#!/usr/bin/env node

/**
 * Stirling PDF Sample Document Generator
 *
 * This script uses Puppeteer to generate a sample PDF from a HTML template.
 * The output is used in the onboarding tour and as a demo document
 * for users to experiment with Stirling PDF's features.
 */

import puppeteer from "puppeteer";
import { fileURLToPath } from "url";
import { dirname, join } from "path";
import { existsSync, mkdirSync, statSync } from "fs";

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const TEMPLATE_PATH = join(__dirname, "template.html");
const OUTPUT_DIR = join(__dirname, "../../public/samples");
const OUTPUT_PATH = join(OUTPUT_DIR, "Sample.pdf");

async function generatePDF() {
  console.log("🚀 Starting Stirling PDF sample document generation...\n");

  // Ensure output directory exists
  if (!existsSync(OUTPUT_DIR)) {
    mkdirSync(OUTPUT_DIR, { recursive: true });
    console.log(`✅ Created output directory: ${OUTPUT_DIR}`);
  }

  // Check if template exists
  if (!existsSync(TEMPLATE_PATH)) {
    console.error(`❌ Template file not found: ${TEMPLATE_PATH}`);
    process.exit(1);
  }

  console.log(`📄 Reading template: ${TEMPLATE_PATH}`);

  let browser;
  try {
    // Launch Puppeteer
    console.log("🌐 Launching browser...");
    browser = await puppeteer.launch({
      headless: "new",
      args: ["--no-sandbox", "--disable-setuid-sandbox"],
    });

    const page = await browser.newPage();

    // Set viewport to match A4 proportions
    await page.setViewport({
      width: 794, // A4 width in pixels at 96 DPI
      height: 1123, // A4 height in pixels at 96 DPI
      deviceScaleFactor: 2, // Higher quality rendering
    });

    // Navigate to the template file
    const fileUrl = `file://${TEMPLATE_PATH}`;
    console.log("📖 Loading HTML template...");
    await page.goto(fileUrl, {
      waitUntil: "networkidle0", // Wait for all resources to load
    });

    // Generate PDF with A4 dimensions
    console.log("📝 Generating PDF...");
    await page.pdf({
      path: OUTPUT_PATH,
      format: "A4",
      printBackground: true,
      margin: {
        top: 0,
        right: 0,
        bottom: 0,
        left: 0,
      },
      preferCSSPageSize: true,
    });

    console.log("\n✅ PDF generated successfully!");
    console.log(`📦 Output: ${OUTPUT_PATH}`);

    // Get file size
    const stats = statSync(OUTPUT_PATH);
    const fileSizeInKB = (stats.size / 1024).toFixed(2);
    console.log(`📊 File size: ${fileSizeInKB} KB`);
  } catch (error) {
    console.error("\n❌ Error generating PDF:", error.message);
    process.exit(1);
  } finally {
    if (browser) {
      await browser.close();
      console.log("🔒 Browser closed.");
    }
  }

  console.log("\n🎉 Done! Sample PDF is ready for use in Stirling PDF.\n");
}

// Run the generator
generatePDF().catch((error) => {
  console.error("Fatal error:", error);
  process.exit(1);
});