<?php

/**

 * Server-side rendering of the `core/image` block.

 *

 * @package WordPress

 */

/**

 * Renders the `core/image` block on the server,

 * adding a data-id attribute to the element if core/gallery has added on pre-render.

 *

 * @since 5.9.0

 *

 * @param array    $attributes The block attributes.

 * @param string   $content    The block content.

 * @param WP_Block $block      The block object.

 *

 * @return string The block content with the data-id attribute added.

 */

function render_block_core_image( $attributes, $content, $block ) {

	if ( false === stripos( $content, '<img' ) ) {

		return '';

	}

	$p = new WP_HTML_Tag_Processor( $content );

		return '';

	}

	$has_id_binding = isset( $attributes['metadata']['bindings']['id'] ) && isset( $attributes['id'] );

	// Ensure the `wp-image-id` classname on the image block supports block bindings.

	if ( $has_id_binding ) {

		// If there's a mismatch with the 'wp-image-' class and the actual id, the id was

		// probably overridden by block bindings. Update it to the correct value.

		// See https://github.com/WordPress/gutenberg/issues/62886 for why this is needed.

		$id                       = $attributes['id'];

		$image_classnames         = $p->get_attribute( 'class' );

		$class_with_binding_value = "wp-image-$id";

		if ( is_string( $image_classnames ) && ! str_contains( $image_classnames, $class_with_binding_value ) ) {

			$image_classnames = preg_replace( '/wp-image-(\d+)/', $class_with_binding_value, $image_classnames );

			$p->set_attribute( 'class', $image_classnames );

		}

	}

	// For backwards compatibility, the data-id html attribute is only set for

	// image blocks nested in a gallery. Detect if the image is in a gallery by

	// checking the data-id attribute.

	// See the `block_core_gallery_data_id_backcompatibility` function.

	if ( isset( $attributes['data-id'] ) ) {

		// If there's a binding for the `id`, the `id` attribute is used for the

		// value, since `data-id` does not support block bindings.

		// Else the `data-id` is used for backwards compatibility, since

		// third parties may be filtering its value.

		$data_id = $has_id_binding ? $attributes['id'] : $attributes['data-id'];

		$p->set_attribute( 'data-id', $data_id );

	}

	$link_destination  = isset( $attributes['linkDestination'] ) ? $attributes['linkDestination'] : 'none';

	$lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block );

	/*

	 * If the lightbox is enabled and the image is not linked, adds the filter and

	 * the JavaScript view file.

	 */

	if (

		isset( $lightbox_settings ) &&

		'none' === $link_destination &&

		isset( $lightbox_settings['enabled'] ) &&

		true === $lightbox_settings['enabled']

	) {

		/*

		 * This render needs to happen in a filter with priority 15 to ensure that

		 * it runs after the duotone filter and that duotone styles are applied to

		 * the image in the lightbox. Lightbox has to work with any plugins that

		 * might use filters as well. Removing this can be considered in the future

		 * if the way the blocks are rendered changes, or if a new kind of filter is

		 * introduced.

		 */

		add_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15, 2 );

	} else {

		/*

		 * Remove the filter if previously added by other Image blocks.

		 */

		remove_filter( 'render_block_core/image', 'block_core_image_render_lightbox', 15 );

	}

	return $p->get_updated_html();

}

/**

 * Adds the lightboxEnabled flag to the block data.

 *

 * This is used to determine whether the lightbox should be rendered or not.

 *

 * @since 6.4.0

 *

 * @param array $block Block data.

 *

 * @return array Filtered block data.

 */

function block_core_image_get_lightbox_settings( $block ) {

	// Gets the lightbox setting from the block attributes.

	if ( isset( $block['attrs']['lightbox'] ) ) {

		$lightbox_settings = $block['attrs']['lightbox'];

	}

	if ( ! isset( $lightbox_settings ) ) {

		$lightbox_settings = wp_get_global_settings( array( 'lightbox' ), array( 'block_name' => 'core/image' ) );

		// If not present in global settings, check the top-level global settings.

		//

		// NOTE: If no block-level settings are found, the previous call to

		// `wp_get_global_settings` will return the whole `theme.json` structure in

		// which case we can check if the "lightbox" key is present at the top-level

		// of the global settings and use its value.

		if ( isset( $lightbox_settings['lightbox'] ) ) {

			$lightbox_settings = wp_get_global_settings( array( 'lightbox' ) );

		}

	}

	return $lightbox_settings ?? null;

}

/**

 * Adds the directives and layout needed for the lightbox behavior.

 *

 * @since 6.4.0

 *

 * @param string $block_content Rendered block content.

 * @param array  $block         Block object.

 *

 * @return string Filtered block content.

 */

function block_core_image_render_lightbox( $block_content, $block ) {

	/*

	 * If there's no IMG tag in the block then return the given block content

	 * as-is. There's nothing that this code can knowingly modify to add the

	 * lightbox behavior.

