/**
 * 管理端分销数据概览API - 从真实数据库查询
 */

import { NextRequest, NextResponse } from 'next/server'
import { query } from '@/lib/db'
import { requireAdminResponse } from '@/lib/admin-auth'

export async function GET(req: NextRequest) {
  // 验证管理员权限
  const authErr = requireAdminResponse(req)
  if (authErr) return authErr

  try {
    const now = new Date()
    const today = now.toISOString().split('T')[0]
    const monthStart = new Date(now.getFullYear(), now.getMonth(), 1).toISOString()
    const sevenDaysLater = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000).toISOString()

    // === 1. 订单数据统计 ===
    let orderStats = {
      todayOrders: 0,
      todayAmount: 0,
      monthOrders: 0,
      monthAmount: 0,
      totalOrders: 0,
      totalAmount: 0
    }

    try {
      const orderResults = await query(`
        SELECT 
          COUNT(*) as total_count,
          COALESCE(SUM(amount), 0) as total_amount,
          COALESCE(SUM(CASE WHEN DATE(created_at) = ? THEN 1 ELSE 0 END), 0) as today_count,
          COALESCE(SUM(CASE WHEN DATE(created_at) = ? THEN amount ELSE 0 END), 0) as today_amount,
          COALESCE(SUM(CASE WHEN created_at >= ? THEN 1 ELSE 0 END), 0) as month_count,
          COALESCE(SUM(CASE WHEN created_at >= ? THEN amount ELSE 0 END), 0) as month_amount
        FROM orders 
        WHERE status = 'paid'
      `, [today, today, monthStart, monthStart]) as any[]

      if (orderResults.length > 0) {
        const r = orderResults[0]
        orderStats = {
          todayOrders: parseInt(r.today_count) || 0,
          todayAmount: parseFloat(r.today_amount) || 0,
          monthOrders: parseInt(r.month_count) || 0,
          monthAmount: parseFloat(r.month_amount) || 0,
          totalOrders: parseInt(r.total_count) || 0,
          totalAmount: parseFloat(r.total_amount) || 0
        }
      }
    } catch (e) {
      console.error('[Admin Overview] 订单统计失败:', e)
    }

    // === 2. 绑定数据统计 ===
    let bindingStats = {
      todayBindings: 0,
      todayConversions: 0,
      monthBindings: 0,
      monthConversions: 0,
      totalBindings: 0,
      totalConversions: 0,
      activeBindings: 0,
      expiredBindings: 0,
      expiringBindings: 0
    }

    try {
      const bindingResults = await query(`
        SELECT 
          COUNT(*) as total_count,
          SUM(CASE WHEN status = 'active' AND expiry_date > NOW() THEN 1 ELSE 0 END) as active_count,
          SUM(CASE WHEN status = 'converted' THEN 1 ELSE 0 END) as converted_count,
          SUM(CASE WHEN status = 'expired' OR (status = 'active' AND expiry_date <= NOW()) THEN 1 ELSE 0 END) as expired_count,
          SUM(CASE WHEN DATE(binding_date) = ? THEN 1 ELSE 0 END) as today_count,
          SUM(CASE WHEN DATE(binding_date) = ? AND status = 'converted' THEN 1 ELSE 0 END) as today_converted,
          SUM(CASE WHEN binding_date >= ? THEN 1 ELSE 0 END) as month_count,
          SUM(CASE WHEN binding_date >= ? AND status = 'converted' THEN 1 ELSE 0 END) as month_converted,
          SUM(CASE WHEN status = 'active' AND expiry_date <= ? AND expiry_date > NOW() THEN 1 ELSE 0 END) as expiring_count
        FROM referral_bindings
      `, [today, today, monthStart, monthStart, sevenDaysLater]) as any[]

      if (bindingResults.length > 0) {
        const r = bindingResults[0]
        bindingStats = {
          todayBindings: parseInt(r.today_count) || 0,
          todayConversions: parseInt(r.today_converted) || 0,
          monthBindings: parseInt(r.month_count) || 0,
          monthConversions: parseInt(r.month_converted) || 0,
          totalBindings: parseInt(r.total_count) || 0,
          totalConversions: parseInt(r.converted_count) || 0,
          activeBindings: parseInt(r.active_count) || 0,
          expiredBindings: parseInt(r.expired_count) || 0,
          expiringBindings: parseInt(r.expiring_count) || 0
        }
      }
    } catch (e) {
      console.error('[Admin Overview] 绑定统计失败:', e)
    }

    // === 3. 收益数据统计 ===
    let earningsStats = {
      totalEarnings: 0,
      todayEarnings: 0,
      monthEarnings: 0,
      pendingEarnings: 0
    }

    try {
      // 从 users 表累加所有用户的收益
      const earningsResults = await query(`
        SELECT 
          COALESCE(SUM(earnings), 0) as total_earnings,
          COALESCE(SUM(pending_earnings), 0) as pending_earnings
        FROM users
      `) as any[]

      if (earningsResults.length > 0) {
        earningsStats.totalEarnings = parseFloat(earningsResults[0].total_earnings) || 0
        earningsStats.pendingEarnings = parseFloat(earningsResults[0].pending_earnings) || 0
      }

