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/**
 * Server-side registering and rendering of the `core/navigation-link` block.
 *
 * @package WordPress
 */

require_once __DIR__ . &#039;/navigation-link/shared/item-should-render.php&#039;;
require_once __DIR__ . &#039;/navigation-link/shared/render-submenu-icon.php&#039;;

/**
 * Build an array with CSS classes and inline styles defining the colors
 * which will be applied to the navigation markup in the front-end.
 *
 * @since 5.9.0
 *
 * @param  array $context     Navigation block context.
 * @param  array $attributes  Block attributes.
 * @param  bool  $is_sub_menu Whether the link is part of a sub-menu. Default false.
 * @return array Colors CSS classes and inline styles.
 */
function block_core_navigation_link_build_css_colors( $context, $attributes, $is_sub_menu = false ) {
	$colors = array(
		&#039;css_classes&#039;   =&gt; array(),
		&#039;inline_styles&#039; =&gt; &#039;&#039;,
	);

	// Text color.
	$named_text_color  = null;
	$custom_text_color = null;

	if ( $is_sub_menu &amp;&amp; array_key_exists( &#039;customOverlayTextColor&#039;, $context ) ) {
		$custom_text_color = $context[&#039;customOverlayTextColor&#039;];
	} elseif ( $is_sub_menu &amp;&amp; array_key_exists( &#039;overlayTextColor&#039;, $context ) ) {
		$named_text_color = $context[&#039;overlayTextColor&#039;];
	} elseif ( array_key_exists( &#039;customTextColor&#039;, $context ) ) {
		$custom_text_color = $context[&#039;customTextColor&#039;];
	} elseif ( array_key_exists( &#039;textColor&#039;, $context ) ) {
		$named_text_color = $context[&#039;textColor&#039;];
	} elseif ( isset( $context[&#039;style&#039;][&#039;color&#039;][&#039;text&#039;] ) ) {
		$custom_text_color = $context[&#039;style&#039;][&#039;color&#039;][&#039;text&#039;];
	}

	// If has text color.
	if ( ! is_null( $named_text_color ) ) {
		// Add the color class.
		array_push( $colors[&#039;css_classes&#039;], &#039;has-text-color&#039;, sprintf( &#039;has-%s-color&#039;, $named_text_color ) );
	} elseif ( ! is_null( $custom_text_color ) ) {
		// Add the custom color inline style.
		$colors[&#039;css_classes&#039;][]  = &#039;has-text-color&#039;;
		$colors[&#039;inline_styles&#039;] .= sprintf( &#039;color: %s;&#039;, $custom_text_color );
	}

	// Background color.
	$named_background_color  = null;
	$custom_background_color = null;

	if ( $is_sub_menu &amp;&amp; array_key_exists( &#039;customOverlayBackgroundColor&#039;, $context ) ) {
		$custom_background_color = $context[&#039;customOverlayBackgroundColor&#039;];
	} elseif ( $is_sub_menu &amp;&amp; array_key_exists( &#039;overlayBackgroundColor&#039;, $context ) ) {
		$named_background_color = $context[&#039;overlayBackgroundColor&#039;];
	} elseif ( array_key_exists( &#039;customBackgroundColor&#039;, $context ) ) {
		$custom_background_color = $context[&#039;customBackgroundColor&#039;];
	} elseif ( array_key_exists( &#039;backgroundColor&#039;, $context ) ) {
		$named_background_color = $context[&#039;backgroundColor&#039;];
	} elseif ( isset( $context[&#039;style&#039;][&#039;color&#039;][&#039;background&#039;] ) ) {
		$custom_background_color = $context[&#039;style&#039;][&#039;color&#039;][&#039;background&#039;];
	}

	// If has background color.
	if ( ! is_null( $named_background_color ) ) {
		// Add the background-color class.
		array_push( $colors[&#039;css_classes&#039;], &#039;has-background&#039;, sprintf( &#039;has-%s-background-color&#039;, $named_background_color ) );
	} elseif ( ! is_null( $custom_background_color ) ) {
		// Add the custom background-color inline style.
		$colors[&#039;css_classes&#039;][]  = &#039;has-background&#039;;
		$colors[&#039;inline_styles&#039;] .= sprintf( &#039;background-color: %s;&#039;, $custom_background_color );
	}

	return $colors;
}

/**
 * Build an array with CSS classes and inline styles defining the font sizes
 * which will be applied to the navigation markup in the front-end.
 *
 * This function is no longer used internally and is kept only for backward
 * compatibility with third-party code that may call it directly.
 *
 * @since 5.9.0
 * @deprecated 7.0.0
 *
 * @param  array $context Navigation block context.
 * @return array Font size CSS classes and inline styles.
 */
function block_core_navigation_link_build_css_font_sizes( $context ) {
	_deprecated_function( __FUNCTION__, &#039;7.0.0&#039; );

