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<?php
/*
Plugin Name: SiteOrigin CSS
Description: An advanced CSS editor from SiteOrigin.
Version: 1.2.3
Author: SiteOrigin
Author URI: https://siteorigin.com
Plugin URI: https://siteorigin.com/css/
License: GPL3
License URI: https://www.gnu.org/licenses/gpl-3.0.txt
Text Domain: so-css
*/

// Handle the legacy CSS editor that came with SiteOrigin themes
include plugin_dir_path( __FILE__ ) . 'inc/legacy.php';

define( 'SOCSS_VERSION', '1.2.3' );
define( 'SOCSS_JS_SUFFIX', '.min' );

/**
 * Class SiteOrigin_CSS The main class for the SiteOrigin CSS Editor
 */
class SiteOrigin_CSS {
	private $theme;
	private $snippet_paths;
	
	function __construct() {
		$this->theme = basename( get_template_directory() );
		$this->snippet_paths = array();
		
		// Main header actions
		add_action( 'plugins_loaded', array( $this, 'set_plugin_textdomain' ) );
		
		// Priority 20 is necessary to ensure our CSS takes precedence.
		add_action( 'wp_head', array( $this, 'enqueue_css' ), 20 );
		
		// All the admin actions
		add_action( 'admin_menu', array( $this, 'action_admin_menu' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_scripts' ), 20 );
		add_action( 'admin_enqueue_scripts', array( $this, 'dequeue_admin_scripts' ), 19 );
		add_action( 'load-appearance_page_so_custom_css', array( $this, 'add_help_tab' ) );
		
		// Add the action links.
		add_action( 'plugin_action_links_' . plugin_basename( __FILE__ ), array( $this, 'plugin_action_links' ) );
		
		// The request to hide the getting started video
		add_action( 'wp_ajax_socss_hide_getting_started', array( $this, 'admin_action_hide_getting_started' ) );
		
		add_action( 'wp_ajax_socss_get_post_css', array( $this, 'admin_action_get_post_css' ) );
		add_action( 'wp_ajax_socss_get_revisions_list', array( $this, 'admin_action_get_revisions_list' ) );
  
		if ( ! is_admin() ) {
			if( isset( $_GET['so_css_preview'] )  ) {

				add_action( 'plugins_loaded', array($this, 'disable_ngg_resource_manager') );
				add_filter( 'show_admin_bar', '__return_false' );
				add_filter( 'wp_enqueue_scripts', array($this, 'enqueue_inspector_scripts') );
				add_filter( 'wp_footer', array($this, 'inspector_templates') );
	
				// We'll be grabbing all the enqueued scripts and outputting them
				add_action( 'wp_enqueue_scripts', array($this, 'inline_inspector_scripts'), 100 );
			}
		}
	}
	
	/**
	 * Get a singleton of the SiteOrigin CSS.
	 *
	 * @return SiteOrigin_CSS
	 */
	static function single() {
		static $single;
		
		if ( empty( $single ) ) {
			$single = new SiteOrigin_CSS();
		}
		
		return $single;
	}
	
	/**
	 * Retrieve the current custom CSS for a given theme and post id combination.
	 *
	 * @param $theme string The name of the theme for which to retrieve custom CSS.
	 * @param $post_id int The ID of the specific post for which to retrieve custom CSS.
	 *
	 * @return string The custom CSS for the theme and post ID combination.
	 */
	function get_custom_css( $theme, $post_id = null ) {
		$css_key = 'siteorigin_custom_css[' . $theme . ']';
		if ( empty( $post_id ) ) {
			return get_option( $css_key, '' );
		}
		
		return get_post_meta( $post_id, $css_key, true );
	}
	
	/**
	 * Save custom CSS for a given theme and post id combination.
	 *
	 * @param $custom_css string The custom CSS to save.
	 * @param $theme string The name of the theme for which to save custom CSS.
	 * @param $post_id int The ID of the specific post for which to save custom CSS.
	 *
	 * @return bool Whether or not saving the custom CSS was successful.
	 */
	function save_custom_css( $custom_css, $theme, $post_id = null ) {
		$css_key = 'siteorigin_custom_css[' . $theme . ']';
		if ( empty( $post_id ) ) {
			$current = get_option( $css_key );
			if ( $current === false ) {
				return add_option( $css_key, $custom_css, '', 'no' );
			} else {
				return update_option( $css_key, $custom_css );
			}
		}
		
