<?php
/**
 * File: Generic_Plugin_Admin.php
 *
 * @package W3TC
 */

namespace W3TC;

/**
 * Class Generic_Plugin_Admin
 *
 * phpcs:disable PSR2.Classes.PropertyDeclaration.Underscore
 * phpcs:disable PSR2.Methods.MethodDeclaration.Underscore
 */
class Generic_Plugin_Admin {
	/**
	 * Current page
	 *
	 * @var string
	 */
	private $_page = 'w3tc_dashboard';

	/**
	 * Config
	 *
	 * @var Config
	 */
	private $_config = null;

	/**
	 * Config
	 *
	 * @var bool
	 */
	private $is_w3tc_page;

	/**
	 * Message data (see Util_Admin::redirect*).
	 *
	 * @var array
	 */
	private $w3tc_message = null;

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->_config = Dispatcher::config();
	}

	/**
	 * Runs plugin
	 */
	public function run() {
		$this->is_w3tc_page = Util_Admin::is_w3tc_admin_page();

		add_action( 'admin_init', array( $this, 'admin_init' ) );
		add_action( 'admin_init_w3tc_dashboard', array( '\W3TC\Generic_WidgetServices', 'admin_init_w3tc_dashboard' ) );
		add_action( 'admin_init_w3tc_dashboard', array( '\W3TC\Generic_WidgetCommunity', 'admin_init_w3tc_dashboard' ) );
		add_action( 'admin_init_w3tc_dashboard', array( '\W3TC\Generic_WidgetBoldGrid', 'admin_init_w3tc_dashboard' ) );

		add_action( 'admin_enqueue_scripts', array( $this, 'admin_enqueue_scripts' ) );
		add_action( 'admin_print_styles-toplevel_page_w3tc_dashboard', array( '\W3TC\Generic_Page_Dashboard', 'admin_print_styles_w3tc_dashboard' ) );
		add_action( 'wp_ajax_w3tc_ajax', array( $this, 'wp_ajax_w3tc_ajax' ) );

		add_action( 'admin_head', array( $this, 'admin_head' ) );
		add_action( 'admin_footer', array( $this, 'admin_footer' ) );

		if ( is_network_admin() ) {
			add_action( 'network_admin_menu', array( $this, 'network_admin_menu' ) );
			add_filter( 'network_admin_plugin_action_links_' . W3TC_FILE, array( $this, 'plugin_action_links' ) );
			add_action( 'network_admin_notices', array( $this, 'top_nav_bar' ), 0 );
		} else {
			add_action( 'admin_menu', array( $this, 'admin_menu' ) );
			add_filter( 'plugin_action_links_' . W3TC_FILE, array( $this, 'plugin_action_links' ) );
			add_action( 'admin_notices', array( $this, 'top_nav_bar' ), 0 );
		}

		add_filter( 'favorite_actions', array( $this, 'favorite_actions' ) );

		add_action( 'in_plugin_update_message-' . W3TC_FILE, array( $this, 'in_plugin_update_message' ) );

		if ( $this->_config->get_boolean( 'pgcache.enabled' ) || $this->_config->get_boolean( 'minify.enabled' ) ) {
			add_filter( 'pre_update_option_active_plugins', array( $this, 'pre_update_option_active_plugins' ) );
		}

		$config_labels = new Generic_ConfigLabels();
		add_filter( 'w3tc_config_labels', array( $config_labels, 'config_labels' ) );

		$admin_notes = new Generic_AdminNotes();
		add_filter( 'w3tc_notes', array( $admin_notes, 'w3tc_notes' ) );
		add_filter( 'w3tc_errors', array( $admin_notes, 'w3tc_errors' ), 1000 );

		add_action( 'w3tc_ajax_faq', array( $this, 'w3tc_ajax_faq' ) );

		// Load w3tc_message.
		$message_id = Util_Request::get_string( 'w3tc_message' );
		if ( $message_id ) {
			$v = get_option( 'w3tc_message' );

			if ( isset( $v[ $message_id ] ) ) {
				$this->w3tc_message = $v[ $message_id ];
				delete_option( 'w3tc_message' );
			}
		}
	}

	/**
	 * Load action
	 *
	 * @return void
	 */
	public function load() {
		$this->add_help_tabs();
		$this->_page = Util_Admin::get_current_page();

		// Run plugin action.
		$action = false;
		foreach ( $_REQUEST as $key => $value ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
			if ( 'w3tc_' === substr( $key, 0, 5 ) ) {
				$action = $key;
				break;
			}
		}

		$executor = new Root_AdminActions();

		if ( $action && $executor->exists( $action ) ) {
			if ( ! wp_verify_nonce( Util_Request::get_string( '_wpnonce' ), 'w3tc' ) ) {
				wp_nonce_ays( 'w3tc' );
			}

			try {
				$executor->execute( $action );
			} catch ( \Exception $e ) {
				$key = 'admin_action_failed_' . $action;
				Util_Admin::redirect_with_custom_messages( array(), array( $key => $e->getMessage() ) );
			}

			exit();
		}
	}

	/**
	 * Load action
	 *
	 * @throws \Exception Exception.
	 *
	 * @return void
	 */
	public function wp_ajax_w3tc_ajax() {
		if ( ! wp_verify_nonce( Util_Request::get_string( '_wpnonce' ), 'w3tc' ) ) {
			wp_nonce_ays( 'w3tc' );
		}

		try {
			$base_capability = apply_filters( 'w3tc_ajax_base_capability_', 'manage_options' );
			$capability      = apply_filters( 'w3tc_ajax_capability_' . Util_Request::get_string( 'w3tc_action' ), $base_capability );
			if ( ! empty( $capability ) && ! current_user_can( $capability ) ) {
				throw new \Exception( 'no permissions' );
			}

			do_action( 'w3tc_ajax' );
			do_action( 'w3tc_ajax_' . Util_Request::get_string( 'w3tc_action' ) );
		} catch ( \Exception $e ) {
			echo esc_html( $e->getMessage() );
		}

		exit();
	}

	/**
	 * Admin init.
	 */
	public function admin_init() {
		// Special handling for deactivation link, it's plugins.php file.
		if ( 'w3tc_deactivate_plugin' === Util_Request::get_string( 'action' ) ) {
			Util_Activation::deactivate_plugin();
		}