	// CSS classes.
	$font_sizes = array(
		&#039;css_classes&#039;   =&gt; array(),
		&#039;inline_styles&#039; =&gt; &#039;&#039;,
	);

	$has_named_font_size  = array_key_exists( &#039;fontSize&#039;, $context );
	$has_custom_font_size = isset( $context[&#039;style&#039;][&#039;typography&#039;][&#039;fontSize&#039;] );

	if ( $has_named_font_size ) {
		// Add the font size class.
		$font_sizes[&#039;css_classes&#039;][] = sprintf( &#039;has-%s-font-size&#039;, $context[&#039;fontSize&#039;] );
	} elseif ( $has_custom_font_size ) {
		// Add the custom font size inline style.
		$font_sizes[&#039;inline_styles&#039;] = sprintf(
			&#039;font-size: %s;&#039;,
			wp_get_typography_font_size_value(
				array(
					&#039;size&#039; =&gt; $context[&#039;style&#039;][&#039;typography&#039;][&#039;fontSize&#039;],
				)
			)
		);
	}

	return $font_sizes;
}

/**
 * Returns the top-level submenu SVG chevron icon.
 *
 * @since 5.9.0
 * @deprecated 7.0.0 Use block_core_shared_navigation_render_submenu_icon() instead.
 *
 * @return string
 */
function block_core_navigation_link_render_submenu_icon() {
	_deprecated_function(
		__FUNCTION__,
		&#039;7.0.0&#039;,
		&#039;block_core_shared_navigation_render_submenu_icon()&#039;
	);
	return block_core_shared_navigation_render_submenu_icon();
}

/**
 * Decodes a url if it&#039;s encoded, returning the same url if not.
 *
 * @since 6.2.0
 *
 * @param string $url The url to decode.
 *
 * @return string $url Returns the decoded url.
 */
function block_core_navigation_link_maybe_urldecode( $url ) {
	$is_url_encoded = false;
	$query          = parse_url( $url, PHP_URL_QUERY );
	$query_params   = wp_parse_args( $query );

	foreach ( $query_params as $query_param ) {
		$can_query_param_be_encoded = is_string( $query_param ) &amp;&amp; ! empty( $query_param );
		if ( ! $can_query_param_be_encoded ) {
			continue;
		}
		if ( rawurldecode( $query_param ) !== $query_param ) {
			$is_url_encoded = true;
			break;
		}
	}

	if ( $is_url_encoded ) {
		return rawurldecode( $url );
	}

	return $url;
}


/**
 * Renders the `core/navigation-link` block.
 *
 * @since 5.9.0
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The saved content.
 * @param WP_Block $block      The parsed block.
 *
 * @return string Returns the post content with the legacy widget added.
 */
function render_block_core_navigation_link( $attributes, $content, $block ) {
	// Check if this navigation item should render based on post status.
	if ( defined( &#039;IS_GUTENBERG_PLUGIN&#039; ) &amp;&amp; IS_GUTENBERG_PLUGIN ) {
		$should_render = gutenberg_block_core_shared_navigation_item_should_render( $attributes, $block );
	} else {
		$should_render = block_core_shared_navigation_item_should_render( $attributes, $block );
	}
	if ( ! $should_render ) {
		return &#039;&#039;;
	}

	// Don&#039;t render the block&#039;s subtree if it has no label.
	if ( empty( $attributes[&#039;label&#039;] ) ) {
		return &#039;&#039;;
	}

	$classes = array();

	// Render inner blocks first to check if any menu items will actually display.
	$inner_blocks_html = &#039;&#039;;
	foreach ( $block-&gt;inner_blocks as $inner_block ) {
		$inner_blocks_html .= $inner_block-&gt;render();
	}
	$has_submenu = ! empty( trim( $inner_blocks_html ) );

