greater_wms/bin/views.py

from rest_framework import viewsets
from utils.page import MyPageNumberPagination
from utils.datasolve import sumOfList, transportation_calculate
from utils.md5 import Md5
from rest_framework.filters import OrderingFilter
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework.response import Response
from rest_framework.exceptions import APIException
from django.utils import timezone

from django.db import transaction
import logging
from rest_framework import status
from .models import DeviceModel,LocationModel,LocationGroupModel,LocationContainerLink,LocationChangeLog,alloction_pre,base_location
from bound.models import BoundBatchModel,BoundDetailModel,BoundListModel


from .filter import DeviceFilter,LocationFilter,LocationContainerLinkFilter,LocationChangeLogFilter,LocationGroupFilter
from .serializers import LocationListSerializer,LocationPostSerializer
from .serializers import LocationGroupListSerializer,LocationGroupPostSerializer
# 以后添加模块时，只需要在这里添加即可
from rest_framework.permissions import AllowAny
from container.models import ContainerListModel,ContainerDetailModel,ContainerOperationModel,TaskModel
from django.db.models import Prefetch
import copy
import json
from collections import defaultdict
logger = logging.getLogger(__name__)

# 库位分配
# 入库规则函数
# 逻辑根据批次下的托盘数目来找满足区间范围的库位，按照优先级排序，
     

class locationViewSet(viewsets.ModelViewSet):
    """
        retrieve:
            Response a data list（get）
            list:
            Response a data list（all）
        create:
            Create a data line（post）

        delete:
            Delete a data line（delete)

    """
    # authentication_classes = []  # 禁用所有认证类
    # permission_classes = [AllowAny]  # 允许任意访问
    
    pagination_class = MyPageNumberPagination   
    filter_backends = [DjangoFilterBackend, OrderingFilter, ]
    ordering_fields = ['id', "create_time", "update_time", ]
    filter_class = LocationFilter

    def get_project(self):
        try:
            id = self.kwargs.get('pk')
            return id
        except:
            return None
    def get_queryset(self):
        id = self.get_project()
        prefetch_containers = Prefetch(
        'container_links', 
        queryset=LocationContainerLink.objects.filter(
            is_active=True
        ).select_related('container'),  # 加载关联的托盘对象
        to_attr='active_links'  # 新的属性名称
        )

        if self.request.user:
            if id is None:
                return LocationModel.objects.prefetch_related(prefetch_containers).all()
            else:
                return LocationModel.objects.prefetch_related(prefetch_containers).filter(id=id)
        else:
            return LocationModel.objects.none()

    def get_serializer_class(self):
        if self.action == 'list':
            return LocationListSerializer
        elif self.action == 'update':
            return LocationPostSerializer
        elif self.action =='retrieve':
            return LocationListSerializer

    def update(self, request, *args, **kwargs):
        qs = self.get_object()
        data = self.request.data

        location_code = data.get('location_code')
        # 处理库位对象
        location_obj = LocationModel.objects.filter(location_code=location_code).first()
        if not location_obj:
            logger.info(f"库位 {location_code} 不存在")
            return Response(
                {'code': '400', 'message': '库位不存在', 'data': None},
                status=status.HTTP_400_BAD_REQUEST
            )
        else:
            data['id'] = location_obj.id
            logger.info(f"库位 {location_code} 已存在")
            serializer = self.get_serializer(qs, data=data)
            serializer.is_valid(raise_exception=True)
            serializer.save()
            headers = self.get_success_headers(serializer.data)
            self.handle_group_location_status(location_code,location_obj.location_group)
            return Response(serializer.data, status=200, headers=headers)

    def handle_group_location_status(self,location_code,location_group):
        """
        处理库位组和库位的关联关系
        :param location_code: 库位编码
        :param location_group: 库位组编码
        :return:
        """
        # 1. 获取库位空闲状态的库位数目
        location_obj_number = LocationModel.objects.filter(
            location_group=location_group,
            status='available'
        ).all().count()
        # 2. 获取库位组对象
        logger.info(f"库位组 {location_group} 下的库位数目：{location_obj_number}")
        # 1. 获取库位和库位组的关联关系
        location_group_obj = LocationGroupModel.objects.filter(
            group_code=location_group
        ).first()
        if not location_group_obj:
            logger.info(f"库位组 {location_group} 不存在")
            return None
        else:
            if location_obj_number == 0:
                # 库位组库位已满，更新库位组状态为full
                location_group_obj.status = 'full'
                location_group_obj.save()
            elif location_obj_number < location_group_obj.max_capacity:
                location_group_obj.status = 'occupied'
                location_group_obj.save()
            else:
                location_group_obj.status = 'available'
                location_group_obj.save()

    def batch_status_location(self, request):
        """
        优化版：批量获取库位批次状态
        基于模型结构优化查询
        """
        layer = request.data.get('layer')
        
