#!/usr/bin/env node
/**
* balanced-fit probe: find the font size and explicit line breaks that give a
* headline N balanced lines (no runt first line, no widow last line) inside a
* fixed-width box — without relying on CSS `text-wrap: balance` support.
*
* Usage: node fit-title-probe.mjs
* Prints a table for the sample titles so the values can be baked into the renderer.
*/
import { execSync } from 'node:child_process';
import { writeFileSync, mkdirSync } from 'node:fs';
import { join } from 'node:path';
const CHROME = process.env.CHROME_PATH || 'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe';
const OUT = 'C:/Users/hoelee/Desktop/blog-og-image-redesign-brief/samples-v2';
mkdirSync(OUT, { recursive: true });
const TITLES = [
['en', 'Running Production Infrastructure Solo: 162 Containers Across Three Hosts'],
['en', 'Docker Reported Exit 0. The Kernel Had Already OOM-Killed It.'],
['zh', '独自运维 162 个生产容器：两起故障改变了我验证数字的方式'],
['zh', 'Docker 报 Exit 0，内核早已 OOM 杀死了它'],
];
const probe = ``;
const html = probe.replace('TITLES_JSON', JSON.stringify(TITLES));
const p = join(OUT, 'fit-probe.html');
writeFileSync(p, html, 'utf8');
const dom = execSync(
`"${CHROME}" --headless --dump-dom --virtual-time-budget=3000 --disable-gpu "file:///${p.replace(/\\/g, '/')}"`,
{ stdio: 'pipe', maxBuffer: 32 * 1024 * 1024 }
).toString('utf8');
const m = dom.match(/RESULT(.*?)<\/title>/s);
if (!m) {
console.error('probe did not return a result');
process.exit(1);
}
const rows = JSON.parse(m[1].replace(/"/g, '"').replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>'));
for (const r of rows) {
console.log(`\n[${r.lang}] ${r.t}`);
if (!r.out) { console.log(' NO FIT'); continue; }
console.log(` px=${r.out.px} lines=${r.out.lines.length} widths=[${r.out.widths.map(x => Math.round(x)).join(', ')}]`);
r.out.lines.forEach((l) => console.log(` | ${l}`));
}