. .env.example)")

    data_dir = Path(os.getenv("DATA_DIR", ROOT / "data"))
    data_dir.mkdir(parents=True, exist_ok=True)

    return Settings(
        tg_token=os.environ["TG_TOKEN"],
        owner_id=int(os.environ["OWNER_ID"]),
        openrouter_key=os.environ["OPENROUTER_API_KEY"],
        model=os.getenv("LLM_MODEL", "~anthropic/claude-haiku-latest"),
        uni_email=os.environ["UNI_EMAIL"],
        uni_password=os.getenv("UNI_PASSWORD") or None,
        my_name=os.getenv("MY_NAME", ""),
        mail_url=os.getenv("MAIL_URL", "https://outlook.office.com/mail/"),
        teams_url=os.getenv("TEAMS_URL", "https://teams.microsoft.com/v2/"),
        data_dir=data_dir,
        headless=_bool("HEADLESS", False),
        chromium_path=os.getenv("CHROMIUM_PATH") or None,
        notify_min=int(os.getenv("NOTIFY_MIN_LEVEL", "2")),
        quiet_hours=_quiet(os.getenv("QUIET_HOURS")),
        digest_time=os.getenv("DIGEST_TIME") or None,
        tz=os.getenv("TZ", "Europe/Warsaw"),
        reload_hours=float(os.getenv("RELOAD_HOURS", "6")),
        scan_interval=int(os.getenv("SCAN_INTERVAL", "120")),
        batch_window=float(os.getenv("BATCH_WINDOW", "4")),
        vip=_list("VIP"),
        mute=_list("MUTE"),
        rules_path=Path(os.getenv("RULES_PATH", ROOT / "config" / "rules.md")),
        selectors_path=Path(os.getenv("SELECTORS_PATH", ROOT / "config" / "selectors.json")),
    )