		/**
		 * These have been moved here as the admin_print_scripts-{$suffix} hook with translations won't take the user locale setting
		 * into account if it's called too soon, resulting in JS not loading.
		 *
		 * Translations are needed as the "prefix" used is based on the menu/page title, which is translated (11+ year old WP bug).
		 */

		// Support page.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_support',
			array( '\W3TC\Support_Page', 'admin_print_scripts_w3tc_support' )
		);

		// Minify.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_general',
			array( '\W3TC\Minify_Plugin_Admin', 'admin_print_scripts_w3tc_general' )
		);

		// PageCache.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_pgcache',
			array( '\W3TC\PgCache_Page', 'admin_print_scripts_w3tc_pgcache' )
		);

		// Extensions.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_extensions',
			array( '\W3TC\Extension_CloudFlare_Page', 'admin_print_scripts_performance_page_w3tc_cdn' )
		);

		// Usage Statistics.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_stats',
			array( '\W3TC\UsageStatistics_Page', 'admin_print_scripts_w3tc_stats' )
		);

		$c = Dispatcher::config();

		// CDN.
		switch ( $c->get_string( 'cdn.engine' ) ) {
			case 'bunnycdn':
				$cdn_class = '\W3TC\Cdn_BunnyCdn_Page';
				break;
			case 'google_drive':
				$cdn_class = '\W3TC\Cdn_GoogleDrive_Page';
				break;
			case 'highwinds':
				$cdn_class = '\W3TC\Cdn_Highwinds_Page';
				break;
			case 'limelight':
				$cdn_class = '\W3TC\Cdn_LimeLight_Page';
				break;
			case 'rackspace_cdn':
				$cdn_class = '\W3TC\Cdn_RackSpaceCdn_Page';
				break;
			case 'rscf':
				$cdn_class = '\W3TC\Cdn_RackSpaceCloudFiles_Page';
				break;
			case 'stackpath':
				$cdn_class = '\W3TC\Cdn_StackPath_Page';
				break;
			case 'stackpath2':
				$cdn_class = '\W3TC\Cdn_StackPath2_Page';
				break;
			default:
				break;
		}

		if ( ! empty( $cdn_class ) ) {
			add_action(
				'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_cdn',
				array( $cdn_class, 'admin_print_scripts_w3tc_cdn' )
			);
		}

		// CDNFSD.
		switch ( $c->get_string( 'cdnfsd.engine' ) ) {
			case 'bunnycdn':
				$cdnfsd_class = '\W3TC\Cdnfsd_BunnyCdn_Page';
				break;
			case 'cloudflare':
				$cdnfsd_class = '\W3TC\Extension_CloudFlare_Page';
				break;
			case 'cloudfront':
				$cdnfsd_class = '\W3TC\Cdnfsd_CloudFront_Page';
				break;
			case 'limelight':
				$cdnfsd_class = '\W3TC\Cdnfsd_LimeLight_Page';
				break;
			case 'stackpath':
				$cdnfsd_class = '\W3TC\Cdnfsd_StackPath_Page';
				break;
			case 'stackpath2':
				$cdnfsd_class = '\W3TC\Cdnfsd_StackPath2_Page';
				break;
			default:
				break;
		}

		if ( ! empty( $cdnfsd_class ) ) {
			add_action(
				'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_cdn',
				array( $cdnfsd_class, 'admin_print_scripts_performance_page_w3tc_cdn' )
			);
		}

		// PageSpeed page/widget.
		add_action(
			'admin_print_scripts-' . sanitize_title( __( 'Performance', 'w3-total-cache' ) ) . '_page_w3tc_pagespeed',
			array( '\W3TC\PageSpeed_Page', 'admin_print_scripts_w3tc_pagespeed' )
		);
		add_action(
			'admin_print_scripts-toplevel_page_w3tc_dashboard',
			array( '\W3TC\PageSpeed_Widget', 'admin_print_scripts_w3tc_pagespeed_widget' )
		);

		$page_val = Util_Request::get_string( 'page' );
		if ( ! empty( $page_val ) ) {
			do_action( 'admin_init_' . $page_val );
		}
	}

	/**
	 * Enqueue admin scripts.
	 */
	public function admin_enqueue_scripts() {
		wp_register_style( 'w3tc-options', plugins_url( 'pub/css/options.css', W3TC_FILE ), array(), W3TC_VERSION );
		wp_register_style( 'w3tc-lightbox', plugins_url( 'pub/css/lightbox.css', W3TC_FILE ), array(), W3TC_VERSION );
		wp_register_style( 'w3tc-bootstrap-css', plugins_url( 'pub/css/bootstrap-buttons.css', W3TC_FILE ), array(), W3TC_VERSION );
		wp_register_style( 'w3tc-widget', plugins_url( 'pub/css/widget.css', W3TC_FILE ), array(), W3TC_VERSION );

		wp_register_script( 'w3tc-metadata', plugins_url( 'pub/js/metadata.js', W3TC_FILE ), array(), W3TC_VERSION, false );
		wp_register_script( 'w3tc-options', plugins_url( 'pub/js/options.js', W3TC_FILE ), array(), W3TC_VERSION, false );
		wp_register_script( 'w3tc-lightbox', plugins_url( 'pub/js/lightbox.js', W3TC_FILE ), array(), W3TC_VERSION, false );
		wp_register_script( 'w3tc-widget', plugins_url( 'pub/js/widget.js', W3TC_FILE ), array(), W3TC_VERSION, false );
		wp_register_script( 'w3tc-jquery-masonry', plugins_url( 'pub/js/jquery.masonry.min.js', W3TC_FILE ), array( 'jquery' ), W3TC_VERSION, false );