        # 使用反向关系名 'container_links' 进行预取
        locations = LocationModel.objects.filter(
            layer=layer
        ).prefetch_related(
            Prefetch(
                'container_links',  # 使用模型定义的 related_name
                queryset=LocationContainerLink.objects.filter(is_active=True)
                                                        .select_related('container'),
                to_attr='active_links'
            )
        )
        
        # 收集所有激活链接的容器ID
        container_ids = set()
        for loc in locations:
            if loc.active_links:  # 每个库位最多只有一个激活链接
                container_ids.add(loc.active_links[0].container_id)
        
        # 批量查询容器详情及其批次状态
        container_batch_status = defaultdict(dict)  # 改为字典存储，避免重复记录
        if container_ids:
            container_details = ContainerDetailModel.objects.filter(
                container_id__in=container_ids
            ).select_related('batch').exclude(status=3)  # 排除已删除或不合格的托盘
            
            for detail in container_details:
                if detail.batch_id:
                    # 创建唯一标识的键
                    status_key = (
                        detail.batch.check_status if detail.batch else "404",
                        detail.batch.bound_number if detail.batch else "no_batch"
                    )
                    
                    # 如果这个状态尚未添加过，或者需要更新
                    if status_key not in container_batch_status[detail.container_id]:
                        container_batch_status[detail.container_id][status_key] = (
                            detail.batch.check_status if detail.batch else "404",
                            detail.batch.check_time if detail.batch else "no_check_time",
                            detail.batch.bound_number if detail.batch else "no_batch"
                        )
        
        # 构造返回数据
        return_data = []
        for loc in locations:
            batch_statuses = []
            
            if loc.active_links:
                container_id = loc.active_links[0].container_id
                # 从字典中提取值并转换为列表
                if container_id in container_batch_status:
                    batch_statuses = list(container_batch_status[container_id].values())
            else:
                batch_statuses = [("404", "no_check_time", "no_batch")]
            
            # 使用Django模型自带的model_to_dict转换基础字段
            from django.forms.models import model_to_dict
            location_data = model_to_dict(loc, fields=[
                "id", "shelf_type", "row", "col", "layer", "update_time", 
                "empty_label", "location_code", "location_group", "location_type", 
                "status", "max_capacity", "current_quantity", "c_number", 
                "coordinate", "access_priority", "is_active"
            ])
            
            # 添加批次状态字段 - 存储所有信息
            location_data["batch_statuses"] = batch_statuses
            
            return_data.append(location_data)
            data = {
                "code": "200",
                "msg": "Success Create",
                "data": return_data
            }
        
        return Response(data, status=200)
        

class locationGroupViewSet(viewsets.ModelViewSet):
    """
        retrieve:
            Response a data list（get）
            list:
            Response a data list（all）
        create:
            Create a data line（post）

        delete:
            Delete a data line（delete)

    """
    # authentication_classes = []  # 禁用所有认证类
    # permission_classes = [AllowAny]  # 允许任意访问
    
    pagination_class = MyPageNumberPagination   
    filter_backends = [DjangoFilterBackend, OrderingFilter, ]
    ordering_fields = ['id', "create_time", "update_time", ]
    filter_class = LocationGroupFilter

    def get_project(self):
        try:
            id = self.kwargs.get('pk')
            return id
        except:
            return None

                           
    def get_queryset(self):             
        id = self.get_project()
        if self.request.user:
            if id is None:
                return LocationGroupModel.objects.filter()  
            else:
                return LocationGroupModel.objects.filter(id=id)            
        else:
            return LocationGroupModel.objects.none()                           
    def get_serializer_class(self):                                             
        if self.action == 'list':
            return LocationGroupListSerializer          

