from rest_framework import viewsets, status
from rest_framework.parsers import MultiPartParser, FormParser
from rest_framework.permissions import IsAuthenticated, IsAdminUser
from rest_framework.response import Response
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework.filters import OrderingFilter, SearchFilter
from utils.page import MyPageNumberPagination

from .models import InvoiceHeader, InvoiceRecord
from .serializers import InvoiceHeaderGetSerializer, InvoiceHeaderPostSerializer
from .serializers import InvoiceHeaderPatchSerializer, InvoiceHeaderDeleteSerializer, InvoiceRecordGetSerializer, InvoiceRecordPostSerializer, InvoiceRecordPatchSerializer, InvoiceRecordDeleteSerializer
from .filter import InvoiceHeaderFilter, InvoiceRecordFilter

class InvoiceHeaderViewSet(viewsets.ModelViewSet):
    """
    发票头视图集
        retrieve:
            Response a data list (get)

        list:
            Response a data list (all)

        create:
            Create a data line (post)

        delete:
            Delete a data line (delete)

        partial_update:
            Partial_update a data (patch:partial_update)

        update:
            Update a data (put:update)
    """
    fliter_backends = (DjangoFilterBackend, OrderingFilter)
    ordering_fields = ('create_time', 'update_time')
    filterset_class = InvoiceHeaderFilter
    pagination_class = MyPageNumberPagination
    def get_project(self):
        try:
            id = self.kwargs.get('pk')
            return id
        except:
            return None

    def get_queryset(self):
        project_id = self.get_project()
        if project_id:
            return InvoiceHeader.objects.filter(id=project_id,is_delete=False)
            
        else:
            return InvoiceHeader.objects.filter(is_delete=False)

    def get_serializer_class(self):
        if self.action in ['list','retrieve']:
            return InvoiceHeaderGetSerializer
        elif self.action in ['create', 'update', 'partial_update']:
            return InvoiceHeaderPostSerializer
        else:
            return InvoiceHeaderGetSerializer

    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_200_OK, headers=headers)
            

    def update(self, request, *args, **kwargs):
        qs = self.get_object()
        serializer = self.get_serializer(qs, data=request.data, partial=True)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_200_OK, headers=headers)

    def partial_update(self, request, *args, **kwargs):
        return super().partial_update(request, *args, **kwargs)