// Builds src/i18n/{sv,en}.json from docs/ux/strings.csv (the app's strings, SPEC §13.4) and src/i18n/web-strings.csv
// (web-only keys, prefix web_, same columns). Android placeholders become positional braces: %1$s and %1$d -> {1},
// a bare %d or %s -> {1}, {2}, … in order of appearance, %% -> %. Strings marked formatted=false are copied as is.
// Plurals keep their key:one / key:other keys. `--check` compares with the files on disk instead of writing.
import { existsSync, readFileSync, writeFileSync } from 'node:fs';
import { parseCsvRecords } from '../src/lib/csv.ts';

const root = new URL('../', import.meta.url);
const sources = [new URL('../docs/ux/strings.csv', root), new URL('src/i18n/web-strings.csv', root)];

export function convertPlaceholders(text, formatted) {
  if (!formatted) return text;
  let next = 0;
  return text.replace(/%(?:(\d+)\$)?([sd%])/g, (_match, index, type) => {
    if (type === '%') return '%';
    if (index) return `{${index}}`;
    next += 1;
    return `{${next}}`;
  });
}

export function buildCatalogs() {
  const catalogs = { en: {}, sv: {} };
  for (const source of sources) {
    for (const record of parseCsvRecords(readFileSync(source, 'utf-8'))) {
      const key = record.key;
      if (!key) continue;
      if (key in catalogs.en) throw new Error(`duplicate string key ${key} in ${source.pathname}`);
      const formatted = !(record.notes ?? '').includes('formatted=false');
      catalogs.en[key] = convertPlaceholders(record.en, formatted);
      catalogs.sv[key] = convertPlaceholders(record.sv, formatted);
    }
  }
  const sorted = (obj) =>
    Object.fromEntries(
      Object.keys(obj)
        .sort()
        .map((k) => [k, obj[k]]),
    );
  return { en: sorted(catalogs.en), sv: sorted(catalogs.sv) };
}

const check = process.argv.includes('--check');
const catalogs = buildCatalogs();
let stale = false;
for (const lang of ['sv', 'en']) {
  const target = new URL(`src/i18n/${lang}.json`, root);
  const text = JSON.stringify(catalogs[lang], null, 2) + '\n';
  if (check) {
    const current = existsSync(target) ? readFileSync(target, 'utf-8') : '';
    if (current !== text) {
      console.error(`src/i18n/${lang}.json is stale: run npm run i18n:import`);
      stale = true;
    }
  } else {
    writeFileSync(target, text);
    console.log(`src/i18n/${lang}.json: ${Object.keys(catalogs[lang]).length} keys`);
  }
}
if (stale) process.exit(1);