import puppeteer from 'puppeteer';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';
import { access } from 'fs/promises';

const __dir = dirname(fileURLToPath(import.meta.url));

async function fileExists(path) {
  try { await access(path); return true; } catch { return false; }
}
const root = resolve(__dir, '..');
const inputPath = resolve(root, 'output', 'book.html');
const outputPath = resolve(root, 'output', 'kaleidoskop.pdf');

async function generate() {
  try {
    await access(inputPath);
  } catch {
    console.error('output/book.html not found — run `pnpm build` first');
    process.exit(1);
  }

  // On ARM64 (e.g. WSL2 on Apple Silicon / Raspberry Pi), Puppeteer's bundled
  // Chrome is x86-64 and won't run. Use the system Chromium instead:
  //   sudo apt-get install -y chromium
  const systemChromium = '/usr/bin/chromium';
  const useSystem = await fileExists(systemChromium);

  console.log(`Launching Puppeteer (${useSystem ? 'system Chromium' : 'bundled Chrome'})…`);
  const browser = await puppeteer.launch({
    headless: true,
    ...(useSystem ? { executablePath: systemChromium } : {}),
  });
  const page = await browser.newPage();

  await page.goto(`file://${inputPath}`, { waitUntil: 'networkidle0' });

  // 8.75 × 8.75 inches = trim (8.5×8.5) + 0.125in bleed on each side
  await page.pdf({
    path: outputPath,
    width: '8.75in',
    height: '8.75in',
    printBackground: true,
    margin: { top: 0, bottom: 0, left: 0, right: 0 },
  });

  await browser.close();
  console.log(`PDF written to output/kaleidoskop.pdf`);
}

generate().catch(err => { console.error(err); process.exit(1); });