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<?php

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namespace Smush\Core\Webp;

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use Smush\Core\CDN\CDN_Helper;

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use Smush\Core\Parser\Element;

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use Smush\Core\Parser\Element_Attribute;

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use Smush\Core\Parser\Element_CSS_Property;

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use Smush\Core\Parser\Image_URL;

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use Smush\Core\Parser\Page;

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use Smush\Core\Server_Utils;

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use Smush\Core\Settings;

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use Smush\Core\Transform\Transform;

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class Webp_Transform implements Transform {

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/**

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* @var Webp_Helper

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private $webp_helper;

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/**

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* @var Server_Utils

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private $server_utils;

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/**

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* @var CDN_Helper

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private $cdn_helper;

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/**

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* @var Settings

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private $settings;

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/**

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* @var Webp_Configuration

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private $configuration;

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public function __construct() {

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$this->webp_helper = new Webp_Helper();

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$this->server_utils = new Server_Utils();

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$this->cdn_helper = CDN_Helper::get_instance();

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$this->settings = Settings::get_instance();

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$this->configuration = Webp_Configuration::get_instance();

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}

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public function should_transform() {

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$is_cdn_active = $this->settings->is_cdn_active(); // CDN takes precedence because it handles webp anyway

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$is_webp_active = $this->settings->is_webp_module_active();

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$direct_conversion_enabled = $this->configuration->direct_conversion_enabled();

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return ! $is_cdn_active && $is_webp_active && $direct_conversion_enabled;

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}

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/**

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* @param $page Page

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* @return void

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public function transform_page( $page ) {

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foreach ( $page->get_styles() as $style ) {

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$this->update_image_urls( $style->get_image_urls() );

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}

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foreach ( $page->get_composite_elements() as $composite_element ) {

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$this->transform_elements( $composite_element->get_elements() );

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}

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$this->transform_elements( $page->get_elements() );

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}

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private function add_fallback_attribute( Element $element ) {

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$fallback_values = array();

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foreach ( $element->get_image_attributes() as $fallback_attribute ) {

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if ( $fallback_attribute->has_updates() ) {

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$fallback_values[ $fallback_attribute->get_name() ] = $fallback_attribute->get_value();

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}

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}

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$background_property = $element->get_background_css_property();

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if ( $background_property && $background_property->has_updates() ) {

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$property_key = str_replace( 'background', 'bg', $background_property->get_property() );

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$fallback_values[ $property_key ] = $background_property->get_value();

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}

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if ( ! empty( $fallback_values ) ) {

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$element->add_attribute( new Element_Attribute( 'data-smush-webp-fallback', json_encode( $fallback_values ) ) );

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}

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}

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/**

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* @param Element $element

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* @return void

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private function transform_image_element_attributes( $element ) {

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foreach ( $element->get_image_attributes() as $attribute ) {

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$this->update_image_urls( $attribute->get_image_urls() );

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}

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}

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/**

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* @param Element $element

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* @return void

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private function transform_image_element_css_properties( $element ) {

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foreach ( $element->get_css_properties() as $css_property ) {

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$this->update_image_urls( $css_property->get_image_urls() );

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}

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}

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/**

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* @param $image_urls Image_URL[]

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private function update_image_urls( $image_urls ) {

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foreach ( $image_urls as $image_url ) {

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$image_url_original = $image_url->get_absolute_url();

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$image_url_webp = $this->webp_helper->get_webp_file_url( $image_url_original );

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// TODO: find a way to convert the URL back to a relative one so multidomain sites will work

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if ( $image_url_webp ) {

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$image_url->set_url( $image_url_webp );

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}

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}

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}

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public function transform_image_url( $url ) {

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$webp_url = $this->webp_helper->get_webp_file_url( $url );

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return $webp_url ? $webp_url : $url;

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}

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/**

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* @param Element $element

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* @return void

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private function transform_element( Element $element ) {

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$this->transform_image_element_attributes( $element );

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$this->transform_image_element_css_properties( $element );

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if ( $this->settings->is_webp_fallback_active() ) {

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$this->add_fallback_attribute( $element );

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}

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}

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/**

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* @param array $elements

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* @return void

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private function transform_elements( array $elements ) {

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foreach ( $elements as $element ) {

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$this->transform_element( $element );

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}

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}

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}

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