from pathlib import Path

from pydantic_settings import BaseSettings, SettingsConfigDict


BASE_DIR = Path(__file__).resolve().parent.parent
DATA_DIR = BASE_DIR / "data"
DATA_DIR.mkdir(exist_ok=True)


def _resolve_sqlite_url(url: str) -> str:
    """SQLAlchemy SQLite URL with a relative path is interpreted against CWD,
    which breaks when the app is started from any directory other than the
    project root. Anchor relative SQLite paths to BASE_DIR."""
    prefix = "sqlite:///"
    if not url.startswith(prefix):
        return url
    path_part = url[len(prefix):]
    p = Path(path_part)
    if p.is_absolute():
        return url
    resolved = (BASE_DIR / p).resolve()
    resolved.parent.mkdir(parents=True, exist_ok=True)
    return f"{prefix}{resolved}"


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=BASE_DIR / ".env",
        env_file_encoding="utf-8",
        extra="ignore",
    )

    tg_bot_token: str = ""
    web_host: str = "127.0.0.1"
    web_port: int = 8000
    public_base_path: str = ""
    scrape_interval_hours: int = 4
    database_url: str = f"sqlite:///{DATA_DIR / 'monitor.db'}"
    admin_chat_id: str = ""
    # Shared PIN that unlocks destructive web actions (delete/edit). Empty = gate
    # disabled (everything allowed). See app/auth.py.
    admin_pin: str = ""

    def model_post_init(self, __context) -> None:
        self.database_url = _resolve_sqlite_url(self.database_url)


settings = Settings()