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

const appSvgPath = path.resolve(__dirname, '../client/public/favicon.svg');
const traySvgPath = path.resolve(__dirname, '../client/public/tray-icon.svg');
const iconsDir = path.resolve(__dirname, '../client/public/icons');
const buildDir = path.resolve(__dirname, '../client/build');
const docsDir = path.resolve(__dirname, '../docs');

const iconSizes = [16, 24, 32, 48, 64, 128, 256, 512];
const trayIcons = [
  { name: 'tray-icon.png', size: 32 },
  { name: 'tray-icon@2x.png', size: 64 },
];

async function renderPng(sourceBuffer, targetPath, size) {
  await sharp(sourceBuffer)
    .resize(size, size, {
      fit: 'contain',
      kernel: sharp.kernel.lanczos3,
    })
    .png({
      compressionLevel: 9,
      adaptiveFiltering: true,
      palette: size <= 64,
    })
    .toFile(targetPath);
}

async function generate() {
  if (!fs.existsSync(appSvgPath)) {
    throw new Error(`App icon SVG not found: ${appSvgPath}`);
  }
  if (!fs.existsSync(traySvgPath)) {
    throw new Error(`Tray icon SVG not found: ${traySvgPath}`);
  }

  fs.mkdirSync(iconsDir, { recursive: true });
  fs.mkdirSync(buildDir, { recursive: true });
  fs.mkdirSync(docsDir, { recursive: true });

  const appSvg = fs.readFileSync(appSvgPath);
  const traySvg = fs.readFileSync(traySvgPath);

  for (const size of iconSizes) {
    await renderPng(appSvg, path.join(iconsDir, `icon-${size}.png`), size);
    console.log(`generated icon-${size}.png`);
  }

  for (const tray of trayIcons) {
    await renderPng(traySvg, path.join(iconsDir, tray.name), tray.size);
    console.log(`generated ${tray.name}`);
  }

  const logoPath = path.join(iconsDir, 'logo.png');
  await renderPng(appSvg, logoPath, 512);

  fs.copyFileSync(path.join(iconsDir, 'icon-256.png'), path.join(buildDir, 'icon.png'));
  fs.copyFileSync(logoPath, path.join(docsDir, 'logo.png'));

  console.log(`icon generation complete: ${iconsDir}`);
}

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