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

// Icon sizes for PWA
const sizes = [72, 96, 128, 144, 152, 192, 384, 512];

// Simple 1x1 blue PNG as base64 (we'll use this as a placeholder)
// Users should replace these with actual icons generated from the SVG
const createPlaceholderPNG = (size) => {
  // PNG header for a simple blue image
  // This creates a valid minimal PNG
  const png = Buffer.from([
    0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, // PNG signature
    0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52, // IHDR chunk start
    0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, // 1x1 pixels
    0x08, 0x02, 0x00, 0x00, 0x00, 0x90, 0x77, 0x53, // 8-bit RGB
    0xDE, 0x00, 0x00, 0x00, 0x0C, 0x49, 0x44, 0x41, // IDAT chunk
    0x54, 0x08, 0xD7, 0x63, 0x48, 0xC5, 0xD8, 0x60, // compressed blue pixel
    0x00, 0x00, 0x00, 0x83, 0x00, 0x81, 0x3D, 0xE7,
    0x79, 0xBA, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, // IEND chunk
    0x4E, 0x44, 0xAE, 0x42, 0x60, 0x82
  ]);
  return png;
};

// Generate placeholder icons
const iconsDir = path.join(__dirname, '../public/icons');

console.log('Generating placeholder icons...');
console.log('Note: Replace these with properly generated icons from icon.svg');
console.log('You can use tools like: https://realfavicongenerator.net/\n');

// For now, we'll copy the SVG as a reference and create instruction file
sizes.forEach(size => {
  const outputPath = path.join(iconsDir, `icon-${size}x${size}.png`);
  fs.writeFileSync(outputPath, createPlaceholderPNG(size));
  console.log(`Created placeholder: icon-${size}x${size}.png`);
});

// Create favicon placeholder
fs.writeFileSync(path.join(__dirname, '../public/favicon.png'), createPlaceholderPNG(32));
console.log('Created placeholder: favicon.png');

// Create apple-touch-icon placeholder
fs.writeFileSync(path.join(__dirname, '../public/apple-touch-icon.png'), createPlaceholderPNG(180));
console.log('Created placeholder: apple-touch-icon.png');

// Create instructions file
const instructions = `# PWA Icons Generation Instructions

The placeholder icons in this directory should be replaced with properly generated icons.

## Option 1: Use an online tool
1. Go to https://realfavicongenerator.net/
2. Upload the icon.svg file from this directory
3. Download the generated icons
4. Replace the placeholder PNGs

## Option 2: Use sharp (Node.js)
If you have libvips installed, you can use the generate-icons.js script:
\`\`\`bash
npm install sharp --save-dev
node scripts/generate-icons.js
\`\`\`

## Option 3: Use ImageMagick
If you have ImageMagick installed:
\`\`\`bash
for size in 72 96 128 144 152 192 384 512; do
  convert icon.svg -resize \${size}x\${size} icon-\${size}x\${size}.png
done
\`\`\`

## Required icon sizes:
- 72x72
- 96x96
- 128x128
- 144x144
- 152x152
- 192x192
- 384x384
- 512x512
- 180x180 (apple-touch-icon.png)
- 32x32 (favicon.png)
`;

fs.writeFileSync(path.join(iconsDir, 'README.md'), instructions);
console.log('\nCreated: icons/README.md with generation instructions');
console.log('\nPlaceholder icons generated successfully!');