<?php

/**

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

 *

 * @package WordPress

 */

/**

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

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

 *

 * @param  array $context home link block context.

 * @return array Colors CSS classes and inline styles.

 */

function block_core_home_link_build_css_colors( $context ) {

	$colors = array(

		'css_classes'   => array(),

		'inline_styles' => '',

	);

	// Text color.

	$has_named_text_color  = array_key_exists( 'textColor', $context );

	$has_custom_text_color = isset( $context['style']['color']['text'] );

	// If has text color.

	if ( $has_custom_text_color || $has_named_text_color ) {

		// Add has-text-color class.

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

	}

	if ( $has_named_text_color ) {

		// Add the color class.

		$colors['css_classes'][] = sprintf( 'has-%s-color', $context['textColor'] );

	} elseif ( $has_custom_text_color ) {

		// Add the custom color inline style.

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

	}

	// Background color.

	$has_named_background_color  = array_key_exists( 'backgroundColor', $context );

	$has_custom_background_color = isset( $context['style']['color']['background'] );

	// If has background color.

	if ( $has_custom_background_color || $has_named_background_color ) {

		// Add has-background class.

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

	}

	if ( $has_named_background_color ) {

		// Add the background-color class.

		$colors['css_classes'][] = sprintf( 'has-%s-background-color', $context['backgroundColor'] );

	} elseif ( $has_custom_background_color ) {

		// Add the custom background-color inline style.

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

	}

	return $colors;

}

/**

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

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

 *

 * @param  array $context Home link block context.

 * @return array Font size CSS classes and inline styles.

 */

function block_core_home_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;

}

/**

 * Builds an array with classes and style for the li wrapper

 *

 * @param  array $context    Home link block context.

 * @return array The li wrapper attributes.

 */

function block_core_home_link_build_li_wrapper_attributes( $context ) {

	$colors          = block_core_home_link_build_css_colors( $context );

	$font_sizes      = block_core_home_link_build_css_font_sizes( $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 ) ) . ' wp-block-navigation-item';

	$wrapper_attributes = get_block_wrapper_attributes(

		array(

			'class' => $css_classes,

			'style' => $style_attribute,

		)

	);

	return $wrapper_attributes;

}

/**

 * Renders the `core/home-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 home url added.

 */

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

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

		return '';

	}

	$wrapper_attributes = block_core_home_link_build_li_wrapper_attributes( $block->context );

	$aria_current = is_home() || ( is_front_page() && 'page' === get_option( 'show_on_front' ) ) ? ' aria-current="page"' : '';

	$html = '<li ' . $wrapper_attributes . '><a class="wp-block-home-link__content wp-block-navigation-item__content" rel="home"' . $aria_current;

	// Start appending HTML attributes to anchor tag.

	$html .= ' href="' . esc_url( home_url() ) . '"';

	// End appending HTML attributes to anchor tag.

	$html .= '>';

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

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

	}

	$html .= '</a></li>';

	return $html;

}

/**

 * Register the home block

 *

 * @uses render_block_core_home_link()

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

 */

function register_block_core_home_link() {

	register_block_type_from_metadata(

		__DIR__ . '/home-link',

		array(

			'render_callback' => 'render_block_core_home_link',

		)

	);

}

add_action( 'init', 'register_block_core_home_link' );