<?php
/**
 * Shortcodes generator initializator.
 */
class WPZOOM_Shortcodes_Init {
    public function __construct() {
        // Register the necessary actions on `admin_init`.
        add_action( 'admin_init', array( &$this, 'init' ) );

        // `wp_ajax_*` is only run for logged users.
        add_action( 'wp_ajax_wpz_check_url_action', array( &$this, 'ajax_action_check_url' ) );
    }

    public function init() {
        if ( ( current_user_can( 'edit_posts' ) || current_user_can( 'edit_pages' ) ) && get_user_option( 'rich_editing') == 'true' )  {
            // Add the tinyMCE buttons and plugins.
            add_filter( 'mce_buttons', array( &$this, 'filter_mce_buttons' ) );
            add_filter( 'mce_external_plugins', array( &$this, 'filter_mce_external_plugins' ) );

            // Register Shortcodes dialog for AJAX requests.
            add_action( 'wp_ajax_zoom_shortcodes_ajax_dialog', array( $this, 'ajax_dialog' ) );

            // Register Shortcodes preview frame for AJAX requests.
            add_action( 'wp_ajax_zoom_shortcodes_ajax_preview', array( $this, 'ajax_preview' ) );

            // Register the colourpicker JavaScript.
            wp_register_script( 'wpz-colourpicker', WPZOOM::$assetsPath . '/js/colorpicker.js', array( 'jquery' ), '3.6', true ); // Loaded into the footer.
            wp_enqueue_script( 'wpz-colourpicker' );

            // Register the colourpicker CSS.
            wp_register_style( 'wpz-colourpicker', WPZOOM::$assetsPath . '/css/colorpicker.css' );
            wp_enqueue_style( 'wpz-colourpicker' );

            // Register the custom CSS styles.
            wp_register_style( 'wpz-shortcode-generator', WPZOOM::$assetsPath . '/css/shortcode-generator.css' );
            wp_enqueue_style( 'wpz-shortcode-generator' );

            wp_enqueue_style( 'zoom-font-awesome', WPZOOM::$assetsPath . '/css/font-awesome.min.css' );
        }
    }

    /**
     * Shortcodes preview for dialog window.
     */
    public function ajax_preview() {
        require_once dirname(__FILE__) . '/dialog-preview-shortcode.php';
        die();
    }

    /**
     * Shortcodes dialog window.
     */
    public function ajax_dialog() {
        require_once dirname(__FILE__) . '/dialog.php';
        die();
    }

    /**
     * Add new button to the tinyMCE editor.
     */
    public function filter_mce_buttons( $buttons ) {
        array_push( $buttons, '|', 'wpzoom_shortcodes_button' );

        return $buttons;
    }

    /**
     * Add functionality to the tinyMCE editor as an external plugin.
     */
    public function filter_mce_external_plugins( $plugins ) {
        global $wp_version;
        $suffix = '';

        if ( version_compare( $wp_version, '3.9', '<' ) ) {
            $suffix = '.3.8';
        }

        $plugins['wpzoomShortcodes'] = WPZOOM::$assetsPath . '/js/shortcode-generator/editor-plugin' . $suffix . '.js';

        return $plugins;
    }

    /**
     * Checks if a given url (via GET or POST) exists.
     * Returns JSON.
     *
     * NOTE: For users that are not logged in this is not called.
     * The client recieves <code>-1</code> in that case.
     */
    public function ajax_action_check_url() {
        $hadError = true;

        $url = isset( $_REQUEST['url'] ) ? $_REQUEST['url'] : '';

        if ( strlen( $url ) > 0  && function_exists( 'get_headers' ) ) {
          $file_headers = @get_headers( $url );
          $exists       = $file_headers && $file_headers[0] != 'HTTP/1.1 404 Not Found';
          $hadError     = false;
        }

        echo '{ "exists": '. ($exists ? '1' : '0') . ($hadError ? ', "error" : 1 ' : '') . ' }';

        die();
    }
}

/**
 * Fire ZOOM Shortcode Generator.
 */
$zoom_shortcode_generator = new WPZOOM_Shortcodes_Init();