		if ( metadata_exists( 'post', $post_id, $css_key ) ) {
			return update_post_meta( $post_id, $css_key, $custom_css );
		}
		
		return add_post_meta( $post_id, $css_key, $custom_css );
	}
	
	/**
	 * Save custom CSS for a given theme and post id combination to a file in the uploads directory to allow for caching.
	 *
	 * @param $custom_css
	 * @param $theme
	 * @param null $post_id
	 */
	function save_custom_css_file( $custom_css, $theme, $post_id = null ) {
		if ( WP_Filesystem() ) {
			global $wp_filesystem;
			$upload_dir = wp_upload_dir();
			$upload_dir_path = $upload_dir['basedir'] . '/so-css/';
			
			if ( ! $wp_filesystem->is_dir( $upload_dir_path ) ) {
				$wp_filesystem->mkdir( $upload_dir_path );
			}
			
			$css_file_name = 'so-css-' . $theme . ( ! empty( $post_id ) ? '_' . $post_id : '' );
			$css_file_path = $upload_dir_path . $css_file_name . '.css';
			
			if ( file_exists( $css_file_path ) ) {
				$wp_filesystem->delete( $css_file_path );
			}
			
			$wp_filesystem->put_contents(
				$css_file_path,
				$custom_css
			);
		}
	}
	
	/**
	 * Retrieve the previous revisions of custom CSS for a given theme and post id combination.
	 *
	 * @param $theme string The name of the theme for which to retrieve custom CSS revisions.
	 * @param $post_id int The ID of the specific post for which to retrieve custom CSS revisions.
	 *
	 * @return array The custom CSS revisions for the theme and post ID combination.
	 */
	function get_custom_css_revisions( $theme, $post_id = null ) {
		$css_key = 'siteorigin_custom_css_revisions[' . $theme . ']';
		if ( empty( $post_id ) ) {
			return get_option( $css_key, '' );
		}
		
		return get_post_meta( $post_id, $css_key, true );
	}
	
	/**
	 * Adds a custom CSS revision for a given theme and post id combination.
	 *
	 * @param $custom_css string The custom CSS to add as a revision.
	 * @param $theme string The name of the theme for which to save custom CSS.
	 * @param $post_id int The ID of the specific post for which to save custom CSS.
	 *
	 * @return bool Whether or not adding the custom CSS revision was successful.
	 */
	function add_custom_css_revision( $custom_css, $theme, $post_id = null ) {
		$revisions = $this->get_custom_css_revisions( $this->theme, $post_id );
		
		$css_key = 'siteorigin_custom_css_revisions[' . $theme . ']';
		
		if ( empty( $revisions ) ) {
			$revisions = array();
			if ( empty( $post_id ) ) {
				add_option( $css_key, $revisions, '', 'no' );
			} else {
				add_post_meta( $post_id, $css_key, $revisions );
			}
		}
		$revisions[ time() ] = $custom_css;
		
		// Sort the revisions and cut off any old ones.
		krsort( $revisions );
		$revisions = array_slice( $revisions, 0, 15, true );
		
		if ( empty( $post_id ) ) {
			return update_option( $css_key, $revisions );
		}
		
		return update_post_meta( $post_id, $css_key, $revisions );
	}
	
	/**
	 * Enqueue or print inline CSS.
	 */
	function enqueue_css() {
		
		$this->enqueue_custom_css( $this->theme );
		
		if ( is_singular() ) {
			$this->enqueue_custom_css( $this->theme, get_the_ID() );
		}
		
	}
	
	/**
	 * Enqueue the custom CSS for the given theme and post id combination.
	 *
	 * @param $theme string The name of the theme for which to enqueue custom CSS.
	 * @param $post_id int The ID of the specific post for which to enqueue custom CSS.
	 *
	 */
	function enqueue_custom_css( $theme, $post_id = null ) {
		
