import os
from functools import lru_cache
from typing import List


class Settings:
    """Application settings loaded from environment."""

    def __init__(self) -> None:
        self.allowed_users: List[str] = self._parse_list(os.getenv("SKD_ALLOWED_USERS", ""))
        self.auth_secret: str = os.getenv("SKD_AUTH_SECRET", "change-me-secret")
        self.token_ttl_seconds: int = int(os.getenv("SKD_TOKEN_TTL_SECONDS", "900"))
        self.auth_allowed_users: List[str] = self._parse_list(os.getenv("SKD_AUTH_ALLOWED_USERS", ""))
        self.auth_allowed_groups: List[str] = self._parse_list(
            os.getenv("SKD_AUTH_ALLOWED_GROUPS", "sudo")
        )
        self.auth_pam_service: str = os.getenv("SKD_AUTH_PAM_SERVICE", "login")
        self.default_countdown: int = int(os.getenv("SKD_DEFAULT_COUNTDOWN", "60"))
        self.default_sound: bool = os.getenv("SKD_DEFAULT_SOUND", "false").lower() == "true"
        self.notify_timeout: int = int(os.getenv("SKD_NOTIFY_TIMEOUT", "5"))
        self.dry_run: bool = os.getenv("SKD_DRY_RUN", "false").lower() == "true"
        # Paths/tools
        self.notify_send_path: str = os.getenv("SKD_NOTIFY_SEND_PATH", "notify-send")
        self.sound_player: str = os.getenv("SKD_SOUND_PLAYER", "paplay")
        self.sound_file: str = os.getenv(
            "SKD_SOUND_FILE",
            "/usr/share/sounds/freedesktop/stereo/dialog-warning.oga",
        )

    @staticmethod
    def _parse_list(value: str) -> List[str]:
        return [item for item in (part.strip() for part in value.split(",")) if item]


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()