import { NextResponse } from 'next/server';
import { simpleParser, AddressObject } from 'mailparser';

function getEmailAddress(address: AddressObject | AddressObject[] | undefined): string | null {
  if (!address) return null;
  if (Array.isArray(address)) {
    return address.map(a => a.text).join(', ');
  }
  return address.text;
}

export async function POST(request: Request) {
  try {
    const body = await request.json();
    const { email } = body;
    
    if (!email || typeof email !== 'string') {
      return NextResponse.json(
        { error: 'Invalid email content' },
        { status: 400 }
      );
    }

    const parsed = await simpleParser(email);
    
    return NextResponse.json({
      subject: parsed.subject || null,
      from: getEmailAddress(parsed.from),
      to: getEmailAddress(parsed.to),
      cc: getEmailAddress(parsed.cc),
      bcc: getEmailAddress(parsed.bcc),
      date: parsed.date || null,
      html: parsed.html || null,
      text: parsed.textAsHtml || parsed.text || null,
      attachments: parsed.attachments?.map(att => ({
        filename: att.filename,
        contentType: att.contentType,
        size: att.size
      })) || [],
      headers: parsed.headers || {}
    });
  } catch (error) {
    console.error('Error parsing email:', error);
    return NextResponse.json(
      { error: 'Failed to parse email' },
      { status: 500 }
    );
  }
}