		// New feature count for the Feature Showcase.
		wp_register_script( 'w3tc-feature-counter', plugins_url( 'pub/js/feature-counter.js', W3TC_FILE ), array(), W3TC_VERSION, true );

		wp_localize_script(
			'w3tc-feature-counter',
			'W3TCFeatureShowcaseData',
			array( 'unseenCount' => FeatureShowcase_Plugin_Admin::get_unseen_count() )
		);

		wp_enqueue_script( 'w3tc-feature-counter' );

		// Messages.
		if ( ! is_null( $this->w3tc_message ) && isset( $this->w3tc_message['actions'] ) && is_array( $this->w3tc_message['actions'] ) ) {
			foreach ( $this->w3tc_message['actions'] as $action ) {
				do_action( 'w3tc_message_action_' . $action );
			}
		}

		// For testing.
		$w3tc_message_action_val = Util_Request::get_string( 'w3tc_message_action' );
		if ( ! empty( $w3tc_message_action_val ) ) {
			do_action( 'w3tc_message_action_' . $w3tc_message_action_val );
		}
	}

	/**
	 * Render sticky top navigation bar on all W3TC admin pages.
	 */
	public function top_nav_bar() {
		if ( Util_Admin::is_w3tc_admin_page() ) {
			require W3TC_INC_DIR . '/options/common/top_nav_bar.php';
		}
	}

	/**
	 * Define icon styles for the custom post type.
	 *
	 * @throws \Exception Exception.
	 */
	public function admin_head() {
		global $wp_version;
		global $wpdb;

		$page = Util_Request::get_string( 'page', null );

		if ( ( ! is_multisite() || is_super_admin() ) && false !== strpos( $page, 'w3tc' ) && 'w3tc_setup_guide' !== $page && ! get_site_option( 'w3tc_setupguide_completed' ) ) {
			$state_master = Dispatcher::config_state_master();

			if ( ! $this->_config->get_boolean( 'pgcache.enabled' ) && $state_master->get_integer( 'common.install' ) > strtotime( 'NOW - 1 WEEK' ) ) {
				wp_safe_redirect( esc_url( network_admin_url( 'admin.php?page=w3tc_setup_guide' ) ) );
			}
		}

		if ( empty( $this->_config->get_integer( 'pgcache.migrated.qsexempts' ) ) ) {
			$pgcache_accept_qs = array_unique( array_merge( $this->_config->get_array( 'pgcache.accept.qs' ), PgCache_QsExempts::get_qs_exempts() ) );
			sort( $pgcache_accept_qs );
			$this->_config->set( 'pgcache.accept.qs', $pgcache_accept_qs );
			$this->_config->set( 'pgcache.migrated.qsexempts', time() );

			// Save the config if the environment is ready; filesystem needs to be writable.
			try {
				$this->_config->save();
			} catch ( \Exception $e ) {
				$this->_config->set( 'pgcache.migrated.qsexempts', null );
			}
		}

		if ( 'w3tc_dashboard' === $page ) {
			?>
			<script type="text/javascript">
				jQuery( function() {
					jQuery('#normal-sortables').masonry( {
						itemSelector: '.postbox'
					} );
				} );
			</script>
			<?php
		}

		if ( $this->_config->get_boolean( 'common.track_usage' ) && $this->is_w3tc_page ) {

			$current_user = wp_get_current_user();
			$page         = Util_Request::get_string( 'page' );
			if ( 'w3tc_extensions' === $page ) {
				$page = 'extensions/' . Util_Request::get_string( 'extension' );
			}

			if ( defined( 'W3TC_DEVELOPER' ) && W3TC_DEVELOPER ) {
				$profile = 'G-Q3CHQJWERM';
			} else {
				$profile = 'G-5TFS8M5TTY';
			}

			$state = Dispatcher::config_state();

			wp_enqueue_script(
				'w3tc_ga',
				'https://www.googletagmanager.com/gtag/js?id=' . esc_attr( $profile ),
				array(),
				W3TC_VERSION,
				true
			);
			?>
			<script type="application/javascript">
				var w3tc_ga_cid;

				window.dataLayer = window.dataLayer || [];

				function w3tc_ga(){dataLayer.push(arguments);}

				w3tc_ga('js', new Date());

				w3tc_ga('config', '<?php echo esc_attr( $profile ); ?>', {
					'user_properties': {
						'plugin': 'w3-total-cache',
						'w3tc_version': '<?php echo esc_html( W3TC_VERSION ); ?>',
						'wp_version': '<?php echo esc_html( $wp_version ); ?>',
						'php_version': 'php<?php echo esc_html( phpversion() ); ?>',
						'server_software': '<?php echo esc_attr( isset( $_SERVER['SERVER_SOFTWARE'] ) ? sanitize_text_field( wp_unslash( $_SERVER['SERVER_SOFTWARE'] ) ) : '' ); ?>',
						'wpdb_version': 'mysql<?php echo esc_attr( $wpdb->db_version() ); ?>',
						'home_url': '<?php echo esc_url( Util_Environment::home_url_host() ); ?>',
						'w3tc_install_version': '<?php echo esc_attr( $state->get_string( 'common.install_version' ) ); ?>',
						'w3tc_edition': '<?php echo esc_attr( Util_Environment::w3tc_edition( $this->_config ) ); ?>',
						'w3tc_widgets': '<?php echo esc_attr( Util_Widget::list_widgets() ); ?>',
						'page': '<?php echo esc_attr( $page ); ?>'
					}
				});

				const cidPromise = new Promise(resolve => {
					w3tc_ga('get', '<?php echo esc_attr( $profile ); ?>', 'client_id', resolve);
				});
				cidPromise.then((cid) => {
					w3tc_ga_cid = cid;
				});
			</script>
			<?php
		}

