// 库存管理服务（Stock公共库存）
// 职责：入库/出库操作，支持明细模式(StockDetails)和批次模式(StockBatch)
// 调用链：Controller → StockOperation → stockPublishMessage → NATS → AddStock(消费者)
// 紧密耦合：dao.StockDetails、dao.StockBatch、dao.AssetSku(更新库存数)、common/message(NATS发布)
// 注意：移库/调拨是PrivateStock专属操作，不在此实现
package service

import (
	"assets/consts/public"
	"assets/consts/stock"
	assetDao "assets/dao/asset"
	dao "assets/dao/stock"
	assetDto "assets/model/dto/asset"
	stockDto "assets/model/dto/stock"
	assetEntity "assets/model/entity/asset"
	entity "assets/model/entity/stock"
	"context"
	"fmt"

	"gitea.com/red-future/common/beans"
	"gitea.com/red-future/common/redis"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
	"github.com/gogf/gf/v2/util/gconv"
	"go.mongodb.org/mongo-driver/v2/bson"
)

type stockManage struct{}

// StockManage 库存管理服务（Stock公共库存）
// 职责：
// 1. 入库/出库：StockDetails（明细模式）和 StockBatch（批次模式）的库存操作
// 2. 库存查询表单字段生成
// 注意：移库（MoveStock）和调拨（TransferStock）是PrivateStock专属操作，不要在这里实现
var StockManage = new(stockManage)

// GetStockFormFields 获取库存操作表单字段
func (s *stockManage) GetStockFormFields(ctx context.Context, req *stockDto.GetStockFormFieldsReq) (*stockDto.GetStockFormFieldsRes, error) {
	// 获取资产SKU信息
	assetSku, err := assetDao.AssetSku.GetOne(ctx, &assetDto.GetAssetSkuReq{Id: req.AssetSkuId})
	if err != nil {
		return nil, err
	}
	fields := make([]map[string]interface{}, 0)
	// Stock 字段在两种模式下都显示
	fields = append(fields, map[string]interface{}{
		"name":     "stock",
		"label":    "库存数量",
		"type":     "number",
		"required": true,
		"min":      1,
	})
	// 如果是批次模式(2)，添加批次相关字段
	if !g.IsEmpty(assetSku.StockMode) && assetSku.StockMode == stock.StockModeBatch {
		fields = append(fields, []map[string]interface{}{
			{
				"name":      "batchNo",
				"label":     "批次号",
				"type":      "number",
				"required":  true,
				"default":   gconv.Int(gtime.Now().Format("20060102") + "0001"),
				"maxLength": 12,
			},
			{
				"name":  "productionDate",
				"label": "生产日期",
				"type":  "date",
			},
			{
				"name":  "expiryDate",
				"label": "过期日期",
				"type":  "date",
			},
			{
				"name":  "expiryWarningDate",
				"label": "临期预警时间",
				"type":  "date",
			},
		}...)
	}
	return &stockDto.GetStockFormFieldsRes{
		StockMode: assetSku.StockMode,
		Fields:    fields,
	}, nil
}

// StockOperation 库存操作入口（入库/出库）
// 根据SKU的StockMode区分明细模式和批次模式，计算差值后发布消息到NATS
func (s *stockManage) StockOperation(ctx context.Context, req *stockDto.StockOperationReq) (err error) {
	assetSku, err := assetDao.AssetSku.GetOne(ctx, &assetDto.GetAssetSkuReq{Id: req.AssetSkuId})
	if err != nil {
		return
	}
	if !assetSku.UnlimitedStock && req.Stock >= 0 {
		var stockId *bson.ObjectID
		count := 0
		if assetSku.StockMode == stock.StockModeDetail {
			_count, err := dao.StockDetails.GetStockCountBySkuId(ctx, assetSku.Id)
			if err != nil {
				return err
			}
			count = gconv.Int(_count)
		}
		if assetSku.StockMode == stock.StockModeBatch {
			if g.IsEmpty(req.BatchNo) {
				return gerror.New("批次号不能为空")
			}
			getOne, err := dao.StockBatch.GetOne(ctx, req.BatchNo)
			if err != nil {
				return err
			}
			if !g.IsEmpty(getOne) {
				stockId = getOne.Id
				count = getOne.BatchQty
			}
		}
		stockCount := 0
		operationType := ""
		if count != req.Stock {
			if count > req.Stock {
				stockCount = count - req.Stock
				operationType = "del"
			} else {
				stockCount = req.Stock - count
				operationType = "add"
			}
		}
		if !g.IsEmpty(operationType) && stockCount > 0 {
			if err = s.stockPublishMessage(ctx, assetSku, stockId, stockCount, operationType, req); err != nil {
				return err
			}
		}
	}
	return
}

