<?php
/*
Plugin Name: Black Studio TinyMCE Widget
Plugin URI: https://wordpress.org/plugins/black-studio-tinymce-widget/
Description: Adds a new "Visual Editor" widget type based on the native WordPress TinyMCE editor.
Version: 2.3.1
Author: Black Studio
Author URI: http://www.blackstudio.it
Requires at least: 3.1
Tested up to: 4.6
License: GPLv3
Text Domain: black-studio-tinymce-widget
Domain Path: /languages
*/

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Main plugin class
 *
 * @package Black_Studio_TinyMCE_Widget
 * @since 2.0.0
 */

if ( ! class_exists( 'Black_Studio_TinyMCE_Plugin' ) ) {

	final class Black_Studio_TinyMCE_Plugin {

		/**
		 * Plugin version
		 *
		 * @var string
		 * @since 2.0.0
		 */
		public static $version = '2.3.1';

		/**
		 * The single instance of the plugin class
		 *
		 * @var object
		 * @since 2.0.0
		 */
		protected static $_instance = null;

		/**
		 * Instance of admin class
		 *
		 * @var object
		 * @since 2.0.0
		 */
		protected static $admin = null;

		/**
		 * Instance of admin pointer class
		 *
		 * @var object
		 * @since 2.1.0
		 */
		protected static $admin_pointer = null;

		/**
		 * Instance of compatibility class
		 *
		 * @var object
		 * @since 2.0.0
		 */
		protected static $compatibility = null;

		/**
		 * Instance of the text filters class
		 *
		 * @var object
		 * @since 2.0.0
		 */
		protected static $text_filters = null;

		/**
		 * Return the main plugin instance
		 *
		 * @return object
		 * @since 2.0.0
		 */
		public static function instance() {
			if ( is_null( self::$_instance ) ) {
				self::$_instance = new self();
			}
			return self::$_instance;
		}

		/**
		 * Return the instance of the admin class
		 *
		 * @return object
		 * @since 2.0.0
		 */
		public static function admin() {
			return self::$admin;
		}

		/**
		 * Return the instance of the admin pointer class
		 *
		 * @return object
		 * @since 2.1.0
		 */
		public static function admin_pointer() {
			return self::$admin_pointer;
		}

		/**
		 * Return the instance of the compatibility class
		 *
		 * @return object
		 * @since 2.0.0
		 */
		public static function compatibility() {
			return self::$compatibility;
		}

		/**
		 * Return the instance of the text filters class
		 *
		 * @return object
		 * @since 2.0.0
		 */
		public static function text_filters() {
			return self::$text_filters;
		}

		/**
		 * Get plugin version
		 *
		 * @return string
		 * @since 2.0.0
		 */
		public static function get_version() {
			return self::$version;
		}

		/**
		 * Get plugin basename
		 *
		 * @uses plugin_basename()
		 *
		 * @return string
		 * @since 2.0.0
		 */
		public static function get_basename() {
			return plugin_basename( __FILE__ );
		}

		/**
		 * Class constructor
		 *
		 * @uses add_action()
		 * @uses add_filter()
		 * @uses get_option()
		 * @uses get_bloginfo()
		 *
		 * @global object $wp_embed
		 * @since 2.0.0
		 */
		protected function __construct() {
			// Include required files
			include_once( plugin_dir_path( __FILE__ ) . 'includes/class-widget.php' );
			// Include and instantiate admin class on admin pages
			if ( is_admin() ) {
				include_once( plugin_dir_path( __FILE__ ) . 'includes/class-admin.php' );
				self::$admin = Black_Studio_TinyMCE_Admin::instance();
				include_once( plugin_dir_path( __FILE__ ) . 'includes/class-admin-pointer.php' );
				self::$admin_pointer = Black_Studio_TinyMCE_Admin_Pointer::instance();
			}
			// Include and instantiate text filter class on frontend pages
			else {
				include_once( plugin_dir_path( __FILE__ ) . 'includes/class-text-filters.php' );
				self::$text_filters = Black_Studio_TinyMCE_Text_Filters::instance();
			}
			// Register action and filter hooks
			add_action( 'plugins_loaded', array( $this, 'load_compatibility' ), 50 );
			add_action( 'widgets_init', array( $this, 'widgets_init' ) );
		}

		/**
		 * Prevent the class from being cloned
		 *
		 * @return void
		 * @since 2.0.0
		 */
		protected function __clone() {
			_doing_it_wrong( __FUNCTION__, __( 'Cheatin&#8217; uh?' ), '2.0' );
		}

		/**
		 * Load compatibility class
		 *
		 * @uses apply_filters()
		 * @uses get_bloginfo()
		 * @uses plugin_dir_path()
		 *
		 * @return void
		 * @since 2.0.0
		 */
		public function load_compatibility() {
			// Compatibility load flag (for both deprecated functions and code for compatibility with other plugins)
			$load_compatibility = apply_filters( 'black_studio_tinymce_load_compatibility', true );
			if ( $load_compatibility ) {
				include_once( plugin_dir_path( __FILE__ ) . 'includes/class-compatibility.php' );
				self::$compatibility = Black_Studio_TinyMCE_Compatibility::instance();
			}
		}

		/**
		 * Widget initialization
		 *
		 * @uses is_blog_installed()
		 * @uses register_widget()
		 *
		 * @return null|void
		 * @since 2.0.0
		 */
		public function widgets_init() {
			if ( ! is_blog_installed() ) {
				return;
			}
			register_widget( 'WP_Widget_Black_Studio_TinyMCE' );
		}

		/**
		 * Check if a widget is a Black Studio Tinyme Widget instance
		 *
		 * @param object $widget
		 * @return boolean
		 * @since 2.0.0
		 */
		public function check_widget( $widget ) {
			return 'object' == gettype( $widget ) && ( 'WP_Widget_Black_Studio_TinyMCE' == get_class( $widget ) || is_subclass_of( $widget , 'WP_Widget_Black_Studio_TinyMCE' ) );
		}

	} // END class Black_Studio_TinyMCE_Plugin

} // END class_exists check


if ( ! function_exists( 'bstw' ) ) {

	/**
	 * Return the main instance to prevent the need to use globals
	 *
	 * @return object
	 * @since 2.0.0
	 */
	function bstw() {
		return Black_Studio_TinyMCE_Plugin::instance();
	}

	/* Create the main instance */
	bstw();

} // END function_exists bstw check
else {

	/* Check for multiple plugin instances */
	if ( ! function_exists( 'bstw_multiple_notice' ) ) {

		/**
		 * Show admin notice when multiple instances of the plugin are detected
		 *
		 * @return void
		 * @since 2.1.0
		 */
		function bstw_multiple_notice() {
			global $pagenow;
			if ( 'widgets.php' == $pagenow ) {
				echo '<div class="error">';
				/* translators: error message shown when multiple instance of the plugin are detected */
				echo '<p>' . esc_html( __( 'ERROR: Multiple instances of the Black Studio TinyMCE Widget plugin were detected. Please activate only one instance at a time.', 'black-studio-tinymce-widget' ) ) . '</p>';
				echo '</div>';
			}
		}
		add_action( 'admin_notices', 'bstw_multiple_notice' );

	} // END function_exists bstw_multiple_notice check

} // END else function_exists bstw check
