/**
 * 后台提现管理API
 * 获取所有提现记录，处理提现审批
 */
import { NextResponse } from 'next/server'
import { query } from '@/lib/db'

// 获取所有提现记录
export async function GET(request: Request) {
  try {
    const { searchParams } = new URL(request.url)
    const status = searchParams.get('status') // pending, success, failed, all
    
    let sql = `
      SELECT 
        w.*,
        u.nickname as user_nickname,
        u.phone as user_phone,
        u.avatar as user_avatar,
        u.referral_code
      FROM withdrawals w
      LEFT JOIN users u ON w.user_id = u.id
    `
    
    if (status && status !== 'all') {
      sql += ` WHERE w.status = '${status}'`
    }
    
    sql += ` ORDER BY w.created_at DESC LIMIT 100`
    
    const withdrawals = await query(sql) as any[]
    
    // 统计信息
    const statsResult = await query(`
      SELECT 
        COUNT(*) as total,
        SUM(CASE WHEN status = 'pending' THEN 1 ELSE 0 END) as pending_count,
        SUM(CASE WHEN status = 'pending' THEN amount ELSE 0 END) as pending_amount,
        SUM(CASE WHEN status = 'success' THEN 1 ELSE 0 END) as success_count,
        SUM(CASE WHEN status = 'success' THEN amount ELSE 0 END) as success_amount,
        SUM(CASE WHEN status = 'failed' THEN 1 ELSE 0 END) as failed_count
      FROM withdrawals
    `) as any[]
    
    const stats = statsResult[0] || {}
    
    return NextResponse.json({
      success: true,
      withdrawals: withdrawals.map(w => ({
        id: w.id,
        userId: w.user_id,
        userNickname: w.user_nickname || '未知用户',
        userPhone: w.user_phone,
        userAvatar: w.user_avatar,
        referralCode: w.referral_code,
        amount: parseFloat(w.amount),
        status: w.status,
        wechatOpenid: w.wechat_openid,
        transactionId: w.transaction_id,
        errorMessage: w.error_message,
        createdAt: w.created_at,
        processedAt: w.processed_at
      })),
      stats: {
        total: parseInt(stats.total) || 0,
        pendingCount: parseInt(stats.pending_count) || 0,
        pendingAmount: parseFloat(stats.pending_amount) || 0,
        successCount: parseInt(stats.success_count) || 0,
        successAmount: parseFloat(stats.success_amount) || 0,
        failedCount: parseInt(stats.failed_count) || 0
      }
    })
    
  } catch (error) {
    console.error('Get withdrawals error:', error)
    return NextResponse.json({
      success: false,
      error: '获取提现记录失败'
    }, { status: 500 })
  }
}

// 处理提现（审批/拒绝）
export async function PUT(request: Request) {
  try {
    const body = await request.json()
    const { id, action, reason } = body // action: approve, reject
    
    if (!id || !action) {
      return NextResponse.json({
        success: false,
        error: '缺少必要参数'
      }, { status: 400 })
    }
    
    // 获取提现记录
    const withdrawals = await query('SELECT * FROM withdrawals WHERE id = ?', [id]) as any[]
    if (withdrawals.length === 0) {
      return NextResponse.json({
        success: false,
        error: '提现记录不存在'
      }, { status: 404 })
    }
    
    const withdrawal = withdrawals[0]
    
    if (withdrawal.status !== 'pending') {
      return NextResponse.json({
        success: false,
        error: '该提现记录已处理'
      }, { status: 400 })
    }
    
    if (action === 'approve') {
      // 批准提现 - 更新状态为成功
      await query(`
        UPDATE withdrawals 
        SET status = 'success', processed_at = NOW(), transaction_id = ?
        WHERE id = ?
      `, [`manual_${Date.now()}`, id])
      
      // 更新用户已提现金额
      await query(`
        UPDATE users 
        SET withdrawn_earnings = withdrawn_earnings + ?, 
            pending_earnings = pending_earnings - ?
        WHERE id = ?
      `, [withdrawal.amount, withdrawal.amount, withdrawal.user_id])
      
      return NextResponse.json({
        success: true,
        message: '提现已批准'
      })
      
    } else if (action === 'reject') {
      // 拒绝提现 - 返还用户余额
      await query(`
        UPDATE withdrawals 
        SET status = 'failed', processed_at = NOW(), error_message = ?
        WHERE id = ?
      `, [reason || '管理员拒绝', id])
      
      // 返还用户余额
      await query(`
        UPDATE users 
        SET earnings = earnings + ?,
            pending_earnings = pending_earnings - ?
        WHERE id = ?
      `, [withdrawal.amount, withdrawal.amount, withdrawal.user_id])
      
      return NextResponse.json({
        success: true,
        message: '提现已拒绝，余额已返还'
      })
    }
    
    return NextResponse.json({
      success: false,
      error: '无效的操作'
    }, { status: 400 })
    
  } catch (error) {
    console.error('Process withdrawal error:', error)
    return NextResponse.json({
      success: false,
      error: '处理提现失败'
    }, { status: 500 })
  }
}