import csv
import logging
import json
import io
import datetime

from django.shortcuts import render
from django.http import HttpResponse
from django.contrib.auth import get_user_model
from django.core import serializers

from rest_framework import status
from rest_framework import viewsets
from rest_framework.response import Response
from rest_framework.permissions import IsAdminUser, IsAuthenticated
from rest_framework.generics import UpdateAPIView
from rest_framework.decorators import api_view, permission_classes

from companies.models import Company

from . import models
from . import serializers as core_serializers

from back_latienda.permissions import CustomUserPermissions, YourOwnUserPermissions


User = get_user_model()

# Create your views here.

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


class CustomUserViewSet(viewsets.ModelViewSet):

    model = models.CustomUser
    # serializer_class = core_serializers.CustomUserSerializer
    serializer_class = core_serializers.CustomUserReadSerializer
    write_serializer_class = core_serializers.CustomUserWriteSerializer
    model_name = 'custom_user'
    queryset = models.CustomUser.objects.all()
    permission_classes = [CustomUserPermissions,]

    def create(self, request):
        """
        Create Instance
        """
        try:
            serializer = self.write_serializer_class(
                data=request.data,
            )
            if serializer.is_valid():
                # save model instance data
                password = serializer.validated_data.pop('password')
                instance = self.model(**serializer.validated_data)
                instance.set_password(password)
                instance.save()

                return Response(self.serializer_class(
                    instance, many=False, context={'request': request}).data,
                                status=status.HTTP_201_CREATED)
            else:
                return Response(
                    serializer.errors, status=status.HTTP_406_NOT_ACCEPTABLE)
        except Exception as e:
            return Response(str(e), status=status.HTTP_500_INTERNAL_SERVER_ERROR)


class ChangeUserPasswordView(UpdateAPIView):

    model = models.CustomUser
    queryset = model.objects.all()
    permission_classes = (YourOwnUserPermissions,)
    serializer_class = core_serializers.ChangePasswordSerializer


class UpdateUserView(UpdateAPIView):

    model = models.CustomUser
    queryset = model.objects.all()
    permission_classes = (YourOwnUserPermissions,)
    serializer_class = core_serializers.UpdateUserSerializer


@api_view(['GET',])
@permission_classes([IsAuthenticated,])
def my_user(request):
      qs = User.objects.filter(email=request.user.email)
      data = serializers.serialize('json', qs)
      return Response(data=data)

@api_view(['POST',])
@permission_classes([IsAdminUser,])
def load_coop_managers(request):
    """Read CSV file being received
    Parse it to create users and related companies
    """
    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=',')
        coop_counter = 0
        user_counter = 0
        for row in csv_reader:
            if '' in (row['cif'], row['nombre-coop'], row['email']):
                logging.error(f"Required data missing: {row}")
                continue
            try:
                coop_data = {
                    'cif': row['cif'].strip(),
                    'company_name': row['nombre-coop'].strip(),
                    'short_name': row['nombre-corto'].strip(),
                    'shop': bool(row['es-tienda'].strip()),
                    'shop_link': row['url'].strip(),
                }
                coop = Company.objects.create(**coop_data)
                logging.info(f"Created Coop: {coop_data}")
                coop_counter += 1

                coop_user = User.objects.create_user(email=row['email'], company=coop, role='COOP_MANAGER')
                logging.info(f"Created User: {coop_user}")
                # TODO: send confirmation email
                user_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))}})