/**
 * Writes the Android app's native strings in every language the iOS app has
 * (android/app/src/main/res/values-*\/strings_native.xml).
 *
 * The widget gallery and the share sheet say the same on both platforms, so
 * their texts come from the iOS strings files (ios/App/TREKWidgets and
 * ShareExtension, <lang>.lproj/Localizable.strings); what only Android has (the
 * notification channels) lives in android-strings.json next to this script.
 * Run `node scripts/generate-android-strings.mjs` from client/ after changing either.
 */
import { mkdirSync, readFileSync, readdirSync, writeFileSync } from 'fs';
import { dirname, join } from 'path';
import { fileURLToPath } from 'url';

const clientDir = join(dirname(fileURLToPath(import.meta.url)), '..');
const ios = join(clientDir, 'ios', 'App');
const res = join(clientDir, 'android', 'app', 'src', 'main', 'res');
const androidOnly = JSON.parse(readFileSync(join(clientDir, 'scripts', 'android-strings.json'), 'utf8'));

/** Android's resource folder for an iOS language, where the two differ. */
const FOLDER = {
  en: 'values',
  he: 'values-iw',
  id: 'values-in',
  'pt-BR': 'values-pt-rBR',
  'zh-Hans': 'values-b+zh+Hans',
  'zh-Hant': 'values-b+zh+Hant',
};

/** iOS keys are dotted camelCase, Android names snake_case. */
const androidName = (key) =>
  key
    .replace(/([a-z])([A-Z])/g, '$1_$2')
    .toLowerCase()
    .replace(/\./g, '_');

function parseStrings(file) {
  const out = [];
  const text = readFileSync(file, 'utf8');
  for (const m of text.matchAll(/^"([^"]+)"\s*=\s*"((?:[^"\\]|\\.)*)";/gm)) out.push([m[1], m[2].replace(/\\"/g, '"')]);
  return out;
}

function escape(value) {
  let v = value.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
  v = v.replace(/\\/g, '\\\\').replace(/'/g, "\\'").replace(/"/g, '\\"');
  v = v.replace(/%@/g, '%1$s').replace(/%d/g, '%1$d');
  return /^[@?]/.test(v) ? `\\${v}` : v;
}

const languages = readdirSync(join(ios, 'TREKWidgets'))
  .filter((d) => d.endsWith('.lproj'))
  .map((d) => d.slice(0, -'.lproj'.length))
  .sort();

for (const lang of languages) {
  const widgets = parseStrings(join(ios, 'TREKWidgets', `${lang}.lproj`, 'Localizable.strings'));
  const share = parseStrings(join(ios, 'ShareExtension', `${lang}.lproj`, 'Localizable.strings'));
  const extra = androidOnly[lang];
  if (!extra) throw new Error(`android-strings.json has no ${lang}`);
  const rows = [...widgets, ...share].map(([key, value]) => [androidName(key), value]);
  // A widget with nothing to show yet says what the share sheet says without trips.
  rows.push(['widget_empty', Object.fromEntries(share)['share.noTrips']]);
  rows.push(...Object.entries(extra));
  const folder = join(res, FOLDER[lang] ?? `values-${lang}`);
  mkdirSync(folder, { recursive: true });
  const body = rows.map(([name, value]) => `    <string name="${name}">${escape(value)}</string>`).join('\n');
  writeFileSync(
    join(folder, 'strings_native.xml'),
    '<?xml version="1.0" encoding="utf-8"?>\n' +
      '<!-- Generated by client/scripts/generate-android-strings.mjs from the iOS widget and share\n' +
      '     sheet strings and scripts/android-strings.json. Edit those and run it again. -->\n' +
      `<resources>\n${body}\n</resources>\n`
  );
}
console.log(`wrote ${languages.length} languages`);