        elif self.action == 'update':
            return LocationGroupPostSerializer

        elif self.action =='retrieve':
            return LocationGroupListSerializer      
    
    def update(self, request, *args, **kwargs):
        data = self.request.data
        order_month = str(timezone.now().strftime('%Y%m'))
        data['month'] = order_month
        group_code = data.get('group_code')
        # 处理库位组对象
        group_obj = LocationGroupModel.objects.filter(group_code=group_code).first()
        if group_obj:
            data['id'] = group_obj.id
            logger.info(f"库位组 {group_code} 已存在")
        else:
            logger.info(f"库位组 {group_code} 不存在，创建库位组对象")
            serializer_list = LocationGroupPostSerializer(data=data)
            serializer_list.is_valid(raise_exception=True)
            serializer_list.save()
            data['id'] = serializer_list.data.get('id')
        return Response(data, status=status.HTTP_201_CREATED)

class LocationAllocation:
    # 入库规则函数
    # fun:get_pallet_count_by_batch: 根据托盘码查询批次下托盘总数
    # fun:get_left_locationGroup_number_by_type: 获取每层库位组剩余数量
    # fun:get_location_type: 根据托盘数目获取库位类型
    # fun:update_location_container_link: 更新库位和托盘的关联关系
    # fun:update_location_group_batch: 更新库位组的批次
    # fun:update_batch_status: 更新批次状态yes/no
    # fun:update_location_status: 更新库位状态和
    # fun:up
    # fun:get_batch_status: 获取批次状态
    # fun:get_batch: 获取批次
    # fun:get_location_list_remainder: 获取可用库位的c_number列表
    # fun
    # fun:get_location_by_type_remainder: 根据库位类型获取库位
    # fun:get_location_by_type: 第一次入库，根据库位类型获取库位
    # fun:get_location_by_status: 根据库位状态获取库位

    @transaction.atomic
    def get_pallet_count_by_batch(self, container_code):
        """
        根据托盘码查询批次下托盘总数
        :param container_code: 要查询的托盘码
        :return: 所属批次下的托盘总数
        """
        # 1. 通过托盘码获取托盘详情
        container = ContainerListModel.objects.filter(
            container_code=container_code
        ).first()

        if not container:
            logger.error(f"托盘 {container_code} 不存在")
            return None
        # 2. 获取关联的批次明细
        container_detail = ContainerDetailModel.objects.filter(
            container=container.id,is_delete=False

        ).exclude(status = 3).first()
        if not container_detail:
            logger.error(f"托盘 {container_code} 未组盘")
            return None
 
        batch_container = ContainerDetailModel.objects.filter(
             batch = container_detail.batch.id,
             is_delete = False,
             status = 1
        ).all()
        # 统计批次下的不同托盘 item.contianer_id
        batch_container_count = 0
        container_ids = []
        for item in batch_container:
            if item.container_id not in container_ids: 
                batch_container_count = batch_container_count + 1
                container_ids.append(item.container_id)
        batch_item = BoundBatchModel.objects.filter(  bound_number = container_detail.batch.bound_number).first()
        if not batch_item:
            print(f"批次号获取失败！")
            return None
        batch_item.container_number = batch_container_count
        batch_item.save()
        return batch_container_count
    
    def get_left_locationGroup_number_by_type(self):
        """
        获取每层库位组剩余数量
        :return:
        """
        try:
            # 定义库位组和层号
            group = ['T1', 'T2', 'S4', 'T4', 'T5']
            layer = [1, 2, 3]
            # 初始化结果列表，包含三个空字典对应三个层
            left_number = [{} for _ in layer]
            
            for item in group:
                for idx, layer_num in enumerate(layer):
                    # 检查库位组是否存在（不考虑状态）
                    exists = LocationGroupModel.objects.filter(
                        group_type=item,
                        layer=layer_num
                    ).exists()
                    
                    if not exists:
                        print(f"库位组 {item}_{layer_num} 不存在")
                        left_number[idx][item] = 0
                    else:
                        # 统计可用状态的库位组数量
                        count = LocationGroupModel.objects.filter(
                            group_type=item,
                            layer=layer_num,
                            status='available'
                        ).count()
                        left_number[idx][item] = count
                        
            return left_number
        except Exception as e:
            logger.error(f"获取库位组剩余数量失败：{str(e)}")
            print(f"获取库位组剩余数量失败：{str(e)}")
            return None

