import platform
import time

from django.conf import settings
from rest_framework.permissions import AllowAny
from rest_framework.response import Response
from rest_framework.views import APIView


def _os_info():
    system = platform.system()
    icon = {"Linux": "linux", "Darwin": "apple", "Windows": "windows"}.get(
        system, "unknown"
    )
    return {"name": system, "release": platform.release(), "icon": icon}


def _worker_counts():
    """Active/queued background jobs.

    No task pipeline exists yet, so this reports honest zeros for now.
    """
    return {"active": 0, "queued": 0}


class StatusView(APIView):
    """Runtime status used by the SPA shell (storage line, status pill, footer)."""

    permission_classes = [AllowAny]

    def get(self, request):
        started = getattr(request, "start_time", time.perf_counter())
        payload = {
            "app": "J621",
            "env": settings.APP_ENV,
            "git_hash": settings.GIT_COMMIT_HASH,
            "version": settings.APP_VERSION,
            "os": _os_info(),
            "watched_folder": settings.WATCHED_FOLDER,
            "e621_time_ms": None,  # no e621 calls in the backend yet
            "workers": _worker_counts(),
        }
        payload["server_time_ms"] = round((time.perf_counter() - started) * 1000, 1)
        return Response(payload)