      // 今日和本月收益：从 orders 表计算（status='paid' 的订单）
      const periodEarningsResults = await query(`
        SELECT 
          COALESCE(SUM(CASE WHEN DATE(pay_time) = ? THEN amount * 0.9 ELSE 0 END), 0) as today_earnings,
          COALESCE(SUM(CASE WHEN pay_time >= ? THEN amount * 0.9 ELSE 0 END), 0) as month_earnings
        FROM orders 
        WHERE status = 'paid'
      `, [today, monthStart]) as any[]

      if (periodEarningsResults.length > 0) {
        earningsStats.todayEarnings = parseFloat(periodEarningsResults[0].today_earnings) || 0
        earningsStats.monthEarnings = parseFloat(periodEarningsResults[0].month_earnings) || 0
      }
    } catch (e) {
      console.error('[Admin Overview] 收益统计失败:', e)
    }

    // === 4. 提现数据统计 ===
    let withdrawalStats = {
      pendingCount: 0,
      pendingAmount: 0
    }

    try {
      const withdrawalResults = await query(`
        SELECT 
          COUNT(*) as pending_count,
          COALESCE(SUM(amount), 0) as pending_amount
        FROM withdrawals 
        WHERE status = 'pending'
      `) as any[]

      if (withdrawalResults.length > 0) {
        withdrawalStats.pendingCount = parseInt(withdrawalResults[0].pending_count) || 0
        withdrawalStats.pendingAmount = parseFloat(withdrawalResults[0].pending_amount) || 0
      }
    } catch (e) {
      console.error('[Admin Overview] 提现统计失败:', e)
    }

    // === 5. 访问数据统计 ===
    let visitStats = {
      todayVisits: 0,
      monthVisits: 0,
      totalVisits: 0
    }

    try {
      const visitResults = await query(`
        SELECT 
          COUNT(*) as total_count,
          COUNT(DISTINCT CASE WHEN DATE(created_at) = ? THEN id END) as today_count,
          COUNT(DISTINCT CASE WHEN created_at >= ? THEN id END) as month_count
        FROM referral_visits
      `, [today, monthStart]) as any[]

      if (visitResults.length > 0) {
        visitStats.totalVisits = parseInt(visitResults[0].total_count) || 0
        visitStats.todayVisits = parseInt(visitResults[0].today_count) || 0
        visitStats.monthVisits = parseInt(visitResults[0].month_count) || 0
      }
    } catch (e) {
      console.error('[Admin Overview] 访问统计失败:', e)
      // 访问表可能不存在，使用绑定数作为替代
      visitStats = {
        todayVisits: bindingStats.todayBindings,
        monthVisits: bindingStats.monthBindings,
        totalVisits: bindingStats.totalBindings
      }
    }

    // === 6. 分销商数据统计 ===
    let distributorStats = {
      totalDistributors: 0,
      activeDistributors: 0
    }

    try {
      const distributorResults = await query(`
        SELECT 
          COUNT(*) as total_count,
          SUM(CASE WHEN earnings > 0 THEN 1 ELSE 0 END) as active_count
        FROM users 
        WHERE referral_code IS NOT NULL AND referral_code != ''
      `) as any[]

      if (distributorResults.length > 0) {
        distributorStats.totalDistributors = parseInt(distributorResults[0].total_count) || 0
        distributorStats.activeDistributors = parseInt(distributorResults[0].active_count) || 0
      }
    } catch (e) {
      console.error('[Admin Overview] 分销商统计失败:', e)
    }

    // === 7. 计算转化率 ===
    const conversionRate = visitStats.totalVisits > 0 
      ? ((bindingStats.totalConversions / visitStats.totalVisits) * 100).toFixed(2)
      : '0.00'

    // 返回完整概览数据
    const overview = {
      // 今日数据
      todayClicks: visitStats.todayVisits,
      todayBindings: bindingStats.todayBindings,
      todayConversions: bindingStats.todayConversions,
      todayEarnings: earningsStats.todayEarnings,

      // 本月数据
      monthClicks: visitStats.monthVisits,
      monthBindings: bindingStats.monthBindings,
      monthConversions: bindingStats.monthConversions,
      monthEarnings: earningsStats.monthEarnings,

      // 总计数据
      totalClicks: visitStats.totalVisits,
      totalBindings: bindingStats.totalBindings,
      totalConversions: bindingStats.totalConversions,
      totalEarnings: earningsStats.totalEarnings,

      // 其他统计
      expiringBindings: bindingStats.expiringBindings,
      pendingWithdrawals: withdrawalStats.pendingCount,
      pendingWithdrawAmount: withdrawalStats.pendingAmount,
      conversionRate,
      totalDistributors: distributorStats.totalDistributors,
      activeDistributors: distributorStats.activeDistributors,
    }

    console.log('[Admin Overview] 数据统计完成:', overview)

    return NextResponse.json({
      success: true,
      overview
    })

  } catch (error) {
    console.error('[Admin Overview] 统计失败:', error)
    return NextResponse.json({
      success: false,
      error: '获取分销概览失败: ' + (error as Error).message
    }, { status: 500 })
  }
}