    @transaction.atomic
    def update_location_container_link(self,location_code,container_code):
        """
        更新库位和托盘的关联关系
        :param location_code: 库位编码
        :param container_code: 托盘编码
        :return:
        """
        try:
            # 1. 获取库位和托盘的关联关系
            location = LocationModel.objects.filter(
                location_code=location_code
            ).first()
            container = ContainerListModel.objects.filter(
                container_code=container_code
            ).first()
            # 2. 如果库位和托盘的关联关系不存在，创建新的关联关系
            if not LocationContainerLink.objects.filter(location=location).exists():
                location_container_link = LocationContainerLink(
                    location=location,
                    container=container
                )
                location_container_link.save()
                print(f"更新库位和托盘的关联关系成功！")
                return True
            # 3. 更新库位和托盘的关联关系
            else:
                LocationContainerLink.objects.filter(location=location).update(location=location, container=container)
                print(f"更新库位和托盘的关联关系成功！")
                return True
        except Exception as e:       
            logger.error(f"更新库位和托盘的关联关系失败：{str(e)}")
            print(f"更新库位和托盘的关联关系失败：{str(e)}")
            return False 
    def update_container_detail_status(self,container_code,status):
        try:
            # 1. 获取托盘
            container = ContainerListModel.objects.filter(
                container_code=container_code
            ).first()
            if not container:
                print(f"托盘 {container_code} 不存在")
                return False
            # 2. 更新托盘状态
            container_detail = ContainerDetailModel.objects.filter(
                container=container.id,is_delete=False
            ).exclude(status=3).first()
            if not container_detail:
                print(f"托盘 {container_code} 未组盘_from update_container_detail_status")
                return False
            container_detail.status = status
            container_detail.save()
            print(f"更新托盘状态成功！")
            return True
        except Exception as e:       
            logger.error(f"更新托盘状态失败：{str(e)}")
            print(f"更新托盘状态失败：{str(e)}")
            return False 

    def update_location_group_batch(self,location,container_code):
        """
        :param location: 库位对象
        :param container_code: 托盘码

        :return:
        """
        try:
            # 1. 获取库位组
            location_group = LocationGroupModel.objects.filter(
                group_code=location.location_group
            ).first()
            if not location_group:
                print(f"库位组获取失败！")
                return False
            # 2. 更新库位组的批次
            bound_number=self.get_batch(container_code)
            if not bound_number:
                print(f"批次号获取失败！")
                return False
            location_group.current_batch = bound_number
            location_group.save()
            print(f"更新库位组的批次成功！")
            return True
        except Exception as e:       
            logger.error(f"更新库位组的批次失败：{str(e)}")
            print(f"更新库位组的批次失败：{str(e)}")
            return False    
    def update_location_status(self,location_code,status):
        """
        更新库位状态
        :param location_code: 库位编码
        :param status: 库位状态
        :return:
        """
        try:
            # 1. 获取库位
            location = LocationModel.objects.filter(
                location_code=location_code
            ).first()
            if not location:
                print(f"库位获取失败！")
                return False
            # 2. 更新库位状态
            location.status = status
            location.save()
            print(f"更新库位状态成功！")
            return True
        except Exception as e:       
            logger.error(f"更新库位状态失败：{str(e)}")
            print(f"更新库位状态失败：{str(e)}")
            return False    
    
    def update_group_status_reserved(self,location_group_list):
        """
        更新库位组状态
        :param location_group_list: 库位组对象列表
        :return:
        """
        try:
            for location_group in location_group_list:
                # 1. 获取库位组
                if not location_group:
                    print(f"库位组获取失败！")
                    return False
                # 2. 更新库位组状态
                location_group_id = location_group.split('_')[1]
                location_group_item = LocationGroupModel.objects.filter(
                    id=location_group_id
                ).first()
                if not location_group_item:
                    print(f"库位组 {location_group} 不存在")
                    return False
                # 3. 更新库位组状态
                location_group_item.status = 'reserved'
                location_group_item.save()

            return True
        except Exception as e:       
            logger.error(f"更新库位组状态失败：{str(e)}")
            print(f"更新库位组状态失败：{str(e)}")
            return False    
    @transaction.atomic
    def update_location_group_status(self, location_code):
        """
        更新库位组状态
        :param location_code: 库位编码
        :return:
        """
        try:
            # 1. 获取库位
            location = LocationModel.objects.filter(
                location_code=location_code
            ).first()
            if not location:
                print(f"库位获取失败！")
                return False
            