// stockPublishMessage 发布库存变更消息到NATS
// 消费者接收后执行实际的入库/出库操作（异步解耦）
func (s *stockManage) stockPublishMessage(ctx context.Context, assetSku *assetEntity.AssetSku, stockId *bson.ObjectID, stockCount int, operationType string, req *stockDto.StockOperationReq) (err error) {
	// 用户信息
	user, err := utils.GetUserInfo(ctx)
	if err != nil {
		return
	}
	publishMessage := stockDto.StockPublishMessage{
		AssetId:           assetSku.AssetId,
		AssetSkuId:        assetSku.Id,
		TenantId:          user.TenantId,
		UserName:          user.UserName,
		StockCount:        stockCount,
		OperationType:     operationType,
		Metadata:          gconv.Maps(assetSku.SpecValues),
		StockMode:         int(assetSku.StockMode),
		BatchNo:           req.BatchNo,
		ProductionDate:    req.ProductionDate,
		ExpiryDate:        req.ExpiryDate,
		ExpiryWarningDate: req.ExpiryWarningDate,
	}
	if !g.IsEmpty(stockId) && !stockId.IsZero() {
		publishMessage.StockId = stockId.Hex()
	}
	// 发布到 NATS
	//plugin, err := message.GetMsgPlugin(ctx, message.MessageNATS)
	//if err != nil {
	//	return gerror.Newf("NATS插件未就绪: %v", err)
	//}
	//err = plugin.Publish(ctx, &message.NatsPublishMsgConfig{
	//	QueueName: public.StockDetailGroupName,
	//	Durable:   true,
	//	Data:      publishMessage,
	//})
	//_, err = message.PublishMessage(ctx, &message.RedisMessageConfig{StreamKey: public.StockDetailStreamKey}, publishMessage)
	//plugin, err := message.GetMsgPlugin(message.MessageRedis)
	//if err != nil {
	//	return err
	//}
	//err = plugin.Publish(ctx, &message.RedisPublishMsgConfig{
	//	QueueName: public.StockDetailQueueName,
	//	Data:      publishMessage,
	//})
	return
}

