from datetime import datetime, timedelta

import os
from django.http import HttpResponse
from django.urls import path
from drf_yasg.utils import swagger_auto_schema
from rest_framework import status
from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response

from core.settings import MEDIA_ROOT
from files.models import File


@swagger_auto_schema(method='GET', auto_schema=None)
@api_view(['GET'])
@permission_classes([IsAuthenticated])
def media_urls(request, hash):
    try:
        if request.META.get('HTTP_IF_NONE_MATCH') and request.META.get('HTTP_IF_NONE_MATCH') == hash:
            return HttpResponse(status=status.HTTP_304_NOT_MODIFIED)

        file = File.objects.get(hash=hash)
        hash_path = file.file
        return HttpResponse(status=status.HTTP_200_OK,
                            content_type=file.mime_type,
                            headers={
                                'X-Accel-Redirect': f'/redirect_media/{hash_path}',
                                'Access-Control-Allow-Origin': '*',
                                'Cache-Control': 'max-age=31536000, private',
                                'Expires': datetime.utcnow() + timedelta(days=365),
                                'Age': 0,
                                'ETag': file.hash,
                            })

    except File.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)


@swagger_auto_schema(method='GET', auto_schema=None)
@api_view(['GET'])
@permission_classes([IsAuthenticated])
def thumbnail_urls(request, size, hash):
    if size not in [32, 64, 256]:
        return Response(status=status.HTTP_404_NOT_FOUND)
    if request.META.get('HTTP_IF_NONE_MATCH') and request.META.get('HTTP_IF_NONE_MATCH') == hash + "_" + str(size):
        return HttpResponse(status=status.HTTP_304_NOT_MODIFIED)
    try:
        file = File.objects.get(hash=hash)
        hash_path = file.file
        if not os.path.exists(MEDIA_ROOT + f'/thumbnails/{size}/{hash_path}'):
            from PIL import Image
            image = Image.open(file.file)
            image.thumbnail((size, size))
            rgb_image = image.convert('RGB')
            thumb_dir = os.path.dirname(MEDIA_ROOT + f'/thumbnails/{size}/{hash_path}')
            if not os.path.exists(thumb_dir):
                os.makedirs(thumb_dir)
            rgb_image.save(MEDIA_ROOT + f'/thumbnails/{size}/{hash_path}', 'jpeg', quality=90)

        return HttpResponse(status=status.HTTP_200_OK,
                            content_type="image/jpeg",
                            headers={
                                'X-Accel-Redirect': f'/redirect_thumbnail/{size}/{hash_path}',
                                'Access-Control-Allow-Origin': '*',
                                'Cache-Control': 'max-age=31536000, private',
                                'Expires': datetime.utcnow() + timedelta(days=365),
                                'Age': 0,
                                'ETag': file.hash + "_" + str(size),
                            })

    except File.DoesNotExist:
        return Response(status=status.HTTP_404_NOT_FOUND)


urlpatterns = [
    path('<int:size>/<path:hash>/', thumbnail_urls),
    path('<path:hash>/', media_urls),
]