import fs from 'fs';
import path from 'path';
import puppeteer from 'puppeteer';

/**
 * Gera todos os ativos de marca a partir da geometria do logo:
 * favicons (transparentes), ícones de app (tile obsidiana), site.webmanifest
 * e a imagem de compartilhamento (Open Graph, 1200x630).
 *
 * Cores = tokens de app/globals.css. Uso: npm run favicons
 * (usa o Chrome do Puppeteer; defina CHROME_PATH para usar outro binário)
 */

const COR = {
	obsidiana: "#07090d",
	tealEscuro: "#2dd4bf",
	cobreEscuro: "#ffb39b",
	tealMedio: "#1a8f83", // legível em aba clara e escura
	cobreMedio: "#c8694e",
	texto: "#f4f6f8",
	suave: "#a6afbd",
};

const marca = (teal, cobre) => `
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" fill="none" stroke-linecap="round">
	<g stroke="${teal}" stroke-width="3.4"><path d="M2 21h7"/><path d="M2 32h7"/><path d="M2 43h7"/></g>
	<rect x="9.25" y="9.25" width="45.5" height="45.5" rx="13" stroke="${teal}" stroke-width="4.5"/>
	<g stroke="${cobre}" stroke-width="4.5"><path d="M19 21h26"/><path d="M19 32h21"/><path d="M19 43h15"/></g>
</svg>`;

function createIco(pngBuffers) {
	// pngBuffers: array of { width, height, buffer }
	const count = pngBuffers.length;
	const headerSize = 6;
	const dirEntrySize = 16;
	let offset = headerSize + dirEntrySize * count;

	const header = Buffer.alloc(headerSize);
	header.writeUInt16LE(0, 0); // reserved
	header.writeUInt16LE(1, 2); // ICO type
	header.writeUInt16LE(count, 4); // count

	const entries = [];
	for (const img of pngBuffers) {
		const entry = Buffer.alloc(dirEntrySize);
		entry.writeUInt8(img.width >= 256 ? 0 : img.width, 0);
		entry.writeUInt8(img.height >= 256 ? 0 : img.height, 1);
		entry.writeUInt8(0, 2); // colors
		entry.writeUInt8(0, 3); // reserved
		entry.writeUInt16LE(1, 4); // planes
		entry.writeUInt16LE(32, 6); // bpp
		entry.writeUInt32LE(img.buffer.length, 8); // size
		entry.writeUInt32LE(offset, 12); // offset
		entries.push(entry);
		offset += img.buffer.length;
	}

	return Buffer.concat([header, ...entries, ...pngBuffers.map(b => b.buffer)]);
}


const pagina = (corpo, css = "") => `<!DOCTYPE html><html><head><meta charset="utf-8">
<link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=Manrope:wght@400;500&family=Space+Grotesk:wght@600&display=block" rel="stylesheet">
<style>*{margin:0;padding:0;box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;background:transparent}${css}</style>
</head><body>${corpo}</body></html>`;

async function run() {
	const browser = await puppeteer.launch({
		executablePath: process.env.CHROME_PATH || undefined,
		args: ['--no-sandbox', '--disable-setuid-sandbox']
	});
	const page = await browser.newPage();

	// 1. Favicons: marca sozinha, fundo transparente. O logo ocupa x 2..55; centraliza.
	const favicon = pagina(`<div style="width:100%;height:100%;display:grid;place-items:center">${marca(COR.tealMedio, COR.cobreMedio).replace('<svg ', '<svg style="width:100%;height:100%;display:block" ')}</div>`);
	await page.setContent(favicon);
	const rendered = {};
	for (const size of [16, 32, 48]) {
		await page.setViewport({ width: size, height: size, deviceScaleFactor: 1 });
		rendered[size] = await page.screenshot({ type: 'png', omitBackground: true, clip: { x: 0, y: 0, width: size, height: size } });
	}

	// 2. Ícones de app: tile obsidiana, marca com margem de segurança (maskable).
	const tile = pagina(`<div style="width:100%;height:100%;background:${COR.obsidiana};display:grid;place-items:center">
		<div style="width:58%;height:58%;transform:translateX(5%)">${marca(COR.tealEscuro, COR.cobreEscuro).replace('<svg ', '<svg style="width:100%;height:100%;display:block" ')}</div></div>`);
	await page.setContent(tile);
	for (const size of [180, 192, 512]) {
		await page.setViewport({ width: size, height: size, deviceScaleFactor: 1 });
		rendered[size] = await page.screenshot({ type: 'png', clip: { x: 0, y: 0, width: size, height: size } });
	}

