from rest_framework import exceptions, serializers
from rest_framework.mixins import CreateModelMixin, DestroyModelMixin, ListModelMixin, RetrieveModelMixin
from apps.sam.serializers import ContractCreateUpdateSerializer, ContractSerializer, CustomerCreateUpdateSerializer, CustomerSerializer, OrderCreateUpdateSerializer, OrderSerializer, SaleCreateSerializer, SaleListSerializer, SaleProductCreateSerializer, SaleProductListSerializer, SaleProductMtestSerializer
from apps.sam.models import Contract, Customer, Order, Sale, SaleProduct
from rest_framework.viewsets import GenericViewSet, ModelViewSet
from apps.system.mixins import CreateUpdateCustomMixin
from django.shortcuts import render
from rest_framework.decorators import action
from django.db.models import F
from rest_framework.response import Response
# Create your views here.
class CustomerViewSet(CreateUpdateCustomMixin, ModelViewSet):
    """
    客户-增删改查
    """
    perms_map = {'*': '*'}
    queryset = Customer.objects.all()
    serializer_class = CustomerSerializer
    search_fields = ['name', 'contact']
    filterset_fields = []
    ordering_fields = ['create_time']
    ordering = ['-create_time']

    def get_serializer_class(self):
        if self.action in ['create', 'update']:
            return CustomerCreateUpdateSerializer
        return CustomerSerializer


class ContractViewSet(CreateUpdateCustomMixin, ModelViewSet):
    """
    合同-增删改查
    """
    perms_map = {'*': '*'}
    queryset = Contract.objects.select_related('customer').all()
    serializer_class = ContractSerializer
    search_fields = ['name']
    filterset_fields = []
    ordering_fields = ['create_time']
    ordering = ['-create_time']

    def get_serializer_class(self):
        if self.action in ['create', 'update']:
            return ContractCreateUpdateSerializer
        return ContractSerializer

class OrderViewSet(CreateUpdateCustomMixin, ModelViewSet):
    """
    订单-增删改查
    """
    perms_map = {'*': '*'}
    queryset = Order.objects.select_related('contract', 'customer').all()
    serializer_class = OrderSerializer
    search_fields = ['number', 'product']
    filterset_fields = ['product', 'contract', 'customer']
    ordering_fields = ['create_time']
    ordering = ['-create_time']

    def get_serializer_class(self):
        if self.action in ['create', 'update']:
            return OrderCreateUpdateSerializer
        return super().get_serializer_class()

    @action(methods=['get'], detail=False, perms_map={'get':'*'})
    def toplan(self, request, pk=None):
        queryset = Order.objects.filter(count__gt=F('planed_count')).order_by('-id')
        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)
        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)


class SaleViewSet(CreateUpdateCustomMixin, ListModelMixin, RetrieveModelMixin, CreateModelMixin, GenericViewSet):
    """
    销售记录
    """
    perms_map = {'*': '*'}
    queryset = Sale.objects.select_related('customer', 'order', 'product', 'order__contract').all()
    serializer_class = SaleListSerializer
    search_fields = ['customer__name', 'order__number']
    filterset_fields = ['product', 'order', 'customer']
    ordering_fields = ['create_time']
    ordering = ['-create_time']

    def get_serializer_class(self):
        if self.action == 'create':
            return SaleCreateSerializer
        elif self.action == 'retrieve':
            return SaleListSerializer
        return super().get_serializer_class()
    
    @action(methods=['post'], detail=True, perms_map={'post':'*'}, serializer_class=serializers.Serializer)
    def audit(self, request, pk=None):
        """
        审核
        """
        obj = self.get_object()
        if obj.is_audited:
            raise exceptions.APIException('已审核通过')
        # 创建出库记录
        # 更新库存
        return Response()

class SaleProductViewSet(ListModelMixin, DestroyModelMixin, CreateModelMixin, GenericViewSet):
    """
    销售记录关联产品
    """
    perms_map = {'*': '*'}
    queryset = SaleProduct.objects.select_related('iproduct', 'iproduct__material', 'iproduct__warehouse').all()
    serializer_class = SaleProductListSerializer
    search_fields = []
    filterset_fields = ['sale', 'iproduct']
    ordering_fields = ['create_time']
    ordering = ['id']

    def get_serializer_class(self):
        if self.action == 'create':
            return SaleProductCreateSerializer
        return super().get_serializer_class()

    def destroy(self, request, *args, **kwargs):
        obj = self.get_object()
        obj.sale.count = SaleProduct.objects.filter(sale=obj.sale).count()
        obj.sale.save()
        obj.delete()
        return Response()
    
    @action(methods=['post'], detail=True, perms_map={'post':'*'}, serializer_class=SaleProductMtestSerializer)
    def mtest(self, request, pk=None):
        """
        军检
        """
        obj = self.get_object()
        if obj.is_mtested:
            raise exceptions.APIException('已进行军检')
        obj.remark = request.data.get('remark', None)
        obj.is_mtestok = request.data.get('is_mtestok')
        obj.save()
        return Response()