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<?php

namespace Smush\Core\LCP;

use Smush\Core\Parser\Composite_Element;
use Smush\Core\Parser\Element;
use Smush\Core\Parser\Element_Attribute;
use Smush\Core\Settings;
use Smush\Core\Transform\Transform;

class LCP_Transform implements Transform {
	private $settings;

public function __construct() {
		$this->settings = Settings::get_instance();
	}

public function should_transform() {
		return $this->settings->is_lcp_preload_enabled();
	}

public function transform_page( $page ) {
		// The loading attribute may already have been removed by the lazy load transform, but we still need to handle the cases where it hasn't been removed
		// For example: - Smush lazy loading is disabled - We are on a page that is excluded
		$lcp_element = $page->get_lcp_element();
		if ( is_a( $lcp_element, Composite_Element::class ) ) {
			foreach ( $lcp_element->get_elements() as $sub_element ) {
				$this->update_priority_attributes( $sub_element );
			}
		} elseif ( is_a( $lcp_element, Element::class ) ) {
			$this->update_priority_attributes( $lcp_element );
		}
	}

/**
	 * @param Element $lcp_element
	 *
	 * @return void
	 */
	private function set_fetch_priority_high( Element $lcp_element ) {
		$fetch_priority_attribute = $lcp_element->get_attribute( 'fetchpriority' );
		if ( $fetch_priority_attribute ) {
			if ( $fetch_priority_attribute->get_value() !== 'high' ) {
				$fetch_priority_attribute->set_value( 'high' );
			}
		} else {
			$lcp_element->add_attribute( new Element_Attribute( 'fetchpriority', 'high' ) );
		}
	}

/**
	 * @param Element $lcp_element
	 *
	 * @return void
	 */
	private function remove_native_lazy_loading( Element $lcp_element ) {
		if ( $lcp_element->has_attribute( 'loading' ) ) {
			$loading_attribute = $lcp_element->get_attribute( 'loading' );
			if ( $loading_attribute->get_value() === 'lazy' ) {
				$lcp_element->remove_attribute( $loading_attribute );
			}
		}
	}

public function transform_image_url( $url ) {
		return $url;
	}

/**
	 * @param Element $element
	 *
	 * @return void
	 */
	private function update_priority_attributes( Element $element ) {
		$this->remove_native_lazy_loading( $element );
		if ( $element->get_tag() === 'img' ) {
			$this->set_fetch_priority_high( $element );
		}
	}
}

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