# coding=utf-8

from django.db import transaction
from django.db.models import F
from django.conf import settings

from rest_framework import generics, mixins
from rest_framework.viewsets import GenericViewSet
from rest_framework.views import APIView
from rest_framework.decorators import action
from rest_framework.exceptions import NotFound

from utils import response_ok
from utils.permission import IsCustomerUser
from utils.exceptions import CustomError

from apps.product.models import Product
from apps.product.filters import ProductFilter
from apps.account import tenant_log
from apps.foundation.models import BizLog, Option
from apps.customer.models import Customer
from apps.foundation.filters import OptionFilter

from .serializers import ProductSerializer, ProductDetailSerializer, ProductTypeSerializer


class ProductListView(generics.ListAPIView):
    queryset = Product.objects.filter(delete=False)
    serializer_class = ProductSerializer

    def filter_queryset(self, queryset):
        f = ProductFilter(self.request.GET, queryset=queryset)
        return f.qs

    def list(self, request, *args, **kwargs):
        try:
            data = super(ProductListView, self).list(request)
        except NotFound:
            return response_ok([])
        return data


class ProductTypeListView(generics.ListAPIView):
    queryset = Option.objects.filter(enable=True, delete=False, type=Option.PRODUCT_CATEGORY)
    serializer_class = ProductTypeSerializer

    def filter_queryset(self, queryset):
        f = OptionFilter(self.request.GET, queryset=queryset)
        return f.qs

    def list(self, request, *args, **kwargs):
        try:
            data = super(ProductTypeListView, self).list(request)
        except NotFound:
            return response_ok([])
        return data


class ProductDetailView(generics.RetrieveAPIView):
    queryset = Product.objects.filter(enabled=True, delete=False)
    serializer_class = ProductDetailSerializer

    def retrieve(self, request, *args, **kwargs):
        id = request.GET.get('id')
        instance = self.queryset.filter(id=id).first()
        if not instance:
            raise CustomError(u'未找到相应的商品！')
        serializer = self.get_serializer(instance)
        return response_ok(serializer.data)