<?php

/**

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

 *

 * @package WordPress

 */

/**

 * Build an array with CSS classes and inline styles defining the colors

 * which will be applied to the navigation markup in the front-end.

 *

 * @param  array $context    Navigation block context.

 * @param  array $attributes Block attributes.

 * @return array Colors CSS classes and inline styles.

 */

function block_core_navigation_link_build_css_colors( $context, $attributes ) {

	$colors = array(

		'css_classes'   => array(),

		'inline_styles' => '',

	);

	$is_sub_menu = isset( $attributes['isTopLevelLink'] ) ? ( ! $attributes['isTopLevelLink'] ) : false;

	// Text color.

	$named_text_color  = null;

	$custom_text_color = null;

	if ( $is_sub_menu && array_key_exists( 'customOverlayTextColor', $context ) ) {

		$custom_text_color = $context['customOverlayTextColor'];

	} elseif ( $is_sub_menu && array_key_exists( 'overlayTextColor', $context ) ) {

		$named_text_color = $context['overlayTextColor'];

	} elseif ( array_key_exists( 'customTextColor', $context ) ) {

		$custom_text_color = $context['customTextColor'];

	} elseif ( array_key_exists( 'textColor', $context ) ) {

		$named_text_color = $context['textColor'];

	} elseif ( isset( $context['style']['color']['text'] ) ) {

		$custom_text_color = $context['style']['color']['text'];

	}

	// If has text color.

	if ( ! is_null( $named_text_color ) ) {

		// Add the color class.

		array_push( $colors['css_classes'], 'has-text-color', sprintf( 'has-%s-color', $named_text_color ) );

	} elseif ( ! is_null( $custom_text_color ) ) {

		// Add the custom color inline style.

		$colors['css_classes'][]  = 'has-text-color';

		$colors['inline_styles'] .= sprintf( 'color: %s;', $custom_text_color );

	}

	// Background color.

	$named_background_color  = null;

	$custom_background_color = null;

	if ( $is_sub_menu && array_key_exists( 'customOverlayBackgroundColor', $context ) ) {

		$custom_background_color = $context['customOverlayBackgroundColor'];

	} elseif ( $is_sub_menu && array_key_exists( 'overlayBackgroundColor', $context ) ) {

		$named_background_color = $context['overlayBackgroundColor'];

	} elseif ( array_key_exists( 'customBackgroundColor', $context ) ) {

		$custom_background_color = $context['customBackgroundColor'];

	} elseif ( array_key_exists( 'backgroundColor', $context ) ) {

		$named_background_color = $context['backgroundColor'];

	} elseif ( isset( $context['style']['color']['background'] ) ) {

		$custom_background_color = $context['style']['color']['background'];

	}

	// If has background color.

	if ( ! is_null( $named_background_color ) ) {

		// Add the background-color class.

		array_push( $colors['css_classes'], 'has-background', sprintf( 'has-%s-background-color', $named_background_color ) );

	} elseif ( ! is_null( $custom_background_color ) ) {

		// Add the custom background-color inline style.

		$colors['css_classes'][]  = 'has-background';

		$colors['inline_styles'] .= sprintf( 'background-color: %s;', $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.

 *

 * @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 ) {

	// CSS classes.

	$font_sizes = array(

		'css_classes'   => array(),

		'inline_styles' => '',

	);

	$has_named_font_size  = array_key_exists( 'fontSize', $context );

	$has_custom_font_size = isset( $context['style']['typography']['fontSize'] );

	if ( $has_named_font_size ) {

		// Add the font size class.

		$font_sizes['css_classes'][] = sprintf( 'has-%s-font-size', $context['fontSize'] );

	} elseif ( $has_custom_font_size ) {

		// Add the custom font size inline style.

		$font_sizes['inline_styles'] = sprintf( 'font-size: %s;', $context['style']['typography']['fontSize'] );

	}

	return $font_sizes;

}

/**

 * Returns the top-level submenu SVG chevron icon.

 *

 * @return string

 */

function block_core_navigation_link_render_submenu_icon() {

	return '<svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 12 12" fill="none" aria-hidden="true" focusable="false"><path d="M1.50002 4L6.00002 8L10.5 4" stroke-width="1.5"></path></svg>';

}

/**

 * Renders the `core/navigation-link` block.

 *

 * @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 ) {

	$navigation_link_has_id = isset( $attributes['id'] ) && is_numeric( $attributes['id'] );

	$is_post_type           = isset( $attributes['kind'] ) && 'post-type' === $attributes['kind'];

	$is_post_type           = $is_post_type || isset( $attributes['type'] ) && ( 'post' === $attributes['type'] || 'page' === $attributes['type'] );

	// Don't render the block's subtree if it is a draft or if the ID does not exist.

	if ( $is_post_type && $navigation_link_has_id ) {

		$post = get_post( $attributes['id'] );

		if ( ! $post || 'publish' !== $post->post_status ) {

			return '';

		}

	}

	// Don't render the block's subtree if it has no label.

	if ( empty( $attributes['label'] ) ) {

		return '';

	}

	$colors          = block_core_navigation_link_build_css_colors( $block->context, $attributes );

	$font_sizes      = block_core_navigation_link_build_css_font_sizes( $block->context );

	$classes         = array_merge(

		$colors['css_classes'],

		$font_sizes['css_classes']

	);

	$style_attribute = ( $colors['inline_styles'] . $font_sizes['inline_styles'] );

	$css_classes = trim( implode( ' ', $classes ) );

	$has_submenu = count( $block->inner_blocks ) > 0;

	$is_active   = ! empty( $attributes['id'] ) && ( get_the_ID() === $attributes['id'] );

	$wrapper_attributes = get_block_wrapper_attributes(

		array(

			'class' => $css_classes . ' wp-block-navigation-item' . ( $has_submenu ? ' has-child' : '' ) .

