import { NextRequest, NextResponse } from 'next/server';
import { getEvents } from '@/lib/analytics';
import { ApiResponse } from '@/lib/types';

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    
    // Get required parameters
    const slug = searchParams.get('slug');
    const domain = searchParams.get('domain');
    
    // If slug or domain is missing, return an error
    if (!slug || !domain) {
      return NextResponse.json({
        success: false,
        error: 'Missing required parameters: slug and domain are required'
      }, { status: 400 });
    }
    
    // Construct the shortUrl from domain and slug
    const shortUrl = `https://${domain}/${slug}`;
    
    // Log the request for debugging
    console.log('Activities API received parameters:', {
      slug,
      domain,
      shortUrl
    });
    
    // Set default page size and page
    const page = parseInt(searchParams.get('page') || '1');
    const pageSize = parseInt(searchParams.get('pageSize') || '50');
    
    // Optional date range parameters
    const startTime = searchParams.get('startTime') || undefined;
    const endTime = searchParams.get('endTime') || undefined;
    
    // Get events for the specified shortUrl
    const { events, total } = await getEvents({
      linkSlug: slug,
      page,
      pageSize,
      startTime,
      endTime,
      sortBy: 'event_time',
      sortOrder: 'desc'
    });
    
    // Process the events to extract useful information
    const processedEvents = events.map(event => {
      // Parse JSON strings to objects safely
      let eventAttributes: Record<string, unknown> = {};
      
      try {
        if (typeof event.event_attributes === 'string') {
          eventAttributes = JSON.parse(event.event_attributes);
        } else if (typeof event.event_attributes === 'object') {
          eventAttributes = event.event_attributes;
        }
      } catch {
        // Keep default empty object if parsing fails
      }
      
      // Extract tags
      let tags: string[] = [];
      
      try {
        if (typeof event.link_tags === 'string') {
          const parsedTags = JSON.parse(event.link_tags);
          if (Array.isArray(parsedTags)) {
            tags = parsedTags;
          }
        } else if (Array.isArray(event.link_tags)) {
          tags = event.link_tags;
        }
      } catch {
        // If parsing fails, keep tags as empty array
      }
      
      // Return a simplified event object
      return {
        id: event.event_id,
        type: event.event_type,
        time: event.event_time,
        visitor: {
          id: event.visitor_id,
          ipAddress: event.ip_address,
          userAgent: eventAttributes.user_agent as string || null,
          referrer: eventAttributes.referrer as string || null
        },
        device: {
          type: event.device_type,
          browser: event.browser,
          os: event.os
        },
        location: {
          country: event.country,
          city: event.city
        },
        link: {
          id: event.link_id,
          slug: event.link_slug,
          originalUrl: event.link_original_url,
          label: event.link_label,
          tags
        },
        utm: {
          source: eventAttributes.utm_source as string || null,
          medium: eventAttributes.utm_medium as string || null,
          campaign: eventAttributes.utm_campaign as string || null,
          term: eventAttributes.utm_term as string || null,
          content: eventAttributes.utm_content as string || null
        }
      };
    });
    
    // Return processed events
    const response: ApiResponse<typeof processedEvents> = {
      success: true,
      data: processedEvents,
      meta: {
        total,
        page,
        pageSize
      }
    };
    
    return NextResponse.json(response);
  } catch (error) {
    console.error('Error retrieving activities:', error);
    
    const response: ApiResponse<null> = {
      success: false,
      data: null,
      error: error instanceof Error ? error.message : 'An error occurred while retrieving activities'
    };
    
    return NextResponse.json(response, { status: 500 });
  }
}