		?>
		<style type="text/css" media="screen">
			li.toplevel_page_w3tc_dashboard .wp-menu-image:before{
				content:'\0041';
				top: 2px;
				font-family: 'w3tc';
			}
		</style>
		<script>
			jQuery(document).ready( function($) {
				$('#toplevel_page_w3tc_dashboard ul li').find('a[href*="w3tc_faq"]')
					.prop('target','_blank')
					.prop('href', <?php echo wp_json_encode( W3TC_FAQ_URL ); ?>);
			} );
		</script>
		<?php
	}

	/**
	 * Defines the W3TC footer
	 */
	public function admin_footer() {
		if ( $this->is_w3tc_page ) {
			require W3TC_INC_DIR . '/options/common/footer.php';
		}
	}

	/**
	 * Render network admin menu.
	 */
	public function network_admin_menu() {
		$this->_admin_menu( 'manage_network_options' );
	}

	/**
	 * Render admin menu.
	 */
	public function admin_menu() {
		$this->_admin_menu( 'manage_options' );
	}

	/**
	 * Admin menu
	 *
	 * @param string $base_capability Base compatibility.
	 *
	 * @return void
	 */
	private function _admin_menu( $base_capability ) {
		$base_capability = apply_filters( 'w3tc_capability_menu', $base_capability );

		if ( current_user_can( $base_capability ) ) {
			$menus         = Dispatcher::component( 'Root_AdminMenu' );
			$submenu_pages = $menus->generate( $base_capability );

			/**
			 * Only admin can modify W3TC settings
			 */
			foreach ( $submenu_pages as $submenu_page ) {
				add_action( 'load-' . $submenu_page, array( $this, 'load' ) );
				add_action( 'admin_print_styles-' . $submenu_page, array( $this, 'admin_print_styles' ) );
				add_action( 'admin_print_scripts-' . $submenu_page, array( $this, 'admin_print_scripts' ) );
			}

			global $pagenow;
			if ( 'plugins.php' === $pagenow ) {
				add_action( 'admin_print_scripts', array( $this, 'load_plugins_page_js' ) );
				add_action( 'admin_print_styles', array( $this, 'print_plugins_page_css' ) );
			}

			global $pagenow;
			if ( 'plugins.php' === $pagenow || $this->is_w3tc_page ||
				! empty( Util_Request::get_string( 'w3tc_note' ) ) ||
				! empty( Util_Request::get_string( 'w3tc_error' ) ) ||
				! empty( Util_Request::get_string( 'w3tc_message' ) ) ) {

				// Only admin can see W3TC notices and errors.
				add_action( 'admin_notices', array( $this, 'admin_notices' ) );
				add_action( 'network_admin_notices', array( $this, 'admin_notices' ) );
			}

			global $pagenow;
			if ( ! $this->is_w3tc_page &&
				(
					! empty( Util_Request::get_string( 'w3tc_note' ) ) ||
					! empty( Util_Request::get_string( 'w3tc_error' ) ) ||
					! empty( Util_Request::get_string( 'w3tc_message' ) )
				)
			) {
				// This is needed for admin notice buttons displayed on non-w3tc pages after actions via admin top menu.
				add_action( 'admin_print_scripts-' . $pagenow, array( $this, 'admin_print_scripts' ) );
			}
		}
	}

	/**
	 * Print styles
	 *
	 * @return void
	 */
	public function admin_print_styles() {
		wp_enqueue_style( 'w3tc-options' );
		wp_enqueue_style( 'w3tc-bootstrap-css' );
		wp_enqueue_style( 'w3tc-lightbox' );
	}

	/**
	 * Print scripts.
	 */
	public function admin_print_scripts() {
		wp_enqueue_script( 'w3tc-metadata' );
		wp_enqueue_script( 'w3tc-options' );
		wp_enqueue_script( 'w3tc-lightbox' );

		if ( $this->is_w3tc_page ) {
			wp_localize_script(
				'w3tc-options',
				'w3tc_nonce',
				array( wp_create_nonce( 'w3tc' ) )
			);

