<?php
defined( 'ABSPATH' ) or die( 'you do not have access to this page!' );

if ( ! class_exists( 'cmplz_cookie_blocker' ) ) {
	class cmplz_cookie_blocker {
		private static $_this;
		public $cookie_list         = array();
		public $delete_cookies_list = array();

		function __construct() {
			if ( isset( self::$_this ) ) {
				wp_die(
					sprintf(
						'%s is a singleton class and you cannot create a second instance.',
						get_class( $this )
					)
				);
			}

			add_action( 'rest_api_init', array( $this, 'cmplz_cookie_data_rest_route' ) );
			add_action( 'init', array( $this, 'create_delete_cookies_list' ) );
			add_action( 'send_headers', array( $this, 'delete_cookies' ) );
			self::$_this = $this;
		}

		static function this() {
			return self::$_this;
		}

		/**
		 * Get list of cookies for the cookie shredder
		 *
		 * @return void
		 */
		public function load_cookie_data() {
			if ( cmplz_get_option( 'safe_mode' ) == 1 || cmplz_get_option( 'consent_per_service' ) !== 'yes' ) {
				return;
			}
			$this->cookie_list = cmplz_get_transient( 'cmplz_cookie_shredder_list' );
			if ( ! $this->cookie_list ) {
				$this->cookie_list = array();
				$cookie_list       = COMPLIANZ::$banner_loader->get_cookies(
					array(
						'ignored'       => false,
						'hideEmpty'     => false,
						'language'      => 'en', // only for one language
						'showOnPolicy'  => true,
						'deleted'       => false,
						'isMembersOnly' => cmplz_get_option( 'wp_admin_access_users' ) === 'yes' ? 'all' : false,
					)
				);
				$this->get_cookies( $cookie_list, 'preferences' );
				$this->get_cookies( $cookie_list, 'statistics' );
				$this->get_cookies( $cookie_list, 'marketing' );
				cmplz_set_transient( 'cmplz_cookie_shredder_list', $this->cookie_list, HOUR_IN_SECONDS );
			}
		}

		/**
		 * Create a list of cookies that should be deleted
		 *
		 * @return void
		 */
		public function create_delete_cookies_list() {
			if ( cmplz_get_option( 'safe_mode' ) == 1 || cmplz_get_option( 'consent_per_service' ) !== 'yes' ) {
				return;
			}
			if ( is_admin() ) {
				return;
			}
			$this->load_cookie_data();

			$current_cookies = array_keys( $_COOKIE );
			foreach ( $this->cookie_list as $category => $cookies ) {
				if ( cmplz_has_consent( $category ) ) {
					continue;
				}

				if ( ! is_array( $cookies ) ) {
					continue;
				}

				foreach ( $cookies as $service => $cookie_list ) {
					if ( cmplz_has_service_consent( $service ) ) {
						continue;
					}
					foreach ( $current_cookies as $key => $current_cookie ) {
						$found = cmplz_strpos_arr( $current_cookie, $cookie_list );
						if ( $found ) {
							$this->delete_cookies_list[] = $current_cookie;
						}
					}
				}
			}
			// ensure there are no duplicate arrays
			$this->delete_cookies_list = array_unique( $this->delete_cookies_list );
		}

		/**
		 * Clear cookies on header send
		 *
		 * @return void
		 */
		public function delete_cookies() {
			$max   = 20;
			$count = 0;
			foreach ( $this->delete_cookies_list as $name ) {
				// limit header size by limiting number of cookies to delete in one go.
				if ( $count > $max ) {
					continue;
				}
				++$count;
				unset( $_COOKIE[ $name ] );
				$name = $this->sanitize_cookie_name( $name );
				setcookie( $name, '', -1, COMPLIANZ::$banner_loader->get_cookie_path() );
				setcookie( $name, '', -1, '/' );
			}
		}

		/**
		 * Sanitize cookie name. Remove any characters that are not alphanumeric, underscore, or dash to prevent fatal errors in the setcookie function
		 *
		 * @param string $name
		 *
		 * @return string
		 */
		public function sanitize_cookie_name( string $name ): string {
			// Remove any characters that are not alphanumeric, underscore, or dash
			return preg_replace( '/[^a-zA-Z0-9_-]/', '', $name );
		}

		/**
		 * Add cookie data rest route
		 *
		 * @return void
		 */
		public function cmplz_cookie_data_rest_route() {
			register_rest_route(
				'complianz/v1',
				'cookie_data/',
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'cookie_data' ),
					'permission_callback' => '__return_true',
				)
			);
		}

