package service

import (
	"context"
	"fmt"
	"time"

	"order/dao"
	"order/model/dto"

	"github.com/gogf/gf/v2/frame/g"
)

// OrderStatistics 订单统计服务
type orderStatistics struct{}

// OrderStatistics 订单统计服务实例
var OrderStatistics = new(orderStatistics)

// GenerateDailyStatistics 生成日统计数据
func (s *orderStatistics) GenerateDailyStatistics(ctx context.Context, tenantID int64, date time.Time, force bool) error {
	g.Log().Infof(ctx, "开始生成租户 %d 在 %s 的日统计数据", tenantID, date.Format("2006-01-02"))

	// 检查是否已存在统计数据
	if !force {
		existing, err := dao.OrderDailyStatisticsDAOInstance.GetByTenantAndDate(ctx, tenantID, date)
		if err == nil && existing != nil {
			g.Log().Infof(ctx, "租户 %d 在 %s 的日统计数据已存在，跳过生成", tenantID, date.Format("2006-01-02"))
			return nil
		}
	}

	// 调用DAO层生成统计数据
	statistics, err := dao.OrderDailyStatisticsDAOInstance.GenerateStatistics(ctx, tenantID, date)
	if err != nil {
		return fmt.Errorf("生成日统计数据失败: %v", err)
	}

	// 保存统计数据
	err = dao.OrderDailyStatisticsDAOInstance.Update(ctx, statistics)
	if err != nil {
		return fmt.Errorf("保存日统计数据失败: %v", err)
	}

	g.Log().Infof(ctx, "租户 %d 在 %s 的日统计数据生成成功", tenantID, date.Format("2006-01-02"))
	return nil
}

// GenerateMonthlyStatistics 生成月统计数据
func (s *orderStatistics) GenerateMonthlyStatistics(ctx context.Context, tenantID int64, year int, month int, force bool) error {
	g.Log().Infof(ctx, "开始生成租户 %d 在 %d年%d月 的月统计数据", tenantID, year, month)

	// 计算月份的起止日期
	startDate := time.Date(year, time.Month(month), 1, 0, 0, 0, 0, time.Local)

	// 检查是否已存在统计数据
	if !force {
		existing, err := dao.OrderMonthlyStatisticsDAOInstance.GetByTenantAndDate(ctx, tenantID, startDate)
		if err == nil && existing != nil {
			g.Log().Infof(ctx, "租户 %d 在 %d年%d月 的月统计数据已存在，跳过生成", tenantID, year, month)
			return nil
		}
	}

	// 调用DAO层生成统计数据
	statistics, err := dao.OrderMonthlyStatisticsDAOInstance.GenerateStatistics(ctx, tenantID, year, month)
	if err != nil {
		return fmt.Errorf("生成月统计数据失败: %v", err)
	}

	// 保存统计数据
	err = dao.OrderMonthlyStatisticsDAOInstance.Update(ctx, statistics)
	if err != nil {
		return fmt.Errorf("保存月统计数据失败: %v", err)
	}

	g.Log().Infof(ctx, "租户 %d 在 %d年%d月 的月统计数据生成成功", tenantID, year, month)
	return nil
}

// GenerateQuarterlyStatistics 生成季度统计数据
func (s *orderStatistics) GenerateQuarterlyStatistics(ctx context.Context, tenantID int64, year int, quarter int, force bool) error {
	g.Log().Infof(ctx, "开始生成租户 %d 在 %d年第%d季度 的统计数据", tenantID, year, quarter)

	// 计算季度的起止月份
	startMonth := (quarter-1)*3 + 1
	startDate := time.Date(year, time.Month(startMonth), 1, 0, 0, 0, 0, time.Local)

	// 检查是否已存在统计数据
	if !force {
		existing, err := dao.OrderQuarterlyStatisticsDAOInstance.GetByTenantAndDate(ctx, tenantID, startDate)
		if err == nil && existing != nil {
			g.Log().Infof(ctx, "租户 %d 在 %d年第%d季度 的统计数据已存在，跳过生成", tenantID, year, quarter)
			return nil
		}
	}

	// 调用DAO层生成统计数据
	statistics, err := dao.OrderQuarterlyStatisticsDAOInstance.GenerateStatistics(ctx, tenantID, year, quarter)
	if err != nil {
		return fmt.Errorf("生成季度统计数据失败: %v", err)
	}

	// 保存统计数据
	err = dao.OrderQuarterlyStatisticsDAOInstance.Save(ctx, statistics)
	if err != nil {
		return fmt.Errorf("保存季度统计数据失败: %v", err)
	}

	g.Log().Infof(ctx, "租户 %d 在 %d年第%d季度 的统计数据生成成功", tenantID, year, quarter)
	return nil
}