		$upload_dir = wp_upload_dir();
		$upload_dir_path = $upload_dir['basedir'] . '/so-css/';
		
		$css_id = $theme . ( ! empty( $post_id ) ? '_' . $post_id : '' );
		$css_file_name = 'so-css-' . $css_id;
		$css_file_path = $upload_dir_path . $css_file_name . '.css';
		
		if ( empty( $_GET['so_css_preview'] ) && ! is_admin() && file_exists( $css_file_path ) ) {
			wp_enqueue_style(
				'so-css-' . $css_id,
				set_url_scheme( $upload_dir['baseurl'] . '/so-css/' . $css_file_name . '.css' ),
				array(),
				$this->get_latest_revision_timestamp()
			);
		} else {
			$custom_css = $this->get_custom_css( $theme, $post_id );
			// We just need to enqueue a dummy style
			if ( ! empty( $custom_css ) ) {
				echo "<style id='" . sanitize_html_class( $css_id ) . "-custom-css' class='siteorigin-custom-css' type='text/css'>\n";
				echo self::sanitize_css( $custom_css ) . "\n";
				echo "</style>\n";
			}
		}
	}
	
	function set_plugin_textdomain() {
		load_plugin_textdomain( 'so-css', false, plugin_dir_path( __FILE__ ) . 'lang/' );
	}
	
	/**
	 * Action to run on the admin action.
	 */
	function action_admin_menu() {
		add_theme_page( __( 'Custom CSS', 'so-css' ), __( 'Custom CSS', 'so-css' ), 'edit_theme_options', 'so_custom_css', array(
			$this,
			'display_admin_page'
		) );
		
		if ( current_user_can( 'edit_theme_options' ) && isset( $_POST['siteorigin_custom_css_save'] ) ) {
			check_admin_referer( 'custom_css', '_sononce' );
			
			// Sanitize CSS input. Should keep most tags, apart from script and style tags.
			$custom_css = self::sanitize_css( filter_input( INPUT_POST, 'custom_css' ) );
			$socss_post_id = filter_input( INPUT_GET, 'socss_post_id', FILTER_VALIDATE_INT );
			
			$current = $this->get_custom_css( $this->theme, $socss_post_id );
			$this->save_custom_css( $custom_css, $this->theme, $socss_post_id );
			
			// If this has changed, then add a revision.
			if ( $current != $custom_css ) {
				$this->add_custom_css_revision( $custom_css, $this->theme, $socss_post_id );
				
				$this->save_custom_css_file( $custom_css, $this->theme, $socss_post_id );
			}
		}
	}
	
	/**
	 * Display the help tab
	 */
	function add_help_tab() {
		$screen = get_current_screen();
		$screen->add_help_tab( array(
			'id'      => 'custom-css',
			'title'   => __( 'Custom CSS', 'so-css' ),
			'content' => '<p>'
						 . sprintf( __( "SiteOrigin CSS adds any custom CSS you enter here into your site's header. ", 'so-css' ) )
						 . __( "These changes will persist across updates so it's best to make all your changes here. ", 'so-css' )
						 . '</p>'
		) );
	}
	
	function enqueue_admin_scripts( $page ) {
		if ( $page != 'appearance_page_so_custom_css' ) {
			return;
		}
		
		// Core WordPress stuff that we use
		wp_enqueue_media();
		
		// Enqueue the codemirror scripts. Call Underscore and Backbone dependencies so they're enqueued first to prevent conflicts.
		wp_enqueue_script( 'codemirror', plugin_dir_url( __FILE__ ) . 'lib/codemirror/lib/codemirror' . SOCSS_JS_SUFFIX . '.js', array(
			'underscore',
			'backbone'
		), '5.2.0' );
		wp_enqueue_script( 'codemirror-mode-css', plugin_dir_url( __FILE__ ) . 'lib/codemirror/mode/css/css' . SOCSS_JS_SUFFIX . '.js', array(), '5.2.0' );
		
