/**
 * Image optimization script for Tischlerei Staffenberger.
 * Generates WebP + JPEG variants at thumbnail (800px) and lightbox (1920px) sizes.
 * Output: images/optimized/{category}/{name}-{size}w.{ext}
 *
 * Run: node scripts/optimize-images.js
 */

'use strict';

const sharp = require('sharp');
const fs = require('fs');
const path = require('path');

const PROJECT_ROOT = path.join(__dirname, '..');
const INPUT_ROOT   = path.join(PROJECT_ROOT, 'images', 'fotowebsite');
const OUTPUT_ROOT  = path.join(PROJECT_ROOT, 'images', 'optimized');

// Gallery categories: [input subdir, output subdir]
const GALLERY_DIRS = [
  ['küche',             'küche'],
  ['aussenbereich',     'aussenbereich'],
  ['sonderanfertigungen', 'sonderanfertigungen'],
];

const GALLERY_SIZES = [800, 1920];
const BANNER_SIZES  = [800, 1920];

function safeName(filename) {
  return path.basename(filename, path.extname(filename)).replace(/\s+/g, '-');
}

async function processImage(inputPath, outputDir, baseName, sizes) {
  fs.mkdirSync(outputDir, { recursive: true });

  for (const width of sizes) {
    const jpegOut = path.join(outputDir, `${baseName}-${width}w.jpg`);
    const webpOut = path.join(outputDir, `${baseName}-${width}w.webp`);

    await sharp(inputPath)
      .resize({ width, withoutEnlargement: true })
      .jpeg({ quality: 85, mozjpeg: true })
      .toFile(jpegOut);

    await sharp(inputPath)
      .resize({ width, withoutEnlargement: true })
      .webp({ quality: 82 })
      .toFile(webpOut);

    const jpegSize = (fs.statSync(jpegOut).size / 1024).toFixed(0);
    const webpSize = (fs.statSync(webpOut).size / 1024).toFixed(0);
    console.log(`  ${path.basename(jpegOut)}: JPEG ${jpegSize}KB  WebP ${webpSize}KB`);
  }
}

async function main() {
  console.log('=== Tischlerei Staffenberger – Image Optimization ===\n');

  // --- Gallery images ---
  for (const [inputSubdir, outputSubdir] of GALLERY_DIRS) {
    const inputDir  = path.join(INPUT_ROOT, inputSubdir);
    const outputDir = path.join(OUTPUT_ROOT, outputSubdir);

    const files = fs.readdirSync(inputDir)
      .filter(f => /\.(jpe?g)$/i.test(f))
      .sort();

    console.log(`[${inputSubdir}] – ${files.length} images`);

    for (const file of files) {
      const inputPath = path.join(inputDir, file);
      const baseName  = safeName(file);
      await processImage(inputPath, outputDir, baseName, GALLERY_SIZES);
    }
  }

  // --- Banner ---
  const bannerInput = path.join(INPUT_ROOT, 'banner.jpg');
  const bannerOutput = OUTPUT_ROOT;
  console.log('\n[banner]');
  await processImage(bannerInput, bannerOutput, 'banner', BANNER_SIZES);

  console.log('\nDone.');
}

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