	 */

	$p = new WP_HTML_Tag_Processor( $block_content );

	if ( $p->next_tag( 'figure' ) ) {

		$p->set_bookmark( 'figure' );

	}

	if ( ! $p->next_tag( 'img' ) ) {

		return $block_content;

	}

	if ( isset( $block['attrs']['id'] ) ) {

		$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );

		$img_metadata     = wp_get_attachment_metadata( $block['attrs']['id'] );

		$img_width        = $img_metadata['width'] ?? 'none';

		$img_height       = $img_metadata['height'] ?? 'none';

	}

	// Figure.

	$p->seek( 'figure' );

	$figure_class_names = $p->get_attribute( 'class' );

	$figure_styles      = $p->get_attribute( 'style' );

	$p->add_class( 'wp-lightbox-container' );

	$p->set_attribute( 'data-wp-interactive', 'core/image' );

	$p->set_attribute(

		'data-wp-context',

		wp_json_encode(

			array(

			),

			JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP

		)

	);

	// Image.

	$p->next_tag( 'img' );

	$p->set_attribute( 'data-wp-init', 'callbacks.setButtonStyles' );

	$p->set_attribute( 'data-wp-on-async--load', 'callbacks.setButtonStyles' );

	$p->set_attribute( 'data-wp-on-async-window--resize', 'callbacks.setButtonStyles' );

	// Sets an event callback on the `img` because the `figure` element can also

	// contain a caption, and we don't want to trigger the lightbox when the

	// caption is clicked.

	$p->set_attribute( 'data-wp-on-async--click', 'actions.showLightbox' );

	$body_content = $p->get_updated_html();

	// Adds a button alongside image in the body content.

	$img = null;

	preg_match( '/<img[^>]+>/', $body_content, $img );

	$button =

		$img[0]

		. '<button

			class="lightbox-trigger"

			type="button"

			aria-haspopup="dialog"

			aria-label="' . esc_attr( $aria_label ) . '"

			data-wp-init="callbacks.initTriggerButton"

			data-wp-on-async--click="actions.showLightbox"

		>

			<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" fill="none" viewBox="0 0 12 12">

				<path fill="#fff" d="M2 0a2 2 0 0 0-2 2v2h1.5V2a.5.5 0 0 1 .5-.5h2V0H2Zm2 10.5H2a.5.5 0 0 1-.5-.5V8H0v2a2 2 0 0 0 2 2h2v-1.5ZM8 12v-1.5h2a.5.5 0 0 0 .5-.5V8H12v2a2 2 0 0 1-2 2H8Zm2-12a2 2 0 0 1 2 2v2h-1.5V2a.5.5 0 0 0-.5-.5H8V0h2Z" />

			</svg>

		</button>';

	$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );

	add_action( 'wp_footer', 'block_core_image_print_lightbox_overlay' );

	return $body_content;

}

/**

 * @since 6.5.0

 */

function block_core_image_print_lightbox_overlay() {

	$close_button_label = esc_attr__( 'Close' );

	// If the current theme does NOT have a `theme.json`, or the colors are not

	// defined, it needs to set the background color & close button color to some

	// default values because it can't get them from the Global Styles.

	$background_color   = '#fff';

	$close_button_color = '#000';

	if ( wp_theme_has_theme_json() ) {

		$global_styles_color = wp_get_global_styles( array( 'color' ) );

		if ( ! empty( $global_styles_color['background'] ) ) {

			$background_color = esc_attr( $global_styles_color['background'] );

		}

		if ( ! empty( $global_styles_color['text'] ) ) {

			$close_button_color = esc_attr( $global_styles_color['text'] );

		}

	}

	echo <<<HTML

		<div

			class="wp-lightbox-overlay zoom"

			data-wp-interactive="core/image"

			data-wp-context='{}'

			data-wp-bind--role="state.roleAttribute"

			data-wp-bind--aria-label="state.currentImage.ariaLabel"

			data-wp-bind--aria-modal="state.ariaModal"

			data-wp-class--active="state.overlayEnabled"

			data-wp-class--show-closing-animation="state.showClosingAnimation"

			data-wp-watch="callbacks.setOverlayFocus"

			data-wp-on--keydown="actions.handleKeydown"

			data-wp-on-async--touchstart="actions.handleTouchStart"

			data-wp-on--touchmove="actions.handleTouchMove"

			data-wp-on-async--touchend="actions.handleTouchEnd"

			data-wp-on-async--click="actions.hideLightbox"

			data-wp-on-async-window--resize="callbacks.setOverlayStyles"

			data-wp-on-async-window--scroll="actions.handleScroll"

			tabindex="-1"

			>

				<button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button">

				</button>

				<div class="lightbox-image-container">

						<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.currentImage.currentSrc">

					</figure>

				</div>

				<div class="lightbox-image-container">

						<img data-wp-bind--alt="state.currentImage.alt" data-wp-bind--class="state.currentImage.imgClassNames" data-wp-bind--style="state.imgStyles" data-wp-bind--src="state.enlargedSrc">

					</figure>

				</div>

				<div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>

		</div>

HTML;

}

/**

 * Registers the `core/image` block on server.

 *

 * @since 5.9.0

 */

function register_block_core_image() {

	register_block_type_from_metadata(

		__DIR__ . '/image',

		array(

			'render_callback' => 'render_block_core_image',

		)

	);

}

add_action( 'init', 'register_block_core_image' );