	$css_classes = trim( implode( &#039; &#039;, $classes ) );
	$kind        = empty( $attributes[&#039;kind&#039;] ) ? &#039;post_type&#039; : str_replace( &#039;-&#039;, &#039;_&#039;, $attributes[&#039;kind&#039;] );
	$is_active   = ! empty( $attributes[&#039;id&#039;] ) &amp;&amp; get_queried_object_id() === (int) $attributes[&#039;id&#039;] &amp;&amp; ! empty( get_queried_object()-&gt;$kind );

	if ( is_post_type_archive() &amp;&amp; ! empty( $attributes[&#039;url&#039;] ) ) {
		$queried_archive_link = get_post_type_archive_link( get_queried_object()-&gt;name );
		if ( $attributes[&#039;url&#039;] === $queried_archive_link ) {
			$is_active = true;
		}
	}

	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			&#039;class&#039; =&gt; $css_classes . &#039; wp-block-navigation-item&#039; . ( $has_submenu ? &#039; has-child&#039; : &#039;&#039; ) .
				( $is_active ? &#039; current-menu-item&#039; : &#039;&#039; ),
		)
	);
	$html               = &#039;&lt;li &#039; . $wrapper_attributes . &#039;&gt;&#039; .
		&#039;&lt;a class=&quot;wp-block-navigation-item__content&quot; &#039;;

	// Start appending HTML attributes to anchor tag.
	if ( isset( $attributes[&#039;url&#039;] ) ) {
		$html .= &#039; href=&quot;&#039; . esc_url( block_core_navigation_link_maybe_urldecode( $attributes[&#039;url&#039;] ) ) . &#039;&quot;&#039;;
	}

	if ( $is_active ) {
		$html .= &#039; aria-current=&quot;page&quot;&#039;;
	}

	if ( isset( $attributes[&#039;opensInNewTab&#039;] ) &amp;&amp; true === $attributes[&#039;opensInNewTab&#039;] ) {
		$html .= &#039; target=&quot;_blank&quot;  &#039;;
	}

	if ( isset( $attributes[&#039;rel&#039;] ) ) {
		$html .= &#039; rel=&quot;&#039; . esc_attr( $attributes[&#039;rel&#039;] ) . &#039;&quot;&#039;;
	} elseif ( isset( $attributes[&#039;nofollow&#039;] ) &amp;&amp; $attributes[&#039;nofollow&#039;] ) {
		$html .= &#039; rel=&quot;nofollow&quot;&#039;;
	}

	if ( isset( $attributes[&#039;title&#039;] ) ) {
		$html .= &#039; title=&quot;&#039; . esc_attr( $attributes[&#039;title&#039;] ) . &#039;&quot;&#039;;
	}

	// End appending HTML attributes to anchor tag.

	// Start anchor tag content.
	$html .= &#039;&gt;&#039; .
		// Wrap title with span to isolate it from submenu icon.
		&#039;&lt;span class=&quot;wp-block-navigation-item__label&quot;&gt;&#039;;

	if ( isset( $attributes[&#039;label&#039;] ) ) {
		$html .= wp_kses_post( $attributes[&#039;label&#039;] );
	}

	$html .= &#039;&lt;/span&gt;&#039;;

	// Add description if available.
	if ( ! empty( $attributes[&#039;description&#039;] ) ) {
		$html .= &#039;&lt;span class=&quot;wp-block-navigation-item__description&quot;&gt;&#039;;
		$html .= wp_kses_post( $attributes[&#039;description&#039;] );
		$html .= &#039;&lt;/span&gt;&#039;;
	}

	$html .= &#039;&lt;/a&gt;&#039;;
	// End anchor tag content.