		// Add in all the linting libs
		wp_enqueue_script( 'codemirror-lint', plugin_dir_url( __FILE__ ) . 'lib/codemirror/addon/lint/lint' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror' ), '5.2.0' );
		wp_enqueue_script( 'codemirror-lint-css', plugin_dir_url( __FILE__ ) . 'lib/codemirror/addon/lint/css-lint' . SOCSS_JS_SUFFIX . '.js', array(
			'codemirror',
			'codemirror-lint-css-lib'
		), '5.2.0' );
		wp_enqueue_script( 'codemirror-lint-css-lib', plugin_dir_url( __FILE__ ) . 'js/csslint' . SOCSS_JS_SUFFIX . '.js', array(), '0.10.0' );
		
		// The CodeMirror autocomplete library
		wp_enqueue_script( 'codemirror-show-hint', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/hint/show-hint' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror' ), '5.2.0' );

		// CodeMirror search and dialog addons
		wp_enqueue_script( 'codemirror-dialog', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/dialog/dialog' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror' ), '5.2.0' );

		wp_enqueue_script( 'codemirror-search', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/search' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror' ), '5.37.0' );
		wp_enqueue_script( 'codemirror-search-searchcursor', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/searchcursor' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror', 'codemirror-search' ), '5.37.0' );
		wp_enqueue_script( 'codemirror-search-match-cursor', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/match-highlighter' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror', 'codemirror-search' ), '5.37.0' );
		wp_enqueue_script( 'codemirror-search-matchesonscrollbar', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/matchesonscrollbar' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror', 'codemirror-search' ), '5.37.0' );
		wp_enqueue_script( 'codemirror-scroll-annotatescrollbar', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/scroll/annotatescrollbar' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror', 'codemirror-search', 'codemirror-search-matchesonscrollbar' ), '5.37.0' );
		wp_enqueue_script( 'codemirror-jump-to-line', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/jump-to-line' . SOCSS_JS_SUFFIX . '.js', array( 'codemirror', 'codemirror-search' ), '5.37.0' );

		// All the CodeMirror styles
		wp_enqueue_style( 'codemirror', plugin_dir_url( __FILE__ ) . 'lib/codemirror/lib/codemirror.css', array(), '5.2.0' );
		wp_enqueue_style( 'codemirror-theme-neat', plugin_dir_url( __FILE__ ) . 'lib/codemirror/theme/neat.css', array(), '5.2.0' );
		wp_enqueue_style( 'codemirror-lint-css', plugin_dir_url( __FILE__ ) . 'lib/codemirror/addon/lint/lint.css', array(), '5.2.0' );
		wp_enqueue_style( 'codemirror-show-hint', plugin_dir_url( __FILE__ ) . 'lib/codemirror/addon/hint/show-hint.css', array(), '5.2.0' );
		wp_enqueue_style( 'codemirror-dialog', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/dialog/dialog.css', '5.2.0' );
		wp_enqueue_style( 'codemirror-search-matchesonscrollbar', plugin_dir_url(__FILE__) . 'lib/codemirror/addon/search/matchesonscrollbar.css', array(), '5.37.0' );
		
		// Enqueue the scripts for theme CSS processing
		wp_enqueue_script( 'siteorigin-css-parser-lib', plugin_dir_url( __FILE__ ) . 'js/css' . SOCSS_JS_SUFFIX . '.js', array( 'jquery' ), SOCSS_VERSION );
		
		// There are conflicts between CSS linting and the built in WordPress color picker, so use something else
		wp_enqueue_style( 'siteorigin-custom-css-minicolors', plugin_dir_url( __FILE__ ) . 'lib/minicolors/jquery.minicolors.css', array(), '2.1.7' );
		wp_enqueue_script( 'siteorigin-custom-css-minicolors', plugin_dir_url( __FILE__ ) . 'lib/minicolors/jquery.minicolors' . SOCSS_JS_SUFFIX . '.js', array( 'jquery' ), '2.1.7' );
		
		// We need Font Awesome
		wp_enqueue_style( 'siteorigin-custom-css-font-awesome', plugin_dir_url( __FILE__ ) . 'lib/fontawesome/css/font-awesome.min.css', array(), SOCSS_VERSION );
		
		// URI parsing for preview navigation
		wp_enqueue_script( 'siteorigin-uri', plugin_dir_url( __FILE__ ) . 'js/URI' . SOCSS_JS_SUFFIX . '.js', array(), SOCSS_VERSION, true );
		
