/**
 * 推荐码绑定API
 * 用于处理分享带来的推荐关系绑定
 */

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

/**
 * POST - 绑定推荐关系
 */
export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { userId, referralCode, openId } = body
    
    // 验证参数
    const effectiveUserId = userId || (openId ? `user_${openId.slice(-8)}` : null)
    if (!effectiveUserId || !referralCode) {
      return NextResponse.json({
        success: false,
        error: '用户ID和推荐码不能为空'
      }, { status: 400 })
    }
    
    // 查找推荐人
    const referrers = await query(
      'SELECT id, nickname, referral_code FROM users WHERE referral_code = ?',
      [referralCode]
    ) as any[]
    
    if (referrers.length === 0) {
      return NextResponse.json({
        success: false,
        error: '推荐码无效'
      }, { status: 400 })
    }
    
    const referrer = referrers[0]
    
    // 不能自己推荐自己
    if (referrer.id === effectiveUserId) {
      return NextResponse.json({
        success: false,
        error: '不能使用自己的推荐码'
      }, { status: 400 })
    }
    
    // 检查用户是否已有推荐人
    const users = await query(
      'SELECT id, referred_by FROM users WHERE id = ? OR open_id = ?',
      [effectiveUserId, openId || effectiveUserId]
    ) as any[]
    
    if (users.length === 0) {
      return NextResponse.json({
        success: false,
        error: '用户不存在'
      }, { status: 400 })
    }
    
    const user = users[0]
    
    if (user.referred_by) {
      return NextResponse.json({
        success: false,
        error: '已绑定其他推荐人'
      }, { status: 400 })
    }
    
    // 绑定推荐关系
    await query(
      'UPDATE users SET referred_by = ? WHERE id = ?',
      [referrer.id, user.id]
    )
    
    // 更新推荐人的推广数量
    await query(
      'UPDATE users SET referral_count = referral_count + 1 WHERE id = ?',
      [referrer.id]
    )
    
    // 创建推荐绑定记录
    const bindingId = 'bind_' + Date.now().toString(36) + Math.random().toString(36).substr(2, 6)
    const expiryDate = new Date()
    expiryDate.setDate(expiryDate.getDate() + 30) // 30天有效期
    
    try {
      await query(`
        INSERT INTO referral_bindings (
          id, referrer_id, referee_id, referral_code, status, expiry_date
        ) VALUES (?, ?, ?, ?, 'active', ?)
      `, [bindingId, referrer.id, user.id, referralCode, expiryDate])
    } catch (e) {
      console.log('[Referral Bind] 创建绑定记录失败（可能是重复绑定）:', e)
    }
    
    console.log(`[Referral Bind] 成功: ${user.id} -> ${referrer.id} (${referralCode})`)
    
    return NextResponse.json({
      success: true,
      message: '绑定成功',
      referrer: {
        id: referrer.id,
        nickname: referrer.nickname
      }
    })
    
  } catch (error) {
    console.error('[Referral Bind] 错误:', error)
    return NextResponse.json({
      success: false,
      error: '绑定失败: ' + (error as Error).message
    }, { status: 500 })
  }
}

/**
 * GET - 查询推荐关系
 */
export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url)
  const userId = searchParams.get('userId')
  const referralCode = searchParams.get('referralCode')
  
  try {
    if (referralCode) {
      // 查询推荐码对应的用户
      const users = await query(
        'SELECT id, nickname, avatar FROM users WHERE referral_code = ?',
        [referralCode]
      ) as any[]
      
      if (users.length === 0) {
        return NextResponse.json({
          success: false,
          error: '推荐码无效'
        }, { status: 404 })
      }
      
      return NextResponse.json({
        success: true,
        referrer: users[0]
      })
    }
    
    if (userId) {
      // 查询用户的推荐关系
      const users = await query(
        'SELECT id, referred_by 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]
      
      // 如果有推荐人，获取推荐人信息
      let referrer = null
      if (user.referred_by) {
        const referrers = await query(
          'SELECT id, nickname, avatar FROM users WHERE id = ?',
          [user.referred_by]
        ) as any[]
        if (referrers.length > 0) {
          referrer = referrers[0]
        }
      }
      
      // 获取该用户推荐的人
      const referees = await query(
        'SELECT id, nickname, avatar, created_at FROM users WHERE referred_by = ?',
        [userId]
      ) as any[]
      
      return NextResponse.json({
        success: true,
        referrer,
        referees,
        referralCount: referees.length
      })
    }
    
    return NextResponse.json({
      success: false,
      error: '请提供userId或referralCode参数'
    }, { status: 400 })
    
  } catch (error) {
    console.error('[Referral Bind] GET错误:', error)
    return NextResponse.json({
      success: false,
      error: '查询失败: ' + (error as Error).message
    }, { status: 500 })
  }
}