'use strict';

// ---------------------------------------------------------------------------
// Tabs
// ---------------------------------------------------------------------------

const TOP_TABS = ['home', 'radio', 'focus', 'podcasts', 'books', 'feeds', 'ambient', 'audiobooks', 'sources', 'suche', 'projekte'];
const RADIO_SUB_TABS = ['search', 'saved', 'history'];

// ---------------------------------------------------------------------------
// URL hash routing — makes tabs deep-linkable/shareable and lets the browser
// back/forward buttons move between them. Deliberately hash-based rather
// than real paths: /podcasts/ and /books/ etc. are already taken by the
// JSON API, so this avoids touching Django's urls.py at all.
// ---------------------------------------------------------------------------
let _routingFromHash = false;
let _currentTopTab = 'radio';

function _syncHash() {
  if (_routingFromHash || window.DioraNav) return;   // the navigation keeps the hash (static/js/nav.js)
  let hash = _currentTopTab;
  if (_currentTopTab === 'radio') {
    hash += '/' + (localStorage.getItem('diora_active_radio_tab') || 'saved');
  }
  if (location.hash.slice(1) !== hash) history.pushState(null, '', '#' + hash);
}

function _routeFromHash() {
  if (window.DioraNav) return;   // nav.js routes (#news, #audiobooks …)
  const [tab, sub] = (location.hash || '').replace(/^#/, '').split('/').filter(Boolean);
  if (!TOP_TABS.includes(tab)) return;
  _routingFromHash = true;
  try {
    showTab(tab);
    if (tab === 'radio' && RADIO_SUB_TABS.includes(sub)) showRadioTab(sub);
  } finally {
    _routingFromHash = false;
  }
}

window.addEventListener('popstate', _routeFromHash);
window.addEventListener('hashchange', _routeFromHash);

function showOfflineBanner(offline) {
  document.body.classList.toggle('app-offline', offline);
  const uploadArea = $('book-upload-area');
  if (uploadArea) uploadArea.style.display = offline ? 'none' : '';
}

function showTab(name) {
  TOP_TABS.forEach(p => {
    const panel = $(`tab-${p}`);
    if (panel) panel.style.display = (p === name) ? '' : 'none';
  });

  if (!window.DioraNav) {   // else nav.js marks its own buttons
    document.querySelectorAll('#tabs .tab-btn').forEach((btn, i) => {
      btn.classList.toggle('active', TOP_TABS[i] === name);
    });
  }

  localStorage.setItem('diora_active_tab', name);
  _currentTopTab = name;
  _syncHash();

  if (name === 'books') loadBookList();
  if (name === 'ambient') _ambientLoad();
  if (name === 'home' && window.__dioraHomeShow) window.__dioraHomeShow();   // static/js/home.js
  if (name === 'feeds' && window.__dioraFeedsShow) window.__dioraFeedsShow(); // static/js/feeds.js
}