<?php
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

/**
 * Form editable select element
 *
 * Element allows inline modification of textual data within select
 *
 * @author     Magento Core Team <core@magentocommerce.com>
 */
namespace Magento\Framework\Data\Form\Element;

class Editablemultiselect extends \Magento\Framework\Data\Form\Element\Multiselect
{
    /**
     * Name of the default JavaScript class that is used to make multiselect editable
     *
     * This class must define init() method and receive configuration in the constructor
     */
    const DEFAULT_ELEMENT_JS_CLASS = 'EditableMultiselect';

    /**
     * Retrieve HTML markup of the element
     *
     * @return string
     */
    public function getElementHtml()
    {
        $html = parent::getElementHtml();

        $selectConfig = $this->getData('select_config');
        if ($this->getData('disabled')) {
            $selectConfig['is_entity_editable'] = false;
        }

        $elementJsClass = self::DEFAULT_ELEMENT_JS_CLASS;
        if ($this->getData('element_js_class')) {
            $elementJsClass = $this->getData('element_js_class');
        }

        $selectConfigJson = \Zend_Json::encode($selectConfig);
        $jsObjectName = $this->getJsObjectName();

        // TODO: TaxRateEditableMultiselect should be moved to a static .js module.
        $html .= "
                <script type='text/javascript'>
                require([
                    'jquery',
                    'jquery/ui'
                ], function( $ ){

                    function isResolved(){
                        return typeof window['{$elementJsClass}'] !== 'undefined';
                    }

                    function init(){
                        var {$jsObjectName} = new {$elementJsClass}({$selectConfigJson});

                        {$jsObjectName}.init();
                    }

                    function check( tries, delay ){
                        if( isResolved() ){
                            init();
                        }
                        else if( tries-- ){
                            setTimeout( check.bind(this, tries, delay), delay);
                        }
                        else{
                            console.warn( 'Unable to resolve dependency: {$elementJsClass}' );
                        }
                    }

                   check(8, 500);

                });
                </script>";
        return $html;
    }

    /**
     * Retrieve HTML markup of given select option
     *
     * @param array $option
     * @param string[] $selected
     * @return string
     */
    protected function _optionToHtml($option, $selected)
    {
        $html = '<option value="' . $this->_escape($option['value']) . '"';
        $html .= isset($option['title']) ? 'title="' . $this->_escape($option['title']) . '"' : '';
        $html .= isset($option['style']) ? 'style="' . $option['style'] . '"' : '';
        if (in_array((string)$option['value'], $selected)) {
            $html .= ' selected="selected"';
        }

        if ($this->getData('disabled')) {
            // if element is disabled then no data modification is allowed
            $html .= ' disabled="disabled" data-is-removable="no" data-is-editable="no"';
        }

        $html .= '>' . $this->_escape($option['label']) . '</option>' . "\n";
        return $html;
    }
}