            # 2. 获取库位组
            location_group = LocationGroupModel.objects.filter(
                group_code=location.location_group
            ).first()
            if not location_group:
                print(f"库位组获取失败！")
                return False
            current=0
            for location_item in location_group.location_items.all():
                if location_item.status != 'available':
                    current=current + 1
            # 3. 更新库位组状态
            if current == 0:
                location_group.status = 'available'
            elif current == location_group.max_capacity:
                location_group.status = 'full'
            else:
                location_group.status = 'occupied'
            
            location_group.current_goods_quantity = sum(
                    [loc.current_quantity for loc in location_group.location_items.all()]
                )
            location_group.current_quantity = current
                
            location_group.save()
            print(f"更新库位组状态成功！")
            return True
        except Exception as e:       
            logger.error(f"更新库位组状态失败：{str(e)}")
            print(f"更新库位组状态失败：{str(e)}")
    def update_batch_status(self,container_code,status):
        """
        更新批次状态
        :param batch_id: 批次id
        :param status: 批次状态
        :return:
        """
        try:
            # 1. 通过托盘码获取托盘详情
            container = ContainerListModel.objects.filter(
                container_code=container_code
            ).first()

            if not container:
                logger.error(f"托盘 {container_code} 不存在")
                print(f"托盘 {container_code} 不存在")
                return None
            # 2. 获取关联的批次明细
            container_detail = ContainerDetailModel.objects.filter(
                container=container.id,is_delete=False
            ).exclude(status=3).first()
            if not container_detail:
                print (f"托盘 {container_code} 未组盘")
                logger.error(f"托盘 {container_code} 未组盘_from update_batch_status")
                return None
        
            # 3. 更新批次状态
            batch = container_detail.batch
            batch.status = status
            batch.save()

            print(f"更新批次状态成功！")
            return True
        except Exception as e:       
            logger.error(f"更新批次状态失败：{str(e)}")
            print(f"更新批次状态失败：{str(e)}")
            return False  
        
    # def update_batch_goods_in_location_qty(self,container_code,taskworking):
    #     """
    #     更新批次库位入库数量
    #     :param container_code: 托盘码
    #     :param goods_in_location_qty: 库位入库数量
    #     :return:
    #     """
    #     try:
    #         # 1. 通过托盘码获取托盘详情
    #         container = ContainerListModel.objects.filter(
    #             container_code=container_code
    #         ).first()

    #         if not container:
    #             logger.error(f"托盘 {container_code} 不存在")
    #             print(f"托盘 {container_code} 不存在")
    #             return None
    #         # 2. 获取关联的批次明细
    #         container_detail = ContainerDetailModel.objects.filter(
    #             container=container.id,is_delete=False
    #         ).exclude(status=3).all()
    #         if not container_detail:
    #             print (f"托盘 {container_code} 未组盘")
    #             logger.error(f"托盘 {container_code} 未组盘_from update_batch_goods_in_location_qty")
    #             return None
    #         for item in container_detail:
    #             if item.goods_class == 2:
    #                 continue
    #             item.batch.goods_in_location_qty += item.goods_qty * taskworking
    #             item.batch.save()
    #             print(f"更新批次库位入库数量成功！")
    #         return True
    #     except Exception as e:       
    #         logger.error(f"更新批次库位入库数量失败：{str(e)}")
    #         print(f"更新批次库位入库数量失败：{str(e)}")
    #         return False  


    
    def get_batch_status(self,container_code):
        """
        获取批次状态
        :param container_code: 托盘码
        :return: 批次状态
        """
        # 1. 通过托盘码获取托盘详情
        container = ContainerListModel.objects.filter(
            container_code=container_code
        ).first()

        if not container:
            logger.error(f"托盘 {container_code} 不存在")
            print(f"托盘 {container_code} 不存在")
            return None
        # 2. 获取关联的批次明细
        container_detail = ContainerDetailModel.objects.filter(
            container=container.id,is_delete=False
        ).exclude(status=3).first()
        if not container_detail:
            print (f"托盘 {container_code} 未组盘")
            logger.error(f"托盘 {container_code} 未组盘_from get_batch_status")
            return None

        batch_status = container_detail.batch.status
        return batch_status
    def get_batch(self,container_code):
        """
        获取批次
        :param container_code: 托盘码
        :return: 批次
        """
        # 1. 通过托盘码获取托盘详情
        container = ContainerListModel.objects.filter(
            container_code=container_code
        ).first()

        if not container:
            logger.error(f"托盘 {container_code} 不存在")
            print(f"托盘 {container_code} 不存在")
            return None
        # 2. 获取关联的批次明细
        container_detail = ContainerDetailModel.objects.filter(
            container=container.id,is_delete=False
        ).exclude(status=3).first()
        if not container_detail:
            print (f"托盘 {container_code} 未组盘")
            logger.error(f"托盘 {container_code} 未组盘_from get_batch")
            return None

