from django.shortcuts import render
from rest_framework.mixins import ListModelMixin, DestroyModelMixin
from rest_framework.exceptions import ParseError, PermissionDenied
from rest_framework.decorators import action
from django.db import transaction
from rest_framework import serializers
from django.utils import timezone
from rest_framework.response import Response

from apps.inm.models import WareHouse, MaterialBatch, MIO, MIOItem
from apps.inm.serializers import (MaterialBatchSerializer, WareHourseSerializer, MIOSerializer, MIOItemSerializer)
from apps.utils.viewsets import CustomGenericViewSet, CustomModelViewSet
from apps.inm.services import InmService
from apps.utils.mixins import BulkCreateModelMixin, BulkDestroyModelMixin


# Create your views here.
class WarehouseVIewSet(CustomModelViewSet):
    """
    list: 仓库信息

    仓库信息
    """
    queryset = WareHouse.objects.all()
    serializer_class = WareHourseSerializer
    search_fields = ['name', 'number', 'place']
    ordering = ['create_time']

    def perform_destroy(self, instance):
        if MaterialBatch.objects.filter(warehouse=instance).exclude(count=0).exists():
            raise ParseError('该仓库存在物料')
        instance.delete()


class MaterialBatchViewSet(ListModelMixin, CustomGenericViewSet):
    """
    list: 物料批次

    物料批次
    """
    perms_map = {'get': '*'}
    queryset = MaterialBatch.objects.all()
    serializer_class = MaterialBatchSerializer
    select_related_fields = ['warehouse', 'material']
    filterset_fields = ['warehouse', 'material']


class MIOViewSet(ListModelMixin, DestroyModelMixin, CustomGenericViewSet):
    """
    list: 出入库记录

    出入库记录
    """
    perms_map = {'get': '*', 'delete': 'mio.delete'}
    queryset = MIO.objects.all()
    select_related_fields = ['create_by']
    serializer_class = MIOSerializer

    def perform_destroy(self, instance):
        if instance.state != MIO.MIO_CREATE:
            raise ParseError('非创建中不可删除')
        return super().perform_destroy(instance)
    
    @action(methods=['post'], detail=True, perms_map={'post': 'mio.update'}, serializer_class=serializers.Serializer)
    @transaction.atomic
    def submit(self, request, *args, **kwargs):
        """提交

        提交
        """
        ins = self.get_object()
        user = request.user
        if ins.create_by != user:
            raise PermissionDenied('非创建人不可提交')
        if ins.state != MIO.MIO_CREATE:
            raise ParseError('订单非创建中')
        ins.submit_time = timezone.now()
        ins.state = MIO.MIO_SUBMITED
        ins.save()
        InmService.update_inm(ins)
        return Response()

class MIOItemViewSet(ListModelMixin, BulkCreateModelMixin, BulkDestroyModelMixin, CustomGenericViewSet):
    """
    list: 出入库明细

    出入库明细
    """
    queryset = MIOItem.objects.all()
    serializer_class = MIOItemSerializer
    select_related_fields = ['warehouse', 'mio', 'material']
    filterset_fields = ['warehouse', 'mio', 'material']
    ordering = ['create_time']
    
    def perform_destroy(self, instance):
        if instance.state != MIO.MIO_CREATE:
            raise ParseError('出入库记录非创建中不可删除')
        return super().perform_destroy(instance)