/**
 * 提现API
 * 用户提现到微信零钱或支付宝
 */

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

// 确保提现表存在
async function ensureWithdrawalsTable() {
  try {
    await query(`
      CREATE TABLE IF NOT EXISTS withdrawals (
        id VARCHAR(64) PRIMARY KEY,
        user_id VARCHAR(64) NOT NULL,
        amount DECIMAL(10,2) NOT NULL,
        account_type VARCHAR(20) DEFAULT 'wechat',
        account VARCHAR(100),
        status ENUM('pending', 'completed', 'failed') DEFAULT 'pending',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
        completed_at TIMESTAMP NULL,
        INDEX idx_user_id (user_id),
        INDEX idx_status (status)
      )
    `)
  } catch (e) {
    console.log('[Withdraw] 表已存在或创建失败')
  }
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { userId, amount } = body
    
    if (!userId) {
      return NextResponse.json({ success: false, message: '缺少用户ID' }, { status: 400 })
    }
    
    if (!amount || amount <= 0) {
      return NextResponse.json({ success: false, message: '提现金额无效' }, { status: 400 })
    }
    
    // 确保表存在
    await ensureWithdrawalsTable()
    
    // 查询用户信息
    const users = await query('SELECT * FROM users WHERE id = ?', [userId]) as any[]
    if (!users || users.length === 0) {
      return NextResponse.json({ success: false, message: '用户不存在' }, { status: 404 })
    }
    
    const user = users[0]
    
    // 检查是否绑定支付方式（微信号或支付宝）
    // 如果没有绑定，提示用户先绑定
    const wechatId = user.wechat || user.wechat_id || ''
    const alipayId = user.alipay || ''
    
    if (!wechatId && !alipayId) {
      return NextResponse.json({ 
        success: false, 
        message: '请先在设置中绑定微信号或支付宝',
        needBind: true 
      })
    }
    
    // 查询可提现金额（待结算收益）
    let totalEarnings = 0
    try {
      const earningsResult = await query(`
        SELECT COALESCE(SUM(commission), 0) as total_commission
        FROM referral_bindings
        WHERE referrer_id = ? AND status = 'converted'
      `, [userId]) as any[]
      totalEarnings = parseFloat(earningsResult[0]?.total_commission || 0)
    } catch (e) {
      // 如果表不存在，收益为0
      console.log('[Withdraw] 查询收益失败，可能表不存在')
    }
    
    // 查询已提现金额
    let withdrawnAmount = 0
    try {
      const withdrawnResult = await query(`
        SELECT COALESCE(SUM(amount), 0) as withdrawn
        FROM withdrawals
        WHERE user_id = ? AND status = 'completed'
      `, [userId]) as any[]
      withdrawnAmount = parseFloat(withdrawnResult[0]?.withdrawn || 0)
    } catch (e) {
      // 如果表不存在，已提现为0
    }
    
    const availableAmount = totalEarnings - withdrawnAmount
    
    if (amount > availableAmount) {
      return NextResponse.json({ 
        success: false, 
        message: `可提现金额不足，当前可提现 ¥${availableAmount.toFixed(2)}` 
      })
    }
    
    // 创建提现记录
    const withdrawId = `W${Date.now()}`
    const accountType = alipayId ? 'alipay' : 'wechat'
    const account = alipayId || wechatId
    
    try {
      await query(`
        INSERT INTO withdrawals (id, user_id, amount, account_type, account, status, created_at)
        VALUES (?, ?, ?, ?, ?, 'pending', NOW())
      `, [withdrawId, userId, amount, accountType, account])
      
      // TODO: 实际调用微信企业付款或支付宝转账API
      // 这里先模拟成功
      await query(`UPDATE withdrawals SET status = 'completed', completed_at = NOW() WHERE id = ?`, [withdrawId])
    } catch (e) {
      console.log('[Withdraw] 创建提现记录失败:', e)
    }
    
    return NextResponse.json({
      success: true,
      message: '提现成功',
      data: {
        withdrawId,
        amount,
        account,
        accountType: accountType === 'alipay' ? '支付宝' : '微信'
      }
    })
    
  } catch (error) {
    console.error('[Withdraw] Error:', error)
    return NextResponse.json({
      success: false,
      message: '提现失败: ' + String(error)
    }, { status: 500 })
  }
}