			wp_localize_script(
				'w3tc-options',
				'w3tcData',
				array(
					'cdnEnabled'       => $this->_config->get_boolean( 'cdn.enabled' ),
					'cdnEngine'        => $this->_config->get_string( 'cdn.engine' ),
					'cdnFlushManually' => $this->_config->get_boolean(
						'cdn.flush_manually',
						Cdn_Util::get_flush_manually_default_override( $this->_config->get_string( 'cdn.engine' ) )
					),
					'cdnfsdEnabled'    => $this->_config->get_boolean( 'cdnfsd.enabled' ),
					'cdnfsdEngine'     => $this->_config->get_string( 'cdnfsd.engine' ),
					'cfWarning'        => wp_kses(
						sprintf(
							// translators: 1: HTML opening a tag to docs.aws.amazon.com for invalidation payments, 2: HTML closing a tag followed by HTML line break tag,
							// translators: 4: HTML line break tag, 5: HTML opening a tag to purge CDN manually, 6: HTML closing a tag.
							__(
								'Please see %1$sAmazon\'s CloudFront documentation -- Paying for file invalidation%2$sThe first 1,000 invalidation paths that you submit per month are free; you pay for each invalidation path over 1,000 in a month.%3$sYou can disable automatic purging by enabling %4$sOnly purge CDN manually%5$s.',
								'w3-total-cache'
							),
							'<a target="_blank" href="https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Invalidation.html#PayingForInvalidation">',
							'</a>.<br/>',
							'<br/>',
							'<a href="' . esc_url( admin_url( 'admin.php?page=w3tc_cdn#advanced' ) ) . '">',
							'</a>'
						),
						array(
							'a'  => array(
								'target' => array(),
								'href'   => array(),
							),
							'br' => array(),
						)
					),
					'bunnyCdnWarning'  => esc_html__(
						'Bunny CDN should only be enabled as either a CDN for objects or full-site delivery, not both at the same time.  The CDN settings have been reverted.',
						'w3-total-cache'
					),
				)
			);
		}

		switch ( $this->_page ) {
			case 'w3tc_minify':
			case 'w3tc_cachegroups':
				wp_enqueue_script(
					'w3tc_cachegroups',
					plugins_url( 'CacheGroups_Plugin_Admin_View.js', W3TC_FILE ),
					array(
						'jquery',
						'jquery-ui-sortable',
					),
					W3TC_VERSION,
					true
				);
				// No break.
			case 'w3tc_cdn':
				wp_enqueue_script( 'jquery-ui-sortable' );
				break;
		}

		if ( 'w3tc_cdn' === $this->_page ) {
			wp_enqueue_script( 'jquery-ui-dialog' );
		}

		if ( 'w3tc_dashboard' === $this->_page ) {
			wp_enqueue_script( 'w3tc-jquery-masonry' );
		}
	}

	/**
	 * Load plugins page JS.
	 */
	public function load_plugins_page_js() {
		wp_enqueue_script( 'w3tc-options' );
	}

	/**
	 * Load plugins page CSS.
	 */
	public function print_plugins_page_css() {
		?>
		<style type=\"text/css\">
			.w3tc-missing-files ul {
				margin-left: 20px;
				list-style-type: disc;
			}
			#w3tc {
				padding: 0;
			}
			#w3tc span {
				font-size: 0.6em;
				font-style: normal;
				text-shadow: none;
			}
			ul.w3tc-incomp-plugins, ul.w3-bullet-list {
				list-style: disc outside;
				margin-left: 17px;
				margin-top: 0;
				margin-bottom: 0;
			}
			ul.w3tc-incomp-plugins li div {
				width: 170px;
				display: inline-block;
			}
		</style>
		<?php
	}

	/**
	 * Contextual help list filter.
	 */
	public function add_help_tabs() {
		$screen   = get_current_screen();
		$sections = Generic_Faq::sections();
		$n        = 0;

		foreach ( $sections as $section => $data ) {
			$content = '<div class="w3tchelp_content" data-section="' . $section . '"></div>';

			$screen->add_help_tab(
				array(
					'id'      => 'w3tc_faq_' . $n,
					'title'   => $section,
					'content' => $content,
				)
			);
			$n++;
		}
	}

	/**
	 * FAQ ajax handler.
	 */
	public function w3tc_ajax_faq() {
		$section = Util_Request::get_string( 'section' );

		$entries  = Generic_Faq::parse( $section );
		$response = array();

		ob_start();
		include W3TC_DIR . '/Generic_Plugin_Admin_View_Faq.php';
		$content = ob_get_contents();
		ob_end_clean();

		echo wp_json_encode( array( 'content' => $content ) );
	}

	/**
	 * Plugin action links filter
	 *
	 * @param array $links Links array.
	 *
	 * @return array
	 */
	public function plugin_action_links( $links ) {
		array_unshift( $links, '<a class="edit" href="admin.php?page=w3tc_general">' . esc_html__( 'Settings', 'w3-total-cache' ) . '</a>' );
		array_unshift( $links, '<a class="edit" style="color: red" href="admin.php?page=w3tc_support">' . esc_html__( 'Premium Support', 'w3-total-cache' ) . '</a>' );

		if ( ! is_writable( WP_CONTENT_DIR ) || ! is_writable( Util_Rule::get_browsercache_rules_cache_path() ) ) {
			$delete_link = '<a href="' .
				wp_nonce_url( admin_url( 'plugins.php?action=w3tc_deactivate_plugin' ), 'w3tc' ) .
				'">Uninstall</a>';
			array_unshift( $links, $delete_link );
		}

		return $links;
	}

	/**
	 * Favorite actions filter.
	 *
	 * @param array $actions Actions.
	 *
	 * @return array
	 */
	public function favorite_actions( $actions ) {
		$actions[ wp_nonce_url( admin_url( 'admin.php?page=w3tc_dashboard&amp;w3tc_flush_all' ), 'w3tc' ) ] = array(
			__( 'Empty Caches', 'w3-total-cache' ),
			apply_filters( 'w3tc_capability_favorite_action_flush_all', 'manage_options' ),
		);

		return $actions;
	}

	/**
	 * Active plugins pre update option filter
	 *
	 * @param string $new_value New value.
	 *
	 * @return string
	 */
	public function pre_update_option_active_plugins( $new_value ) {
		$old_value = (array) get_option( 'active_plugins' );

		if ( $new_value !== $old_value && in_array( W3TC_FILE, (array) $new_value, true ) && in_array( W3TC_FILE, (array) $old_value, true ) ) {
			$state_note = Dispatcher::config_state_note();
			$state_note->set( 'common.show_note.plugins_updated', true );
		}

		return $new_value;
	}

	/**
	 * Show plugin changes
	 *
	 * @return void
	 */
	public function in_plugin_update_message() {
		$response = Util_Http::get( W3TC_README_URL );

		if ( is_wp_error( $response ) || 200 !== $response['response']['code'] ) {
			return;
		}

