/**
 * 分销数据API
 * 获取用户的推广数据、绑定用户列表、收益统计
 */

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

/**
 * 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 {
    // 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. 获取推荐的用户列表
    const referees = await query(`
      SELECT id, nickname, avatar, phone, wechat_id, 
             has_full_book, created_at,
             DATEDIFF(DATE_ADD(created_at, INTERVAL 30 DAY), NOW()) as days_remaining
      FROM users 
      WHERE referred_by = ?
      ORDER BY created_at DESC
    `, [userId]) as any[]
    
    // 3. 分类绑定用户
    const now = new Date()
    const activeBindings: any[] = []
    const convertedBindings: any[] = []
    const expiredBindings: any[] = []
    
    for (const referee of referees) {
      const binding = {
        id: referee.id,
        nickname: referee.nickname || '用户' + referee.id.slice(-4),
        avatar: referee.avatar || `https://picsum.photos/100/100?random=${referee.id.slice(-2)}`,
        phone: referee.phone ? referee.phone.slice(0, 3) + '****' + referee.phone.slice(-4) : null,
        hasFullBook: referee.has_full_book,
        daysRemaining: Math.max(0, referee.days_remaining || 0),
        createdAt: referee.created_at
      }
      
      if (referee.has_full_book) {
        // 已转化（已购买）
        convertedBindings.push(binding)
      } else if (binding.daysRemaining <= 0) {
        // 已过期
        expiredBindings.push(binding)
      } else {
        // 活跃中
        activeBindings.push(binding)
      }
    }
    
    // 4. 获取收益明细（最近的订单）
    let earningsDetails: any[] = []
    try {
      earningsDetails = await query(`
        SELECT o.id, o.amount, o.product_type, o.created_at,
               u.nickname as buyer_nickname
        FROM orders o
        JOIN users u ON o.user_id = u.id
        WHERE u.referred_by = ? AND o.status = 'paid'
        ORDER BY o.created_at DESC
        LIMIT 20
      `, [userId]) as any[]
    } catch (e) {
      // 订单表可能不存在，忽略
    }
    
    // 5. 统计数据
    const stats = {
      totalReferrals: referees.length,
      activeCount: activeBindings.length,
      convertedCount: convertedBindings.length,
      expiredCount: expiredBindings.length,
      expiringCount: activeBindings.filter(b => b.daysRemaining <= 7).length
    }
    
    return NextResponse.json({
      success: true,
      data: {
        // 收益数据
        earnings: parseFloat(user.earnings) || 0,
        pendingEarnings: parseFloat(user.pending_earnings) || 0,
        withdrawnEarnings: parseFloat(user.withdrawn_earnings) || 0,
        
        // 推荐码
        referralCode: user.referral_code,
        referralCount: user.referral_count || referees.length,
        
        // 绑定用户分类
        activeBindings,
        convertedBindings,
        expiredBindings,
        
        // 统计
        stats,
        
        // 收益明细
        earningsDetails: earningsDetails.map(e => ({
          id: e.id,
          amount: parseFloat(e.amount) * 0.9, // 90%佣金
          productType: e.product_type,
          buyerNickname: e.buyer_nickname,
          createdAt: e.created_at
        }))
      }
    })
    
  } 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 })
  }
}