import logging
import csv

from django.shortcuts import render
from django.conf import settings

# Create your views here.
from rest_framework import viewsets
from rest_framework.permissions import IsAuthenticatedOrReadOnly, IsAdminUser
from rest_framework.decorators import api_view, permission_classes

import requests

from products.models import Product
from products.serializers import ProductSerializer

from back_latienda.permissions import IsCreator


logging.basicConfig(
    filename='logs/product-load.log',
    filemode='w',
    format='%(levelname)s:%(message)s',
    level=logging.INFO,
    )


class ProductViewSet(viewsets.ModelViewSet):
      queryset = Product.objects.all()
      serializer_class = ProductSerializer
      permission_classes = [IsAuthenticatedOrReadOnly, IsCreator]


@api_view(['POST',])
@permission_classes([IsAdminUser,])
def load_coop_products(request):
      """Read CSV file being received
      Parse it to create products for related Company
      """
      try:
            csv_file = request.FILES['csv_file']
            if csv_file.name.endswith('.csv') is not True:
                  logging.error(f"File {csv_file.name} is not a CSV file")
                  return Response({"errors":{"details": "File is not CSV type"}})

            logging.info(f"Reading contents of  {csv_file.name}")
            decoded_file = csv_file.read().decode('utf-8').splitlines()
            csv_reader =  csv.DictReader(decoded_file, delimiter=',')
            counter = 0
            for row in csv_reader:
                  if '' in (row['nombre-producto'], row['descripcion'], row['precio']):
                        logging.error(f"Required data missing: {row}")
                        continue
                  try:
                        # download image references in csv
                        image_url = row['image'].strip()
                        response = requests.get(image_url, stream=True)
                        if response.status_code == 200:
                              path = f"{setting.BASE_DIR}media/{row['nombre-producto'].strip()}.{image.url.split('/')[-1]}"
                              logging.info(f"Saving product image to: {path}")
                              new_image = open(path, 'wb')
                              for chunk in response:
                                    new_image.write(chunk)
                              new_image.close()
                        else:
                              logging.warninig(f"Image URL did not work: {image_url}")
                              new_image = None
                        # assemble instance data
                        product_data = {
                              'id': None if row['id'].strip()=='' else row['id'].strip(),
                              'name': row['nombre-coop'].strip(),
                              'short_name': row['nombre-producto'].strip(),
                              'description': row['descripcion'].strip(),
                              'image': new_image,
                              'url': row['url'].strip(),
                              'precio': row['precio'].strip(),
                              'shipping_cost': row['gastos-envio'].strip(),
                              'shipping_terms': row['cond-envio'].strip(),
                              'discount': row['descuento'].strip(),
                              'stock': row['stock'].strip(),
                              'tags': row['tags'].strip(),
                              'category': row['categoria'].strip(),
                              'identifiers': row['identificadores'].strip(),
                        }
                        Product.objects.create(**product_data)
                        logging.info(f"Created Product: {product_data}")
                        counter += 1
                  except Exception as e:
                        logging.error(f"Could not parse {row}")
            return Response()
      except Exception as e:
            return Response({"errors": {"details": str(type(e))}})