import os


class Settings:
    @staticmethod
    def get_public_url() -> str:
        url = os.getenv("SPACE_PUBLIC_URL", "")
        if not url:
            url = os.getenv("SPACE_HOST", "")
            if url:
                url = f"https://{url}"
        if not url:
            # Local development fallback
            port = os.getenv("PORT", "7860")
            url = f"http://127.0.0.1:{port}"
        return url

    @staticmethod
    def get_session_ttl_seconds() -> int:
        return int(os.getenv("SESSION_TTL_SECONDS", "3600"))

    @staticmethod
    def get_job_ttl_seconds() -> int:
        return int(os.getenv("JOB_TTL_SECONDS", "300"))

    @staticmethod
    def get_max_payload_bytes() -> int:
        return int(os.getenv("MAX_PAYLOAD_BYTES", "10485760"))

    @staticmethod
    def is_signature_required() -> bool:
        return os.getenv("REQUIRE_DEVICE_SIGNATURES", "false").lower() == "true"