/**
 * 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': 'Passphrase (min 12 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': 'Use at least {n} characters',
  'register.err_too_weak': 'Too easy to guess. Your passphrase is what protects '
    + 'your keys where they are stored — a few unrelated words work well.',
  'register.strength': 'Strength: about {bits} bits. This protects the copy of '
    + 'your keys kept on the nodes you join, so it is worth getting right.',

  // 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.search': 'Search groups...',
  'explore.loading': 'Loading...',
  'explore.empty': 'No public groups available.',
  'explore.create_group': 'Create group',
  'explore.join': 'Join',
  'explore.member': 'Joined',

  // Group page
  'group.default_name': 'Group',
  'group.tab_files': 'Files',
  'group.tab_chat': 'Chat',
  'group.tab_members': 'Members',
  '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.upload': 'Upload',
  'group.uploading': 'Uploading...',
  'group.view': 'View',
  'group.delete': 'Delete',
  'group.delete_confirm': 'Delete {name}?',
  'group.delete_group': 'Delete group',
  'group.delete_group_confirm': 'Permanently delete "{name}" and remove all members? Files on the node are preserved.',
  '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',
  'chat.attach': 'Attach file',

  // Video player
  'video.loading': 'Loading {name}...',
  'video.buffering': 'Buffering...',
  'video.close': 'Close (Esc)',
  'video.err_transport': 'Transport not connected',
  'video.err_mse': 'Codec not supported for streaming: {codec}',

  // Settings
  'settings.title': 'Settings',
  'settings.coming_soon': 'Coming soon.',
  'settings.profile': 'Profile',
  'settings.username': 'Username',
  'settings.node_pins': 'Node identities',
  'settings.node_pins_hint': "Each node's identity key is remembered the first time you connect. If it changes, the connection is refused — that is expected only when an operator reinstalls a node. Verify with them before clearing.",
  'settings.node_pins_count': '{n} pinned',
  'settings.node_pins_clear': 'Clear pinned identities',
  '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',
  'settings.role': 'Role',
  'settings.groups': 'Group notifications',
  'settings.notifications': 'Notifications',
  'settings.node_key': 'Link Node',
  'settings.node_key_desc': 'If you operate a MeshBay node, paste its Ed25519 public key here to link it to your account. You can find this key in your node\'s admin dashboard.',
  'settings.node_key_placeholder': 'Paste node Ed25519 public key (base64)',
  'settings.node_key_submit': 'Link Node',
  'settings.node_key_success': 'Node linked successfully',
  'settings.node_key_current': 'Linked node key',

  // Sidebar
  'sidebar.create_group': 'Create group',
  'sidebar.settings': 'Settings',
  'sidebar.admin': 'Admin',

  // User menu
  'usermenu.language': 'Language',
  'usermenu.settings': 'Settings',
  'usermenu.theme_light': 'Light mode',
  'usermenu.theme_dark': 'Dark mode',
  'usermenu.logout': 'Logout',

  // 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',

  // Notifications
  // Create group
  'create_group.title': 'Create Group',
  'create_group.name': 'Group name',
  'create_group.visibility': 'Visibility',
  'create_group.private': 'Private',
  'create_group.public': 'Public',
  'create_group.join_policy': 'Join policy',
  'create_group.invite': 'Invite only',
  'create_group.open': 'Open (anyone can join)',
  'create_group.description': 'Description',
  'create_group.description_hint': 'What is this group about? (optional)',
  'create_group.submit': 'Create',
  'create_group.hint': 'A group needs a node to host files. You can create the group now and connect a node later.',
  'create_group.creating': 'Creating...',

  // Members
  'members.col_role': 'Role',
  'members.group_role': 'Group role',
  'members.admin': 'Admin',
  'members.group_admin': 'Group admin',
  'members.owner': 'Owner',
  'members.member': 'Member',
  'members.invite_title': 'Invite member',
  'members.username_placeholder': 'Username',
  'members.invite_btn': 'Invite',
  'members.pair_title': 'Pair this browser with your node',
  'members.pair_hint': 'Your node only accepts operator actions — invites, file '
    + 'deletion — from a browser it has been paired with. Run '
    + '`meshbay-node operator pair` on the node and type the code here. The code '
    + 'never passes through the hub, which is what stops the hub from claiming to '
    + 'be you.',
  'members.pair_btn': 'Pair',
  'members.pair_success': 'This browser is now paired with the node.',
  'members.invite_code_ready': 'Invitation code for {user} — send it to them the way '
    + 'you normally talk. It works once, and it never passes through the hub.',
  'members.invite_code_hint': 'They enter it the first time they open this group. '
    + 'You do not need to be online then.',
  'group.join_code_title': 'This node needs to recognise you',
  'group.join_code_hint': 'Ask whoever invited you for the one-time code, and enter '
    + 'it here. After that this browser is recognised and you will not be asked again.',
  'group.join_code_btn': 'Join',

  'notif.title': 'Notifications',
  'notif.empty': 'No notifications',
  'notif.mark_all_read': 'Mark all read',

  // Sidebar
  'sidebar.search': 'Search files',

  // Status
  'status.cached': '{n} cached files',

  // Search
  'search.title': 'Search Files',
  'search.placeholder': 'Search across all groups...',
  'search.no_results': 'No files match your search.',
  'search.col_group': 'Group',
  'search.result_count': '{n} files found',
  'search.hint': 'Search file names across all cached group indexes.',
};

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

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

export const LOCALES = [
  { code: 'en', name: 'English', flag: '\u{1F1EC}\u{1F1E7}' },
];

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();