import log4js from 'log4js';
import { loadConfig } from '../config.js';

const config = loadConfig();
const logger = log4js.getLogger('PDF Factory');
logger.level = config.server.logLevel;

/**
 * Generates a PDF from HTML content using Puppeteer
 * @param {string} html - The HTML content to convert to PDF
 * @param {Object} options - PDF generation options
 * @param {number} options.width - Document width in mm
 * @param {number} options.height - Document height in mm
 * @returns {Promise<Buffer>} The PDF buffer
 */
export async function generatePDF(html, options = {}) {
  try {
    // Dynamically import puppeteer to handle cases where it might not be installed
    const puppeteer = await import('puppeteer');

    const browser = await puppeteer.default.launch({
      headless: true,
      args: ['--no-sandbox', '--disable-setuid-sandbox']
    });

    const page = await browser.newPage();

    // Set content with HTML
    await page.setContent(html, {
      waitUntil: 'networkidle0'
    });

    // Generate PDF with specified dimensions
    const pdfBuffer = await page.pdf({
      format: options.format || undefined,
      width: options.width ? `${options.width}mm` : undefined,
      height: options.height ? `${options.height}mm` : undefined,
      printBackground: true,
      preferCSSPageSize: true,
      margin: {
        top: '0mm',
        right: '0mm',
        bottom: '0mm',
        left: '0mm'
      }
    });

    await browser.close();

    return pdfBuffer;
  } catch (error) {
    logger.error('Error generating PDF:', error.message);
    throw error;
  }
}