		/**
		 * Add cookies to list by category
		 *
		 * @param array  $cookie_list
		 * @param string $category
		 *
		 * @return void
		 */
		public function get_cookies( $cookie_list, $category ) {
			if ( is_array( $cookie_list ) ) {
				foreach ( $cookie_list as $cookie ) {
					if ( stripos( (string) $cookie->purpose, $category ) !== false ) {
						$this->cookie_list[ $category ][ $this->sanitize_service_name( $cookie->service ) ][] = str_replace( '*', '', $cookie->name );
					}
				}
			}
		}

		/**
		 * Get a blocked content notice
		 *
		 * @return string
		 */
		public function blocked_content_text() {
			if ( cmplz_get_option( 'consent_per_service' ) === 'yes' ) {
				$agree_text      = cmplz_get_option( 'agree_text_per_service' );
				$placeholdertext = cmplz_get_option( 'blocked_content_text_per_service' );
				$placeholdertext = '<div class="cmplz-blocked-content-notice-body">' . $placeholdertext . '&nbsp;<div class="cmplz-links"><a href="#" class="cmplz-link cookie-statement">{title}</a></div></div><button class="cmplz-accept-service">' . $agree_text . '</button>';
			} else {
				$placeholdertext = cmplz_get_option( 'blocked_content_text' );
			}

			return apply_filters( 'cmplz_accept_cookies_blocked_content', $placeholdertext );
		}


		/**
		 * REST API for cookie data
		 *
		 * @param WP_REST_Request $request
		 */
		public function cookie_data( WP_REST_Request $request ) {
			$this->load_cookie_data();
			$response = json_encode( $this->cookie_list );
			header( 'Content-Type: application/json' );
			echo $response;
			exit;
		}
		/**
		 * Get array of scripts to block in correct format
		 * This is the base array, of which dependencies and placeholder lists also are derived
		 *
		 * @return array
		 */
		public function blocked_styles() {
			$blocked_styles = apply_filters( 'cmplz_known_style_tags', array() );
			// make sure every item has the default array structure
			foreach ( $blocked_styles as $key => $blocked_style ) {
				$default = array(
					'name'               => 'general', // default service name
					'enable_placeholder' => 1,
					'placeholder'        => '',
					'category'           => 'marketing',
					'urls'               => array( $blocked_style ),
					'enable'             => 1,
					'enable_dependency'  => 0,
					'dependency'         => '',
				);

				if ( ! is_array( $blocked_style ) ) {
					$service                = cmplz_get_service_by_src( $blocked_style );
					$default['name']        = $service;
					$default['placeholder'] = $service;
					$blocked_styles[ $key ] = $default;
				} else {
					$blocked_styles[ $key ] = wp_parse_args( $blocked_style, $default );
				}
			}

			$formatted_custom_style_tags = array();
			foreach ( $blocked_styles as $blocked_style ) {
				$blocked_style['name'] = $this->sanitize_service_name( $blocked_style['name'] );
				if ( isset( $blocked_style['urls'] ) ) {
					foreach ( $blocked_style['urls'] as $url ) {
						$formatted_custom_style_tags[ $url ] = $blocked_style;
					}
				} elseif ( isset( $blocked_style['editor'] ) ) {
					$formatted_custom_style_tags[ $blocked_style['editor'] ] = $blocked_style;
				}
			}
			return $formatted_custom_style_tags;
		}
		/**
		 * Get array of scripts to block in correct format
		 * This is the base array, of which dependencies and placeholder lists also are derived
		 *
		 * @return array
		 */
		public function blocked_scripts() {
			$blocked_scripts = apply_filters( 'cmplz_known_script_tags', array() );
			$scripts         = get_option( 'complianz_options_custom-scripts' );
			if ( is_array( $scripts ) && isset( $scripts['block_script'] ) && is_array( $scripts['block_script'] ) ) {
				$custom_script_tags = array_filter(
					$scripts['block_script'],
					function ( $script ) {
						return true === (bool) $script['enable'];
					}
				);
				$blocked_scripts    = array_merge( $blocked_scripts, $custom_script_tags );
			}

			$blocked_scripts = apply_filters_deprecated( 'cmplz_known_iframe_tags', array( $blocked_scripts ), '6.0.0', 'cmplz_known_script_tags', 'The cmplz_known_iframe_tags filter is deprecated' );

			// make sure every item has the default array structure
			foreach ( $blocked_scripts as $key => $blocked_script ) {
				$default = array(
					'name'               => 'general', // default service name
					'enable_placeholder' => 1,
					'placeholder'        => '',
					'category'           => 'marketing',
					'urls'               => array( $blocked_script ),
					'enable'             => 1,
					'enable_dependency'  => 0,
					'dependency'         => '',
				);

				if ( ! is_array( $blocked_script ) ) {
					$service                 = cmplz_get_service_by_src( $blocked_script );
					$default['name']         = $service;
					$default['placeholder']  = $service;
					$blocked_scripts[ $key ] = $default;
				} else {
					$blocked_scripts[ $key ] = wp_parse_args( $blocked_script, $default );
				}
			}

