package handler

import (
	"fmt"
	"net/http"
	"time"

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

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

// AdminDistributionOverview GET /api/admin/distribution/overview（全部使用 GORM，无 Raw SQL）
func AdminDistributionOverview(c *gin.Context) {
	now := time.Now()
	todayStart := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
	todayEnd := todayStart.Add(24 * time.Hour)
	monthStart := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
	db := database.DB()
	overview := gin.H{
		"todayClicks": 0, "todayBindings": 0, "todayConversions": 0, "todayEarnings": 0,
		"monthClicks": 0, "monthBindings": 0, "monthConversions": 0, "monthEarnings": 0,
		"totalClicks": 0, "totalBindings": 0, "totalConversions": 0, "totalEarnings": 0,
		"expiringBindings": 0, "pendingWithdrawals": 0, "pendingWithdrawAmount": 0,
		"conversionRate": "0.00", "totalDistributors": 0, "activeDistributors": 0,
	}

	// 订单：仅用 Where + Count / Select(Sum) 参数化
	var totalOrders int64
	db.Model(&model.Order{}).Where("status = ?", "paid").Count(&totalOrders)
	var totalAmount float64
	db.Model(&model.Order{}).Where("status = ?", "paid").Select("COALESCE(SUM(amount),0)").Scan(&totalAmount)
	var todayOrders int64
	db.Model(&model.Order{}).Where("status = ? AND created_at >= ? AND created_at < ?", "paid", todayStart, todayEnd).Count(&todayOrders)
	var todayAmount float64
	db.Model(&model.Order{}).Where("status = ? AND created_at >= ? AND created_at < ?", "paid", todayStart, todayEnd).Select("COALESCE(SUM(amount),0)").Scan(&todayAmount)
	var monthOrders int64
	db.Model(&model.Order{}).Where("status = ? AND created_at >= ?", "paid", monthStart).Count(&monthOrders)
	var monthAmount float64
	db.Model(&model.Order{}).Where("status = ? AND created_at >= ?", "paid", monthStart).Select("COALESCE(SUM(amount),0)").Scan(&monthAmount)
	overview["totalEarnings"] = totalAmount
	overview["todayEarnings"] = todayAmount
	overview["monthEarnings"] = monthAmount

	// 绑定：全部 GORM Where
	var totalBindings int64
	db.Model(&model.ReferralBinding{}).Count(&totalBindings)
	var converted int64
	db.Model(&model.ReferralBinding{}).Where("status = ?", "converted").Count(&converted)
	var todayBindings int64
	db.Model(&model.ReferralBinding{}).Where("binding_date >= ? AND binding_date < ?", todayStart, todayEnd).Count(&todayBindings)
	var todayConv int64
	db.Model(&model.ReferralBinding{}).Where("status = ? AND binding_date >= ? AND binding_date < ?", "converted", todayStart, todayEnd).Count(&todayConv)
	var monthBindings int64
	db.Model(&model.ReferralBinding{}).Where("binding_date >= ?", monthStart).Count(&monthBindings)
	var monthConv int64
	db.Model(&model.ReferralBinding{}).Where("status = ? AND binding_date >= ?", "converted", monthStart).Count(&monthConv)
	expiringEnd := now.Add(7 * 24 * time.Hour)
	var expiring int64
	db.Model(&model.ReferralBinding{}).Where("status = ? AND expiry_date > ? AND expiry_date <= ?", "active", now, expiringEnd).Count(&expiring)
	overview["totalBindings"] = totalBindings
	overview["totalConversions"] = converted
	overview["todayBindings"] = todayBindings
	overview["todayConversions"] = todayConv
	overview["monthBindings"] = monthBindings
	overview["monthConversions"] = monthConv
	overview["expiringBindings"] = expiring

	// 访问数（点击量）：总 / 今日 / 本月
	var visitTotal int64
	db.Model(&model.ReferralVisit{}).Count(&visitTotal)
	var todayClicks int64
	db.Model(&model.ReferralVisit{}).Where("created_at >= ? AND created_at < ?", todayStart, todayEnd).Count(&todayClicks)
	var monthClicks int64
	db.Model(&model.ReferralVisit{}).Where("created_at >= ?", monthStart).Count(&monthClicks)
	overview["totalClicks"] = visitTotal
	overview["todayClicks"] = todayClicks
	overview["monthClicks"] = monthClicks
	if visitTotal > 0 && converted > 0 {
		overview["conversionRate"] = formatPercent(float64(converted)/float64(visitTotal)*100)
	}

	// 今日独立访客数（按 visitor_id 或 visitor_openid 去重，空则用 id 占位）
	var todayUniqueVisitors int64
	db.Raw("SELECT COUNT(DISTINCT COALESCE(visitor_id, visitor_openid, CONCAT('_', id))) FROM referral_visits WHERE created_at >= ? AND created_at < ?", todayStart, todayEnd).Scan(&todayUniqueVisitors)
	overview["todayUniqueVisitors"] = todayUniqueVisitors
	// 今日总文章点击率：今日总点击 / 今日独立访客（人均点击），无访客时为 0
	todayClickRate := 0.0
	if todayUniqueVisitors > 0 && todayClicks > 0 {
		todayClickRate = float64(todayClicks) / float64(todayUniqueVisitors)
	}
	overview["todayClickRate"] = todayClickRate
	// 每篇文章今日点击量（按 page 分组）
	var pageClicks []struct {
		Page   string `gorm:"column:page"`
		Clicks int64  `gorm:"column:clicks"`
	}
	db.Raw("SELECT COALESCE(page, '') AS page, COUNT(*) AS clicks FROM referral_visits WHERE created_at >= ? AND created_at < ? GROUP BY COALESCE(page, '')", todayStart, todayEnd).Scan(&pageClicks)
	byPage := make([]gin.H, 0, len(pageClicks))
	for _, r := range pageClicks {
		byPage = append(byPage, gin.H{"page": r.Page, "clicks": r.Clicks})
	}
	overview["todayClicksByPage"] = byPage

	// 提现待处理
	var pendCount int64
	db.Model(&model.Withdrawal{}).Where("status = ?", "pending").Count(&pendCount)
	var pendSum float64
	db.Model(&model.Withdrawal{}).Where("status = ?", "pending").Select("COALESCE(SUM(amount),0)").Scan(&pendSum)
	overview["pendingWithdrawals"] = pendCount
	overview["pendingWithdrawAmount"] = pendSum

	// 分销商
	var distTotal int64
	db.Model(&model.User{}).Where("referral_code IS NOT NULL AND referral_code != ?", "").Count(&distTotal)
	var distActive int64
	db.Model(&model.User{}).Where("referral_code IS NOT NULL AND referral_code != ? AND earnings > ?", "", 0).Count(&distActive)
	overview["totalDistributors"] = distTotal
	overview["activeDistributors"] = distActive

	c.JSON(http.StatusOK, gin.H{"success": true, "overview": overview})
}

func formatPercent(v float64) string {
	return fmt.Sprintf("%.2f", v) + "%"
}