/**
 * MeshBay i18n — lightweight string localization.
 *
 * Usage:
 *   import { t, setLocale, getLocale, LOCALES } from './i18n.js';
 *   t('nav.logout')              // "Logout"
 *   t('status.files', { n: 42 }) // "42 files"
 */

const LANG_KEY = 'mb_lang';

// ── English strings ─────────────────────────────────────────────────────────

const en = {
  // Nav
  'nav.toggle_menu': 'Toggle menu',
  'nav.light_mode': 'Light mode',
  'nav.dark_mode': 'Dark mode',
  'nav.logout': 'Logout',
  'nav.login': 'Login',

  // Sidebar
  'sidebar.my_groups': 'My Groups',
  'sidebar.no_groups': 'No groups yet',
  'sidebar.discover': 'Discover',
  'sidebar.public_groups': 'Public groups',

  // Login
  'login.title': 'Login',
  'login.username': 'Username',
  'login.password': 'Password',
  'login.submit': 'Login',
  'login.loading': 'Logging in...',
  'login.no_account': 'No account?',
  'login.register_link': 'Register',

  // Register
  'register.title': 'Register',
  'register.username': 'Username',
  'register.email': 'Email',
  'register.password': 'Password (min 8 chars)',
  'register.confirm': 'Confirm password',
  'register.submit': 'Register',
  'register.loading': 'Creating account...',
  'register.has_account': 'Already have an account?',
  'register.login_link': 'Login',
  'register.success_title': 'Account created',
  'register.success_msg': 'You can now log in with your credentials.',
  'register.go_login': 'Go to login',
  'register.err_mismatch': 'Passwords do not match',
  'register.err_min_len': 'Password must be at least 8 characters',

  // Home
  'home.welcome': 'Welcome to MeshBay',
  'home.no_groups': 'You are not a member of any group yet.',
  'home.browse_prefix': 'Browse ',
  'home.browse_link': 'public groups',
  'home.browse_suffix': ' or ask a group admin to invite you.',
  'home.my_groups': 'My Groups',

  // Explore
  'explore.title': 'Public Groups',
  'explore.loading': 'Loading...',
  'explore.empty': 'No public groups available.',

  // Group page
  'group.default_name': 'Group',
  'group.tab_files': 'Files',
  'group.tab_chat': 'Chat',
  'group.filter': 'Filter files...',
  'group.col_name': 'Name',
  'group.col_size': 'Size',
  'group.col_type': 'Type',
  'group.col_date': 'Date',
  'group.empty_filter': 'No files match the filter',
  'group.empty_dir': 'This directory is empty',
  'group.download': 'Download',
  'group.play': 'Play',
  'group.dl_failed': 'Download failed: {err}',
  'group.offline_title': 'No nodes are currently online for this group.',
  'group.offline_hint': 'Files will appear when a node hosting this group connects.',
  'group.err_transport': 'Transport module not loaded',

  // Status
  'status.idle': 'Idle',
  'status.discovering': 'Finding nodes...',
  'status.connecting': 'Connecting via WebRTC...',
  'status.fetching': 'Fetching index...',
  'status.files': '{n} files',
  'status.offline': 'No nodes online',
  'status.error': 'Connection failed',

  // Chat
  'chat.empty': 'No messages yet. Start the conversation!',
  'chat.placeholder': 'Type a message...',
  'chat.send': 'Send',

  // Video player
  'video.loading': 'Loading {name}...',
  'video.close': 'Close (Esc)',
  'video.err_transport': 'Transport not connected',

  // Settings
  'settings.title': 'Settings',
  'settings.coming_soon': 'Coming soon.',
  'settings.profile': 'Profile',
  'settings.username': 'Username',
  'settings.appearance': 'Appearance',
  'settings.theme': 'Theme',
  'settings.theme_light': 'Light',
  'settings.theme_dark': 'Dark',
  'settings.theme_system': 'System',
  'settings.language': 'Language',
  'settings.about': 'About',
  'settings.version': 'Version',
  'settings.protocol': 'Protocol',

  // Sidebar
  'sidebar.settings': 'Settings',
  'sidebar.admin': 'Admin',

  // Admin panel
  'admin.title': 'Administration',
  'admin.tab_stats': 'Stats',
  'admin.tab_users': 'Users',
  'admin.tab_groups': 'Groups',
  'admin.tab_logs': 'Logs',
  'admin.tab_blocklist': 'Blocklist',

  // Admin stats
  'admin.stat_users': 'Users',
  'admin.stat_groups': 'Groups',
  'admin.stat_nodes': 'Nodes',
  'admin.stat_online': 'Online Nodes',

  // Admin users
  'admin.users_search': 'Search users...',
  'admin.col_username': 'Username',
  'admin.col_role': 'Role',
  'admin.col_status': 'Status',
  'admin.col_created': 'Created',
  'admin.col_actions': 'Actions',
  'admin.col_email': 'Email',
  'admin.col_groups': 'Groups',
  'admin.no_users': 'No users found',
  'admin.btn_suspend': 'Suspend',
  'admin.btn_unsuspend': 'Unsuspend',
  'admin.btn_details': 'Details',
  'admin.user_detail': 'User details',
  'admin.btn_close': 'Close',
  'admin.self_note': '(you)',

  // Admin groups
  'admin.col_name': 'Name',
  'admin.col_visibility': 'Visibility',
  'admin.col_members': 'Members',
  'admin.no_groups': 'No groups found',

  // Admin logs
  'admin.col_time': 'Time',
  'admin.col_event': 'Event',
  'admin.col_user': 'User',
  'admin.col_ip': 'IP',
  'admin.col_detail': 'Detail',
  'admin.filter_all': 'All events',
  'admin.no_logs': 'No logs found',
  'admin.btn_load_more': 'Load more',

  // Admin blocklist
  'admin.col_hash': 'Hash',
  'admin.col_reason': 'Reason',
  'admin.col_date': 'Date',
  'admin.col_added_by': 'Added by',
  'admin.no_blocked': 'No blocked hashes',
  'admin.add_hash': 'Add hash to blocklist',
  'admin.hash_placeholder': 'blake3 hash (64 hex chars)',
  'admin.reason_placeholder': 'Reason',
  'admin.btn_block': 'Block',
  'admin.btn_unblock': 'Unblock',
};

// ── Locale registry ─────────────────────────────────────────────────────────

const _strings = { en };
let _locale = 'en';

export const LOCALES = [
  { code: 'en', name: 'English' },
];

export function getLocale() { return _locale; }

export function setLocale(code) {
  if (_strings[code]) {
    _locale = code;
    localStorage.setItem(LANG_KEY, code);
    return true;
  }
  return false;
}

export function addLocale(code, strings) {
  _strings[code] = strings;
}

export function t(key, params) {
  let s = (_strings[_locale] && _strings[_locale][key])
    || _strings.en[key]
    || key;
  if (params) {
    for (const [k, v] of Object.entries(params)) {
      s = s.replace(`{${k}}`, v);
    }
  }
  return s;
}

// ── Init ────────────────────────────────────────────────────────────────────

function _init() {
  const stored = localStorage.getItem(LANG_KEY);
  if (stored && _strings[stored]) {
    _locale = stored;
    return;
  }
  const browserLang = (navigator.language || '').split('-')[0];
  if (_strings[browserLang]) {
    _locale = browserLang;
  }
}

_init();