/**
 * 分销数据API - 增强版
 * 
 * 可见数据：
 * - 绑定用户数（当前有效绑定）
 * - 通过链接进的人数（总访问量）
 * - 带来的付款人数（已转化购买）
 * - 收益统计（90%归分发者）
 */

import { NextRequest, NextResponse } from 'next/server'
import { query, getConfig } from '@/lib/db'

// 分成比例（默认90%给推广者）
const DISTRIBUTOR_SHARE = 0.9

/**
 * GET - 获取分销数据
 */
export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url)
  const userId = searchParams.get('userId')
  
  if (!userId) {
    return NextResponse.json({
      success: false,
      error: '用户ID不能为空'
    }, { status: 400 })
  }
  
  try {
    // 获取分销配置
    let distributorShare = DISTRIBUTOR_SHARE
    try {
      const config = await getConfig('referral_config')
      if (config?.distributorShare) {
        distributorShare = config.distributorShare / 100
      }
    } catch (e) { /* 使用默认配置 */ }
    
    // 1. 获取用户基本信息
    const users = await query(`
      SELECT id, nickname, referral_code, earnings, pending_earnings, 
             withdrawn_earnings, referral_count
      FROM users WHERE id = ?
    `, [userId]) as any[]
    
    if (users.length === 0) {
      return NextResponse.json({
        success: false,
        error: '用户不存在'
      }, { status: 404 })
    }
    
    const user = users[0]
    
    // 2. 获取绑定关系统计（从referral_bindings表）
    let bindingStats = { total: 0, active: 0, converted: 0, expired: 0 }
    try {
      const bindings = await query(`
        SELECT 
          COUNT(*) as total,
          SUM(CASE WHEN status = 'active' AND expiry_date > NOW() THEN 1 ELSE 0 END) as active,
          SUM(CASE WHEN status = 'converted' THEN 1 ELSE 0 END) as converted,
          SUM(CASE WHEN status = 'expired' OR (status = 'active' AND expiry_date <= NOW()) THEN 1 ELSE 0 END) as expired
        FROM referral_bindings
        WHERE referrer_id = ?
      `, [userId]) as any[]
      
      if (bindings.length > 0) {
        bindingStats = {
          total: parseInt(bindings[0].total) || 0,
          active: parseInt(bindings[0].active) || 0,
          converted: parseInt(bindings[0].converted) || 0,
          expired: parseInt(bindings[0].expired) || 0
        }
      }
    } catch (e) { /* 忽略 */ }
    
    // 3. 获取通过链接进入的总人数（访问日志）
    let totalVisits = 0
    try {
      const visits = await query(`
        SELECT COUNT(DISTINCT visitor_id) as count 
        FROM referral_visits 
        WHERE referrer_id = ?
      `, [userId]) as any[]
      totalVisits = parseInt(visits[0]?.count) || 0
    } catch (e) { /* 访问记录表可能不存在 */ }
    
    // 如果没有访问记录表，用绑定总数替代
    if (totalVisits === 0) {
      totalVisits = bindingStats.total
    }
    
    // 4. 获取带来的付款人数和金额
    let paymentStats = { paidCount: 0, totalAmount: 0 }
    try {
      const payments = await query(`
        SELECT 
          COUNT(DISTINCT o.user_id) as paid_count,
          COALESCE(SUM(o.amount), 0) as total_amount
        FROM orders o
        JOIN referral_bindings rb ON o.user_id = rb.referee_id
        WHERE rb.referrer_id = ? AND o.status = 'paid'
      `, [userId]) as any[]
      
      if (payments.length > 0) {
        paymentStats = {
          paidCount: parseInt(payments[0].paid_count) || 0,
          totalAmount: parseFloat(payments[0].total_amount) || 0
        }
      }
    } catch (e) { /* 忽略 */ }
    
    // 5. 获取活跃绑定用户列表
    const activeBindings = await query(`
      SELECT rb.id, rb.referee_id, rb.expiry_date, rb.binding_date,
             u.nickname, u.avatar, u.has_full_book,
             DATEDIFF(rb.expiry_date, NOW()) as days_remaining
      FROM referral_bindings rb
      JOIN users u ON rb.referee_id = u.id
      WHERE rb.referrer_id = ? AND rb.status = 'active' AND rb.expiry_date > NOW()
      ORDER BY rb.binding_date DESC
      LIMIT 50
    `, [userId]) as any[]
    
