import { NextRequest, NextResponse } from 'next/server';

export async function POST(request: NextRequest) {
  try {
    const { url } = await request.json();

    if (!url || typeof url !== 'string') {
      return NextResponse.json(
        { error: 'URL is required' },
        { status: 400 }
      );
    }

    // Fetch the URL content
    const response = await fetch(url, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
      }
    });

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const contentType = response.headers.get('content-type') || '';
    let content: string;

    if (contentType.includes('application/json')) {
      const json = await response.json();
      content = JSON.stringify(json, null, 2);
    } else if (contentType.includes('text/html')) {
      const html = await response.text();
      // Basic HTML to text conversion - remove tags and decode entities
      content = html
        .replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, '')
        .replace(/<style\b[^<]*(?:(?!<\/style>)<[^<]*)*<\/style>/gi, '')
        .replace(/<[^>]*>/g, '')
        .replace(/&nbsp;/g, ' ')
        .replace(/&amp;/g, '&')
        .replace(/&lt;/g, '<')
        .replace(/&gt;/g, '>')
        .replace(/&quot;/g, '"')
        .replace(/&#39;/g, "'")
        .replace(/\s+/g, ' ')
        .trim();
    } else {
      content = await response.text();
    }

    return NextResponse.json({ content });
  } catch (error) {
    console.error('Error fetching URL:', error);
    return NextResponse.json(
      { error: 'Failed to fetch URL content' },
      { status: 500 }
    );
  }
}