from functools import lru_cache
from os import getenv
from pathlib import Path

from dotenv import load_dotenv


PROJECT_ROOT = Path(__file__).resolve().parents[2]
load_dotenv(PROJECT_ROOT / ".env")


def _env_bool(name: str, default: bool) -> bool:
    value = getenv(name)
    if value is None:
        return default
    return value.strip().lower() in {"1", "true", "yes", "on"}


class Settings:
    def __init__(self) -> None:
        self.session_secret_key = getenv(
            "SESSION_SECRET_KEY", "change-me-in-production"
        )
        self.azure_tenant_id = getenv("AZURE_TENANT_ID")
        self.azure_client_id = getenv("AZURE_CLIENT_ID")
        self.azure_client_secret = getenv("AZURE_CLIENT_SECRET")
        self.azure_oauth_verify_ssl = _env_bool("AZURE_OAUTH_VERIFY_SSL", True)
        self.azure_oauth_ca_bundle = getenv("AZURE_OAUTH_CA_BUNDLE")

    @property
    def azure_configured(self) -> bool:
        return bool(
            self.azure_tenant_id and self.azure_client_id and self.azure_client_secret
        )


@lru_cache
def get_settings() -> Settings:
    return Settings()