			$formatted_custom_script_tags = array();
			foreach ( $blocked_scripts as $blocked_script ) {
				$blocked_script['name'] = $this->sanitize_service_name( $blocked_script['name'] );
				if ( cmplz_placeholder_disabled( $blocked_script['name'] ) ) {
					$blocked_script['enable_placeholder'] = 0;
				}
				if ( isset( $blocked_script['urls'] ) ) {
					foreach ( $blocked_script['urls'] as $url ) {
						$formatted_custom_script_tags[ $url ] = $blocked_script;
					}
				} elseif ( isset( $blocked_script['editor'] ) ) {
					$formatted_custom_script_tags[ $blocked_script['editor'] ] = $blocked_script;
				}
			}
			return $formatted_custom_script_tags;
		}

		/**
		 * @param $title
		 *
		 * @return array|string|string[]
		 */
		public function sanitize_service_name( $title ) {
			if ( empty( $title ) ) {
				return 'general';
			}
			return cmplz_sanitize_title_preserve_uppercase( $title );
		}

		/**
		 * Get array of placeholder - placeholder_classes for non iframe blocked content
		 *
		 * @param array $blocked_scripts
		 * @return array
		 */
		public function placeholder_markers( $blocked_scripts ) {
			$placeholder_markers = apply_filters( 'cmplz_placeholder_markers', array() );

			// current format: array('facebook' = array('class1','class2') )
			// force into new structure
			foreach ( $placeholder_markers as $name => $placeholders ) {
				foreach ( $placeholders as $class ) {
					$name              = $this->sanitize_service_name( $name );
					$blocked_scripts[] = array(
						'name'               => $name,
						'placeholder'        => $name,
						'placeholder_class'  => $class,
						'category'           => 'marketing',
						'enable_placeholder' => 1,
						'iframe'             => 0,
					);
				}
			}

			// add script center data. add_script arrays aren't included in the "known_script_tags" function
			$scripts = get_option( 'complianz_options_custom-scripts' );
			if ( is_array( $scripts ) && isset( $scripts['add_script'] ) && is_array( $scripts['add_script'] ) ) {
				$added_scripts = array_filter(
					$scripts['add_script'],
					static function ( $script ) {
						return true === (bool) $script['enable'];
					}
				);
				if ( ! empty( $added_scripts ) ) {
					$blocked_scripts = array_merge( $blocked_scripts, $added_scripts );
				}
			}

			// filter out non-iframe and disabled placeholders.
			// 'add_script' items do not have an iframe
			return array_filter(
				$blocked_scripts,
				static function ( $script ) {
					return isset( $script['enable_placeholder'] ) && $script['enable_placeholder'] == 1 && ( ! isset( $script['iframe'] ) || $script['iframe'] == 0 ) && ! empty( $script['placeholder_class'] );
				}
			);
		}

		/**
		 * Get dependencies and merge with dependencies from the script center
		 *
		 * @param array $blocked_scripts
		 * @return array
		 */
		function dependencies( $blocked_scripts ) {
			// array['wait-for-this-script'] = 'script-that-should-wait';
			$dependencies = apply_filters( 'cmplz_dependencies', array() );
			$scripts      = get_option( 'complianz_options_custom-scripts' );
			if ( is_array( $scripts ) && isset( $scripts['block_script'] ) && is_array( $scripts['block_script'] ) ) {
				$added_scripts   = array_filter(
					$scripts['block_script'],
					function ( $script ) {
						return true === (bool) $script['enable'];
					}
				);
				$blocked_scripts = array_merge( $blocked_scripts, $added_scripts );
			}
			$blocked_scripts = array_filter(
				$blocked_scripts,
				function ( $script ) {
					return isset( $script['enable_dependency'] ) && $script['enable_dependency'] == 1 && ! empty( $script['dependency'] );
				}
			);

			$flat = array();
			foreach ( $blocked_scripts as $data ) {
				$flat = array_merge( $flat, $data['dependency'] );
			}
			return array_merge( $dependencies, $flat );
		}

		/**
		 * Get array of whitelisted scripts, and add flattened scriptcenter whitelist
		 *
		 * @return array
		 */
		public function whitelisted_scripts() {
			// whitelist our localized inline scripts
			$whitelisted_script_tags = apply_filters( 'cmplz_whitelisted_script_tags', array( 'user_banner_id' ) );
			$scripts                 = get_option( 'complianz_options_custom-scripts' );
			if ( is_array( $scripts ) && isset( $scripts['whitelist_script'] ) && is_array( $scripts['whitelist_script'] ) ) {
				$custom_whitelisted_script_tags = array_filter(
					$scripts['whitelist_script'],
					function ( $script ) {
						return true === (bool) $script['enable'];
					}
				);

