from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    app_name: str = "Subfeed"

    database_url: str = "postgresql+psycopg://subfeed:subfeed@db:5432/subfeed"

    # Session cookie signing key.
    secret_key: str = "change-me-session-key"
    # Fernet key (urlsafe base64, 32 bytes) for encrypting stored refresh tokens.
    token_encryption_key: str = ""

    google_client_id: str = ""
    google_client_secret: str = ""
    oauth_redirect_url: str = "http://localhost:8080/auth/callback"

    # Comma-separated invite list / admin list of Google account emails.
    allowed_emails: str = ""
    admin_emails: str = ""

    # Origin of a separately served frontend dev server (enables CORS). Empty in production.
    frontend_origin: str = ""

    # --- Sync / YouTube Data API ---
    # Optional API key for public reads (channels/videos/playlistItems). When set it is
    # preferred for shared backfill/enrichment so it doesn't depend on a specific user.
    youtube_api_key: str = ""
    # Daily quota budget (units). Default leaves headroom under the 10,000/day free limit.
    quota_daily_budget: int = 9000
    # Recent-first backfill: how far back to fetch on the first pass per channel.
    backfill_recent_max_videos: int = 100
    backfill_recent_max_days: int = 365

    # Shorts are confirmed by probing youtube.com/shorts/<id>. Only videos at or below
    # this duration (and not livestreams) are probed; longer videos are never Shorts.
    shorts_probe_max_seconds: int = 180
    shorts_probe_batch: int = 150
    shorts_probe_interval_minutes: int = 2
    # videos.list accepts up to 50 ids per call.
    enrich_batch_size: int = 50

    # --- Background scheduler ---
    scheduler_enabled: bool = True
    rss_poll_minutes: int = 20
    enrich_interval_minutes: int = 3
    backfill_interval_minutes: int = 10
    # Keep this many quota units in reserve so scheduled backfill never starves
    # interactive syncs / enrichment of fresh videos.
    backfill_quota_reserve: int = 2000

    # --- Auto-tagging / feed defaults ---
    # Number of recent video titles sampled per channel for language detection.
    autotag_title_sample: int = 40
    autotag_interval_minutes: int = 30
    # live_status values hidden from the feed by default. Completed-stream VODs
    # ("was_live") are real watchable content and stay visible.
    feed_default_hidden_live: str = "live,upcoming"

    @property
    def allowed_email_set(self) -> set[str]:
        return {e.strip().lower() for e in self.allowed_emails.split(",") if e.strip()}

    @property
    def admin_email_set(self) -> set[str]:
        return {e.strip().lower() for e in self.admin_emails.split(",") if e.strip()}


settings = Settings()