import { chromium, type Browser, type Page } from 'playwright';

export interface PDFOptions {
  format?: string;
  landscape?: boolean;
  margin?: { top: number; right: number; bottom: number; left: number };
  printBackground?: boolean;
  headerTemplate?: string;
  footerTemplate?: string;
}

export class PDFConverterService {
  private browser: Browser | null = null;

  async initialize(): Promise<void> {
    if (this.browser) return;

    const launchOptions: Record<string, unknown> = {
      headless: true,
      args: ['--no-sandbox', '--disable-setuid-sandbox', '--disable-dev-shm-usage'],
    };

    if (process.env.PLAYWRIGHT_CHROMIUM_PATH) {
      launchOptions.executablePath = process.env.PLAYWRIGHT_CHROMIUM_PATH;
    }

    this.browser = await chromium.launch(launchOptions);
  }

  async close(): Promise<void> {
    if (this.browser) {
      await this.browser.close();
      this.browser = null;
    }
  }

  async convert(html: string, options: PDFOptions = {}): Promise<Buffer> {
    await this.initialize();
    if (!this.browser) throw new Error('PDF converter not initialized');

    const page: Page = await this.browser.newPage();
    try {
      await page.setContent(html, { waitUntil: 'networkidle' });
      await page.waitForTimeout(300);

      const pdf = await page.pdf({
        format: options.format as any || 'A4',
        landscape: options.landscape || false,
        printBackground: options.printBackground !== false,
        margin: options.margin
          ? {
              top: `${options.margin.top / 1440}in`,
              right: `${options.margin.right / 1440}in`,
              bottom: `${options.margin.bottom / 1440}in`,
              left: `${options.margin.left / 1440}in`,
            }
          : undefined,
        displayHeaderFooter: !!(options.headerTemplate || options.footerTemplate),
        headerTemplate: options.headerTemplate || '<div></div>',
        footerTemplate: options.footerTemplate || '<div></div>',
      });

      return pdf;
    } finally {
      await page.close();
    }
  }
}