import os
from typing import Optional


class Settings:
    @staticmethod
    def load_settings() -> dict:
        return {
            "space_public_url": os.getenv("SPACE_PUBLIC_URL", ""),
            "session_ttl_seconds": int(os.getenv("SESSION_TTL_SECONDS", "3600")),
            "job_ttl_seconds": int(os.getenv("JOB_TTL_SECONDS", "300")),
            "max_payload_bytes": int(os.getenv("MAX_PAYLOAD_BYTES", "10485760")),
            "max_workers_per_session": int(os.getenv("MAX_WORKERS_PER_SESSION", "5")),
            "require_device_signatures": os.getenv("REQUIRE_DEVICE_SIGNATURES", "false").lower() == "true",
            "receipt_storage_path": os.getenv("RECEIPT_STORAGE_PATH", "./data/receipts.jsonl"),
            "allow_untrusted_browser_worker": os.getenv("ALLOW_UNTRUSTED_BROWSER_WORKER", "true").lower() == "true",
        }

    @staticmethod
    def get_public_url() -> str:
        url = os.getenv("SPACE_PUBLIC_URL", "")
        if not url:
            # Try to infer from HF Space environment
            url = os.getenv("SPACE_HOST", "")
            if url:
                url = f"https://{url}"
        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"