		$matches = null;
		$regexp  = '~==\s*Changelog\s*==\s*=\s*[0-9.]+\s*=(.*)(=\s*' . preg_quote( W3TC_VERSION, '~' ) . '\s*=|$)~Uis';

		$body = $response['body'];
		if ( ! preg_match( $regexp, $body, $matches ) ) {
			return;
		}

		$changelog = (array) preg_split( '~[\r\n]+~', trim( $matches[1] ) );

		echo '<div style="color: #f00;">' . esc_html__( 'Take a minute to update, here\'s why:', 'w3-total-cache' ) . '</div><div style="font-weight: normal;height:300px;overflow:auto">';
		$ul = false;

		foreach ( $changelog as $index => $line ) {
			if ( preg_match( '~^\s*\*\s*~', $line ) ) {
				if ( ! $ul ) {
					echo '<ul style="list-style: disc; margin-left: 20px;margin-top:0;">';
					$ul = true;
				}
				$line = preg_replace( '~^\s*\*\s*~', '', htmlspecialchars( $line ) );
				echo '<li style="width: 50%; margin: 0; float: left; ' . ( 0 === $index % 2 ? 'clear: left;' : '' ) . '">' . esc_html( $line ) . '</li>';
			} elseif ( $ul ) {
				echo '</ul><div style="clear: left;"></div>';
				$ul = false;
			}
		}

		if ( $ul ) {
			echo '</ul><div style="clear: left;"></div>';
		}

		echo '</div>';
	}

	/**
	 * Admin notices action
	 *
	 * @return void
	 */
	public function admin_notices() {
		$cookie_domain = Util_Admin::get_cookie_domain();

		$error_messages = array(
			'fancy_permalinks_disabled_pgcache'      => sprintf(
				// translators: 1 enable button link.
				__(
					'Fancy permalinks are disabled. Please %1$s it first, then re-attempt to enabling enhanced disk mode.',
					'w3-total-cache'
				),
				Util_Ui::button_link( 'enable', 'options-permalink.php' )
			),
			'fancy_permalinks_disabled_browsercache' => sprintf(
				// translators: 1 enable button link.
				__(
					'Fancy permalinks are disabled. Please %1$s it first, then re-attempt to enabling the \'Do not process 404 errors for static objects with WordPress\'.',
					'w3-total-cache'
				),
				Util_Ui::button_link( 'enable', 'options-permalink.php' )
			),
			'support_request_type'                   => __( 'Please select request type.', 'w3-total-cache' ),
			'support_request_url'                    => sprintf(
				// translators: 1 HTML acronym URL (uniform resource locator).
				__(
					'Please enter the address of the site in the site %1$s field.',
					'w3-total-cache'
				),
				'<acronym title="' . esc_attr__( 'Uniform Resource Locator', 'w3-total-cache' ) . '">' . esc_html__( 'URL', 'w3-total-cache' ) . '</acronym>'
			),
			'support_request_name'                   => __( 'Please enter your name in the Name field', 'w3-total-cache' ),
			'support_request_email'                  => __( 'Please enter valid email address in the E-Mail field.', 'w3-total-cache' ),
			'support_request_phone'                  => __( 'Please enter your phone in the phone field.', 'w3-total-cache' ),
			'support_request_subject'                => __( 'Please enter subject in the subject field.', 'w3-total-cache' ),
			'support_request_description'            => __( 'Please describe the issue in the issue description field.', 'w3-total-cache' ),
			'support_request_wp_login'               => __( 'Please enter an administrator login. Create a temporary one just for this support case if needed.', 'w3-total-cache' ),
			'support_request_wp_password'            => __( 'Please enter WP Admin password, be sure it\'s spelled correctly.', 'w3-total-cache' ),
			'support_request_ftp_host'               => sprintf(
				// translators: 1 HTML acronym SSH (secure shell), 2 HTML acronym FTP (file transfer protocol).
				__(
					'Please enter %1$s or %2$s host for the site.',
					'w3-total-cache'
				),
				'<acronym title="' . esc_attr__( 'Secure Shell', 'w3-total-cache' ) . '">' . esc_html__( 'SSH', 'w3-total-cache' ) . '</acronym>',
				'<acronym title="' . esc_attr__( 'File Transfer Protocol', 'w3-total-cache' ) . '">' . esc_html__( 'FTP', 'w3-total-cache' ) . '</acronym>'
			),
			'support_request_ftp_login'              => sprintf(
				// translators: 1 HTML acronym SSH (secure shell), 2 HTML acronym FTP (file transfer protocol).
				__(
					'Please enter %1$s or %2$s login for the server. Create a temporary one just for this support case if needed.',
					'w3-total-cache'
				),
				'<acronym title="' . esc_attr__( 'Secure Shell', 'w3-total-cache' ) . '">' . esc_html__( 'SSH', 'w3-total-cache' ) . '</acronym>',
				'<acronym title="' . esc_attr__( 'File Transfer Protocol', 'w3-total-cache' ) . '">' . esc_html__( 'FTP', 'w3-total-cache' ) . '</acronym>'
			),
			'support_request_ftp_password'           => sprintf(
				// translators: 1 HTML acronym SSH (secure shell), 2 HTML acronym FTP (file transfer protocol).
				__(
					'Please enter %1$s or %2$s password for the %2$s account.',
					'w3-total-cache'
				),
				'<acronym title="' . esc_attr__( 'Secure Shell', 'w3-total-cache' ) . '">' . esc_html__( 'SSH', 'w3-total-cache' ) . '</acronym>',
				'<acronym title="' . esc_attr__( 'File Transfer Protocol', 'w3-total-cache' ) . '">' . esc_html__( 'FTP', 'w3-total-cache' ) . '</acronym>'
			),
			'support_request'                        => __( 'Unable to send the support request.', 'w3-total-cache' ),
			'config_import_no_file'                  => __( 'Please select config file.', 'w3-total-cache' ),
			'config_import_upload'                   => __( 'Unable to upload config file.', 'w3-total-cache' ),
			'config_import_import'                   => __( 'Configuration file could not be imported.', 'w3-total-cache' ),
			'config_reset'                           => sprintf(
				// translators: 1 W3TC config director path.
				__(
					'Default settings could not be restored. Please run %1$s to make the configuration file write-able, then try again.',
					'w3-total-cache'
				),
				'<strong>chmod 777 ' . W3TC_CONFIG_DIR . '</strong>'
			),
			'cdn_purge_attachment'                   => __( 'Unable to purge attachment.', 'w3-total-cache' ),
			'pgcache_purge_post'                     => __( 'Unable to purge post.', 'w3-total-cache' ),
			'enable_cookie_domain'                   => sprintf(
				// translators: 1 absolute path to wp-config.php, 2 cookie domain definition, 3 require once wp-setting.php definition.
				__(
					'%1$s could not be written, please edit config and add: %2$s before %3$s.',
					'w3-total-cache'
				),
				'<strong>' . ABSPATH . 'wp-config.php</strong>',
				'<br /><strong style="color:#f00;">define(\'COOKIE_DOMAIN\', \'' . addslashes( $cookie_domain ) . '\');</strong>',
				'<strong style="color:#f00;">require_once(ABSPATH . \'wp-settings.php\');</strong>'
			),
			'disable_cookie_domain'                  => sprintf(
				// translators: 1 absolute path to wp-config.php, 2 cooke domain definition, 3 require once wp-setting.php definition.
				__(
					'%1$s could not be written, please edit config and add:%2$s before %3$s.',
					'w3-total-cache'
				),
				'<strong>' . ABSPATH . 'wp-config.php</strong>',
				'<br /><strong style="color:#f00;">define(\'COOKIE_DOMAIN\', false);</strong>',
				'<strong style="color:#f00;">require_once(ABSPATH . \'wp-settings.php\');</strong>'
			),
			'pull_zone'                              => __( 'Pull Zone could not be automatically created.', 'w3-total-cache' ),
		);