// GenerateYearlyStatistics 生成年统计数据
func (s *orderStatistics) GenerateYearlyStatistics(ctx context.Context, tenantID int64, year int, force bool) error {
	g.Log().Infof(ctx, "开始生成租户 %d 在 %d年 的年统计数据", tenantID, year)

	// 计算年的起止日期
	startDate := time.Date(year, 1, 1, 0, 0, 0, 0, time.Local)

	// 检查是否已存在统计数据
	if !force {
		existing, err := dao.OrderYearlyStatisticsDAOInstance.GetByTenantAndDate(ctx, tenantID, startDate)
		if err == nil && existing != nil {
			g.Log().Infof(ctx, "租户 %d 在 %d年 的年统计数据已存在，跳过生成", tenantID, year)
			return nil
		}
	}

	// 调用DAO层生成统计数据
	statistics, err := dao.OrderYearlyStatisticsDAOInstance.GenerateStatistics(ctx, tenantID, year)
	if err != nil {
		return fmt.Errorf("生成年统计数据失败: %v", err)
	}

	// 保存统计数据
	err = dao.OrderYearlyStatisticsDAOInstance.Save(ctx, statistics)
	if err != nil {
		return fmt.Errorf("保存年统计数据失败: %v", err)
	}

	g.Log().Infof(ctx, "租户 %d 在 %d年 的年统计数据生成成功", tenantID, year)
	return nil
}

// GetStatistics 获取统计数据
func (s *orderStatistics) GetStatistics(ctx context.Context, req *dto.GetOrderStatisticsReq) (*dto.GetOrderStatisticsRes, error) {
	reportDate, err := time.Parse("2006-01-02", req.StartDate)
	if err != nil {
		return nil, fmt.Errorf("日期格式错误: %v", err)
	}