// AddStock NATS消费者调用，执行实际的入库/出库操作
// 使用Redis分布式锁防止并发冲突，支持明细模式和批次模式
func (s *stockManage) AddStock(ctx context.Context, msg map[string]interface{}) error {
	assetId := gconv.Int64(msg["assetId"])
	assetSkuId := gconv.Int64(msg["assetSkuId"])
	stockId := gconv.Int64(msg["stockId"])
	userName := gconv.String(msg["userName"])
	tenantId := gconv.Float64(msg["tenantId"])
	stockCount := gconv.Int(msg["stockCount"])
	operationType := gconv.String(msg["operationType"])
	metadata := gconv.Maps(msg["metadata"])
	stockMode := stock.StockMode(gconv.Int(msg["stockMode"]))
	batchNo := gconv.String(msg["batchNo"])
	productionDate := gtime.New(msg["productionDate"])
	expiryDate := gtime.New(msg["expiryDate"])
	expiryWarningDate := gtime.New(msg["expiryWarningDate"])
	// 设置 userId 和 tenantId 到 ctx
	ctx = context.WithValue(ctx, "userName", userName)
	ctx = context.WithValue(ctx, "tenantId", tenantId)
	// 获取redis-租户存储-锁key
	fileLockKey := fmt.Sprintf(public.StockDetailLockKey, assetSkuId)
	success, err := redis.Lock(ctx, fileLockKey, int64(60), func(ctx context.Context) error {
		if operationType == "add" {
			if stockMode == stock.StockModeBatch {
				if !g.IsEmpty(stockId) {
					batch := stockDto.UpdateBatchReq{
						Id:           stockId,
						BatchQty:     stockCount,
						AvailableQty: stockCount,
					}
					if err := dao.StockBatch.Update(ctx, &batch); err != nil {
						return err
					}
				} else {
					batch := stockDto.CreateBatchReq{
						AssetId:           assetId,
						AssetSkuId:        assetSkuId,
						Status:            stock.BatchStatusActive,
						Metadata:          metadata,
						BatchNo:           batchNo,
						BatchQty:          stockCount,
						AvailableQty:      stockCount,
						ProductionDate:    productionDate,
						ExpiryDate:        expiryDate,
						ExpiryWarningDate: expiryWarningDate,
					}
					if _, err := dao.StockBatch.Insert(ctx, &batch); err != nil {
						return err
					}
				}
			}
			if stockMode == stock.StockModeDetail {
				// 创建指定数量的库存
				var stockInterfaces []interface{}
				for i := 0; i < stockCount; i++ {
					stockInterfaces = append(stockInterfaces, entity.StockDetails{
						AssetId:    assetId,
						AssetSkuId: assetSkuId,
						Status:     stock.StockStatusAvailable,
						Metadata:   metadata,
					})
				}
				// 批量插入数据库
				if _, err := dao.StockDetails.BatchInsert(ctx, stockInterfaces); err != nil {
					return err
				}
			}
		}
		if operationType == "del" {
			if stockMode == stock.StockModeBatch {
				stockCount = 0 - stockCount
				// 更新批次
				batch := stockDto.UpdateBatchReq{
					Id:           stockId,
					BatchQty:     stockCount,
					AvailableQty: stockCount,
				}
				if err := dao.StockBatch.Update(ctx, &batch); err != nil {
					return err
				}
			}
			if stockMode == stock.StockModeDetail {
				// 分页查询所有库存明细，收集所有ID
				var allStockIds []*bson.ObjectID
				pageSize := int64(50)
				for pageNum := int64(1); ; pageNum++ {
					details, total, err := dao.StockDetails.List(ctx,
						&stockDto.ListStockDetailsReq{
							AssetSkuId: assetSkuId,
							Status:     stock.StockStatusAvailable,
							Page:       &beans.Page{PageNum: pageNum, PageSize: pageSize},
						})
					if err != nil {
						return err
					}
					if pageNum == 1 && int(total) < stockCount {
						return gerror.New("可操作库存数量不足")
					}
					// 收集当前页的ID
					for _, detail := range details {
						if detail.Id != nil && !detail.Id.IsZero() {
							allStockIds = append(allStockIds, detail.Id)
							if len(allStockIds) >= stockCount {
								break
							}
						}
					}
					if len(allStockIds) >= stockCount {
						break
					}
				}
				// 根据ID批量删除库存
				delCount, err := dao.StockDetails.DeleteManyByIds(ctx, allStockIds)
				if err != nil {
					return err
				}
				if delCount != int64(stockCount) {
					return gerror.New("删除库存数量不匹配")
				}
				stockCount = 0 - stockCount
			}
		}
		_, err := assetDao.AssetSku.Update(ctx, &assetDto.UpdateAssetSkuReq{Id: assetSkuId, Stock: stockCount})
		return err
	})
	if err != nil {
		return err
	}
	if !success {
		return fmt.Errorf("获取库存操作锁失败: %v", err)
	}
	return nil
}