		// All the custom SiteOrigin CSS stuff
		wp_enqueue_script( 'siteorigin-custom-css', plugin_dir_url(__FILE__) . 'js/editor' . SOCSS_JS_SUFFIX . '.js', array( 'jquery', 'underscore', 'backbone', 'siteorigin-css-parser-lib', 'codemirror' ), SOCSS_VERSION, true );
		wp_enqueue_style( 'siteorigin-custom-css', plugin_dir_url(__FILE__) . 'css/admin.css', array( ), SOCSS_VERSION );

		
		// Pretty confusing, but it seems we should be using `home_url` and NOT `site_url`
		// as described here => https://wordpress.stackexchange.com/a/50605
		$init_url = home_url();
		
		if ( ! empty( $socss_post_id ) && is_int( $socss_post_id ) ) {
			$init_url = set_url_scheme( get_permalink( $socss_post_id ) );
		}
		
		$open_visual_editor = ! empty( $_REQUEST['open_visual_editor'] );
		
		$home_url = add_query_arg( 'so_css_preview', '1', $init_url );
		
		wp_localize_script( 'siteorigin-custom-css', 'socssOptions', array(
			'themeCSS' => SiteOrigin_CSS::single()->get_theme_css(),
			'homeURL' => $home_url,
			'postCssUrlRoot' => wp_nonce_url( admin_url('admin-ajax.php?action=socss_get_post_css'), 'get_post_css' ),
			'getRevisionsListAjaxUrl' => wp_nonce_url( admin_url('admin-ajax.php?action=socss_get_revisions_list'), 'get_revisions_list' ),
			'openVisualEditor' => $open_visual_editor,
			
			'propertyControllers' => apply_filters( 'siteorigin_css_property_controllers', $this->get_property_controllers() ),
			
			'loc' => array(
				'unchanged'    => __( 'Unchanged', 'so-css' ),
				'select'       => __( 'Select', 'so-css' ),
				'select_image' => __( 'Select Image', 'so-css' ),
				'leave'        => __( 'Are you sure you want to leave without saving?', 'so-css' ),
			)
		) );
		
		// This is for the templates required by the CSS editor. Ideally this would be out in the footer, but we need
		// it earlier for dependent scripts.
		include plugin_dir_path( __FILE__ ) . 'tpl/js-templates.php';
	}
	
	/**
	 * @param $page
	 */
	function dequeue_admin_scripts( $page ) {
		if ( $page != 'appearance_page_so_custom_css' ) {
			return;
		}
		
		// Dequeue the core WordPress color picker on the custom CSS page.
		// This script causes conflicts and other plugins seem to be enqueueing it on the SO CSS admin page.
		wp_dequeue_script( 'wp-color-picker' );
		wp_dequeue_style( 'wp-color-picker' );
	}
	
	/**
	 * Get all the available property controllers
	 */
	function get_property_controllers() {
		return include plugin_dir_path( __FILE__ ) . 'inc/controller-config.php';
	}
	
	function plugin_action_links( $links ) {
		if ( isset( $links['edit'] ) ) {
			unset( $links['edit'] );
		}
		$links['css_editor'] = '<a href="' . admin_url( 'themes.php?page=so_custom_css' ) . '">' . __( 'CSS Editor', 'so-css' ) . '</a>';
		$links['support'] = '<a href="https://siteorigin.com/thread/" target="_blank">' . __( 'Support', 'so-css' ) . '</a>';
		
		return $links;
	}
	
	function display_admin_page() {
		
		$socss_post_id = filter_input( INPUT_GET, 'socss_post_id', FILTER_VALIDATE_INT );
		$theme = filter_input( INPUT_GET, 'theme' );
		$time = filter_input( INPUT_GET, 'time', FILTER_VALIDATE_INT );
		
		$page_title = __( 'SiteOrigin CSS', 'so-css' );
		$theme_obj = wp_get_theme();
		$theme_name = $theme_obj->get( 'Name' );
		$editor_description = sprintf( __( 'Changes apply to %s and its child themes', 'so-css' ), $theme_name );
		$save_button_label = __( 'Save CSS', 'so-css' );
		$form_save_url = admin_url( 'themes.php?page=so_custom_css' );
		
		if ( ! empty( $socss_post_id ) ) {
			$selected_post = get_post( $socss_post_id );
			
