<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\apidoc\templates\bootstrap;

use Yii;
use yii\base\InvalidConfigException;
use yii\bootstrap\BootstrapAsset;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;

/**
 * Nav renders a nav HTML component.
 *
 * For example:
 *
 * ```php
 * echo Nav::widget([
 *     'items' => [
 *         [
 *             'label' => 'Home',
 *             'url' => ['site/index'],
 *             'linkOptions' => [...],
 *         ],
 *         [
 *             'label' => 'Dropdown',
 *             'items' => [
 *                  ['label' => 'Level 1 - Dropdown A', 'url' => '#'],
 *                  '<li class="divider"></li>',
 *                  '<li class="dropdown-header">Dropdown Header</li>',
 *                  ['label' => 'Level 1 - Dropdown B', 'url' => '#'],
 *             ],
 *         ],
 *     ],
 * ]);
 * ```
 *
 * Note: Multilevel dropdowns beyond Level 1 are not supported in Bootstrap 3.
 *
 * @see http://getbootstrap.com/components.html#dropdowns
 * @see http://getbootstrap.com/components/#nav
 *
 * @author Antonio Ramirez <amigo.cobos@gmail.com>
 * @since 2.0
 */
class SideNavWidget extends \yii\bootstrap\Widget
{
	/**
	 * @var array list of items in the nav widget. Each array element represents a single
	 * menu item which can be either a string or an array with the following structure:
	 *
	 * - label: string, required, the nav item label.
	 * - url: optional, the item's URL. Defaults to "#".
	 * - visible: boolean, optional, whether this menu item is visible. Defaults to true.
	 * - linkOptions: array, optional, the HTML attributes of the item's link.
	 * - options: array, optional, the HTML attributes of the item container (LI).
	 * - active: boolean, optional, whether the item should be on active state or not.
	 * - items: array|string, optional, the configuration array for creating a [[Dropdown]] widget,
	 *   or a string representing the dropdown menu. Note that Bootstrap does not support sub-dropdown menus.
	 *
	 * If a menu item is a string, it will be rendered directly without HTML encoding.
	 */
	public $items = [];
	/**
	 * @var boolean whether the nav items labels should be HTML-encoded.
	 */
	public $encodeLabels = true;
	/**
	 * @var string the route used to determine if a menu item is active or not.
	 * If not set, it will use the route of the current request.
	 * @see params
	 * @see isItemActive
	 */
	public $activeUrl;


	/**
	 * Initializes the widget.
	 */
	public function init()
	{
		parent::init();
		if (!isset($this->options['class'])) {
			Html::addCssClass($this->options, 'list-group');
		}
	}

	/**
	 * Renders the widget.
	 */
	public function run()
	{
		echo $this->renderItems();
		BootstrapAsset::register($this->getView());
	}

	/**
	 * Renders widget items.
	 */
	public function renderItems()
	{
		$items = [];
		foreach ($this->items as $i => $item) {
			if (isset($item['visible']) && !$item['visible']) {
				unset($items[$i]);
				continue;
			}
			$items[] = $this->renderItem($item);
		}

		return Html::tag('div', implode("\n", $items), $this->options);
	}

	/**
	 * Renders a widget's item.
	 * @param string|array $item the item to render.
	 * @return string the rendering result.
	 * @throws InvalidConfigException
	 */
	public function renderItem($item)
	{
		if (is_string($item)) {
			return $item;
		}
		if (!isset($item['label'])) {
			throw new InvalidConfigException("The 'label' option is required.");
		}

		$label = $this->encodeLabels ? Html::encode($item['label']) : $item['label'];
//		$options = ArrayHelper::getValue($item, 'options', []);
		$items = ArrayHelper::getValue($item, 'items');
		$url = Html::url(ArrayHelper::getValue($item, 'url', '#'));
		$linkOptions = ArrayHelper::getValue($item, 'linkOptions', []);
		Html::addCssClass($linkOptions, 'list-group-item');

		if (isset($item['active'])) {
			$active = ArrayHelper::remove($item, 'active', false);
		} else {
			$active = ($url == $this->activeUrl);
		}

		if ($items !== null) {
			$linkOptions['data-toggle'] = 'collapse';
			$linkOptions['data-parent'] = '#' . $this->id;
			$id = $this->id . '-' . static::$counter++;
			$url = '#' . $id;
			$label .= ' ' . Html::tag('b', '', ['class' => 'caret']);
			if (is_array($items)) {
				if ($active === false) {
					foreach($items as $subItem) {
						if (isset($subItem['active']) && $subItem['active']) {
							$active = true;
						}
					}
				}
				$items = static::widget([
					'id' => $id,
					'items' => $items,
					'encodeLabels' => $this->encodeLabels,
					'view' => $this->getView(),
					'options' => [
						'class' => "submenu panel-collapse collapse" . ($active ? ' in' : '')
					]
				]);
			}
		}

		if ($active) {
			Html::addCssClass($linkOptions, 'active');
		}

		return Html::a($label, $url, $linkOptions) . $items;
	}
}
