import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { createRequire } from "node:module";

// Re-parse PACKS by evaluating gen script is hard; instead diff en vs es.
const __dirname = path.dirname(fileURLToPath(import.meta.url));
const messagesDir = path.resolve(__dirname, "../src/lib/i18n/messages");

function parseMessageDict(source) {
	const dict = {};
	const re = /"([^"\\]+)"\s*:\s*((?:"(?:\\.|[^"\\])*")|(?:`(?:\\.|[^`\\])*`))/gs;
	let m;
	while ((m = re.exec(source))) {
		const key = m[1];
		const raw = m[2];
		dict[key] = raw.startsWith("`")
			? raw.slice(1, -1).replace(/\\`/g, "`").replace(/\\\$/g, "$").replace(/\\n/g, "\n")
			: JSON.parse(raw);
	}
	return dict;
}

const en = parseMessageDict(fs.readFileSync(path.join(messagesDir, "en.ts"), "utf8"));
const es = parseMessageDict(fs.readFileSync(path.join(messagesDir, "es.ts"), "utf8"));
const missing = {};
for (const [k, v] of Object.entries(en)) {
	if (es[k] === v) missing[k] = v; // likely untranslated (same as en) OR intentionally same
}
// Prefer keys not in our known translated set — dump all where es === en
fs.writeFileSync(path.join(__dirname, "_missing.json"), JSON.stringify(missing, null, 2), "utf8");
console.log(`candidates same-as-en: ${Object.keys(missing).length}`);