			$page_title = sprintf(
				__( 'Editing CSS for: %s', 'so-css' ),
				$selected_post->post_title
			);
			
			$editor_description = sprintf(
				__( 'Changes apply to the %s %s when the current theme is %s or its child themes', 'so-css' ),
				$selected_post->post_type,
				$selected_post->post_title,
				$theme_name
				);
			$post_type_obj = get_post_type_object( $selected_post->post_type );
			$post_type_labels = $post_type_obj->labels;
			$save_button_label = sprintf( __( 'Save %s CSS', 'so-css' ), $post_type_labels->singular_name );
			$form_save_url = add_query_arg( 'socss_post_id', urlencode( $socss_post_id ), $form_save_url );
		}
		$custom_css = $this->get_custom_css( $this->theme, $socss_post_id );
		$custom_css_revisions = $this->get_custom_css_revisions( $this->theme, $socss_post_id );
		$current_revision = 0;
		
		if ( ! empty( $theme ) && $theme == $this->theme && ! empty( $time ) && ! empty( $custom_css_revisions[ $time ] ) ) {
			$current_revision = $time;
			$custom_css = $custom_css_revisions[ $time ];
		}
		
		if ( ! empty ( $current_revision ) ) {
			$save_button_label = __( 'Revert to this revision', 'so-css' );
		}
		
		if ( ! empty( $custom_css_revisions ) ) {
			krsort( $custom_css_revisions );
		}
		
		$theme = basename( get_template_directory() );
		
		include plugin_dir_path( __FILE__ ) . 'tpl/page.php';
	}
	
	
	function display_teaser() {
		return apply_filters( 'siteorigin_premium_upgrade_teaser', true ) &&
			   ! defined( 'SITEORIGIN_PREMIUM_VERSION' );
	}
	
	/**
	 *  Generates the url to edit the custom CSS for a post.
	 */
	function get_edit_css_link( $post ) {
		$url = admin_url( 'themes.php?page=so_custom_css' );
		if ( ! is_int( $post ) ) {
			$post = get_post( $post );
			$post = $post->ID;
		}
		
		return empty( $post ) ? $url : add_query_arg( array(
			'socss_post_id' => urlencode( $post ),
			'open_visual_editor' => 1,
		), $url );
	}
	/**
	 *
	 */
	function admin_action_hide_getting_started() {
		if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( $_GET['_wpnonce'], 'hide' ) ) {
			return;
		}
		
		$user = wp_get_current_user();
		if ( ! empty( $user ) ) {
			update_user_meta( $user->ID, 'socss_hide_gs', true );
		}
	}
	
	/**
	 * Retrieves the post specific CSS for the supplied postId.
	 */
	function admin_action_get_post_css() {
		if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( $_GET['_wpnonce'], 'get_post_css' ) ) {
			wp_die(
				__( 'The supplied nonce is invalid.', 'siteorigin-panels' ),
				__( 'Invalid nonce.', 'siteorigin-panels' ),
				403
			);
		}
		
		$post_id = filter_input( INPUT_GET, 'postId', FILTER_VALIDATE_INT );
		
		$current = $this->get_custom_css( $this->theme, $post_id );
		
		$url = empty( $post_id ) ? home_url() : set_url_scheme( get_permalink( $post_id ) );
		
		wp_send_json( array( 'css' => empty( $current ) ? '' : $current, 'postUrl' => $url ) );
	}
	
	/**
	 * Retrieves the past revisions of post specific CSS for the supplied postId.
	 */
	function admin_action_get_revisions_list() {
		if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( $_GET['_wpnonce'], 'get_revisions_list' ) ) {
			wp_die(
				__( 'The supplied nonce is invalid.', 'siteorigin-panels' ),
				__( 'Invalid nonce.', 'siteorigin-panels' ),
				403
			);
		}
		
		$post_id = filter_input( INPUT_GET, 'postId', FILTER_VALIDATE_INT );
		
