import { simpleParser, ParsedMail, Attachment, HeaderValue, AddressObject } 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);

// Check if we're in a browser environment
const isBrowser = typeof window !== 'undefined';

export interface ParsedEmail {
  subject: string | null;
  from: string | null;
  to: string | null;
  cc: string | null;
  bcc: string | null;
  date: Date | null;
  html: string | null;
  text: string | null;
  attachments: Array<{
    filename: string;
    contentType: string;
    size: number;
  }>;
  headers: Record<string, any>;
}

function getAddressText(address: AddressObject | AddressObject[] | undefined): string | null {
  if (!address) return null;
  if (Array.isArray(address)) {
    return address.map(addr => addr.value?.[0]?.address || '').filter(Boolean).join(', ');
  }
  return address.value?.[0]?.address || null;
}

export async function decodeEmail(emailContent: string): Promise<ParsedEmail> {
  try {
    const response = await fetch('/api/parse-email', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ emailContent }),
    });

    if (!response.ok) {
      throw new Error('Failed to parse email');
    }

    const data = await response.json();
    return {
      ...data,
      date: data.date ? new Date(data.date) : null
    };
  } catch (error) {
    console.error('Error parsing email:', error);
    throw error;
  }
}

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;
  }
}