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<?php

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namespace Smush\Core\CDN;

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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\Image_URL;

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use Smush\Core\Parser\Style;

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use Smush\Core\Settings;

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use Smush\Core\Transform\Transform;

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class CDN_Transform implements Transform {

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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|null

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private $settings;

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/**

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* @var CDN_Srcset_Controller

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private $cdn_srcset;

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public function __construct() {

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

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$this->cdn_srcset = CDN_Srcset_Controller::get_instance();

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

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}

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public function should_transform() {

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if ( ! $this->cdn_helper->is_cdn_active() ) {

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return false;

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}

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if ( $this->is_rest_request() ) {

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return $this->settings->get( 'rest_api_support' );

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}

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return true;

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}

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public function transform_page( $page ) {

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

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$this->transform_style( $style );

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}

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}

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private function transform_element( $element ) {

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$this->update_element_attributes( $element );

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if ( $this->settings->get( 'background_images' ) ) {

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$this->update_element_background( $element );

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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 update_element_attributes( $element ) {

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$img_url = $this->get_main_image_url( $element );

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if ( empty( $img_url ) ) {

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return;

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}

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$image_markup = $element->get_markup();

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if ( $this->cdn_helper->skip_image( $img_url, $image_markup ) ) {

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return;

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}

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if ( $element->is_image_element() ) {

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$this->update_img_element_attributes( $element );

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} else {

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$this->update_other_element_attributes( $element );

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}

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}

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private function get_main_image_url( $element ) {

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$src_attribute = $element->get_attribute( 'src' );

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if ( $src_attribute && $src_attribute->get_single_image_url() ) {

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return $src_attribute->get_single_image_url()->get_absolute_url();

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}

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

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if ( $attribute->get_single_image_url() ) {

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return $attribute->get_single_image_url()->get_absolute_url();

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}

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}

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return '';

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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 update_other_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(), $element->get_markup() );

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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 update_img_element_attributes( $element ) {

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$image_markup = $element->get_markup();

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$this->update_alternate_attributes( $element, $image_markup );

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$src_attribute = $element->get_attribute( 'src' );

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if ( ! $src_attribute ) {

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return;

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}

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$src_image_url = $src_attribute->get_single_image_url();

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if ( empty( $src_image_url ) ) {

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return;

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}

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$src_url = $src_image_url->get_absolute_url();

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$updated_src_url = $this->filter_before_process( $src_url, $image_markup );

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if ( $this->cdn_helper->is_supported_url( $updated_src_url ) ) {

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$updated_src_url = $this->process_url( $updated_src_url, $image_markup );

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$src_image_url->set_url( $updated_src_url );

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$this->update_img_element_srcset_attribute( $element, $src_url );

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}

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}

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private function process_url( $url, $image, $resizing = false ) {

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$args = array();

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if ( $resizing && $this->settings->get( 'auto_resize' ) ) {

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$dimensions = $this->cdn_helper->guess_dimensions_from_image_markup( $image );

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if ( $dimensions ) {

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$args['size'] = $dimensions;

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}

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}

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/**

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* Filter hook to alter image src arguments before going through cdn.

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* @param array $args Arguments.

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* @param string $url Image src.

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* @param string $image Image tag.

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$args = apply_filters( 'smush_image_cdn_args', $args, $image );

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/**

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* Filter hook to alter image src before going through cdn.

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* @param string $url Image src.

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* @param string $image Image tag.

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$url = apply_filters( 'smush_image_src_before_cdn', $url, $image );

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// Generate cdn url from local url.

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$url = $this->cdn_helper->generate_cdn_url( $url, $args );

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/**

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* Filter hook to alter image src after replacing with CDN base.

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* @param string $url Image src.

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* @param string $image Image tag.

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return apply_filters( 'smush_image_src_after_cdn', $url, $image );

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}

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/**

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* @param $srcset Element_Attribute

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* @return boolean

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private function srcset_attribute_already_updated( $srcset ) {

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return strpos( $srcset->get_value(), 'smushcdn.com' ) !== false;

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}

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/**

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* @param Element $element

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* @param $src_url

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* @return void

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private function update_img_element_srcset_attribute( $element, $src_url ) {

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$srcset_attribute = $element->get_attribute( 'srcset' );

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$already_updated = $srcset_attribute && $this->srcset_attribute_already_updated( $srcset_attribute );

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if ( $already_updated ) {

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return;

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}

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$should_auto_resize = $this->settings->get( 'auto_resize' );

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$element_markup = $element->get_markup();

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$skip_adding_srcset = apply_filters( 'smush_skip_adding_srcset', false, $src_url, $element_markup );

