from dataclasses import dataclass
import os

@dataclass(frozen=True)
class Settings:
    github_token: str = ""
    sharepoint_site_url: str = "https://sharepoint.invalid"
    allowed_repositories: tuple[str, ...] = ()
    require_approval: bool = True
    environment: str = "development"

    @classmethod
    def from_env(cls) -> "Settings":
        repos = tuple(x.strip() for x in os.getenv("ALLOWED_REPOSITORIES", "").split(",") if x.strip())
        return cls(os.getenv("GITHUB_TOKEN", ""), os.getenv("SHAREPOINT_SITE_URL", cls.sharepoint_site_url), repos, os.getenv("REQUIRE_APPROVAL", "true").lower() != "false", os.getenv("ENVIRONMENT", "development"))