				// flatten array
				$flat = array();
				foreach ( $custom_whitelisted_script_tags as $data ) {
					$flat = array_merge( $flat, $data['urls'] );
				}

				$whitelisted_script_tags = array_merge( $flat, $whitelisted_script_tags );
			}
			return $whitelisted_script_tags;
		}

		/**
		 * Apply the mixed content fixer.
		 *
		 * @since  1.0
		 *
		 * @access public
		 */
		public function filter_buffer( $buffer ) {
			if ( cmplz_is_amp() ) {
				$buffer = apply_filters( 'cmplz_cookieblocker_amp', $buffer );
			} else {
				$buffer = $this->replace_tags( $buffer );
			}

			return $buffer;
		}

		/**
		 * Start buffering the output
		 *
		 * @since  1.0
		 *
		 * @access public
		 */
		public function start_buffer() {
			/**
			 * Don't activate the cookie blocker is AMP is active, but the AMP integration is not enabled
			 * This problem only occurs for manually included iframes, not for WP generated embeds
			 */

			if ( cmplz_is_amp_endpoint() && ! cmplz_amp_integration_active() ) {
				return;
			}

			ob_start( array( $this, 'filter_buffer' ) );
		}

		/**
		 * Flush the output buffer
		 *
		 * @since  1.0
		 *
		 * @access public
		 */
		public function end_buffer() {

			/**
			 * Don't activate the cookie blocker is AMP is active, but the AMP integration is not enabled
			 */

			if ( cmplz_is_amp_endpoint() && ! cmplz_amp_integration_active() ) {
				return;
			}

			if ( ob_get_length() ) {
				ob_end_flush();
			}
		}

		/**
		 * Just before the page is sent to the visitor's browser, remove all tracked third party scripts
		 *
		 * @since  1.0
		 *
		 * @access public
		 */
		public function replace_tags( $output ) {
			/**
			 * Get style tags
			 * */
			$known_style_tags = $this->blocked_styles();

			/**
			 * Get script tags, including custom user scripts
			 * */
			$blocked_scripts = cmplz_get_transient( 'cmplz_blocked_scripts' );
			if ( isset( $_GET['cmplz_nocache'] ) ) {
				$blocked_scripts = false;
			}

			if ( ! $blocked_scripts ) {
				$blocked_scripts = $this->blocked_scripts();
				cmplz_set_transient( 'cmplz_blocked_scripts', $blocked_scripts, 30 * MINUTE_IN_SECONDS );
			}

			/**
			 * Get placeholder markers for non iframe blocked content
			 */

			$placeholder_markers = $this->placeholder_markers( $blocked_scripts );

			/**
			 * Get whitelisted script tags
			 * */
			$whitelisted_script_tags = $this->whitelisted_scripts();

			/**
			 * Get dependencies between scripts
			 * */
			$dependencies = $this->dependencies( $blocked_scripts );

			/**
			 * Get list of tags that require post scribe to be enabled on the page. Currently only for instawidget.js
			 * */

			$post_scribe_list = apply_filters( 'cmplz_post_scribe_tags', array() );

			// not meant as a "real" URL pattern, just a loose match for URL type strings.
			// edit: instagram uses ;width, so we need to allow ; as well.
			$url_pattern = '([\w.,;ß@?^=%&:()\/~+#!\-*]*?)';

			/**
			 * Handle images from third party services, e.g. google maps
			 * */
			$image_tags    = apply_filters( 'cmplz_image_tags', array() );
			$image_pattern = '/<img.*?src=[\'|"](\X*?)[\'|"].*?>/s'; // matches multiline with s operator, for FB pixel
			if ( preg_match_all( $image_pattern, $output, $matches, PREG_PATTERN_ORDER )
			) {
				foreach ( $matches[1] as $key => $image_url ) {
					$total_match = $matches[0][ $key ];
					$found       = cmplz_strpos_arr( $image_url, $image_tags );
					if ( $found !== false ) {
						$placeholder  = cmplz_placeholder( false, $image_url );
						$service_name = cmplz_get_service_by_src( $image_url );
						$service_name = ! $service_name ? 'general' : $service_name;
						$new          = $total_match;
						$new          = $this->add_data( $new, 'img', 'src-cmplz', $image_url );
						$new          = $this->add_data( $new, 'img', 'service', $service_name );
						$new          = $this->add_data( $new, 'img', 'category', 'marketing' );
						// remove lazy loading for images, as it is breaking on activation
						$new = str_replace( 'loading="lazy"', 'data-deferlazy="1"', $new );
						$new = $this->add_class( $new, 'img', apply_filters( 'cmplz_image_class', 'cmplz-image', $total_match, $found ) );
						$new = $this->replace_src( $new, apply_filters( 'cmplz_source_placeholder', $placeholder ) );
						$new = apply_filters( 'cmplz_image_html', $new, $image_url );