	// 3. Open Graph / Twitter: 1200x630.
	const og = pagina(`
	<main>
		<div class="topo">${marca(COR.tealEscuro, COR.cobreEscuro).replace('<svg ', '<svg class="logo" ')}<span class="nome">ESPDocs</span></div>
		<h1>Documentação do ESP32<br>em português</h1>
		<p>Especificações, pinagem, comparação e seleção das 12 séries do ESP32.</p>
		<div class="chips"><span>Séries</span><span>Seletor</span><span>Comparador</span><span>Diagnóstico</span><span>Livro</span></div>
	</main>
	<div class="barra"></div>`, `
	body{background:${COR.obsidiana};font-family:'Manrope',system-ui,sans-serif;color:${COR.texto};position:relative}
	body::before{content:"";position:absolute;inset:0;background:radial-gradient(52rem 30rem at 50% -14%,rgba(45,212,191,.16),transparent 70%),radial-gradient(40rem 26rem at 100% 30%,rgba(56,140,248,.09),transparent 70%)}
	main{position:relative;height:100%;padding:76px 88px 0}
	.topo{display:flex;align-items:center;gap:20px}
	.logo{width:68px;height:68px}
	.nome{font:600 44px 'Space Grotesk',sans-serif;letter-spacing:-0.045em}
	h1{margin-top:64px;font:600 86px/1.03 'Space Grotesk',sans-serif;letter-spacing:-0.04em}
	p{margin-top:30px;max-width:900px;font-size:30px;line-height:1.45;color:${COR.suave}}
	.chips{position:absolute;left:88px;bottom:62px;display:flex;gap:12px}
	.chips span{border:1.5px solid #2e3846;border-radius:999px;padding:9px 22px;font-size:22px;font-weight:500;color:${COR.texto}}
	.barra{position:absolute;left:0;right:0;bottom:0;height:10px;background:${COR.tealEscuro}}`);
	await page.setViewport({ width: 1200, height: 630, deviceScaleFactor: 1 });
	await page.setContent(og, { waitUntil: 'networkidle0' });
	await page.evaluate(() => document.fonts.ready);
	const ogPng = await page.screenshot({ type: 'png', clip: { x: 0, y: 0, width: 1200, height: 630 } });

	await browser.close();

	const icoBuffer = createIco([
		{ width: 16, height: 16, buffer: rendered[16] },
		{ width: 32, height: 32, buffer: rendered[32] },
		{ width: 48, height: 48, buffer: rendered[48] }
	]);
	fs.writeFileSync('public/favicon.ico', icoBuffer);
	fs.writeFileSync('public/favicon-48x48.png', rendered[48]);
	fs.writeFileSync('public/favicon-32x32.png', rendered[32]);
	fs.writeFileSync('public/favicon-16x16.png', rendered[16]);
	fs.writeFileSync('public/apple-touch-icon.png', rendered[180]);
	fs.writeFileSync('public/icon-192.png', rendered[192]);
	fs.writeFileSync('public/icon-512.png', rendered[512]);
	fs.writeFileSync('app/opengraph-image.png', ogPng);
	console.log('Favicons, ícones de app e imagem Open Graph gerados.');

	const manifest = {
		name: "ESPDocs",
		short_name: "ESPDocs",
		description: "Documentação do ecossistema ESP32 em português brasileiro",
		lang: "pt-BR",
		start_url: "/",
		display: "standalone",
		background_color: COR.obsidiana,
		theme_color: COR.obsidiana,
		icons: [
			{ src: "/favicon-48x48.png", sizes: "48x48", type: "image/png" },
			{ src: "/icon-192.png", sizes: "192x192", type: "image/png", purpose: "any maskable" },
			{ src: "/icon-512.png", sizes: "512x512", type: "image/png", purpose: "any maskable" }
		]
	};
	fs.writeFileSync('public/site.webmanifest', JSON.stringify(manifest, null, 2) + '\n');
	console.log('site.webmanifest gerado.');
}

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