	if ( isset( $block-&gt;context[&#039;showSubmenuIcon&#039;] ) &amp;&amp; $block-&gt;context[&#039;showSubmenuIcon&#039;] &amp;&amp; $has_submenu ) {
		// The submenu icon can be hidden by a CSS rule on the Navigation Block.
		$html .= &#039;&lt;span class=&quot;wp-block-navigation__submenu-icon&quot;&gt;&#039;;
		if ( defined( &#039;IS_GUTENBERG_PLUGIN&#039; ) &amp;&amp; IS_GUTENBERG_PLUGIN ) {
			$html .= gutenberg_block_core_shared_navigation_render_submenu_icon();
		} else {
			$html .= block_core_shared_navigation_render_submenu_icon();
		}
		$html .= &#039;&lt;/span&gt;&#039;;
	}

	if ( $has_submenu ) {
		$html .= sprintf(
			&#039;&lt;ul class=&quot;wp-block-navigation__submenu-container&quot;&gt;%s&lt;/ul&gt;&#039;,
			$inner_blocks_html
		);
	}

	$html .= &#039;&lt;/li&gt;&#039;;

	return $html;
}

/**
 * Returns a navigation link variation
 *
 * @since 5.9.0
 *
 * @param WP_Taxonomy|WP_Post_Type $entity post type or taxonomy entity.
 * @param string                   $kind string of value &#039;taxonomy&#039; or &#039;post-type&#039;.
 *
 * @return array
 */
function build_variation_for_navigation_link( $entity, $kind ) {
	$title       = &#039;&#039;;
	$description = &#039;&#039;;

	// Get default labels based on entity type
	$default_labels = null;
	if ( $entity instanceof WP_Post_Type ) {
		$default_labels = WP_Post_Type::get_default_labels();
	} elseif ( $entity instanceof WP_Taxonomy ) {
		$default_labels = WP_Taxonomy::get_default_labels();
	}

	// Get title and check if it&#039;s default
	$is_default_title = false;
	if ( property_exists( $entity-&gt;labels, &#039;item_link&#039; ) ) {
		$title = $entity-&gt;labels-&gt;item_link;
		if ( isset( $default_labels[&#039;item_link&#039;] ) ) {
			$is_default_title = in_array( $title, $default_labels[&#039;item_link&#039;], true );
		}
	}

	// Get description and check if it&#039;s default
	$is_default_description = false;
	if ( property_exists( $entity-&gt;labels, &#039;item_link_description&#039; ) ) {
		$description = $entity-&gt;labels-&gt;item_link_description;
		if ( isset( $default_labels[&#039;item_link_description&#039;] ) ) {
			$is_default_description = in_array( $description, $default_labels[&#039;item_link_description&#039;], true );
		}
	}

	// Calculate singular name once (used for both title and description)
	$singular = $entity-&gt;labels-&gt;singular_name ?? ucfirst( $entity-&gt;name );

	// Set default title if needed
	if ( $is_default_title || &#039;&#039; === $title ) {
		/* translators: %s: Singular label of the entity. */
		$title = sprintf( __( &#039;%s link&#039; ), $singular );
	}

	// Default description if needed.
	// Use a single space character instead of an empty string to prevent fallback to the
	// block.json default description (&quot;Add a page, link, or another item to your navigation.&quot;).
	// An empty string would be treated as missing and trigger the fallback, while a single
	// space appears blank in the UI but prevents the fallback behavior.
	// We avoid generating descriptions like &quot;A link to a %s&quot; to prevent grammatical errors
	// (e.g., &quot;A link to a event&quot; should be &quot;A link to an event&quot;).
	if ( $is_default_description || &#039;&#039; === $description ) {
		$description = &#039; &#039;;
	}

	$variation = array(
		&#039;name&#039;        =&gt; $entity-&gt;name,
		&#039;title&#039;       =&gt; $title,
		&#039;description&#039; =&gt; $description,
		&#039;attributes&#039;  =&gt; array(
			&#039;type&#039; =&gt; $entity-&gt;name,
			&#039;kind&#039; =&gt; $kind,
		),
	);

	// Tweak some value for the variations.
	$variation_overrides = array(
		&#039;post_tag&#039;    =&gt; array(
			&#039;name&#039;       =&gt; &#039;tag&#039;,
			&#039;attributes&#039; =&gt; array(
				&#039;type&#039; =&gt; &#039;tag&#039;,
				&#039;kind&#039; =&gt; $kind,
			),
		),
		&#039;post_format&#039; =&gt; array(
			// The item_link and item_link_description for post formats is the
			// same as for tags, so need to be overridden.
			&#039;title&#039;       =&gt; __( &#039;Post Format Link&#039; ),
			&#039;description&#039; =&gt; __( &#039;A link to a post format&#039; ),
			&#039;attributes&#039;  =&gt; array(
				&#039;type&#039; =&gt; &#039;post_format&#039;,
				&#039;kind&#039; =&gt; $kind,
			),
		),
	);