						if ( cmplz_use_placeholder( $image_url ) ) {
							$new = $this->add_class( $new, 'img', ' cmplz-placeholder-element ' );
							$new = '<div class="cmplz-placeholder-parent">' . $new . '</div>';
						}
						$output = str_replace( $total_match, $new, $output );
					}
				}
			}

			/**
			 * Handle styles (e.g. google fonts)
			 * */
			$style_pattern = '/<link.*?rel=[\'|"]stylesheet[\'|"][^>].*?href=[\'|"](\X*?)[\'|"][^>]*?>/i';
			if ( preg_match_all( $style_pattern, $output, $matches, PREG_PATTERN_ORDER ) ) {
				foreach ( $matches[1] as $key => $style_url ) {
					$total_match = $matches[0][ $key ];
					// we don't block scripts with the functional data attribute
					if ( strpos( $total_match, 'data-category="functional"' ) !== false ) {
						continue;
					}

					// check if we can skip blocking this array if a specific string is included
					if ( cmplz_strpos_arr( $total_match, $whitelisted_script_tags ) ) {
						continue;
					}
					$found = cmplz_strpos_arr( $style_url, array_keys( $known_style_tags ) );
					if ( $found !== false ) {
						$match        = $known_style_tags[ $found ];
						$new          = $total_match;
						$service_name = $this->sanitize_service_name( $match['name'] );
						$new          = $this->add_data( $new, 'link', 'category', apply_filters( 'cmplz_service_category', $match['category'], $total_match, $found ) );
						$new          = $this->add_data( $new, 'link', 'service', $service_name );
						$new          = $this->replace_href( $new );
						$output       = str_replace( $total_match, $new, $output );
					}
				}
			}

			/**
			 * Handle iframes from third parties
			 * */
			// the iframes URL pattern allows for a space, which may be included in a Google Maps embed.
			$iframe_pattern = '/<(iframe)[^>].*?src=[\'"](.*?)[\'"].*?>.*?<\/iframe>/is';
			if ( preg_match_all( $iframe_pattern, $output, $matches, PREG_PATTERN_ORDER ) ) {
				foreach ( $matches[0] as $key => $total_match ) {
					$iframe_src = $matches[2][ $key ];
					if ( ( $tag_key = cmplz_strpos_arr( $iframe_src, array_keys( $blocked_scripts ) ) ) !== false ) {
						$tag = $blocked_scripts[ $tag_key ];
						if ( $tag['category'] === 'functional' ) {
							continue;
						}

						$is_video     = $this->is_video( $iframe_src );
						$service_name = $this->sanitize_service_name( $tag['name'] );
						$new          = $total_match;
						$new          = preg_replace( '~<iframe\\s~i', '<iframe data-cmplz-target="' . apply_filters( 'cmplz_data_target', 'src', $total_match ) . '" data-src-cmplz="' . $iframe_src . '" ', $new, 1 ); // make sure we replace it only once

						// remove lazy loading for iframes, as it is breaking on activation
						$new = str_replace( 'loading="lazy"', 'data-deferlazy="1"', $new );
						// check if we can skip blocking this array if a specific string is included
						if ( cmplz_strpos_arr( $total_match, $whitelisted_script_tags ) ) {
							continue;
						}
						// we insert video/no-video class for specific video styling
						$video_class = $is_video ? 'cmplz-video' : 'cmplz-no-video';
						$video_class = apply_filters( 'cmplz_video_class', $video_class );

						$new = $this->replace_src( $new, apply_filters( 'cmplz_source_placeholder', 'about:blank' ) );
						$new = $this->add_class( $new, 'iframe', "cmplz-iframe cmplz-iframe-styles $video_class " );
						$new = $this->add_data( $new, 'iframe', 'service', $service_name );
						$new = $this->add_data( $new, 'iframe', 'category', $tag['category'] );

						if ( cmplz_use_placeholder( $iframe_src ) ) {
							$placeholder = cmplz_placeholder( $tag['placeholder'], $iframe_src );
							$new         = $this->add_class( $new, 'iframe', 'cmplz-placeholder-element' );
							$new         = $this->add_data( $new, 'iframe', 'placeholder-image', $placeholder );
							// allow for integrations to override html
							$new = apply_filters( 'cmplz_iframe_html', $new );

