import sharp from 'sharp';
import { mkdir, readFile, writeFile } from 'node:fs/promises';
import { join } from 'node:path';

const svgPath = 'src/lib/assets/favicon.svg';
const outDir = 'static';

const svg = await readFile(svgPath);
await mkdir(outDir, { recursive: true });
await writeFile(join(outDir, 'favicon.svg'), svg);

const sizes = [16, 32, 48, 72, 96, 128, 144, 152, 180, 192, 256, 384, 512];
for (const size of sizes) {
	await sharp(svg).resize(size, size).png().toFile(join(outDir, `icon-${size}x${size}.png`));
}

await sharp(svg).resize(180, 180).png().toFile(join(outDir, 'apple-touch-icon.png'));
await sharp(svg).resize(32, 32).png().toFile(join(outDir, 'favicon.png'));
await sharp(svg).resize(150, 150).png().toFile(join(outDir, 'mstile-150x150.png'));

async function maskable(size, name) {
	const pad = Math.round(size * 0.1);
	const inner = size - pad * 2;
	const icon = await sharp(svg).resize(inner, inner).png().toBuffer();
	await sharp({
		create: {
			width: size,
			height: size,
			channels: 4,
			background: { r: 18, g: 18, b: 18, alpha: 1 }
		}
	})
		.composite([{ input: icon, left: pad, top: pad }])
		.png()
		.toFile(join(outDir, name));
}

await maskable(192, 'maskable-icon-192x192.png');
await maskable(512, 'maskable-icon-512x512.png');

console.log('PWA icons written to static/');
console.log('Note: favicon.ico is not regenerated here; keep the existing multi-size .ico.');