	if ( array_key_exists( $entity-&gt;name, $variation_overrides ) ) {
		$variation = array_merge(
			$variation,
			$variation_overrides[ $entity-&gt;name ]
		);
	}

	return $variation;
}

/**
 * Filters the registered variations for a block type.
 * Returns the dynamically built variations for all post-types and taxonomies.
 *
 * @since 6.5.0
 *
 * @param array         $variations Array of registered variations for a block type.
 * @param WP_Block_Type $block_type The full block type object.
 * @return array Numerically indexed array of block variations.
 */
function block_core_navigation_link_filter_variations( $variations, $block_type ) {
	if ( &#039;core/navigation-link&#039; !== $block_type-&gt;name ) {
		return $variations;
	}

	$generated_variations = block_core_navigation_link_build_variations();

	/*
	 * IMPORTANT: Order matters for deduplication.
	 *
	 * The variations returned from this filter are bootstrapped to JavaScript and
	 * processed by the block variations reducer. The reducer uses `getUniqueItemsByName()`
	 * (packages/blocks/src/store/reducer.js:51-57) which keeps the FIRST variation with
	 * a given &#039;name&#039; and discards later duplicates when processing the array in order.
	 *
	 * By placing generated variations first in `array_merge()`, the improved
	 * labels (e.g., &quot;Product link&quot; instead of generic &quot;Post Link&quot;) are processed first
	 * and preserved. The generic incoming variations are then discarded as duplicates.
	 *
	 * Why `array_merge()` instead of manual deduplication?
	 * - Both arrays use numeric indices (0, 1, 2...), so `array_merge()` concatenates
	 *   and re-indexes them sequentially, preserving order
	 * - The reducer handles deduplication, so it is not needed here
	 * - This keeps the PHP code simple and relies on the established JavaScript behavior
	 *
	 * See: https://github.com/WordPress/gutenberg/pull/72517
	 */
	return array_merge( $generated_variations, $variations );
}

/**
 * Returns an array of variations for the navigation link block.
 *
 * @since 6.5.0
 *
 * @return array
 */
function block_core_navigation_link_build_variations() {
	$post_types = get_post_types( array( &#039;show_in_nav_menus&#039; =&gt; true ), &#039;objects&#039; );
	$taxonomies = get_taxonomies( array( &#039;show_in_nav_menus&#039; =&gt; true ), &#039;objects&#039; );

	/*
	 * Use two separate arrays as a way to order the variations in the UI.
	 * Known variations (like Post Link and Page Link) are added to the
	 * `built_ins` array. Variations for custom post types and taxonomies are
	 * added to the `variations` array and will always appear after `built-ins.
	 */
	$built_ins  = array();
	$variations = array();

	if ( $post_types ) {
		foreach ( $post_types as $post_type ) {
			$variation = build_variation_for_navigation_link( $post_type, &#039;post-type&#039; );
			if ( $post_type-&gt;_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}
	if ( $taxonomies ) {
		foreach ( $taxonomies as $taxonomy ) {
			$variation = build_variation_for_navigation_link( $taxonomy, &#039;taxonomy&#039; );
			if ( $taxonomy-&gt;_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}

	$all_variations = array_merge( $built_ins, $variations );

	return $all_variations;
}

/**
 * Registers the navigation link block.
 *
 * @since 5.9.0
 *
 * @uses render_block_core_navigation_link()
 * @throws WP_Error An WP_Error exception parsing the block definition.
 */
function register_block_core_navigation_link() {
	register_block_type_from_metadata(
		__DIR__ . &#039;/navigation-link&#039;,
		array(
			&#039;render_callback&#039; =&gt; &#039;render_block_core_navigation_link&#039;,
		)
	);
}
add_action( &#039;init&#039;, &#039;register_block_core_navigation_link&#039; );
/**
 * Creates all variations for post types / taxonomies dynamically (= each time when variations are requested).
 * Do not use variation_callback, to also account for unregistering post types/taxonomies later on.
 */
add_filter( &#039;get_block_type_variations&#039;, &#039;block_core_navigation_link_filter_variations&#039;, 10, 2 );
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