							// make sure there is a parent element which contains this iframe only, to attach the placeholder to
							if ( ! $is_video
								&& ! $this->no_div( $iframe_src )
							) {
								$new = '<div class="cmplz-placeholder-parent">' . $new . '</div>';
							}
						}
						$output = str_replace( $total_match, $new, $output );
					}
				}
			}

			/**
			 * specific classic wp video shortcode integration
			 */
			if ( cmplz_uses_thirdparty( 'youtube' ) || cmplz_uses_thirdparty( 'vimeo' ) ) {
				$iframe_pattern = '/<video class="wp-video-shortcode".*?<(source) type="video.*?src="(.*?)".*?>.*?<\/video>/is';
				if ( preg_match_all( $iframe_pattern, $output, $matches, PREG_PATTERN_ORDER ) ) {
					foreach ( $matches[0] as $key => $total_match ) {
						$iframe_src = $matches[2][ $key ];
						if ( ( $tag_key = cmplz_strpos_arr( $iframe_src, array_keys( $blocked_scripts ) ) ) !== false ) {
							$tag = $blocked_scripts[ $tag_key ];
							if ( $tag['category'] === 'functional' ) {
								continue;
							}
							$service_name = sanitize_title( $tag['name'] );
							$new          = $total_match;
							// check if we can skip blocking this array if a specific string is included
							if ( cmplz_strpos_arr( $total_match, $whitelisted_script_tags ) ) {
								continue;
							}
							// we add an additional class to make it possible to link some css to the blocked html.
							$video_class_pattern = '/(["| ])(wp-video)(["| ])/is';
							$output              = preg_replace( $video_class_pattern, '$1wp-video cmplz-wp-video$3', $output );

							$video_class = apply_filters( 'cmplz_video_class', 'cmplz-video' );
							$new         = $this->add_class( $new, 'video', " $video_class " );
							$new         = $this->add_data( $new, 'video', 'service', $service_name );
							$new         = $this->add_data( $new, 'video', 'category', $tag['category'] );
							$new         = str_replace( array( 'wp-video-shortcode', 'controls="controls"' ), array( 'cmplz-wp-video-shortcode', '' ), $new );
							if ( cmplz_use_placeholder( $iframe_src ) ) {
								$placeholder = cmplz_placeholder( $tag['placeholder'], $iframe_src );
								$new         = $this->add_class( $new, 'video', 'cmplz-placeholder-element' );
								$new         = $this->add_data( $new, 'video', 'placeholder-image', $placeholder );
								// allow for integrations to override html
								$new = apply_filters( 'cmplz_source_html', $new );
							}

							$output = str_replace( $total_match, $new, $output );
						}
					}
				}
			}

			/**
			 * set non iframe placeholders
			 * */
			if ( cmplz_use_placeholder() ) {
				foreach ( $placeholder_markers as $placeholder ) {
					// placeholder class can be comma separated list e.g. facebook service integration
					$classes = array_map( 'trim', explode( ',', $placeholder['placeholder_class'] ) );
					foreach ( $classes as $placeholder_class ) {
						$placeholder_pattern = '/<([a-zA-Z][a-zA-Z0-9-]*)[^>]*(id|class)=[\'" ]*[^>]*(' . $placeholder_class . ')[\'" ].*?>/is';
						if ( preg_match_all( $placeholder_pattern, $output, $matches, PREG_PATTERN_ORDER ) ) {
							foreach ( $matches[0] as $key => $html_match ) {
								$el = $matches[1][ $key ];
								if ( ! empty( $el ) ) {
									$type     = $placeholder['placeholder'];
									$new_html = $this->add_data( $html_match, $el, 'placeholder-image', cmplz_placeholder( $type, $placeholder_class ) );
									$new_html = $this->add_data( $new_html, $el, 'category', $placeholder['category'] );
									$new_html = $this->add_data( $new_html, $el, 'service', $placeholder['name'] );
									$new_html = $this->add_class( $new_html, $el, 'cmplz-placeholder-element' );
									$output   = str_replace( $html_match, $new_html, $output );
								}
							}
						}
					}
				}
			}

			/**
			 * Handle scripts from third parties
			 * */
			$script_pattern = '/(<script.*?>)(\X*?)<\/script>/is';
			$index          = 0;
			if ( preg_match_all( $script_pattern, $output, $matches, PREG_PATTERN_ORDER ) ) {
				foreach ( $matches[1] as $key => $script_open ) {
					// we don't block scripts with the functional data attribute
					if ( strpos( $script_open, 'data-category="functional"' ) !== false ) {
						continue;
					}