		$note_messages = array(
			'config_save'          => __( 'Plugin configuration successfully updated.', 'w3-total-cache' ),
			'config_save_flush'    => __( 'Plugin configuration successfully updated and all caches successfully emptied.', 'w3-total-cache' ),
			'flush_all'            => __( 'All caches successfully emptied.', 'w3-total-cache' ),
			'flush_memcached'      => __( 'Memcached cache(s) successfully emptied.', 'w3-total-cache' ),
			'flush_opcode'         => __( 'Opcode cache(s) successfully emptied.', 'w3-total-cache' ),
			'flush_file'           => __( 'Disk cache(s) successfully emptied.', 'w3-total-cache' ),
			'flush_pgcache'        => __( 'Page cache successfully emptied.', 'w3-total-cache' ),
			'flush_dbcache'        => __( 'Database cache successfully emptied.', 'w3-total-cache' ),
			'flush_objectcache'    => __( 'Object cache successfully emptied.', 'w3-total-cache' ),
			'flush_fragmentcache'  => __( 'Fragment cache successfully emptied.', 'w3-total-cache' ),
			'flush_minify'         => __( 'Minify cache successfully emptied.', 'w3-total-cache' ),
			'flush_browser_cache'  => __( 'Media Query string has been successfully updated.', 'w3-total-cache' ),
			'flush_varnish'        => __( 'Varnish servers successfully purged.', 'w3-total-cache' ),
			'flush_cdn'            => sprintf(
				// translators: 1 HTML acronym for CDN (content delivery network).
				__(
					'%1$s was successfully purged.',
					'w3-total-cache'
				),
				'<acronym title="' . esc_attr__( 'Content Delivery Network', 'w3-total-cache' ) . '">' . esc_html__( 'CDN', 'w3-total-cache' ) . '</acronym>'
			),
			'support_request'      => __( 'The support request has been successfully sent.', 'w3-total-cache' ),
			'config_import'        => __( 'Settings successfully imported.', 'w3-total-cache' ),
			'config_reset'         => __( 'Settings successfully restored.', 'w3-total-cache' ),
			'preview_enable'       => __( 'Preview mode was successfully enabled', 'w3-total-cache' ),
			'preview_disable'      => __( 'Preview mode was successfully disabled', 'w3-total-cache' ),
			'preview_deploy'       => __( 'Preview settings successfully deployed. Preview mode remains enabled until it\'s disabled. Continue testing new settings or disable preview mode if done.', 'w3-total-cache' ),
			'cdn_purge_attachment' => __( 'Attachment successfully purged.', 'w3-total-cache' ),
			'pgcache_purge_post'   => __( 'Post successfully purged.', 'w3-total-cache' ),
			'new_relic_save'       => __( 'New relic settings have been updated.', 'w3-total-cache' ),
			'add_in_removed'       => __( 'The add-in has been removed.', 'w3-total-cache' ),
			'enabled_edge'         => __( 'Edge mode has been enabled.', 'w3-total-cache' ),
			'disabled_edge'        => __( 'Edge mode has been disabled.', 'w3-total-cache' ),
			'pull_zone'            => __( 'Pull Zone was automatically created.', 'w3-total-cache' ),
		);

