#!/usr/bin/env node
/*
 * Embeds the console page's per-language strings in the helper: every
 * <dir>/<lang>.json (client/dist-console/strings/, written by
 * `npm run build:console`) gzip'd at level 9 (no name, mtime 0, so the output
 * is reproducible) into one C file with the table webui_strings.h declares:
 *   { "<lang>", <gzip bytes>, <length> }, sorted by language.
 * payload/Makefile runs it after the page build; the helper serves each entry
 * at GET /strings/<lang>.json (webui_api.c).
 *
 * Usage: node scripts/embed-console-strings.mjs <strings dir> <out.c>
 */
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { gzipSync } from "node:zlib";

const LANG_RE = /^[a-z]{2}(-[A-Z]{2})?$/;

/** The C source for { lang: json text }. */
export function stringsTableC(files) {
  const langs = Object.keys(files).sort();
  if (langs.length === 0) throw new Error("embed-console-strings: no strings files");
  const out = [
    "/* Generated by scripts/embed-console-strings.mjs from client/dist-console/strings: do not edit. */",
    '#include "webui_strings.h"',
    "",
  ];
  langs.forEach((lang, i) => {
    if (!LANG_RE.test(lang)) throw new Error(`embed-console-strings: "${lang}" is not <ll> or <ll>-<RR>`);
    const gz = gzipSync(Buffer.from(files[lang], "utf8"), { level: 9 });
    const rows = [];
    for (let at = 0; at < gz.length; at += 16) {
      rows.push(`    ${Array.from(gz.subarray(at, at + 16), (b) => `0x${b.toString(16).padStart(2, "0")}`).join(", ")},`);
    }
    out.push(`static const unsigned char s_${i}[] = { /* ${lang}: ${gz.length} bytes */`, ...rows, "};");
  });
  out.push("", "const webui_strings_entry_t webui_strings_table[] = {");
  langs.forEach((lang, i) => out.push(`    { "${lang}", s_${i}, sizeof s_${i} },`));
  out.push("};", "const size_t webui_strings_count = sizeof webui_strings_table / sizeof webui_strings_table[0];", "");
  return out.join("\n");
}

function main() {
  const [dir, outPath] = process.argv.slice(2);
  if (!dir || !outPath) {
    console.error("usage: node scripts/embed-console-strings.mjs <strings dir> <out.c>");
    process.exit(2);
  }
  const files = {};
  for (const f of fs.readdirSync(dir).filter((n) => n.endsWith(".json"))) {
    files[f.slice(0, -".json".length)] = fs.readFileSync(path.join(dir, f), "utf8");
  }
  const c = stringsTableC(files);
  fs.writeFileSync(`${outPath}.tmp`, c);
  fs.renameSync(`${outPath}.tmp`, outPath);
  console.log(`console strings embedded: ${Object.keys(files).length} languages`);
}

if (process.argv[1] && path.resolve(process.argv[1]) === fileURLToPath(import.meta.url)) main();