	var result *dto.OrderStatisticsDetail

	// 根据统计类型调用不同的DAO
	switch req.ReportType {
	case "daily":
		statistics, err := dao.OrderDailyStatisticsDAOInstance.GetByTenantAndDate(ctx, req.TenantID, reportDate)
		if err != nil {
			return nil, fmt.Errorf("获取日统计数据失败: %v", err)
		}
		if statistics != nil {
			result = &dto.OrderStatisticsDetail{
				ReportType:        "daily",
				ReportDate:        statistics.ReportDate,
				Period:            statistics.Period,
				TotalOrders:       statistics.TotalOrders,
				CompletedOrders:   statistics.CompletedOrders,
				CancelledOrders:   statistics.CancelledOrders,
				PaidOrders:        statistics.PaidOrders,
				TotalAmount:       statistics.TotalAmount,
				PaidAmount:        statistics.PaidAmount,
				RefundAmount:      0, // 需要根据实际业务添加
				NetAmount:         statistics.NetAmount,
				AverageOrderValue: statistics.AverageOrderValue,
				PaymentRate:       statistics.PaymentRate,
				CompletionRate:    statistics.CompletionRate,
				UniqueUsers:       statistics.UniqueUsers,
				NewUsers:          statistics.NewUsers,
				ReturningUsers:    statistics.ReturningUsers,
				TotalItems:        statistics.TotalItems,
				UniqueAssets:      statistics.UniqueAssets,
				TopAssetID:        statistics.TopAssetID,
				TopAssetName:      statistics.TopAssetName,
				TopAssetCount:     statistics.TopAssetCount,
				CreatedAt:         statistics.CreatedAt,
				UpdatedAt:         statistics.UpdatedAt,
			}
		}
	case "monthly":
		statistics, err := dao.OrderMonthlyStatisticsDAOInstance.GetByTenantAndDate(ctx, req.TenantID, reportDate)
		if err != nil {
			return nil, fmt.Errorf("获取月统计数据失败: %v", err)
		}
		if statistics != nil {
			result = &dto.OrderStatisticsDetail{
				ReportType:        "monthly",
				ReportDate:        statistics.ReportDate,
				Period:            statistics.Period,
				TotalOrders:       statistics.TotalOrders,
				CompletedOrders:   statistics.CompletedOrders,
				CancelledOrders:   statistics.CancelledOrders,
				PaidOrders:        statistics.PaidOrders,
				TotalAmount:       statistics.TotalAmount,
				PaidAmount:        statistics.PaidAmount,
				RefundAmount:      0, // 需要根据实际业务添加
				NetAmount:         statistics.NetAmount,
				AverageOrderValue: statistics.AverageOrderValue,
				PaymentRate:       statistics.PaymentRate,
				CompletionRate:    statistics.CompletionRate,
				UniqueUsers:       statistics.UniqueUsers,
				NewUsers:          statistics.NewUsers,
				ReturningUsers:    statistics.ReturningUsers,
				TotalItems:        statistics.TotalItems,
				UniqueAssets:      statistics.UniqueAssets,
				TopAssetID:        statistics.TopAssetID,
				TopAssetName:      statistics.TopAssetName,
				TopAssetCount:     statistics.TopAssetCount,
				CreatedAt:         statistics.CreatedAt,
				UpdatedAt:         statistics.UpdatedAt,
			}
		}
	case "quarterly":
		statistics, err := dao.OrderQuarterlyStatisticsDAOInstance.GetByTenantAndDate(ctx, req.TenantID, reportDate)
		if err != nil {
			return nil, fmt.Errorf("获取季度统计数据失败: %v", err)
		}
		if statistics != nil {
			result = &dto.OrderStatisticsDetail{
				ReportType:        "quarterly",
				ReportDate:        statistics.ReportDate,
				Period:            statistics.Period,
				TotalOrders:       statistics.TotalOrders,
				CompletedOrders:   statistics.CompletedOrders,
				CancelledOrders:   statistics.CancelledOrders,
				PaidOrders:        statistics.PaidOrders,
				TotalAmount:       statistics.TotalAmount,
				PaidAmount:        statistics.PaidAmount,
				RefundAmount:      0, // 需要根据实际业务添加
				NetAmount:         statistics.NetAmount,
				AverageOrderValue: statistics.AverageOrderValue,
				PaymentRate:       statistics.PaymentRate,
				CompletionRate:    statistics.CompletionRate,
				UniqueUsers:       statistics.UniqueUsers,
				NewUsers:          statistics.NewUsers,
				ReturningUsers:    statistics.ReturningUsers,
				TotalItems:        statistics.TotalItems,
				UniqueAssets:      statistics.UniqueAssets,
				TopAssetID:        statistics.TopAssetID,
				TopAssetName:      statistics.TopAssetName,
				TopAssetCount:     statistics.TopAssetCount,
				CreatedAt:         statistics.CreatedAt,
				UpdatedAt:         statistics.UpdatedAt,
			}
		}
	case "yearly":
		statistics, err := dao.OrderYearlyStatisticsDAOInstance.GetByTenantAndDate(ctx, req.TenantID, reportDate)
		if err != nil {
			return nil, fmt.Errorf("获取年度统计数据失败: %v", err)
		}
		if statistics != nil {
			result = &dto.OrderStatisticsDetail{
				ReportType:        "yearly",
				ReportDate:        statistics.ReportDate,
				Period:            statistics.Period,
				TotalOrders:       statistics.TotalOrders,
				CompletedOrders:   statistics.CompletedOrders,
				CancelledOrders:   statistics.CancelledOrders,
				PaidOrders:        statistics.PaidOrders,
				TotalAmount:       statistics.TotalAmount,
				PaidAmount:        statistics.PaidAmount,
				RefundAmount:      0, // 需要根据实际业务添加
				NetAmount:         statistics.NetAmount,
				AverageOrderValue: statistics.AverageOrderValue,
				PaymentRate:       statistics.PaymentRate,
				CompletionRate:    statistics.CompletionRate,
				UniqueUsers:       statistics.UniqueUsers,
				NewUsers:          statistics.NewUsers,
				ReturningUsers:    statistics.ReturningUsers,
				TotalItems:        statistics.TotalItems,
				UniqueAssets:      statistics.UniqueAssets,
				TopAssetID:        statistics.TopAssetID,
				TopAssetName:      statistics.TopAssetName,
				TopAssetCount:     statistics.TopAssetCount,
				CreatedAt:         statistics.CreatedAt,
				UpdatedAt:         statistics.UpdatedAt,
			}
		}
	default:
		return nil, fmt.Errorf("不支持的统计类型: %s", req.ReportType)
	}

	return &dto.GetOrderStatisticsRes{
		Statistics: result,
	}, nil
}

// GetStatisticsList 获取统计列表
func (s *orderStatistics) GetStatisticsList(ctx context.Context, req *dto.GetOrderStatisticsListReq) (*dto.GetOrderStatisticsListRes, error) {
	// 设置默认分页参数
	pageNum := req.PageNum
	if pageNum <= 0 {
		pageNum = 1
	}
	pageSize := req.PageSize
	if pageSize <= 0 {
		pageSize = 20
	}

	var startDate, endDate time.Time
	var err error

	if req.StartDate != "" {
		startDate, err = time.Parse("2006-01-02", req.StartDate)
		if err != nil {
			return nil, fmt.Errorf("开始日期格式错误: %v", err)
		}
	}