    // 6. 获取已转化用户列表
    const convertedBindings = await query(`
      SELECT rb.id, rb.referee_id, rb.conversion_date, rb.commission_amount,
             u.nickname, u.avatar
      FROM referral_bindings rb
      JOIN users u ON rb.referee_id = u.id
      WHERE rb.referrer_id = ? AND rb.status = 'converted'
      ORDER BY rb.conversion_date DESC
      LIMIT 50
    `, [userId]) as any[]
    
    // 7. 获取收益明细
    let earningsDetails: any[] = []
    try {
      earningsDetails = await query(`
        SELECT o.id, o.order_sn, o.amount, o.product_type, o.pay_time,
               u.nickname as buyer_nickname,
               rb.commission_amount
        FROM orders o
        JOIN users u ON o.user_id = u.id
        JOIN referral_bindings rb ON o.user_id = rb.referee_id AND rb.referrer_id = ?
        WHERE o.status = 'paid'
        ORDER BY o.pay_time DESC
        LIMIT 30
      `, [userId]) as any[]
    } catch (e) { /* 忽略 */ }
    
    // 8. 计算预估收益
    const estimatedEarnings = paymentStats.totalAmount * distributorShare
    
    return NextResponse.json({
      success: true,
      data: {
        // === 核心可见数据 ===
        // 绑定用户数（当前有效绑定）
        bindingCount: bindingStats.active,
        // 通过链接进的人数
        visitCount: totalVisits,
        // 带来的付款人数
        paidCount: paymentStats.paidCount,
        
        // === 收益数据 ===
        // 已结算收益
        earnings: parseFloat(user.earnings) || 0,
        // 待结算收益
        pendingEarnings: parseFloat(user.pending_earnings) || 0,
        // 已提现金额
        withdrawnEarnings: parseFloat(user.withdrawn_earnings) || 0,
        // 预估总收益
        estimatedEarnings: Math.round(estimatedEarnings * 100) / 100,
        // 分成比例
        shareRate: Math.round(distributorShare * 100),
        
        // === 推荐码 ===
        referralCode: user.referral_code,
        referralCount: user.referral_count || bindingStats.total,
        
        // === 详细统计 ===
        stats: {
          totalBindings: bindingStats.total,
          activeBindings: bindingStats.active,
          convertedBindings: bindingStats.converted,
          expiredBindings: bindingStats.expired,
          // 即将过期（7天内）
          expiringCount: activeBindings.filter((b: any) => b.days_remaining <= 7 && b.days_remaining > 0).length,
          // 总支付金额
          totalPaymentAmount: paymentStats.totalAmount
        },
        
        // === 用户列表 ===
        activeUsers: activeBindings.map((b: any) => ({
          id: b.referee_id,
          nickname: b.nickname || '用户' + b.referee_id.slice(-4),
          avatar: b.avatar,
          daysRemaining: Math.max(0, b.days_remaining),
          hasFullBook: b.has_full_book,
          bindingDate: b.binding_date
        })),
        
        convertedUsers: convertedBindings.map((b: any) => ({
          id: b.referee_id,
          nickname: b.nickname || '用户' + b.referee_id.slice(-4),
          avatar: b.avatar,
          commission: parseFloat(b.commission_amount) || 0,
          conversionDate: b.conversion_date
        })),
        
        // === 收益明细 ===
        earningsDetails: earningsDetails.map((e: any) => ({
          id: e.id,
          orderSn: e.order_sn,
          amount: parseFloat(e.amount),
          commission: parseFloat(e.commission_amount) || parseFloat(e.amount) * distributorShare,
          productType: e.product_type,
          buyerNickname: e.buyer_nickname,
          payTime: e.pay_time
        }))
      }
    })
    
  } catch (error) {
    console.error('[ReferralData] 错误:', error)
    return NextResponse.json({
      success: false,
      error: '获取分销数据失败: ' + (error as Error).message
    }, { status: 500 })
  }
}