					// exclude ld+json
					if ( strpos( $script_open, 'application/ld+json' ) !== false ) {
						continue;
					}

					// check if we can skip blocking this array if a specific string is included
					$total_match = $matches[0][ $key ];
					$content     = $matches[2][ $key ];
					if ( cmplz_strpos_arr( $total_match, $whitelisted_script_tags ) ) {
						continue;
					}

					// if there is inline script here, it has some content
					if ( ! empty( $content ) ) {
						if ( strpos( $content, 'avia_preview' ) !== false ) {
							continue;
						}

						$found = cmplz_strpos_arr( $content, array_keys( $blocked_scripts ) );
						if ( $found !== false ) {

							$match        = $blocked_scripts[ $found ];
							$service_name = $this->sanitize_service_name( $match['name'] );
							$new          = $total_match;
							$category     = apply_filters_deprecated( 'cmplz_script_class', array( $match['category'], $total_match, $found ), '6.0.0', 'cmplz_service_category', 'The cmplz_script_class filter has been deprecated since 6.0' );
							$category     = apply_filters( 'cmplz_service_category', $category, $total_match, $found );

							// skip if functional
							if ( $category === 'functional' ) {
								continue;
							}

							$new     = $this->add_data( $new, 'script', 'category', $category );
							$new     = $this->add_data( $new, 'script', 'service', $service_name );
							$new     = $this->set_javascript_to_plain( $new );
							$waitfor = cmplz_strpos_arr( $content, $dependencies );
							if ( $waitfor !== false ) {
								$new = $this->add_data( $new, 'script', 'waitfor', $waitfor );
							}

							$output = str_replace( $total_match, $new, $output );
						}
					}

					// when script contains src
					$script_src_pattern = '/<script[^>]*?src=[\'"]' . $url_pattern . '[\'"].*?>/is';
					if ( preg_match_all( $script_src_pattern, $total_match, $src_matches, PREG_PATTERN_ORDER ) ) {
						foreach ( $src_matches[1] as $src_key => $script_src ) {
							$script_src = $src_matches[1][ $src_key ];
							$found      = cmplz_strpos_arr( $script_src, array_keys( $blocked_scripts ) );
							if ( $found !== false ) {
								$match        = $blocked_scripts[ $found ];
								$new          = $total_match;
								$service_name = $this->sanitize_service_name( $match['name'] );
								$category     = apply_filters_deprecated( 'cmplz_script_class', array( $match['category'], $total_match, $found ), '6.0.0', 'cmplz_service_category', 'The cmplz_script_class filter has been deprecated since 6.0' );
								$new          = $this->add_data( $new, 'script', 'category', apply_filters( 'cmplz_service_category', $category, $total_match, $found ) );
								$new          = $this->add_data( $new, 'script', 'service', $service_name );
								// native scripts don't have to be blocked
								if ( strpos( $new, 'data-category="functional"' ) === false
								) {
									$new = $this->set_javascript_to_plain( $new );
									$new = str_replace( 'src=', 'data-cmplz-src=', $new );

									if ( cmplz_strpos_arr( $found, $post_scribe_list )
									) {
										// will be to late for the first page load, but will enable post scribe on next page load
										if ( ! get_option( 'cmplz_post_scribe_required' ) ) {
											update_option( 'cmplz_post_scribe_required', true );
										}
										++$index;
										$new  = $this->add_data( $new, 'script', 'post_scribe_id', 'cmplz-ps-' . $index );
										$new .= '<div class="cmplz-blocked-content-container">'
												. COMPLIANZ::$cookie_blocker->blocked_content_text()
												. '<div id="cmplz-ps-' . $index . '"><img src="' . cmplz_placeholder( 'div' ) . '"></div></div>';

									}

									// maybe add dependency
									$waitfor = cmplz_strpos_arr( $script_src, $dependencies );
									if ( $waitfor !== false ) {
										$new = $this->add_data( $new, 'script', 'waitfor', $waitfor );
									}
								}

								$output = str_replace( $total_match, $new, $output );
							}
						}
					}
				}
			}

			// add a marker so we can recognize if this function is active on the front-end
			$id = 1;
			if ( cmplz_get_option( 'consent_per_service' ) === 'yes' ) {
				$id = 2;
			}
			$output = str_replace( '<body ', "<body data-cmplz=$id ", $output );

			return apply_filters( 'cmplz_cookie_blocker_output', $output );
		}

		/**
		 * Set the javascript attribute of a script element to plain
		 *
		 * @param string $script
		 *
		 * @return string
		 */
		private function set_javascript_to_plain( string $script ): string {
			// check if it's already set to plain
			if ( strpos( $script, 'text/plain' ) !== false ) {
				return $script;
			}

