<?php
/**
 * Image Performance Block Settings
 * Adds fetchpriority and loading controls to core/image block
 *
 * @package Brandy\BlockSettings\ImagePerformance
 * @since 1.5.0
 */

namespace Brandy\BlockSettings\ImagePerformance;

use Brandy\Traits\SingletonTrait;
use Brandy\Interfaces\ExternalBlockSettingsInterface;

/**
 * Caller class for Image Performance settings
 */
class Caller implements ExternalBlockSettingsInterface {
	use SingletonTrait;

	protected $supported_blocks = array(
		'core/image',
		'woocommerce/product-image',
		'core/post-featured-image'
	);

	/**
	 * Constructor - register hooks
	 */
	protected function __construct() {
		add_filter( 'block_type_metadata_settings', array( $this, 'declare_attribute' ), 10 );
		add_action( 'enqueue_block_editor_assets', array( $this, 'enqueue_settings_scripts' ) );

		foreach ( $this->supported_blocks as $block ) {
			add_filter( 'render_block_' . $block, array( $this, 'apply_performance_attrs' ), 20, 2 );
		}
	}

	/**
	 * Check if block is an image block
	 *
	 * @param string $name Block name.
	 * @return bool
	 */
	private function is_supported( $name ) {
		return in_array( $name, $this->supported_blocks );
	}

	/**
	 * Declare custom attributes for image block
	 *
	 * @param array $settings Block settings.
	 * @return array Modified settings.
	 */
	public function declare_attribute( $settings ) {
		if ( empty( $settings['name'] ) ) {
			return $settings;
		}

		if ( ! $this->is_supported( $settings['name'] ) ) {
			return $settings;
		}

		if ( ! empty( $settings['attributes'] ) ) {
			// Fetch priority: high | low | empty (auto/browser default)
			$settings['attributes']['fetchPriority'] = array(
				'type'    => 'string',
				'default' => '',
			);

			// Loading: lazy | eager | empty (WP default)
			$settings['attributes']['loading'] = array(
				'type'    => 'string',
				'default' => '',
			);
		}

		return $settings;
	}

	/**
	 * Enqueue editor scripts
	 */
	public function enqueue_settings_scripts() {
		wp_enqueue_script(
			'brandy/image-performance',
			BRANDY_TEMPLATE_URL . '/inc/BlockSettings/ImagePerformance/script.js',
			array( 'wp-edit-post', 'wp-blocks', 'wp-element', 'wp-components', 'wp-block-editor', 'wp-compose', 'wp-hooks', 'wp-i18n' ),
			BRANDY_SCRIPT_VERSION,
			true
		);
	}

	/**
	 * Apply performance attributes to rendered image block
	 *
	 * @param string $html  Block HTML.
	 * @param array  $block Block data.
	 * @return string Modified HTML.
	 */
	public function apply_performance_attrs( $html, $block ) {
		$attrs = $block['attrs'] ?? array();

		$fetch_priority = $attrs['fetchPriority'] ?? '';
		$loading        = $attrs['loading'] ?? '';

		// Skip if no custom attrs set
		if ( empty( $fetch_priority ) && empty( $loading ) ) {
			return $html;
		}

		$tag = new \WP_HTML_Tag_Processor( $html );

		if ( $tag->next_tag( 'img' ) ) {
			// Apply fetchpriority if set
			if ( ! empty( $fetch_priority ) ) {
				$tag->set_attribute( 'fetchpriority', $fetch_priority );
			}

			// Apply loading if set (overrides WP default)
			if ( ! empty( $loading ) ) {
				$tag->set_attribute( 'loading', $loading );
			}
		}

		return $tag->get_updated_html();
	}
}

Caller::get_instance();