package service

import (
	"context"
	"time"

	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/global"
	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/internal/dto"
	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/internal/mysqldao"
	"git.lzcwy.cn/zhengchiliu/zt-closet-manage-backend/pkg/errcode"
)

// DashboardService 仪表盘统计服务。
type DashboardService struct {
	statsDao *mysqldao.StatsDao
}

// NewDashboardService 创建仪表盘服务。
func NewDashboardService() *DashboardService {
	return &DashboardService{statsDao: mysqldao.NewStatsDao()}
}

// Summary 聚合仪表盘核心指标：用户/订单/营收/待办。
func (s *DashboardService) Summary(ctx context.Context) (*dto.DashboardResponse, *errcode.Error) {
	ctx, span := global.Tracer.Start(ctx, "svc.DashboardSummary")
	defer span.End()

	todayStart := todayStartUnix()

	userStats, err := s.statsDao.UserStatsGet(ctx, todayStart)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	userStatusMap, err := s.statsDao.UserStatsGetByStatus(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	orderStats, err := s.statsDao.OrderStatsGet(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	revenueStats, err := s.statsDao.RevenueStatsGet(ctx, todayStart)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	todoStats, err := s.statsDao.TodoStatsGet(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	contentStats, err := s.statsDao.ContentStatsGet(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	now := nowUnix()
	vipStats, err := s.statsDao.VIPStatsGet(ctx, now, now+7*86400)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	goodsStats, err := s.statsDao.GoodsStatsGet(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}
	usageStats, err := s.statsDao.UsageStatsGet(ctx, todayStatDate())
	if err != nil {
		return nil, errcode.DatabaseError
	}
	socialStats, err := s.statsDao.SocialStatsGet(ctx)
	if err != nil {
		return nil, errcode.DatabaseError
	}

	return &dto.DashboardResponse{
		Users: dto.DashboardUsers{
			Total:       userStats.Total,
			TodayNew:    userStats.TodayNew,
			Normal:      userStatusMap[UserStatusNormal],
			TempBan:     userStatusMap[UserStatusTempBan],
			PermBan:     userStatusMap[UserStatusPermBan],
			Deactivated: userStatusMap[UserStatusDeactivated],
		},
		Orders: dto.DashboardOrders{
			Total:     orderStats.Total,
			Pending:   orderStats.Pending,
			Paid:      orderStats.Paid,
			Cancelled: orderStats.Cancelled,
			Expired:   orderStats.Expired,
			Refunded:  orderStats.Refunded,
		},
		Revenue: dto.DashboardRevenue{
			TotalRevenue: revenueStats.TotalRevenue,
			TodayRevenue: revenueStats.TodayRevenue,
			RefundTotal:  revenueStats.RefundTotal,
		},
		Todo: dto.DashboardTodo{
			RefundPending: todoStats.RefundPending,
			// 穿搭口径复用内容概况聚合结果，避免对 outfits 表重复计数。
			OutfitPublicTotal: contentStats.OutfitPublic,
			OutfitBanned:      contentStats.OutfitBanned,
			GoodsOnShelf:      todoStats.GoodsOnShelf,
		},
		Content: dto.DashboardContent{
			Outfit: dto.DashboardOutfitStats{
				Total:   contentStats.OutfitTotal,
				Public:  contentStats.OutfitPublic,
				Private: contentStats.OutfitPrivate,
				Banned:  contentStats.OutfitBanned,
			},
			Clothes: dto.DashboardClothesStats{
				Total:      contentStats.ClothesTotal,
				Processing: contentStats.ClothesProcessing,
				Success:    contentStats.ClothesSuccess,
				Failed:     contentStats.ClothesFailed,
			},
			Share: dto.DashboardShareStats{
				Total:     contentStats.ShareTotal,
				Normal:    contentStats.ShareNormal,
				Cancelled: contentStats.ShareCancelled,
				Expired:   contentStats.ShareExpired,
				Banned:    contentStats.ShareBanned,
			},
		},
		VIP: dto.DashboardVIP{
			MemberTotal:  vipStats.MemberTotal,
			Monthly:      vipStats.Monthly,
			Yearly:       vipStats.Yearly,
			Trial:        vipStats.Trial,
			ExpiringSoon: vipStats.ExpiringSoon,
		},
		Goods: dto.DashboardGoods{
			Total:    goodsStats.Total,
			OnShelf:  goodsStats.OnShelf,
			OffShelf: goodsStats.OffShelf,
			ByType:   buildGoodsTypeCounts(goodsStats.ByType),
		},
		Usage: dto.DashboardUsage{
			AIRecommend: usageStats.AIRecommend,
			ClosetShare: usageStats.ClosetShare,
			OutfitShare: usageStats.OutfitShare,
		},
		Social: dto.DashboardSocial{
			CosImageCount: socialStats.CosImageCount,
			LikeCount:     socialStats.LikeCount,
			CollectCount:  socialStats.CollectCount,
		},
	}, nil
}

// buildGoodsTypeCounts 商品类型数量 DAO → DTO。
func buildGoodsTypeCounts(in []mysqldao.GoodsTypeCount) []dto.GoodsTypeCount {
	out := make([]dto.GoodsTypeCount, 0, len(in))
	for _, v := range in {
		out = append(out, dto.GoodsTypeCount{Type: v.Type, Count: v.Count})
	}
	return out
}

// Trends 返回近 N 天趋势（新增用户/已支付订单量/营收，按天补零对齐）。
func (s *DashboardService) Trends(ctx context.Context, days int) (*dto.TrendResponse, *errcode.Error) {
	ctx, span := global.Tracer.Start(ctx, "svc.DashboardTrends")
	defer span.End()

	if days <= 0 {
		days = 30
	}
	if days > 90 {
		days = 90
	}

	startTs := todayStartUnix() - int64(days-1)*86400
	stats, err := s.statsDao.TrendStatsGet(ctx, startTs)
	if err != nil {
		return nil, errcode.DatabaseError
	}

	loc := time.Now().Location()
	startDay := time.Unix(startTs, 0).In(loc)
	points := make([]dto.TrendPoint, 0, days)
	for i := 0; i < days; i++ {
		date := startDay.AddDate(0, 0, i).Format("2006-01-02")
		points = append(points, dto.TrendPoint{
			Date:     date,
			NewUsers: stats.NewUsers[date],
			Orders:   stats.Orders[date],
			Revenue:  stats.Revenue[date],
		})
	}

	return &dto.TrendResponse{Points: points}, nil
}