import { NextRequest, NextResponse } from 'next/server';
import type { ApiResponse, EventsQueryParams, EventType, Event } from '@/lib/types';
import {
  getEvents,
  getEventsSummary,
  getTimeSeriesData,
  getGeoAnalytics,
  getDeviceAnalytics
} from '@/lib/analytics';
import clickhouse from '@/lib/clickhouse';
import { v4 as uuidv4 } from 'uuid';

// 获取事件列表
export async function GET(request: NextRequest) {
  try {
    const searchParams = request.nextUrl.searchParams;
    
    const params: EventsQueryParams = {
      startTime: searchParams.get('startTime') || undefined,
      endTime: searchParams.get('endTime') || undefined,
      eventType: searchParams.get('eventType') as EventType || undefined,
      linkId: searchParams.get('linkId') || undefined,
      linkSlug: searchParams.get('linkSlug') || undefined,
      userId: searchParams.get('userId') || undefined,
      teamId: searchParams.get('teamId') || undefined,
      projectId: searchParams.get('projectId') || undefined,
      page: searchParams.has('page') ? parseInt(searchParams.get('page')!, 10) : 1,
      pageSize: searchParams.has('pageSize') ? parseInt(searchParams.get('pageSize')!, 10) : 20,
      sortBy: searchParams.get('sortBy') || undefined,
      sortOrder: (searchParams.get('sortOrder') as 'asc' | 'desc') || undefined
    };

    const { events, total } = await getEvents(params);

    const response: ApiResponse<typeof events> = {
      success: true,
      data: events,
      meta: {
        total,
        page: params.page,
        pageSize: params.pageSize
      }
    };

    return NextResponse.json(response);
  } catch (error) {
    const response: ApiResponse<null> = {
      success: false,
      error: error instanceof Error ? error.message : 'Unknown error occurred'
    };
    return NextResponse.json(response, { status: 500 });
  }
}

// 写入事件数据
export async function POST(request: NextRequest) {
  try {
    // 解析请求体
    const eventData = await request.json();
    
    // 验证必填字段
    const requiredFields = ['event_type', 'link_id', 'visitor_id'];
    for (const field of requiredFields) {
      if (!eventData[field]) {
        return NextResponse.json({
          success: false,
          error: `Missing required field: ${field}`
        }, { status: 400 });
      }
    }
    
    // 生成事件ID和时间戳（如果未提供）
    const event: Record<string, any> = {
      ...eventData,
      event_id: eventData.event_id || uuidv4(),
      event_time: eventData.event_time || new Date().toISOString()
    };
    
    // 处理JSON字段（ClickHouse要求JSON字段为字符串）
    const jsonFields = [
      'event_attributes', 
      'link_attributes', 
      'user_attributes', 
      'team_attributes', 
      'project_attributes', 
      'qr_code_attributes'
    ];
    
    // 处理所有JSON对象字段
    jsonFields.forEach(field => {
      if (event[field] && typeof event[field] === 'object') {
        event[field] = JSON.stringify(event[field]);
      }
    });
    
    // 处理数组字段
    if (event.link_tags && Array.isArray(event.link_tags)) {
      event.link_tags = JSON.stringify(event.link_tags);
    }
    
    // 使用ClickHouse客户端插入数据
    await clickhouse.insert({
      table: 'events',
      values: [event],
      format: 'JSONEachRow'
    });
    
    const response: ApiResponse<{ event_id: string }> = {
      success: true,
      data: { event_id: event.event_id as string }
    };
    
    return NextResponse.json(response, { status: 201 });
  } catch (error) {
    console.error('Error inserting event:', error);
    
    const response: ApiResponse<null> = {
      success: false,
      error: error instanceof Error ? error.message : 'Unknown error occurred'
    };
    
    return NextResponse.json(response, { status: 500 });
  }
}