import os

basedir = os.path.abspath(os.path.dirname(__file__))

def _get_bool(name: str, default: bool) -> bool:
    val = os.environ.get(name)
    if val is None:
        return default
    return str(val).strip().lower() in {"1", "true", "t", "yes", "y", "on"}

def _get_str(name: str, default: str) -> str:
    return os.environ.get(name, default)

class Config:
    """
    Konfiguracja aplikacji pobierana z ENV (z sensownymi domyślnymi wartościami).
    Zmiennych szukamy pod nazwami:
      - DATABASE_URL
      - SECRET_KEY
      - ALLOW_REGISTRATION
      - MAIN_ADMIN_USERNAME
      - MAIN_ADMIN_PASSWORD
      - BLOCK_BOTS
      - CACHE_CONTROL_HEADER
      - PRAGMA_HEADER
      - ROBOTS_TAG
    """


    #SQLALCHEMY_DATABASE_URI = _get_str("DATABASE_URL", "sqlite:///baza.db")

    # Flask
    SECRET_KEY = _get_str("SECRET_KEY", "tajny_klucz")

    # Rejestracja i konto admina
    ALLOW_REGISTRATION = _get_bool("ALLOW_REGISTRATION", False)
    MAIN_ADMIN_USERNAME = _get_str("MAIN_ADMIN_USERNAME", "admin")
    MAIN_ADMIN_PASSWORD = _get_str("MAIN_ADMIN_PASSWORD", "admin")

    # Indeksowanie / cache / robots
    BLOCK_BOTS = _get_bool("BLOCK_BOTS", True)
    CACHE_CONTROL_HEADER = _get_str("CACHE_CONTROL_HEADER", "max-age=600")
    CACHE_CONTROL_HEADER_STATIC = _get_str("CACHE_CONTROL_HEADER_STATIC", "max-age=3600")

    USE_ETAGS = _get_bool("USE_ETAGS", True)

    PRAGMA_HEADER = _get_str("PRAGMA_HEADER", "")
    ROBOTS_TAG = _get_str("ROBOTS_TAG", "noindex, nofollow, nosnippet, noarchive")

    # (opcjonalnie) wyłącz warningi track_modifications
    SQLALCHEMY_TRACK_MODIFICATIONS = False

    HEALTHCHECK_TOKEN = _get_str("HEALTHCHECK_TOKEN", "healthcheck")

    # Baza danych
    DB_ENGINE = os.environ.get("DB_ENGINE", "sqlite").lower()

    if DB_ENGINE == "sqlite":
        SQLALCHEMY_DATABASE_URI = f"sqlite:///{os.path.join(basedir, 'db', 'database.db')}"
    elif DB_ENGINE == "pgsql":
        SQLALCHEMY_DATABASE_URI = (
            f"postgresql://{os.environ['DB_USER']}:{os.environ['DB_PASSWORD']}@"
            f"{os.environ['DB_HOST']}:{os.environ.get('DB_PORT', 5432)}/{os.environ['DB_NAME']}"
        )
    elif DB_ENGINE == "mysql":
        SQLALCHEMY_DATABASE_URI = (
            f"mysql+pymysql://{os.environ['DB_USER']}:{os.environ['DB_PASSWORD']}@"
            f"{os.environ['DB_HOST']}:{os.environ.get('DB_PORT', 3306)}/{os.environ['DB_NAME']}"
        )
    else:
        raise ValueError("Nieobsługiwany typ bazy danych.")