	if req.EndDate != "" {
		endDate, err = time.Parse("2006-01-02", req.EndDate)
		if err != nil {
			return nil, fmt.Errorf("结束日期格式错误: %v", err)
		}
		// 设置为当天的结束时间
		endDate = endDate.Add(24 * time.Hour).Add(-time.Second)
	}

	var result []*dto.OrderStatisticsDetail
	var totalCount int64

	// 根据统计类型调用不同的DAO
	switch req.ReportType {
	case "daily":
		list, count, err := dao.OrderDailyStatisticsDAOInstance.GetListByTenant(ctx, req.TenantID, startDate, endDate, pageNum, pageSize)
		if err != nil {
			return nil, fmt.Errorf("获取日统计列表失败: %v", err)
		}
		totalCount = count
		for _, item := range list {
			result = append(result, &dto.OrderStatisticsDetail{
				ReportType:        "daily",
				ReportDate:        item.ReportDate,
				Period:            item.Period,
				TotalOrders:       item.TotalOrders,
				CompletedOrders:   item.CompletedOrders,
				CancelledOrders:   item.CancelledOrders,
				PaidOrders:        item.PaidOrders,
				TotalAmount:       item.TotalAmount,
				PaidAmount:        item.PaidAmount,
				RefundAmount:      0, // 需要根据实际业务添加
				NetAmount:         item.NetAmount,
				AverageOrderValue: item.AverageOrderValue,
				PaymentRate:       item.PaymentRate,
				CompletionRate:    item.CompletionRate,
				UniqueUsers:       item.UniqueUsers,
				NewUsers:          item.NewUsers,
				ReturningUsers:    item.ReturningUsers,
				TotalItems:        item.TotalItems,
				UniqueAssets:      item.UniqueAssets,
				TopAssetID:        item.TopAssetID,
				TopAssetName:      item.TopAssetName,
				TopAssetCount:     item.TopAssetCount,
				CreatedAt:         item.CreatedAt,
				UpdatedAt:         item.UpdatedAt,
			})
		}
	case "monthly":
		// 月度统计需要添加分页查询方法到DAO中
		// 暂时返回空结果
		result = []*dto.OrderStatisticsDetail{}
		totalCount = 0
	case "quarterly":
		// 季度统计需要添加分页查询方法到DAO中
		// 暂时返回空结果
		result = []*dto.OrderStatisticsDetail{}
		totalCount = 0
	case "yearly":
		// 年度统计需要添加分页查询方法到DAO中
		// 暂时返回空结果
		result = []*dto.OrderStatisticsDetail{}
		totalCount = 0
	default:
		return nil, fmt.Errorf("不支持的统计类型: %s", req.ReportType)
	}

	return &dto.GetOrderStatisticsListRes{
		List:       result,
		TotalCount: totalCount,
		PageNum:    pageNum,
		PageSize:   pageSize,
	}, nil
}

// GenerateStatistics 生成统计数据
func (s *orderStatistics) GenerateStatistics(ctx context.Context, req *dto.GenerateOrderStatisticsReq) (*dto.GenerateOrderStatisticsRes, error) {
	reportDate := time.Now()
	if req.ReportDate != "" {
		var err error
		reportDate, err = time.Parse("2006-01-02", req.ReportDate)
		if err != nil {
			return &dto.GenerateOrderStatisticsRes{
				Success: false,
				Message: "日期格式错误，请使用YYYY-MM-DD格式",
			}, nil
		}
	}

	var err error

	switch req.ReportType {
	case "daily":
		err = s.GenerateDailyStatistics(ctx, req.TenantID, reportDate, req.Force)
	case "monthly":
		err = s.GenerateMonthlyStatistics(ctx, req.TenantID, reportDate.Year(), int(reportDate.Month()), req.Force)
	case "quarterly":
		quarter := (int(reportDate.Month())-1)/3 + 1
		err = s.GenerateQuarterlyStatistics(ctx, req.TenantID, reportDate.Year(), quarter, req.Force)
	case "yearly":
		err = s.GenerateYearlyStatistics(ctx, req.TenantID, reportDate.Year(), req.Force)
	default:
		return &dto.GenerateOrderStatisticsRes{
			Success: false,
			Message: "不支持的统计类型",
		}, nil
	}

	if err != nil {
		return &dto.GenerateOrderStatisticsRes{
			Success: false,
			Message: fmt.Sprintf("生成统计数据失败: %v", err),
		}, nil
	}

	return &dto.GenerateOrderStatisticsRes{
		Success: true,
		Message: "统计数据生成成功",
	}, nil
}