        batch = container_detail.batch.bound_number
        return batch
    @transaction.atomic
    def get_location_list_remainder(self, location_group_list,container_code):
        """
        获取可用库位的c_number列表
        :param location_list: 库位对象列表
        :return: 可用库位编号列表
        """
        if not location_group_list:
            return None
        min_c_number=1000
        min_c_number_index=1000
         
        current_task = self.get_current_finish_task(container_code)
        print(f"[1]当前已完成任务: {current_task}")
        # 按压力排序
        sorted_pressure = sorted(
            [(0, current_task[0]), (1, current_task[1]), (2, current_task[2])],
            key=lambda x: (-x[1], x[0])
        )
        # 交换第一和第二个元素的位置
        sorted_pressure[0], sorted_pressure[1] = sorted_pressure[1], sorted_pressure[0]
        print(f"[2]任务排序: {sorted_pressure}")
        print(f"[3]当前选择:{sorted_pressure[0][0]+1}")
        location_type_dict = json.loads(self.divide_solution_by_layer(location_group_list))
        # print(f"库位类型分配方案: {location_type_dict}")
   
        for layer, _ in sorted_pressure:
            if not location_type_dict.get(str(layer+1)):
                continue
            # print(f"当前层: {layer+1}")
            # print(f"当前层库位组: {location_type_dict[str(layer+1)].keys()}")
            for group_id in location_type_dict[str(layer+1)].keys():
                location_group = LocationGroupModel.objects.filter(
                    id=group_id,
                ).first()
                if not location_group:
                    continue
                location_list = location_group.location_items.filter(
                    status='available'
                ).all().order_by('c_number')
                if not location_list:
                    print(f"当前层库位组 {location_group.group_code} 可用库位: None")
                    continue
               # 提取所有库位的 c_number
                c_numbers = [loc.c_number for loc in location_list]
                print(f"当前层库位组 {location_group.group_code} 可用库位: {c_numbers}")
                # 更新任务完成数目
                current_task[layer] = current_task[layer] + 1
                self.update_current_finish_task(container_code,current_task)
                return location_list[0]
    @transaction.atomic
    def get_location_type(self, container_code):
        """
        智能库位分配核心算法
        :param container_code: 托盘码
        :return: 库位类型分配方案
        """
        try:
            batch = self.get_batch(container_code)
            if not batch:
                logger.error("批次信息获取失败")
                return None

            # 检查已有分配方案
            existing_solution = alloction_pre.objects.filter(batch_number=batch).first()
            if existing_solution:
                return existing_solution.layer_pre_type

            # 获取关键参数
            total_pallets = self.get_pallet_count_by_batch(container_code)
            layer_capacity = self.get_left_locationGroup_number_by_type()
            current_pressure = self.get_current_pressure()

            # 测试参数
            # total_pallets = 30
            # layer_capacity = [{'T1': 29, 'T2': 14, 'S4': 10, 'T4': 27, 'T5': 27}, {'T1': 0, 'T2': 0, 'S4': 0, 'T4': 0, 'T5': 21}, {'T1': 29, 'T2': 14, 'S4': 10, 'T4': 27, 'T5': 27}]
            # current_pressure = [1,0,0]
            print(f"[1]托盘数目: {total_pallets}")
            print(f"[2]层容量: {layer_capacity}")
            # print(f"[3]当前压力: {current_pressure}")

            # 定义库位容量表
            LOCATION_CAPACITY = {'T1':1, 'T2':2, 'T4':4, 'S4':4, 'T5':5}
            
            def allocate(remain, path, pressure,real_pressure,layer_capacity_state, depth=0):
                # 终止条件
                if remain <= 0:
                    return [path,real_pressure]
                # 深拷贝当前层容量状态
                new_layer_capacity = copy.deepcopy(layer_capacity_state)
                # print(f"[2]当前剩余: {new_layer_capacity}")
                # 压力平衡系数
                balance_factor = 1.0 - (0.1 * min(depth, 5))
                # 层选择策略
                print (f"[3]当前压力: {pressure}")
                layer_priority = sorted(
                    [(0, pressure[0]), (1, pressure[1]), (2, pressure[2])],
                    key=lambda x: (x[1] * balance_factor, x[0])
                )