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if ( $should_auto_resize && ! $skip_adding_srcset ) {

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$this->generate_and_use_fresh_srcset( $src_url, $element );

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} elseif ( $srcset_attribute ) {

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$this->update_image_urls( $srcset_attribute->get_image_urls(), $element_markup );

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}

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}

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/**

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* @param $src_url

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* @param Element $element

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* @return void

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private function generate_and_use_fresh_srcset( $src_url, $element ) {

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list( $srcset, $sizes ) = $this->cdn_srcset->generate_srcset( $src_url );

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if ( $srcset ) {

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$new_srcset_attribute = new Element_Attribute( 'srcset', $srcset );

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$element->add_or_update_attribute( $new_srcset_attribute );

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}

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if ( $sizes ) {

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$new_sizes_attribute = new Element_Attribute( 'sizes', $sizes );

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$element->add_or_update_attribute( $new_sizes_attribute );

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}

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}

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/**

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* @param Element $element

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* @param $image_markup

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* @return void

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private function update_alternate_attributes( $element, $image_markup ) {

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

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if ( in_array( $alternate_attribute->get_name(), array( 'src', 'srcset' ) ) ) {

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// src and srcset are handled separately

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continue;

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}

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foreach ( $alternate_attribute->get_image_urls() as $alternate_url ) {

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$alternate_url_string = $alternate_url->get_absolute_url();

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if ( $this->cdn_helper->is_supported_url( $alternate_url_string ) ) {

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$updated = $this->process_url( $alternate_url_string, $image_markup );

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$alternate_url->set_url( $updated );

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}

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}

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}

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}

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private function filter_before_process( $src_url, $image_markup ) {

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/**

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* Filter hook to alter image src at the earliest.

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* @param string $src_url Image src.

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* @param string $image_markup Image tag.

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return apply_filters( 'wp_smush_cdn_before_process_src', $src_url, $image_markup );

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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 update_element_background( $element ) {

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

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foreach ( $css_property->get_image_urls() as $image_url ) {

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$image_url_string = $image_url->get_absolute_url();

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$element_markup = $element->get_markup();

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if ( $this->skip_background_image( $image_url_string, $element_markup ) ) {

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continue;

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}

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$image_url_string = $this->filter_background_url_before_process( $image_url_string, $element_markup );

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if ( $this->cdn_helper->is_supported_url( $image_url_string ) ) {

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// TODO: resizing argument is set to true but this needs to be checked again

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$image_url->set_url( $this->process_url( $image_url_string, $element_markup, true ) );

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}

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}

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}

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}

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/**

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* @param string $image_url_string

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* @param string $element_markup

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* @return bool

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private function skip_background_image( $image_url_string, $element_markup ) {

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/**

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* Filter to skip a single image from cdn.

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* @param bool $skip Should skip? Default: false.

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* @param string $image_url_string Image url.

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* @param array|bool $element_markup Image tag or false.

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return apply_filters( 'smush_skip_background_image_from_cdn', false, $image_url_string, $element_markup );

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}

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/**

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* @param $image_url_string

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* @param $element_markup

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* @return mixed|null

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private function filter_background_url_before_process( $image_url_string, $element_markup ) {

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/**

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* Filter hook to alter background image src at the earliest.

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* @param string $image_url_string Image src.

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* @param string $element_markup Image tag.

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return apply_filters( 'smush_cdn_before_process_background_src', $image_url_string, $element_markup );

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}

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/**

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* @param Style $style

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* @return void

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private function transform_style( $style ) {

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foreach ( $style->get_image_urls() as $image_url ) {

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$image_url_string = $image_url->get_absolute_url();

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if ( $this->cdn_helper->is_supported_url( $image_url_string ) ) {

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$image_url->set_url( $this->cdn_helper->generate_cdn_url( $image_url_string ) );

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}

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}

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}

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/**

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* @param Image_URL[] $image_urls

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* @param string $image_markup

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* @return void

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private function update_image_urls( $image_urls, $image_markup ) {

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foreach ( $image_urls as $image_url ) {

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$image_url_string = $image_url->get_absolute_url();

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if ( $this->cdn_helper->is_supported_url( $image_url_string ) ) {

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$image_url->set_url( $this->process_url( $image_url_string, $image_markup ) );

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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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if ( ! $this->cdn_helper->is_supported_url( $url ) ) {

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return $url;

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}

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return $this->cdn_helper->generate_cdn_url( $url );

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}

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private function is_rest_request() {

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return defined( 'REST_REQUEST' ) && REST_REQUEST;

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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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