// Writes a JSON payload into the hidden Gradio textbox so Python sees it via .change()
function bridgeSend(eventType, payload) {
  const el = document.querySelector('#bridge_input textarea');
  if (!el) return;
  const data = JSON.stringify({ type: eventType, ts: Date.now(), ...(payload || {}) });
  // React-compatible value setter so Gradio's synthetic event fires
  const setter = Object.getOwnPropertyDescriptor(window.HTMLTextAreaElement.prototype, 'value').set;
  setter.call(el, data);
  el.dispatchEvent(new Event('input', { bubbles: true }));
}

// ── Todo event delegation (onclick stripped by Gradio HTML sanitizer) ─────────
document.addEventListener('click', function (e) {
  const el = e.target.closest('[data-action]');
  if (!el) return;
  const action = el.dataset.action;
  const id = parseInt(el.dataset.id, 10);
  if (!action || isNaN(id)) return;
  bridgeSend(action, { id });
  if (action === 'remove_todo')   _removeTodoFromStorage(id);
});

document.addEventListener('change', function (e) {
  const el = e.target.closest('[data-action]');
  if (!el) return;
  const action = el.dataset.action;
  const id = parseInt(el.dataset.id, 10);
  if (!action || isNaN(id)) return;
  bridgeSend(action, { id });
  if (action === 'complete_todo') {
    _toggleTodoDoneInStorage(id);
    if (el.checked && window.avatarPlay) window.avatarPlay('celebrate');
  }
});

// ── Python → JS command channel ───────────────────────────────────────────────
// Called by Gradio's .then(fn=None, js=...) after each chat response.
// cmd is a JS expression string returned by Python (e.g. "timerStart(25,'pomodoro')").
function runPyCmd(cmd) {
  if (!cmd) return;
  try { eval(cmd); } catch (e) { console.error('[py_cmd]', e); }
}

// ── Todo localStorage sync ────────────────────────────────────────────────────
const _TODOS_LS_KEY = 'focus_buddy_todos';

function _escTodo(s) {
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

function _parseTodosFromDOM() {
  const todos = [];
  document.querySelectorAll('.todo-item[id^="todo-"]').forEach(el => {
    const id       = parseInt(el.id.replace('todo-', ''), 10);
    const checkbox = el.querySelector('.todo-check');
    const span     = el.querySelector('.todo-task');
    if (span && !isNaN(id)) {
      todos.push({ id, task: span.textContent.trim(), done: checkbox?.checked || false });
    }
  });
  return todos;
}

function _saveTodosToStorage() {
  try {
    localStorage.setItem(_TODOS_LS_KEY, JSON.stringify(_parseTodosFromDOM()));
  } catch (_) {}
}

function _removeTodoFromStorage(id) {
  try {
    const saved = JSON.parse(localStorage.getItem(_TODOS_LS_KEY) || '[]');
    localStorage.setItem(_TODOS_LS_KEY, JSON.stringify(saved.filter(t => t.id !== id)));
  } catch (_) {}
}

function _toggleTodoDoneInStorage(id) {
  try {
    const saved = JSON.parse(localStorage.getItem(_TODOS_LS_KEY) || '[]');
    localStorage.setItem(_TODOS_LS_KEY, JSON.stringify(
      saved.map(t => t.id === id ? { ...t, done: !t.done } : t)
    ));
  } catch (_) {}
}

function _buildTodoHTML(todos) {
  const sorted = todos;
  const items = sorted.map(t => {
    const checked = t.done ? 'checked' : '';
    const doneCls = t.done ? ' todo-done' : '';
    return `<div class="todo-item" id="todo-${t.id}">` +
      `<input type="checkbox" ${checked} class="todo-check" data-action="complete_todo" data-id="${t.id}">` +
      `<span class="todo-task${doneCls}">${_escTodo(t.task)}</span>` +
      `<button class="todo-del" data-action="remove_todo" data-id="${t.id}">✕</button>` +
      `</div>`;
  }).join('');
  return `<div class="todo-panel" id="todo-panel">` +
    `<h3 class="panel-title">📋 Quests</h3>` +
    `<div class="todo-list">${items}</div>` +
    `</div>`;
}

function _loadTodosFromStorage() {
  try {
    const saved = JSON.parse(localStorage.getItem(_TODOS_LS_KEY) || 'null');
    if (!saved || saved.length === 0) return;

    // Only inject if the server rendered no todos (avoids stomping server state)
    const existing = document.querySelectorAll('.todo-item[id^="todo-"]');
    if (existing.length > 0) return;

    const panel = document.getElementById('todo-panel');
    if (!panel) return;
    panel.outerHTML = _buildTodoHTML(saved);
  } catch (_) {}
}

function _initTodosStorage() {
  const panel = document.getElementById('todo-panel');
  if (!panel) {
    setTimeout(_initTodosStorage, 300);
    return;
  }

  // Restore from localStorage if server rendered an empty list
  _loadTodosFromStorage();

  // Watch for Python re-renders and keep localStorage in sync
  const watchTarget = panel.closest('[data-testid]') || panel.parentElement;
  new MutationObserver(_saveTodosToStorage).observe(watchTarget, { childList: true, subtree: true });
}

setTimeout(_initTodosStorage, 500);

// ── Inventory / Chat panel toggle ─────────────────────────────────────────────
function showPanel(which) {
  const isInv = which === 'inv';
  const invWrap  = document.getElementById('inventory-panel-wrap');
  const chatWrap = document.getElementById('chatbot-wrap');
  const inputWrap = document.getElementById('chat-input-wrap');
  if (invWrap)   invWrap.style.display   = isInv ? '' : 'none';
  if (chatWrap)  chatWrap.style.display  = isInv ? 'none' : '';
  if (inputWrap) inputWrap.style.display = isInv ? 'none' : '';
  document.querySelectorAll('.panel-tab').forEach(btn => {
    btn.classList.toggle('active', btn.dataset.panel === which);
  });
}

function _initPanelToggle() {
  const invWrap = document.getElementById('inventory-panel-wrap');
  if (!invWrap) { setTimeout(_initPanelToggle, 300); return; }
  invWrap.style.display = 'none';
}
setTimeout(_initPanelToggle, 400);