import os
from dataclasses import dataclass, replace


@dataclass(frozen=True)
class Settings:
    app_name: str = os.getenv("APP_NAME", "Microsoft 365 Service")
    app_version: str = os.getenv("APP_VERSION", "1.0.1")
    root_path: str = os.getenv("ROOT_PATH", "")
    tenant_id: str = os.getenv("MS365_TENANT_ID", "")
    client_id: str = os.getenv("MS365_CLIENT_ID", "")
    client_secret: str = os.getenv("MS365_CLIENT_SECRET", "")
    credential_encoding_secret: str = os.getenv("MS365_CREDENTIAL_ENCODING_SECRET", "")
    graph_base_url: str = os.getenv("MS365_GRAPH_BASE_URL", "https://graph.microsoft.com/v1.0")
    graph_scope: str = os.getenv("MS365_GRAPH_SCOPE", "https://graph.microsoft.com/.default")
    request_timeout_seconds: float = float(os.getenv("MS365_REQUEST_TIMEOUT_SECONDS", "30"))

    @property
    def token_url(self) -> str:
        return f"https://login.microsoftonline.com/{self.tenant_id}/oauth2/v2.0/token"

    @property
    def is_configured(self) -> bool:
        return bool(self.tenant_id and self.client_id and self.client_secret)

    def with_credentials(self, tenant_id: str, client_id: str, client_secret: str) -> "Settings":
        return replace(
            self,
            tenant_id=tenant_id,
            client_id=client_id,
            client_secret=client_secret,
        )


settings = Settings()