/**
 * 用户行为轨迹API
 * 
 * 记录用户的所有行为：
 * - 查看章节
 * - 购买行为
 * - 匹配操作
 * - 登录/注册
 * - 分享行为
 */

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

// 行为类型枚举
const ActionTypes = {
  VIEW_CHAPTER: 'view_chapter',      // 查看章节
  PURCHASE: 'purchase',              // 购买
  MATCH: 'match',                    // 匹配
  LOGIN: 'login',                    // 登录
  REGISTER: 'register',              // 注册
  SHARE: 'share',                    // 分享
  BIND_PHONE: 'bind_phone',          // 绑定手机
  BIND_WECHAT: 'bind_wechat',        // 绑定微信
  WITHDRAW: 'withdraw',              // 提现
  REFERRAL_CLICK: 'referral_click',  // 推荐链接点击
  REFERRAL_BIND: 'referral_bind',    // 推荐绑定
}

/**
 * POST - 记录用户行为
 */
export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { userId, phone, action, target, extraData } = body
    
    if (!userId && !phone) {
      return NextResponse.json({ 
        success: false, 
        error: '需要用户ID或手机号' 
      }, { status: 400 })
    }
    
    if (!action) {
      return NextResponse.json({ 
        success: false, 
        error: '行为类型不能为空' 
      }, { status: 400 })
    }
    
    // 如果只有手机号，查找用户ID
    let targetUserId = userId
    if (!userId && phone) {
      const users = await query('SELECT id FROM users WHERE phone = ?', [phone]) as any[]
      if (users.length > 0) {
        targetUserId = users[0].id
      } else {
        return NextResponse.json({ 
          success: false, 
          error: '用户不存在' 
        }, { status: 404 })
      }
    }
    
    // 记录行为轨迹
    const trackId = 'track_' + Date.now().toString(36) + Math.random().toString(36).substr(2, 6)
    
    await query(`
      INSERT INTO user_tracks (
        id, user_id, action, chapter_id, target, extra_data
      ) VALUES (?, ?, ?, ?, ?, ?)
    `, [
      trackId,
      targetUserId,
      action,
      action === 'view_chapter' ? target : null,
      target || null,
      extraData ? JSON.stringify(extraData) : null
    ])
    
    // 更新用户最后活跃时间
    await query('UPDATE users SET updated_at = NOW() WHERE id = ?', [targetUserId])
    
    return NextResponse.json({
      success: true,
      trackId,
      message: '行为记录成功'
    })
    
  } catch (error) {
    console.error('[User Track] POST Error:', error)
    return NextResponse.json({
      success: false,
      error: '记录行为失败: ' + (error as Error).message
    }, { status: 500 })
  }
}

/**
 * GET - 获取用户行为轨迹
 */
export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url)
  const userId = searchParams.get('userId')
  const phone = searchParams.get('phone')
  const action = searchParams.get('action')
  const limit = parseInt(searchParams.get('limit') || '50')
  
  try {
    // 确定查询条件
    let targetUserId = userId
    if (!userId && phone) {
      const users = await query('SELECT id FROM users WHERE phone = ?', [phone]) as any[]
      if (users.length > 0) {
        targetUserId = users[0].id
      } else {
        return NextResponse.json({ 
          success: false, 
          error: '用户不存在' 
        }, { status: 404 })
      }
    }
    
    if (!targetUserId) {
      return NextResponse.json({ 
        success: false, 
        error: '需要用户ID或手机号' 
      }, { status: 400 })
    }
    
    // 构建查询
    let sql = `
      SELECT ut.*
      FROM user_tracks ut
      WHERE ut.user_id = ?
    `
    const params: any[] = [targetUserId]
    
    if (action) {
      sql += ' AND ut.action = ?'
      params.push(action)
    }
    
    sql += ' ORDER BY ut.created_at DESC LIMIT ?'
    params.push(limit)
    
    const tracks = await query(sql, params) as any[]
    
    // 格式化轨迹数据
    const formattedTracks = tracks.map(t => ({
      id: t.id,
      action: t.action,
      actionLabel: getActionLabel(t.action),
      target: t.target || t.chapter_id,
      chapterTitle: t.chapter_id || null, // 直接使用chapter_id作为标题
      extraData: t.extra_data ? JSON.parse(t.extra_data) : null,
      createdAt: t.created_at,
      timeAgo: getTimeAgo(t.created_at)
    }))
    
    // 统计信息
    const stats = await query(`
      SELECT 
        action,
        COUNT(*) as count
      FROM user_tracks
      WHERE user_id = ?
      GROUP BY action
    `, [targetUserId]) as any[]
    
    return NextResponse.json({
      success: true,
      tracks: formattedTracks,
      stats: stats.reduce((acc, s) => ({ ...acc, [s.action]: s.count }), {}),
      total: formattedTracks.length
    })
    
  } catch (error) {
    console.error('[User Track] GET Error:', error)
    return NextResponse.json({
      success: false,
      error: '获取行为轨迹失败: ' + (error as Error).message
    }, { status: 500 })
  }
}

// 获取行为标签
function getActionLabel(action: string): string {
  const labels: Record<string, string> = {
    'view_chapter': '查看章节',
    'purchase': '购买',
    'match': '匹配伙伴',
    'login': '登录',
    'register': '注册',
    'share': '分享',
    'bind_phone': '绑定手机',
    'bind_wechat': '绑定微信',
    'withdraw': '提现',
    'referral_click': '点击推荐链接',
    'referral_bind': '推荐绑定',
  }
  return labels[action] || action
}

// 获取相对时间
function getTimeAgo(date: string | Date): string {
  const now = new Date()
  const then = new Date(date)
  const diffMs = now.getTime() - then.getTime()
  const diffMins = Math.floor(diffMs / 60000)
  const diffHours = Math.floor(diffMs / 3600000)
  const diffDays = Math.floor(diffMs / 86400000)
  
  if (diffMins < 1) return '刚刚'
  if (diffMins < 60) return `${diffMins}分钟前`
  if (diffHours < 24) return `${diffHours}小时前`
  if (diffDays < 7) return `${diffDays}天前`
  if (diffDays < 30) return `${Math.floor(diffDays / 7)}周前`
  return `${Math.floor(diffDays / 30)}个月前`
}