/**
 * 用户绑定关系API
 * 获取指定用户的所有绑定用户列表
 * 
 * 优先从referral_bindings表查询，同时兼容users表的referred_by字段
 */
import { NextResponse } from 'next/server'
import { query } from '@/lib/db'

export async function GET(request: Request) {
  try {
    const { searchParams } = new URL(request.url)
    const userId = searchParams.get('userId')
    const referralCode = searchParams.get('code')
    
    if (!userId && !referralCode) {
      return NextResponse.json({
        success: false,
        error: '缺少用户ID或推广码'
      }, { status: 400 })
    }
    
    // 如果传入userId，先获取该用户的推广码
    let code = referralCode
    if (userId && !referralCode) {
      const userRows = await query('SELECT referral_code FROM users WHERE id = ?', [userId]) as any[]
      if (userRows.length === 0) {
        return NextResponse.json({
          success: false,
          error: '用户不存在'
        }, { status: 404 })
      }
      code = userRows[0].referral_code
    }
    
    let referrals: any[] = []
    
    // 1. 首先从referral_bindings表查询绑定关系
    try {
      const bindingsReferrals = await query(`
        SELECT 
          rb.id as binding_id,
          rb.referee_id,
          rb.status as binding_status,
          rb.binding_date,
          rb.expiry_date,
          rb.commission_amount,
          u.id, u.nickname, u.avatar, u.phone, u.open_id,
          u.has_full_book, u.purchased_sections,
          u.created_at, u.updated_at,
          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 = ?
        ORDER BY rb.binding_date DESC
      `, [userId]) as any[]
      
      if (bindingsReferrals.length > 0) {
        referrals = bindingsReferrals
      }
    } catch (e) {
      console.log('[Referrals] referral_bindings表查询失败，使用users表')
    }
    
    // 2. 如果referral_bindings表没有数据，再从users表查询
    if (referrals.length === 0 && code) {
      referrals = await query(`
        SELECT 
          id, nickname, avatar, phone, open_id,
          has_full_book, purchased_sections,
          created_at, updated_at,
          NULL as binding_status,
          NULL as binding_date,
          NULL as expiry_date,
          NULL as days_remaining,
          NULL as commission_amount
        FROM users 
        WHERE referred_by = ?
        ORDER BY created_at DESC
      `, [code]) as any[]
    }
    
    // 统计信息
    const purchasedCount = referrals.filter(r => 
      r.has_full_book || 
      r.binding_status === 'converted' ||
      (r.purchased_sections && r.purchased_sections !== '[]')
    ).length
    
    // 查询该用户的收益信息
    const earningsRows = await query(`
      SELECT earnings, pending_earnings, withdrawn_earnings 
      FROM users WHERE id = ?
    `, [userId]) as any[]
    
    const earnings = earningsRows[0] || { earnings: 0, pending_earnings: 0, withdrawn_earnings: 0 }
    
    // 格式化返回数据
    const formattedReferrals = referrals.map(r => ({
      id: r.referee_id || r.id,
      nickname: r.nickname || '微信用户',
      avatar: r.avatar,
      phone: r.phone ? r.phone.replace(/(\d{3})\d{4}(\d{4})/, '$1****$2') : null,
      hasOpenId: !!r.open_id,
      hasPurchased: r.has_full_book || r.binding_status === 'converted' || (r.purchased_sections && r.purchased_sections !== '[]'),
      hasFullBook: !!r.has_full_book,
      purchasedSections: typeof r.purchased_sections === 'string' 
        ? JSON.parse(r.purchased_sections || '[]').length 
        : 0,
      createdAt: r.binding_date || r.created_at,
      bindingStatus: r.binding_status || 'active',
      daysRemaining: r.days_remaining,
      commission: parseFloat(r.commission_amount) || 0,
      status: r.binding_status === 'converted' ? 'converted' 
        : r.has_full_book ? 'vip' 
        : (r.purchased_sections && r.purchased_sections !== '[]' ? 'paid' : 'active')
    }))
    
    return NextResponse.json({
      success: true,
      referrals: formattedReferrals,
      stats: {
        total: referrals.length,
        purchased: purchasedCount,
        free: referrals.length - purchasedCount,
        earnings: parseFloat(earnings.earnings) || 0,
        pendingEarnings: parseFloat(earnings.pending_earnings) || 0,
        withdrawnEarnings: parseFloat(earnings.withdrawn_earnings) || 0
      }
    })
    
  } catch (error) {
    console.error('Get referrals error:', error)
    return NextResponse.json({
      success: false,
      error: '获取绑定关系失败'
    }, { status: 500 })
  }
}