<?php
class vinotjs_panel_shortcode{
    /**
     * $shortcode_tag
     * holds the name of the shortcode tag
     * @var string
     */
    public $shortcode_tag = 'vinotjs';

    /**
     * __construct
     * class constructor will set the needed filter and action hooks
     *
     * @param array $args
     */
    function __construct($args = array()){
        if (is_admin()){
            add_action('admin_head', array($this, 'admin_head'));
            add_action('admin_enqueue_scripts', array($this , 'admin_enqueue_scripts'));
        }
    }

    /**
     * admin_head
     * calls your functions into the correct filters
     * @return void
     */
    function admin_head(){
        // check user permissions
        if (!current_user_can('edit_posts') && !current_user_can('edit_pages')){
            return;
        }

        // check if WYSIWYG is enabled
        if ('true' == get_user_option('rich_editing')){
            add_filter('mce_external_plugins', array($this ,'mce_external_plugins'));
            add_filter('mce_buttons', array($this, 'mce_buttons'));
        }
    }

    /**
     * mce_external_plugins
     * Adds our tinymce plugin
     * @param  array $plugin_array
     * @return array
     */
    function mce_external_plugins($plugin_array){
        $plugin_array[$this->shortcode_tag] = get_bloginfo('template_url') . '/js/mce-button.js';
        return $plugin_array;
    }

    /**
     * mce_buttons
     * Adds our tinymce button
     * @param  array $buttons
     * @return array
     */
    function mce_buttons($buttons){
        array_push($buttons, $this->shortcode_tag);
        return $buttons;
    }

    /**
     * admin_enqueue_scripts
     * Used to enqueue custom styles
     * @return void
     */
    function admin_enqueue_scripts(){
        wp_enqueue_style('vinotjs_shortcode', get_bloginfo('template_url') . '/css/mce-button.css');
    }
}