import { NextResponse } from 'next/server';
import { simpleParser } from 'mailparser';
import DOMPurify from 'dompurify';
import { JSDOM } from 'jsdom';

// Create a window object for DOMPurify
const window = new JSDOM('').window;
const purify = DOMPurify(window);

function cleanHtml(html: string): string {
  try {
    return purify.sanitize(html, {
      ALLOWED_TAGS: ['p', 'br', 'div', 'span', 'a', 'img', 'strong', 'em', 'u', 'ul', 'ol', 'li', 'blockquote', 'pre', 'code', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
      ALLOWED_ATTR: ['href', 'src', 'alt', 'title', 'class', 'style'],
      ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|tel):|[^a-z]|[a-z+.\-]+(?:[^a-z+.\-:]|$))/i
    });
  } catch (error) {
    console.error('Error cleaning HTML:', error);
    return html;
  }
}

export async function POST(request: Request) {
  try {
    const { emailContent } = await request.json();
    
    if (!emailContent) {
      return NextResponse.json(
        { error: 'Email content is required' },
        { status: 400 }
      );
    }

    const parsed = await simpleParser(emailContent);
    
    return NextResponse.json({
      subject: parsed.subject || null,
      from: parsed.from?.text || null,
      to: parsed.to?.text || null,
      cc: parsed.cc?.text || null,
      bcc: parsed.bcc?.text || null,
      date: parsed.date || null,
      html: parsed.html ? cleanHtml(parsed.html) : null,
      text: parsed.text || null,
      attachments: parsed.attachments || [],
      headers: Object.fromEntries(parsed.headers)
    });
  } catch (error) {
    console.error('Error parsing email:', error);
    return NextResponse.json(
      { error: 'Failed to parse email' },
      { status: 500 }
    );
  }
}