		$this->custom_css_revisions_list( $this->theme, $post_id );
		
		wp_die();
	}
	
	function custom_css_revisions_list( $theme, $post_id = null, $current_revision = null ) {
		
		$revisions = $this->get_custom_css_revisions( $theme, $post_id );
		
		if ( is_array( $revisions ) && ! empty( $revisions ) ) {
			$i = 0;
			foreach ( $revisions as $time => $css ) {
				$is_current = ( empty( $current_revision ) && $i == 0 ) || ( ! empty( $current_revision ) && $time == $current_revision );
				$query_args = array( 'theme' => $theme, 'time' => $time, 'open_visual_editor' => false );
				if ( ! empty( $post_id ) ) {
					$query_args['socss_post_id'] = $post_id;
				}
				?>
				<li>
					<?php if ( ! $is_current ) : ?>
					<a href="<?php echo esc_url( add_query_arg( $query_args, admin_url( 'themes.php?page=so_custom_css' ) ) ) ?>"
					   class="load-css-revision">
					<?php endif; ?>
					<?php echo date('j F Y @ H:i:s', $time + get_option('gmt_offset') * 60 * 60) ?>
					<?php if ( ! $is_current ) : ?>
					</a>
					<?php endif; ?>
					(<?php printf( __('%d chars', 'so-css'), strlen( $css ) ) ?>)<?php if ( $i == 0 ) : ?> (<?php _e( 'Latest', 'so-css' ) ?>)<?php endif; ?>
				</li>
				<?php
				$i++;
			}
		} else {
			printf( '<em>%s</em>', __( 'No revisions yet.', 'so-css' ) );
		}
	}
	
	/**
	 *  Add one or more paths to the registered snippet paths
	 *
	 * @param string|array $path
	 */
	function register_snippet_path( $path ) {
		$this->snippet_paths = array_merge( $this->snippet_paths, (array) $path );
	}
	
	/**
	 * Get all the available snippets
	 *
	 * @return array|bool
	 */
	function get_snippets() {
		// Get the snippet paths
		$snippet_paths = apply_filters( 'siteorigin_css_snippet_paths', $this->snippet_paths );
		if ( empty( $snippet_paths ) ) {
			return array();
		}
		
		static $snippets = array();
		if ( ! empty( $snippets ) ) {
			return $snippets;
		}
		
		if ( ! WP_Filesystem() ) {
			return false;
		}
		global $wp_filesystem;
		foreach ( $snippet_paths as $path ) {
			foreach ( glob( $path . '/*.css' ) as $css_file ) {
				$data = get_file_data( $css_file, array(
					'Name'        => 'Name',
					'Description' => 'Description',
				) );
				
				// Get the CSS and strip out the first header
				$css = $wp_filesystem->get_contents( $css_file );
				$css = preg_replace( '!/\*.*?\*/!s', '', $css, 1 );
				
				$snippets[] = wp_parse_args( $data, array(
					'css' => str_replace( "\t", '  ', trim( $css ) ),
				) );
			}
		}
		
		usort( $snippets, array( $this, 'sort_snippet_callback' ) );
		
		return $snippets;
	}
	
	/**
	 * Sort snippets by name.
	 *
	 * @param $a
	 * @param $b
	 *
	 * @return int
	 */
	static function sort_snippet_callback( $a, $b ) {
		return $a['Name'] > $b['Name'] ? 1 : - 1;
	}
	
	/**
	 * A very simple CSS sanitization function.
	 *
	 * @param $css
	 *
	 * @return string
	 */
	static function sanitize_css( $css ) {
		return trim( strip_tags( $css ) );
	}
	
	/**
	 * Get all the available theme CSS
	 */
	function get_theme_css() {
		$css = '';
		if ( file_exists( get_template_directory() . '/style.css' ) ) {
			$css .= file_get_contents( get_template_directory() . '/style.css' );
		}
		
		if ( is_child_theme() ) {
			$css .= file_get_contents( get_stylesheet_directory() . '/style.css' );
		}
		