			// Check text/javascript
			$pattern = '/<script[^>].*?\K(type=[\'|\"]text\/javascript[\'|\"])(?=.*>)/i';
			preg_match( $pattern, $script, $matches );
			if ( $matches ) {
				return preg_replace( $pattern, 'type="text/plain"', $script, 1 );
			}

			// Check type="module"
			$pattern_module = '/(<script[^>]*?)(type=[\'|\"]module[\'|\"])([^>]*?>)/i';
			preg_match( $pattern_module, $script, $matches_module );
			if ( $matches_module ) {
				return preg_replace( $pattern_module, '$1 type="text/plain" data-script-type="module" $3', $script, 1 );
			}

			$pos = strpos( $script, '<script' );
			if ( $pos !== false ) {
				return substr_replace( $script, '<script type="text/plain"', $pos, strlen( '<script' ) );
			}

			return $script;
		}

		/**
		 * replace the src attribute with a placeholder of choice
		 *
		 * @param string $script
		 * @param string $new_src
		 *
		 * @return string
		 */
		private function replace_src( $script, $new_src ) {

			$pattern = '/src=[\'"](http:\/\/|https:\/\/|\/\/)([\s\wêëèéēėęàáâæãåāäöôòóœøüÄÖÜß.,@!?^=%&:\/~+#-;]*[\w@!?^=%&\/~+#-;]?)[\'"]/i';
			$new_src = ' src="' . $new_src . '" ';
			preg_match( $pattern, $script, $matches );
			$script = preg_replace( $pattern, $new_src, $script );

			return $script;
		}

		/**
		 * replace the href attribute with a data-href attribute
		 *
		 * @param string $link
		 *
		 * @return string
		 */
		private function replace_href( $link ) {
			return str_replace( 'href=', 'data-href=', $link );
		}

		/**
		 * Add a class to an HTML element
		 *
		 * @param string $html
		 * @param string $el
		 * @param string $class
		 *
		 * @return string
		 */
		public function add_class( $html, $el, $class ) {
			$classes = array_filter( explode( ' ', $class ) );
			preg_match( '/<' . preg_quote( $el, '/' ) . '[^\>]*[^\>\S]+\K(class=")(.*)"/i', $html, $matches );
			if ( $matches ) {
				foreach ( $classes as $class ) {
					// check if class is already added
					if ( strpos( $matches[2], $class ) === false && strlen( trim( $class ) ) > 0 ) {
						$html = preg_replace( '/<' . preg_quote( $el, '/' ) . '[^\>]*[^\>\S]+\K(class=")/i', 'class="' . esc_attr( $class ) . ' ', $html, 1 );
					}
				}
			} else {
				$pos = strpos( $html, "<$el" );
				if ( $pos !== false ) {
					$html = substr_replace(
						$html,
						'<' . $el . ' class="' . esc_attr( $class ) . '"',
						$pos,
						strlen( "<$el" )
					);
				}
			}

			return $html;
		}

		/**
		 * Add a data attribute to an html element
		 *
		 * @param string $html
		 * @param string $el
		 * @param string $id
		 * @param string $content
		 *
		 * @return string $html
		 */
		public function add_data( $html, $el, $id, $content ) {
			$content = esc_attr( $content );
			$id      = esc_attr( $id );
			$pattern = '/<' . preg_quote( $el, '/' ) . '[^>].*?\K(data-' . preg_quote( $id, '/' ) . '=[\'|\"]' . preg_quote( $content, '/' ) . '[\'|\"])(?=.*>)/i';
			preg_match( $pattern, $html, $matches );
			if ( ! $matches ) {
				$pos = strpos( $html, "<$el" );
				if ( $pos !== false ) {
					$html = substr_replace( $html, '<' . $el . ' data-' . $id . '="' . $content . '"', $pos, strlen( "<$el" ) );
				}
			}

			return $html;
		}

		/**
		 * Check if this iframe source is a video
		 *
		 * @param $iframe_src
		 *
		 * @return bool
		 */
		private function is_video( $iframe_src ) {
			if ( strpos( $iframe_src, 'dailymotion' ) !== false
				|| strpos( $iframe_src, 'youtube' ) !== false
				|| strpos( $iframe_src, 'vimeo' ) !== false
			) {
				return true;
			}

			return false;
		}

		/**
		 * Check if this iframe source is soundcloud
		 *
		 * @param $iframe_src
		 *
		 * @return bool
		 */
		private function no_div( $iframe_src ) {
			if ( strpos( $iframe_src, 'soundcloud' ) !== false ) {
				return true;
			}

			return false;
		}
	}
}