                for layer, _ in layer_priority:
                    # 生成候选库位类型（按效率和容量排序）
                    # 排序键函数 ：
                    # min(x[1], remain) 计算当前库位类型的容量 c 和剩余数量 remain 中的较小值。
                    # -min(x[1], remain) 和 -x[1] 都使用了负号，这意味着排序是按降序进行的。
                    # 首先按 -min(x[1], remain) 排序，即优先选择容量与剩余数量更接近的库位类型。
                    # 如果有多个库位类型的容量与剩余数量相同，则按 -x[1] 排序，即优先选择容量更大的库位类型。
                    print(f"[4]当前层: {layer+1}, 剩余: {remain}, 容量状态: {new_layer_capacity[layer]}")
                    candidates = sorted(
                        [(t, c) for t, c in LOCATION_CAPACITY.items() 
                         if new_layer_capacity[layer].get(t,0) > 0],
                        key=lambda x: (abs(x[1]-remain), -x[1])
                    )

                    print(f"[4]候选库位类型: {candidates}")
                    for loc_type, cap in candidates:
                        # 更新容量状态
                        updated_capacity = copy.deepcopy(new_layer_capacity)
                        updated_capacity[layer][loc_type] -= 1  # 占用一个库位组
                        # 允许适度空间浪费（当剩余<2时）
                        # effective_cap = min(cap, remain) if (cap - remain) < 2 else cap
                        effective_cap = min(cap, remain) 
                        
                        if effective_cap <= remain:
                            new_remain = remain - effective_cap
                            new_pressure = pressure.copy()
                            for i in range(0, 3):
                                new_pressure[i] -=1 if new_pressure[i] > 0 else 0
                            new_pressure[layer] += effective_cap  # 按实际存放数计算压力,此时别的楼层压力可能降下来了
                            real_pressure[layer] += effective_cap  # 实际压力
                            result = allocate(
                                new_remain, 
                                path + [f"{layer+1}_{loc_type}"],
                                new_pressure,
                                real_pressure,
                                updated_capacity,
                                depth + 1
                            )
                            if result:
                                print (f"[5]分配方案: {result}")
                                return result

                return None

            # 执行分配
            allocation = allocate(total_pallets, [], [current_pressure[0], current_pressure[1],current_pressure[2]],[current_pressure[0], current_pressure[1],current_pressure[2]], layer_capacity)
            
            if not allocation:
                logger.error("无法生成有效分配方案")
                return None

            # 保存分配方案
            allocation_json = self.divide_solution_by_layer(allocation[0])
            print(f"[6]分配方案: {allocation_json}")
            solution = alloction_pre(
                batch_number=batch,
                layer_pre_type =allocation_json
            )
            solution_pressure, created = base_location.objects.get_or_create(
                id=1,
                defaults={
                    'layer1_pressure': 0,
                    'layer2_pressure': 0, 
                    'layer3_pressure': 0
                }
            )
            solution_pressure.layer1_pressure = allocation[1][0]
            solution_pressure.layer2_pressure = allocation[1][1]
            solution_pressure.layer3_pressure = allocation[1][2]

            solution.save()
            solution_pressure.save()


            return [loc.split('_')[1] for loc in allocation[0]]

        except Exception as e:
            logger.error(f"分配算法异常：{str(e)}")
            return None


    def divide_solution_by_layer(self, data):

        # 统计所有存在的层级
        layer_counts = defaultdict(lambda: defaultdict(int))
        existing_layers = set()
        
        for item in data:
            # 分割层级和类型
            try:
                layer, loc_type = item.split('_')
                layer_num = int(layer)
                existing_layers.add(layer_num)
                layer_counts[layer_num][loc_type] += 1
            except (ValueError, IndexError):
                continue  # 跳过无效格式的数据

        # 确定最大层级（至少包含1层）
        max_layer = max(existing_layers) if existing_layers else 1

        # 构建包含所有层级的最终结果
        final_result = {}
        for layer in range(1, max_layer + 1):
            final_result[str(layer)] = dict(layer_counts.get(layer, {}))
        
        return json.dumps(final_result, indent=2)

    def get_current_pressure(self):
        """获取实时工作压力"""
        last_solution = base_location.objects.order_by('-id').first()
        if not last_solution:
            base_location.objects.create(
                layer1_pressure=0,
                layer2_pressure=0,
                layer3_pressure=0,
            ).save()
        return [
            last_solution.layer1_pressure if last_solution else 0,
            last_solution.layer2_pressure if last_solution else 0,
            last_solution.layer3_pressure if last_solution else 0,
        ]
    def get_current_finish_task(self,container):
        batch = self.get_batch(container) 

        if not batch:
            return None
        solution = alloction_pre.objects.filter(batch_number=batch).first()
        if not solution:
            return None

        return [solution.layer1_task_finish_number,solution.layer2_task_finish_number,solution.layer3_task_finish_number]
    def update_current_finish_task(self,container,task_finish_number):
        batch = self.get_batch(container) 

        if not batch:
            return None
        solution = alloction_pre.objects.filter(batch_number=batch).first()
        if not solution:
            return None
        solution.layer1_task_finish_number = task_finish_number[0]
        solution.layer2_task_finish_number = task_finish_number[1]
        solution.layer3_task_finish_number = task_finish_number[2]
        solution.save()
        return True

