import uuid
from datetime import timedelta

from django.conf import settings
from drf_spectacular.utils import extend_schema
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView

from apps.core.serializers import MediaPresignInputSerializer, MediaPresignOutputSerializer
from apps.gooyal_oauth2.rest_framework import IsAuthenticatedOrTokenMatchesOASRequirements
from utils.clients.minio_client import minio_client
from utils.exceptions import ServiceUnavailable


class MediaPresignView(APIView):
    """Presigned MinIO upload URL for product/store images (icon, logo, cover, ...).

    The client uploads the file bytes directly to MinIO with the returned
    upload_url, then submits the returned object_key as the field value when
    creating/updating the owning resource (e.g. Store.logo, Product.image).
    """

    schema_tags = ['Media']
    permission_classes = [IsAuthenticatedOrTokenMatchesOASRequirements]
    required_alternate_scopes = {
        "POST": [[]],
    }

    @extend_schema(request=MediaPresignInputSerializer, responses={201: MediaPresignOutputSerializer})
    def post(self, request):
        serializer = MediaPresignInputSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)

        filename = serializer.validated_data['filename']
        extension = filename.rsplit('.', 1)[-1] if '.' in filename else 'bin'
        object_key = f'uploads/{uuid.uuid4()}.{extension}'

        try:
            upload_url = minio_client.presigned_put_object(
                settings.MINIO_MEDIA_FILES_BUCKET,
                object_key,
                expires=timedelta(minutes=30),
            )
        except Exception:
            raise ServiceUnavailable('خطا در دریافت لینک آپلود. لطفاً دوباره تلاش کنید.')

        return Response(
            MediaPresignOutputSerializer({'upload_url': upload_url, 'object_key': object_key}).data,
            status=status.HTTP_201_CREATED,
        )