import { createDropdownMenu } from './dropdown-menu.js';

function appendNode(target, node) {
  if (!target || !(node instanceof Node)) return;
  target.append(node);
}

function createActionButton(action = {}, cleanupFns) {
  const button = document.createElement('button');
  button.type = 'button';
  button.className = `icon-btn topbar__action${action.className ? ` ${action.className}` : ''}`;
  if (action.title) button.title = action.title;
  if (action.ariaLabel) button.setAttribute('aria-label', action.ariaLabel);
  if (action.id) button.dataset.action = action.id;

  if (action.iconNode instanceof Node) {
    button.append(action.iconNode);
  } else {
    button.textContent = String(action.label ?? '');
  }

  if (action.menu) {
    const menu = createDropdownMenu({
      anchorEl: button,
      transparent: true,
      dimBackground: true,
      keepAnchorPressed: true,
      ...(typeof action.menu === 'object' ? action.menu : {}),
    });
    cleanupFns.add(() => menu.destroy());
  } else if (typeof action.onClick === 'function') {
    button.addEventListener('click', action.onClick);
  }

  return button;
}

export function createTopBar({
  title = '',
  className = '',
  left = null,
  center = null,
  back = null,
  leftLabel = '',
  actions = [],
} = {}) {
  const cleanupFns = new Set();
  const topbar = document.createElement('header');
  topbar.className = `topbar${className ? ` ${className}` : ''}`;

  const leftSlot = document.createElement('div');
  leftSlot.className = 'topbar__left';

  const backAction = back;
  if (backAction?.visible !== false && typeof backAction?.onClick === 'function') {
    const button = document.createElement('button');
    button.type = 'button';
    button.className = `icon-btn topbar__back${backAction.className ? ` ${backAction.className}` : ''}`;
    button.textContent = '←';
    button.setAttribute('aria-label', backAction.ariaLabel || 'Назад');
    button.title = backAction.title || 'Назад';
    button.addEventListener('click', backAction.onClick);
    leftSlot.append(button);
  }

  appendNode(leftSlot, left);

  if (leftLabel) {
    const label = document.createElement('span');
    label.className = 'topbar__left-label';
    label.textContent = leftLabel;
    leftSlot.append(label);
  }

  const centerSlot = document.createElement('div');
  centerSlot.className = 'topbar__center';
  const resolvedCenter = center;
  if (resolvedCenter instanceof Node) {
    centerSlot.append(resolvedCenter);
  } else {
    const heading = document.createElement('h1');
    heading.className = 'topbar__title';
    heading.textContent = String(title || '');
    centerSlot.append(heading);
  }

  const rightSlot = document.createElement('div');
  rightSlot.className = 'topbar__right';
  const normalizedActions = actions;
  normalizedActions.forEach((action) => {
    rightSlot.append(createActionButton(action, cleanupFns));
  });

  topbar.append(leftSlot, centerSlot, rightSlot);

  topbar.addCleanup = (cleanup) => {
    if (typeof cleanup === 'function') cleanupFns.add(cleanup);
    return cleanup;
  };
  topbar.cleanup = () => {
    for (const cleanup of cleanupFns) {
      try {
        cleanup();
      } catch (error) {
        console.warn('[TopBar] cleanup failed', error);
      }
    }
    cleanupFns.clear();
  };

  return topbar;
}