import { NextRequest, NextResponse } from 'next/server';
import { Event } from '../../types';
import { v4 as uuid } from 'uuid';
import clickhouse from '@/lib/clickhouse';

// Handler for POST request to track events
export async function POST(req: NextRequest) {
  try {
    // Parse request body
    const eventData = await req.json();
    
    // Validate required fields
    if (!eventData.event_type) {
      return NextResponse.json(
        { error: 'Missing required field: event_type' },
        { status: 400 }
      );
    }
    
    // Set default values for required fields if missing
    const event: Event = {
      // Core event fields
      event_id: eventData.event_id || uuid(),
      event_time: eventData.event_time || new Date().toISOString(),
      event_type: eventData.event_type,
      event_attributes: eventData.event_attributes || '{}',
      
      // Link information
      link_id: eventData.link_id || '',
      link_slug: eventData.link_slug || '',
      link_label: eventData.link_label || '',
      link_title: eventData.link_title || '',
      link_original_url: eventData.link_original_url || '',
      link_attributes: eventData.link_attributes || '{}',
      link_created_at: eventData.link_created_at || new Date().toISOString(),
      link_expires_at: eventData.link_expires_at || null,
      link_tags: eventData.link_tags || '[]',
      
      // User information
      user_id: eventData.user_id || '',
      user_name: eventData.user_name || '',
      user_email: eventData.user_email || '',
      user_attributes: eventData.user_attributes || '{}',
      
      // Team information
      team_id: eventData.team_id || '',
      team_name: eventData.team_name || '',
      team_attributes: eventData.team_attributes || '{}',
      
      // Project information
      project_id: eventData.project_id || '',
      project_name: eventData.project_name || '',
      project_attributes: eventData.project_attributes || '{}',
      
      // QR code information
      qr_code_id: eventData.qr_code_id || '',
      qr_code_name: eventData.qr_code_name || '',
      qr_code_attributes: eventData.qr_code_attributes || '{}',
      
      // Visitor information
      visitor_id: eventData.visitor_id || uuid(),
      session_id: eventData.session_id || uuid(),
      ip_address: eventData.ip_address || req.headers.get('x-forwarded-for')?.toString() || '',
      country: eventData.country || '',
      city: eventData.city || '',
      device_type: eventData.device_type || '',
      browser: eventData.browser || '',
      os: eventData.os || '',
      user_agent: eventData.user_agent || req.headers.get('user-agent')?.toString() || '',
      
      // Referrer information
      referrer: eventData.referrer || req.headers.get('referer')?.toString() || '',
      utm_source: eventData.utm_source || '',
      utm_medium: eventData.utm_medium || '',
      utm_campaign: eventData.utm_campaign || '',
      
      // Interaction information
      time_spent_sec: eventData.time_spent_sec || 0,
      is_bounce: eventData.is_bounce !== undefined ? eventData.is_bounce : true,
      is_qr_scan: eventData.is_qr_scan !== undefined ? eventData.is_qr_scan : false,
      conversion_type: eventData.conversion_type || '',
      conversion_value: eventData.conversion_value || 0,
    };
    
    // Insert event into ClickHouse
    await clickhouse.insert({
      table: 'events',
      values: [event],
      format: 'JSONEachRow',
    });
    
    // Return success response
    return NextResponse.json({ 
      success: true, 
      message: 'Event tracked successfully',
      event_id: event.event_id 
    }, { status: 201 });
    
  } catch (error) {
    console.error('Error tracking event:', error);
    return NextResponse.json(
      { error: 'Failed to track event', details: (error as Error).message },
      { status: 500 }
    );
  }
}