package dao

import (
	"context"
	"fmt"
	"time"

	"order/consts"
	"order/model/entity"

	"gitea.com/red-future/common/mongo"

	"go.mongodb.org/mongo-driver/v2/bson"
)

// OrderStatisticsBaseDAO 订单统计基础DAO
type OrderStatisticsBaseDAO struct {
}

var OrderStatisticsBaseDAOInstance = &OrderStatisticsBaseDAO{}

// OrderStats 订单统计结果
type OrderStats struct {
	TotalOrders  int64
	TotalAmount  int64
	TotalItems   int64
	UniqueUsers  map[int64]bool
	UniqueAssets map[string]bool
	AssetCounts  map[string]int64
}

// GetOrderStats 获取订单统计信息
func (dao *OrderStatisticsBaseDAO) GetOrderStats(ctx context.Context, tenantID int64, startDate, endDate time.Time) (*OrderStats, error) {
	stats := &OrderStats{
		UniqueUsers:  make(map[int64]bool),
		UniqueAssets: make(map[string]bool),
		AssetCounts:  make(map[string]int64),
	}

	// 查询所有状态的订单数据
	filter := bson.M{
		"tenantId": tenantID,
		"createdAt": bson.M{
			"$gte": startDate,
			"$lt":  endDate,
		},
	}

	// 查询待支付订单
	var pendingOrders []*entity.OrderPending
	err := mongo.DB().Find(ctx, filter, &pendingOrders, consts.OrderPendingCollection)
	if err != nil {
		return nil, fmt.Errorf("查询待支付订单数据失败: %v", err)
	}

	// 查询已支付订单
	var paidOrders []*entity.OrderPaid
	err = mongo.DB().Find(ctx, filter, &paidOrders, consts.OrderPaidCollection)
	if err != nil {
		return nil, fmt.Errorf("查询已支付订单数据失败: %v", err)
	}

	// 查询已发货订单
	var shippedOrders []*entity.OrderShipped
	err = mongo.DB().Find(ctx, filter, &shippedOrders, consts.OrderShippedCollection)
	if err != nil {
		return nil, fmt.Errorf("查询已发货订单数据失败: %v", err)
	}

	// 查询已完成订单
	var completedOrders []*entity.OrderCompleted
	err = mongo.DB().Find(ctx, filter, &completedOrders, consts.OrderCompletedCollection)
	if err != nil {
		return nil, fmt.Errorf("查询已完成订单数据失败: %v", err)
	}

	// 统计待支付订单
	for _, order := range pendingOrders {
		stats.TotalOrders++
		stats.TotalAmount += order.TotalAmount
		stats.UniqueUsers[order.UserID] = true

		if order.OrderItems != nil {
			stats.TotalItems += int64(len(order.OrderItems))
			for _, item := range order.OrderItems {
				stats.UniqueAssets[item.AssetID] = true
				stats.AssetCounts[item.AssetID]++
			}
		}
	}

	// 统计已支付订单
	for _, order := range paidOrders {
		stats.TotalOrders++
		stats.TotalAmount += order.TotalAmount
		stats.UniqueUsers[order.UserID] = true

		if order.OrderItems != nil {
			stats.TotalItems += int64(len(order.OrderItems))
			for _, item := range order.OrderItems {
				stats.UniqueAssets[item.AssetID] = true
				stats.AssetCounts[item.AssetID]++
			}
		}
	}

	// 统计已发货订单
	for _, order := range shippedOrders {
		stats.TotalOrders++
		stats.TotalAmount += order.TotalAmount
		stats.UniqueUsers[order.UserID] = true

		if order.OrderItems != nil {
			stats.TotalItems += int64(len(order.OrderItems))
			for _, item := range order.OrderItems {
				stats.UniqueAssets[item.AssetID] = true
				stats.AssetCounts[item.AssetID]++
			}
		}
	}

	// 统计已完成订单
	for _, order := range completedOrders {
		stats.TotalOrders++
		stats.TotalAmount += order.TotalAmount
		stats.UniqueUsers[order.UserID] = true

		if order.OrderItems != nil {
			stats.TotalItems += int64(len(order.OrderItems))
			for _, item := range order.OrderItems {
				stats.UniqueAssets[item.AssetID] = true
				stats.AssetCounts[item.AssetID]++
			}
		}
	}

	return stats, nil
}

// FindTopAsset 找出热门资产
func (dao *OrderStatisticsBaseDAO) FindTopAsset(assetCounts map[string]int64, orders []interface{}) (string, string, int64) {
	if len(assetCounts) == 0 {
		return "", "", 0
	}

	var topAssetID string
	var maxCount int64

	for assetID, count := range assetCounts {
		if count > maxCount {
			maxCount = count
			topAssetID = assetID
		}
	}

	// 查找资产名称
	var topAssetName string
	for _, order := range orders {
		switch o := order.(type) {
		case *entity.OrderPending:
			if o.OrderItems != nil {
				for _, item := range o.OrderItems {
					if item.AssetID == topAssetID {
						topAssetName = item.AssetName
						break
					}
				}
			}
		case *entity.OrderPaid:
			if o.OrderItems != nil {
				for _, item := range o.OrderItems {
					if item.AssetID == topAssetID {
						topAssetName = item.AssetName
						break
					}
				}
			}
		case *entity.OrderShipped:
			if o.OrderItems != nil {
				for _, item := range o.OrderItems {
					if item.AssetID == topAssetID {
						topAssetName = item.AssetName
						break
					}
				}
			}
		case *entity.OrderCompleted:
			if o.OrderItems != nil {
				for _, item := range o.OrderItems {
					if item.AssetID == topAssetID {
						topAssetName = item.AssetName
						break
					}
				}
			}
		}
		if topAssetName != "" {
			break
		}
	}

	return topAssetID, topAssetName, maxCount
}