				( $is_active ? ' current-menu-item' : '' ),

			'style' => $style_attribute,

		)

	);

	$html               = '<li ' . $wrapper_attributes . '>' .

		'<a class="wp-block-navigation-item__content" ';

	// Start appending HTML attributes to anchor tag.

	if ( isset( $attributes['url'] ) ) {

		$html .= ' href="' . esc_url( $attributes['url'] ) . '"';

	}

	if ( $is_active ) {

		$html .= ' aria-current="page"';

	}

	if ( isset( $attributes['opensInNewTab'] ) && true === $attributes['opensInNewTab'] ) {

		$html .= ' target="_blank"  ';

	}

	if ( isset( $attributes['rel'] ) ) {

		$html .= ' rel="' . esc_attr( $attributes['rel'] ) . '"';

	} elseif ( isset( $attributes['nofollow'] ) && $attributes['nofollow'] ) {

		$html .= ' rel="nofollow"';

	}

	if ( isset( $attributes['title'] ) ) {

		$html .= ' title="' . esc_attr( $attributes['title'] ) . '"';

	}

	// End appending HTML attributes to anchor tag.

	// Start anchor tag content.

	$html .= '>' .

		// Wrap title with span to isolate it from submenu icon.

		'<span class="wp-block-navigation-item__label">';

	if ( isset( $attributes['label'] ) ) {

		$html .= wp_kses_post( $attributes['label'] );

	}

	$html .= '</span>';

	// Add description if available.

	if ( ! empty( $attributes['description'] ) ) {

		$html .= '<span class="wp-block-navigation-item__description">';

		$html .= wp_kses_post( $attributes['description'] );

		$html .= '</span>';

	}

	$html .= '</a>';

	// End anchor tag content.

	if ( isset( $block->context['showSubmenuIcon'] ) && $block->context['showSubmenuIcon'] && $has_submenu ) {

		// The submenu icon can be hidden by a CSS rule on the Navigation Block.

		$html .= '<span class="wp-block-navigation__submenu-icon">' . block_core_navigation_link_render_submenu_icon() . '</span>';

	}

	if ( $has_submenu ) {

		$inner_blocks_html = '';

		foreach ( $block->inner_blocks as $inner_block ) {

			$inner_blocks_html .= $inner_block->render();

		}

		$html .= sprintf(

			'<ul class="wp-block-navigation__submenu-container">%s</ul>',

			$inner_blocks_html

		);

	}

	$html .= '</li>';

	return $html;

}

/**

 * Returns a navigation link variation

 *

 * @param WP_Taxonomy|WP_Post_Type $entity post type or taxonomy entity.

 * @param string                   $kind string of value 'taxonomy' or 'post-type'.

 *

 * @return array

 */

function build_variation_for_navigation_link( $entity, $kind ) {

	$title       = '';

	$description = '';

	if ( property_exists( $entity->labels, 'item_link' ) ) {

		$title = $entity->labels->item_link;

	}

	if ( property_exists( $entity->labels, 'item_link_description' ) ) {

		$description = $entity->labels->item_link_description;

	}

	$variation = array(

		'name'        => $entity->name,

		'title'       => $title,

		'description' => $description,

		'attributes'  => array(

			'type' => $entity->name,

			'kind' => $kind,

		),

	);

	// Tweak some value for the variations.

	$variation_overrides = array(

		'post_tag'    => array(

			'name'       => 'tag',

			'attributes' => array(

				'type' => 'tag',

				'kind' => $kind,

			),

		),

		'post_format' => array(

			// The item_link and item_link_description for post formats is the

			// same as for tags, so need to be overridden.

			'title'       => __( 'Post Format Link' ),

			'description' => __( 'A link to a post format' ),

			'attributes'  => array(

				'type' => 'post_format',

				'kind' => $kind,

			),

		),

	);

	if ( array_key_exists( $entity->name, $variation_overrides ) ) {

		$variation = array_merge(

			$variation,

			$variation_overrides[ $entity->name ]

		);

	}

	return $variation;

}

/**

 * Register the navigation link block.

 *

 * @uses render_block_core_navigation()

 * @throws WP_Error An WP_Error exception parsing the block definition.

 */

function register_block_core_navigation_link() {

	$post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );

	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'objects' );

	// 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, 'post-type' );

			if ( $post_type->_builtin ) {

				$built_ins[] = $variation;

			} else {

				$variations[] = $variation;

			}

		}

	}

	if ( $taxonomies ) {

		foreach ( $taxonomies as $taxonomy ) {

			$variation = build_variation_for_navigation_link( $taxonomy, 'taxonomy' );

			if ( $taxonomy->_builtin ) {

				$built_ins[] = $variation;

			} else {

				$variations[] = $variation;

			}

		}

	}

	register_block_type_from_metadata(

		__DIR__ . '/navigation-link',

		array(

			'render_callback' => 'render_block_core_navigation_link',

			'variations'      => array_merge( $built_ins, $variations ),

		)

	);

}

add_action( 'init', 'register_block_core_navigation_link' );