// ObsiGate — Floating Action Button (FAB) to open/close the BooksLM AI sidebar.
// Always visible in the bottom-right corner; hides while BooksLM is open.
import booksLM from './bookslm.js';
import { state } from './state.js';
import { showToast, TabManager } from './ui.js';
import { t } from './i18n.js';
import { safeCreateIcons } from './utils.js';

let _fab = null;

// Mirror palette.js getCurrentFile(): prefer the active tab, then fall back to state.
function getCurrentFile() {
  const id = TabManager._activeTabId;
  if (id) {
    const tab = TabManager._tabs.find((x) => x.id === id);
    if (tab) return { vault: tab.vault, path: tab.path };
  }
  if (state.currentVault && state.currentPath) return { vault: state.currentVault, path: state.currentPath };
  return null;
}

// The BooksLM panel is considered visible when it has `.open` without `.hidden`
// (the header toggle collapses it off-screen via `.hidden`).
function isBooksLmVisible() {
  const panel = document.querySelector('.bookslm-panel');
  return !!(panel && panel.classList.contains('open') && !panel.classList.contains('hidden'));
}

function syncVisibility() {
  if (!_fab) return;
  const visible = isBooksLmVisible();
  _fab.hidden = visible;
  const label = visible ? t('fab.close') : t('fab.open');
  _fab.title = label;
  _fab.setAttribute('aria-label', label);
}

async function onClick() {
  const f = getCurrentFile();
  if (!f) {
    showToast(t('toast.no_open_file'), 'error');
    return;
  }

  const sameDir = booksLM._isOpen && booksLM._vault === f.vault && booksLM._directory === f.path;
  if (sameDir) {
    // Already open for this directory: re-show a collapsed panel, or close it.
    const panel = document.querySelector('.bookslm-panel');
    if (panel && panel.classList.contains('hidden')) {
      booksLM._toggleSidebar();
    } else {
      booksLM.close();
    }
    return;
  }

  await booksLM.open(f.vault, f.path);
}

export function initAIFab() {
  if (_fab) return;

  const btn = document.createElement('button');
  btn.type = 'button';
  btn.id = 'ai-fab';
  btn.className = 'ai-fab';
  btn.innerHTML = '<i data-lucide="bot" style="width:24px;height:24px"></i>';
  document.body.appendChild(btn);
  _fab = btn;

  btn.addEventListener('click', onClick);
  document.addEventListener('bookslm:opened', syncVisibility);
  document.addEventListener('bookslm:closed', syncVisibility);

  if (typeof safeCreateIcons === 'function') safeCreateIcons();
  syncVisibility();
}

export default initAIFab;