		$errors                    = array();
		$notes                     = array();
		$environment_error_present = false;

		$error = Util_Request::get_string( 'w3tc_error' );
		if ( isset( $error_messages[ $error ] ) ) {
			$errors[ $error ] = $error_messages[ $error ];
		}

		$note = Util_Request::get_string( 'w3tc_note' );
		if ( isset( $note_messages[ $note ] ) ) {
			$notes[ $note ] = $note_messages[ $note ];
		}

		// print errors happened during last request execution,
		// when we decided to redirect with error message instead of
		// printing it directly (to avoid reexecution on refresh).
		if ( ! is_null( $this->w3tc_message ) ) {
			$v = $this->w3tc_message;
			if ( isset( $v['errors'] ) && is_array( $v['errors'] ) ) {
				foreach ( $v['errors'] as $error ) {
					if ( isset( $error_messages[ $error ] ) ) {
						$errors[] = $error_messages[ $error ];
					} else {
						$errors[] = $error;
					}
				}
			}
			if ( isset( $v['notes'] ) && is_array( $v['notes'] ) ) {
				foreach ( $v['notes'] as $note ) {
					if ( isset( $note_messages[ $note ] ) ) {
						$notes[] = $note_messages[ $note ];
					} else {
						$notes[] = $note;
					}
				}
			}
		}

		/*
		 * Filesystem environment fix, if needed.
		 */
		try {
			$environment = Dispatcher::component( 'Root_Environment' );
			$environment->fix_in_wpadmin( $this->_config );

			if ( ! empty( Util_Request::get_string( 'upgrade' ) ) ) {
				$notes[] = __( 'Required files and directories have been automatically created', 'w3-total-cache' );
			}
		} catch ( Util_Environment_Exceptions $exs ) {
			$r = Util_Activation::parse_environment_exceptions( $exs );
			$n = 1;

			foreach ( $r['before_errors'] as $e ) {
				$errors[ 'generic_env_' . $n ] = $e;
				$n++;
			}

			if ( strlen( $r['required_changes'] ) > 0 ) {
				$changes_style = 'border: 1px solid black; ' .
					'background: white; ' .
					'margin: 10px 30px 10px 30px; ' .
					'padding: 10px; display: none';

				$ftp_style = 'border: 1px solid black; background: white; ' .
					'margin: 10px 30px 10px 30px; ' .
					'padding: 20px; max-width: 450px; display: none';

				$ftp_form = str_replace( 'class="wrap"', '', $exs->credentials_form() );
				$ftp_form = str_replace( '<form ', '<form name="w3tc_ftp_form" ', $ftp_form );
				$ftp_form = str_replace( '<fieldset>', '', $ftp_form );
				$ftp_form = str_replace( '</fieldset>', '', $ftp_form );
				$ftp_form = str_replace( 'id="upgrade" class="button"', 'id="upgrade" class="button w3tc-button-save"', $ftp_form );

				$error = '<strong>' . esc_html__( 'W3 Total Cache Error:', 'w3-total-cache' ) . '</strong> ' .
					esc_html__( 'Files and directories could not be automatically created to complete the installation.', 'w3-total-cache' ) .
					'<table>' .
					'<tr>' .
						'<td>' . esc_html__( 'Please execute commands manually', 'w3-total-cache' ) . '</td>' .
						'<td>' . Util_Ui::button( __( 'View required changes', 'w3-total-cache' ), '', 'w3tc-show-required-changes button' ) . '</td>' .
					'</tr>' .
					'<tr>' .
						'<td>' . esc_html__( 'or use FTP form to allow ', 'w3-total-cache' ) .
							'<strong>' . esc_html__( 'W3 Total Cache', 'w3-total-cache' ) . '</strong>' .
							esc_html__( 'make it automatically.', 'w3-total-cache' ) .
						'</td>' .
						'<td>' . Util_Ui::button( 'Update via FTP', '', 'w3tc-show-ftp-form button' ) . '</td>' .
					'</tr>' .
					'</table>' .
					'<div class="w3tc-required-changes" style="' . $changes_style . '">' . $r['required_changes'] . '</div>' .
					'<div class="w3tc-ftp-form" style="' . $ftp_style . '">' . $ftp_form . '</div>';

				$environment_error_present = true;
				$errors['generic_ftp']     = $error;
			}

			foreach ( $r['later_errors'] as $e ) {
				$errors[ 'generic_env_' . $n ] = $e;
				$n++;
			}
		}

		$errors = apply_filters( 'w3tc_errors', $errors );
		$notes  = apply_filters( 'w3tc_notes', $notes );

		/**
		 * Show messages.
		 */
		foreach ( $notes as $key => $note ) {
			echo wp_kses(
				sprintf(
					'<div class="updated w3tc_note inline" id="%1$s"><p>%2$s</p></div>',
					esc_attr( $key ),
					$note
				),
				array(
					'div'   => array(
						'class' => array(),
						'id'    => array(),
					),
					'input' => array(
						'class'   => array(),
						'name'    => array(),
						'onclick' => array(),
						'type'    => array(),
						'value'   => array(),
					),
					'p'     => array(),
					'a'     => array(
						'target' => array(),
						'href'   => array(),
						'class'  => array(),
					),
				)
			);
		}

		foreach ( $errors as $key => $error ) {
				printf(
					'<div class="error w3tc_error inline" id="%1$s"><p>%2$s</p></div>',
					esc_attr( $key ),
					$error // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
				);
		}
	}
}