import io

from django.http import FileResponse, JsonResponse
from django.shortcuts import get_object_or_404
from django.views.decorators.http import require_GET

from core.models import StoredFile


def healthz(_request):
    """Liveness probe for deploy / NPM health checks."""
    return JsonResponse({"status": "ok"})


@require_GET
def stored_file(request, pk):
    """Public fetch (UUID acts as capability token)."""
    stored = get_object_or_404(StoredFile, pk=pk)
    response = FileResponse(
        io.BytesIO(bytes(stored.data)),
        content_type=stored.content_type or "application/octet-stream",
    )
    if stored.filename:
        response["Content-Disposition"] = f'inline; filename="{stored.filename}"'
    response["Cache-Control"] = "public, max-age=86400"
    return response