package handler

import (
	"net/http"

	"soul-api/internal/database"
	"soul-api/internal/model"

	"github.com/gin-gonic/gin"
)

// AdminDashboardOverview GET /api/admin/dashboard/overview
// 数据概览：总用户、订单数（仅已付款）、转化率（有付款行为的用户数/总用户数）、总收入；最近订单与新注册用户均为实时查询。
func AdminDashboardOverview(c *gin.Context) {
	db := database.DB()

	var totalUsers int64
	db.Model(&model.User{}).Count(&totalUsers)

	var paidOrderCount int64
	db.Model(&model.Order{}).Where("status IN ?", []string{"paid", "completed", "success"}).Count(&paidOrderCount)

	var paidUserCount int64
	db.Model(&model.Order{}).Where("status IN ?", []string{"paid", "completed", "success"}).Distinct("user_id").Count(&paidUserCount)

	var totalRevenue float64
	db.Model(&model.Order{}).Where("status IN ?", []string{"paid", "completed", "success"}).Select("COALESCE(SUM(amount),0)").Scan(&totalRevenue)

	conversionRate := 0.0
	if totalUsers > 0 && paidUserCount > 0 {
		conversionRate = float64(paidUserCount) / float64(totalUsers) * 100
	}

	var recentOrders []model.Order
	db.Where("status IN ?", []string{"paid", "completed", "success"}).Order("created_at DESC").Limit(5).Find(&recentOrders)

	userIDs := make(map[string]bool)
	for _, o := range recentOrders {
		userIDs[o.UserID] = true
		if o.ReferrerID != nil && *o.ReferrerID != "" {
			userIDs[*o.ReferrerID] = true
		}
	}
	ids := make([]string, 0, len(userIDs))
	for id := range userIDs {
		ids = append(ids, id)
	}
	var orderUsers []model.User
	if len(ids) > 0 {
		db.Where("id IN ?", ids).Find(&orderUsers)
	}
	userMap := make(map[string]*model.User)
	for i := range orderUsers {
		userMap[orderUsers[i].ID] = &orderUsers[i]
	}

	recentOut := make([]gin.H, 0, len(recentOrders))
	for _, o := range recentOrders {
		u := userMap[o.UserID]
		nickname := ""
		phone := ""
		avatar := ""
		if u != nil {
			if u.Nickname != nil {
				nickname = *u.Nickname
			}
			if u.Phone != nil {
				phone = *u.Phone
			}
			if u.Avatar != nil {
				avatar = *u.Avatar
			}
		}
		referrerCode := ""
		if o.ReferralCode != nil {
			referrerCode = *o.ReferralCode
		} else if o.ReferrerID != nil && *o.ReferrerID != "" {
			if ru := userMap[*o.ReferrerID]; ru != nil && ru.ReferralCode != nil {
				referrerCode = *ru.ReferralCode
			}
		}
		recentOut = append(recentOut, gin.H{
			"id": o.ID, "orderSn": o.OrderSN, "userId": o.UserID, "userNickname": nickname, "userAvatar": avatar,
			"userPhone": phone,
			"amount": o.Amount, "status": ptrStr(o.Status), "productType": o.ProductType, "productId": o.ProductID, "description": o.Description,
			"referrerId": o.ReferrerID, "referralCode": referrerCode, "createdAt": o.CreatedAt, "paymentMethod": "微信",
		})
	}

	var newUsers []model.User
	db.Order("created_at DESC").Limit(5).Find(&newUsers)
	newUsersOut := make([]gin.H, 0, len(newUsers))
	for _, u := range newUsers {
		nickname := ""
		if u.Nickname != nil {
			nickname = *u.Nickname
		}
		phone := ""
		if u.Phone != nil {
			phone = *u.Phone
		}
		newUsersOut = append(newUsersOut, gin.H{
			"id": u.ID, "nickname": nickname, "phone": phone, "referralCode": u.ReferralCode, "createdAt": u.CreatedAt,
		})
	}

	c.JSON(http.StatusOK, gin.H{
		"success":         true,
		"totalUsers":      totalUsers,
		"paidOrderCount":  paidOrderCount,
		"paidUserCount":   paidUserCount,
		"totalRevenue":    totalRevenue,
		"conversionRate":  conversionRate,
		"recentOrders":    recentOut,
		"newUsers":        newUsersOut,
	})
}

func ptrStr(s *string) string {
	if s == nil {
		return ""
	}
	return *s
}