const fs = require('fs');
const path = require('path');
const sharp = require('sharp'); // npm install sharp --save-dev

const svgPath = path.join(__dirname, 'favicon.svg');
const pngPath = path.join(__dirname, 'favicon.png');
const appOutputDir = path.join(__dirname, '..', '..', 'app');

const faviconSizes = [16, 24, 32, 48, 64, 128, 256];

function detectSourceFile() {
  if (fs.existsSync(svgPath)) return { filePath: svgPath, type: 'svg' };
  if (fs.existsSync(pngPath)) return { filePath: pngPath, type: 'png' };
  throw new Error('Aucun fichier favicon.svg ou favicon.png trouvé dans dev/icons/');
}

function ensureDirectoryExists(directory) {
  if (!fs.existsSync(directory)) {
    fs.mkdirSync(directory, { recursive: true });
  }
}

async function generateFavicon() {
  try {
    const { filePath, type } = detectSourceFile();
    console.log(`Source détectée : ${type.toUpperCase()} (${path.basename(filePath)})`);

    ensureDirectoryExists(appOutputDir);

    const tempPngs = [];
    for (const size of faviconSizes) {
      const outPath = path.join(appOutputDir, `favicon-${size}.png`);
      await sharp(filePath)
        .resize(size, size)
        .png()
        .toFile(outPath);
      console.log(`${type.toUpperCase()} → PNG (${size}x${size}) ✅`);
      tempPngs.push(outPath);
    }

    await sharp(filePath)
      .resize(256, 256)
      .toFile(path.join(appOutputDir, 'favicon.ico'));
    console.log('favicon.ico créé ✅');

    for (const p of tempPngs) {
      fs.unlinkSync(p);
    }

    console.log('Génération du favicon terminée !');
  } catch (err) {
    console.error('Erreur lors de la génération du favicon :', err);
  }
}

generateFavicon();