// Serves a build over HTTP for testing in a browser.
//
//   npm run serve            # build/web-mobile on http://localhost:8123
//   npm run serve -- 9000    # a different port
//
// Also serves one route of its own, `/_aspects`, which loads the game in fixed
// size iframes at the portrait extremes docs/UI.md asks for (4:3 to 21:9). The
// engine resizes itself to fill whatever window it is in, so an iframe is the
// only straightforward way to see the layout at a shape the desktop window is
// not — and the harness lives here rather than in the build folder because a
// rebuild wipes everything inside it.
import { createServer } from 'node:http';
import { readFile } from 'node:fs/promises';
import { extname, join, normalize, resolve } from 'node:path';

const ROOT = resolve(process.argv[3] ?? 'build/web-mobile');
const PORT = Number(process.argv[2] ?? 8123);

const TYPES = {
    '.html': 'text/html; charset=utf-8',
    '.js': 'text/javascript',
    '.mjs': 'text/javascript',
    '.json': 'application/json',
    '.css': 'text/css',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.webp': 'image/webp',
    '.wasm': 'application/wasm',
    '.bin': 'application/octet-stream',
};

/** width:height as a portrait phone reports it, from the widest to the tallest. */
const RATIOS = [
    ['4:3 — widest', 3 / 4],
    ['16:9', 9 / 16],
    ['21:9 — tallest', 9 / 21],
];

function aspectsPage(height, only) {
    // Booting three engines at once is slow enough to be painful; `?only=16:9`
    // renders a single viewport when that is all you need.
    const wanted = only
        ? RATIOS.filter(([label]) => label.toLowerCase().startsWith(only.toLowerCase()))
        : RATIOS;

    const cells = (wanted.length > 0 ? wanted : RATIOS).map(([label, ratio]) => {
        const width = Math.round(height * ratio);
        return `<div class="cell">
      <h2>${label} &mdash; ${width}&times;${height}</h2>
      <iframe src="index.html" width="${width}" height="${height}" loading="eager"></iframe>
    </div>`;
    }).join('\n');

    return `<!doctype html>
<meta charset="utf-8">
<title>Fool — portrait layout at 4:3, 16:9 and 21:9</title>
<style>
  body { margin: 0; background: #17181c; color: #ccd; font: 13px system-ui, sans-serif; }
  .row { display: flex; gap: 18px; padding: 14px; align-items: flex-start; }
  .cell h2 { font: 600 12px system-ui; margin: 0 0 6px; color: #8fa; text-align: center; }
  iframe { border: 1px solid #3a3d45; background: #000; display: block; }
</style>
<div class="row">
${cells}
</div>`;
}

createServer(async (request, response) => {
    const path = decodeURIComponent((request.url ?? '/').split('?')[0]);

    if (path === '/_aspects' || path === '/_aspects.html') {
        const query = new URL(request.url ?? '/', 'http://x').searchParams;
        const height = Number(query.get('h')) || 760;
        response.writeHead(200, { 'Content-Type': TYPES['.html'], 'Cache-Control': 'no-store' });
        response.end(aspectsPage(height, query.get('only')));
        return;
    }

    const file = join(ROOT, normalize(path === '/' ? '/index.html' : path));
    if (!file.startsWith(ROOT)) {
        response.writeHead(403);
        response.end('forbidden');
        return;
    }

    try {
        const body = await readFile(file);
        response.writeHead(200, {
            'Content-Type': TYPES[extname(file)] ?? 'application/octet-stream',
            'Cache-Control': 'no-store',
        });
        response.end(body);
    } catch {
        response.writeHead(404);
        response.end('not found');
    }
}).listen(PORT, () => {
    console.log(`serving ${ROOT}`);
    console.log(`  game     http://localhost:${PORT}/`);
    console.log(`  aspects  http://localhost:${PORT}/_aspects`);
    console.log(`  one      http://localhost:${PORT}/_aspects?only=16:9&h=900`);
});