    @transaction.atomic
    def get_location_by_type(self, location_type_list, start_location, container_code):
        """
        根据库位类型获取库位,先根据工作压力找出最空闲的层，看下这层有没有工作，如果有，就从里面找，如果没有，则跳过该层，继续找下一层
        :param location_type_list: 库位分配方案
        {
            "1": {
                "S4": 1
            },
            "2": {},
            "3": {
                "T5": 1
            }
        }
        :param start_location: 起始位置（决定优先级排序方式）
        :return: 符合条件的库位列表
        """
        locations = []
        # 检查已有分配方案
        existing_solution = alloction_pre.objects.filter(batch_number=self.get_batch(container_code)).first()
        if existing_solution.layer_solution_type:
            print(f"[0]已有库位分配方案：{existing_solution.layer_solution_type}")
            return existing_solution.layer_solution_type

        for layer, location_type_dict in location_type_list.items():

            if not location_type_dict:
                continue
            # 获取库位类型列表
            location_type = list(location_type_dict.keys())
            demand_number = sum(location_type_dict.values())
            print (f"[1]层{layer} 需求数量: {demand_number}, 库位: {location_type}")                    
            location_groups = LocationGroupModel.objects.filter(
                group_type__in=location_type,
                layer=layer,
                status='available'
            )
            if not location_groups:
                print(f"层{layer} 无库位")
            # 根据起始位置选择排序字段
            if start_location == '203':
                ordered_groups = location_groups.order_by('left_priority')
            elif start_location == '103':
                ordered_groups = location_groups.order_by('right_priority')
            else:
                ordered_groups = location_groups.none()

            number = 0
            for location_group in ordered_groups:
                if number >= demand_number:
                    break
                locations.append(f"{layer}_{location_group.id}")
                number += 1
        
        existing_solution.layer_solution_type = locations
        existing_solution.save()
        print(f"[2]分配方案: {locations}")
        return locations if locations else None


    @transaction.atomic
    def get_location_by_status(self,container_code,start_location):
        """
        根据库位状态获取库位
        :param location_type: 库位类型
        :param start_location: 起始库位 if in1 优先考虑left_priority, if in2 优先考虑right_priority 就是获取库位组列表之后进行排序
        :return: 库位列表
        """
        # 1. 获取批次状态 1 为已组盘 2 为部分入库 3 为全部入库
        status = self.get_batch_status(container_code)
        # 
        if status == 1:
            # 2. 获取库位组
            print(f"[1]第一次入库")

            # 重新获取最新数据
            self.get_location_type(container_code) 
            
            location_type_list = json.loads(alloction_pre.objects.filter(batch_number=self.get_batch(container_code)).first().layer_pre_type)            
            location_list = self.get_location_by_type(location_type_list,start_location,container_code)
            # 预定这些库组
            self.update_group_status_reserved(location_list)
            location_min_value = self.get_location_list_remainder(location_list,container_code)
            print(f"库位安排到第{location_min_value.c_number}个库位：{location_min_value}")
            # if not location_list[location_min_index]:
            #     # 库位已满，返回None
            #     return None
            # else:
                
            #     return location_list[location_min_index]
            return location_min_value
      
        elif status == 2:
            # 3. 获取部分入库库位
            print (f"部分入库")
            location_list = alloction_pre.objects.filter(batch_number=self.get_batch(container_code)).first().layer_solution_type
            location_min_value = self.get_location_list_remainder(location_list,container_code)
            print(f"库位安排到第{location_min_value.c_number}个库位：{location_min_value}")
            return location_min_value





    def release_location(self, location_code):
            """释放库位并更新关联数据"""
            try:
                location = LocationModel.objects.get(location_code=location_code)
                links = LocationContainerLink.objects.get(location=location, is_active=True)
                print(f"释放库位: {location_code}, 关联托盘: {links.container_id}")
                # 解除关联并标记为非活跃
                links.is_active = False
                links.save()
                return True
            except Exception as e:
                logger.error(f"释放库位失败: {str(e)}")
                return False