		// Remove all CSS comments
		$regex = array(
			"`^([\t\s]+)`ism"                       => '',
			"`^\/\*(.+?)\*\/`ism"                   => "",
			"`([\n\A;]+)\/\*(.+?)\*\/`ism"          => "$1",
			"`([\n\A;\s]+)//(.+?)[\n\r]`ism"        => "$1\n",
			"`(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+`ism" => "\n"
		);
		$css = preg_replace( array_keys( $regex ), $regex, $css );
		$css = preg_replace( '/\s+/', ' ', $css );
		
		return $css;
	}
	
	function enqueue_inspector_scripts() {
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return;
		}
		
		wp_enqueue_style( 'dashicons' );
		
		wp_enqueue_script( 'siteorigin-css-parser-lib', plugin_dir_url( __FILE__ ) . 'js/css' . SOCSS_JS_SUFFIX . '.js', array( 'jquery' ), SOCSS_VERSION );
		
		wp_enqueue_script( 'siteorigin-css-sizes', plugin_dir_url( __FILE__ ) . 'js/jquery.sizes' . SOCSS_JS_SUFFIX . '.js', array( 'jquery' ), '0.33' );
		wp_enqueue_script( 'siteorigin-css-specificity', plugin_dir_url( __FILE__ ) . 'js/specificity' . SOCSS_JS_SUFFIX . '.js', array() );
		wp_enqueue_script( 'siteorigin-css-inspector', plugin_dir_url( __FILE__ ) . 'js/inspector' . SOCSS_JS_SUFFIX . '.js', array(
			'jquery',
			'underscore',
			'backbone'
		), SOCSS_VERSION, true );
		wp_enqueue_style( 'siteorigin-css-inspector', plugin_dir_url( __FILE__ ) . 'css/inspector.css', array(), SOCSS_VERSION );
		
		wp_localize_script( 'siteorigin-css-inspector', 'socssOptions', array() );
	}
	
	function inspector_templates() {
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return;
		}
		
		include plugin_dir_path( __FILE__ ) . 'tpl/inspector-templates.php';
	}
	
	/**
	 * Change the stylesheets to all be inline
	 */
	function inline_inspector_scripts() {
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return;
		}
		
		$regex = array(
			"`^([\t\s]+)`ism"                       => '',
			"`^\/\*(.+?)\*\/`ism"                   => "",
			"`([\n\A;]+)\/\*(.+?)\*\/`ism"          => "$1",
			"`([\n\A;\s]+)//(.+?)[\n\r]`ism"        => "$1\n",
			"`(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+`ism" => "\n"
		);
		
		global $wp_styles;
		if ( empty( $wp_styles->queue ) ) {
			return;
		}
		
		// Make each of the scripts inline
		foreach ( $wp_styles->queue as $handle ) {
			if ( $handle === 'siteorigin-css-inspector' || $handle === 'dashicons' ) {
				continue;
			}
			$style = $wp_styles->registered[ $handle ];
			if ( empty( $style->src ) || substr( $style->src, 0, 4 ) !== 'http' ) {
				continue;
			}
			$response = wp_remote_get( $style->src );
			if ( is_wp_error( $response ) || $response['response']['code'] !== 200 || empty( $response['body'] ) ) {
				continue;
			}
			
			$css = $response['body'];
			$css = preg_replace( array_keys( $regex ), $regex, $css );
			
			?>
			<script type="text/css" class="socss-theme-styles"
					id="socss-inlined-style-<?php echo sanitize_html_class( $handle ) ?>">
				<?php echo strip_tags( $css ); ?>
			</script>
			<?php
		}
	}
	
	function disable_ngg_resource_manager() {
		if ( ! current_user_can( 'edit_theme_options' ) ) {
			return;
		}
		
		//The NextGen Gallery plugin does some weird interfering with the output buffer.
		define( 'NGG_DISABLE_RESOURCE_MANAGER', true );
	}
	
	private function get_latest_revision_timestamp() {
		$revisions = $this->get_custom_css_revisions( $this->theme );
		if ( empty( $revisions ) ) {
			return false;
		}
		krsort( $revisions );
		$revision_times = array_keys( $revisions );
		
		return $revision_times[0];
	}
}

// Initialize the single
SiteOrigin_CSS::single();