<?php

/**

 * Border block support flag.

 *

 * @package WordPress

 * @since 5.8.0

 */

/**

 * Registers the style attribute used by the border feature if needed for block

 * types that support borders.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_border_support( $block_type ) {

	// Determine if any border related features are supported.

	$has_border_support       = block_has_support( $block_type, array( '__experimentalBorder' ) );

	$has_border_color_support = wp_has_border_feature_support( $block_type, 'color' );

	// Setup attributes and styles within that if needed.

	if ( ! $block_type->attributes ) {

		$block_type->attributes = array();

	}

	if ( $has_border_support && ! array_key_exists( 'style', $block_type->attributes ) ) {

		$block_type->attributes['style'] = array(

			'type' => 'object',

		);

	}

	if ( $has_border_color_support && ! array_key_exists( 'borderColor', $block_type->attributes ) ) {

		$block_type->attributes['borderColor'] = array(

			'type' => 'string',

		);

	}

}

/**

 * Adds CSS classes and inline styles for border styles to the incoming

 * attributes array. This will be applied to the block markup in the front-end.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type       Block type.

 * @param array         $block_attributes Block attributes.

 *

 * @return array Border CSS classes and inline styles.

 */

function wp_apply_border_support( $block_type, $block_attributes ) {

	if ( wp_skip_border_serialization( $block_type ) ) {

		return array();

	}

	$classes = array();

	$styles  = array();

	// Border radius.

	if (

		wp_has_border_feature_support( $block_type, 'radius' ) &&

		isset( $block_attributes['style']['border']['radius'] )

	) {

		$border_radius = (int) $block_attributes['style']['border']['radius'];

		$styles[]      = sprintf( 'border-radius: %dpx;', $border_radius );

	}

	// Border style.

	if (

		wp_has_border_feature_support( $block_type, 'style' ) &&

		isset( $block_attributes['style']['border']['style'] )

	) {

		$border_style = $block_attributes['style']['border']['style'];

		$styles[]     = sprintf( 'border-style: %s;', $border_style );

	}

	// Border width.

	if (

		wp_has_border_feature_support( $block_type, 'width' ) &&

		isset( $block_attributes['style']['border']['width'] )

	) {

		$border_width = intval( $block_attributes['style']['border']['width'] );

		$styles[]     = sprintf( 'border-width: %dpx;', $border_width );

	}

	// Border color.

	if ( wp_has_border_feature_support( $block_type, 'color' ) ) {

		$has_named_border_color  = array_key_exists( 'borderColor', $block_attributes );

		$has_custom_border_color = isset( $block_attributes['style']['border']['color'] );

		if ( $has_named_border_color || $has_custom_border_color ) {

			$classes[] = 'has-border-color';

		}

		if ( $has_named_border_color ) {

			$classes[] = sprintf( 'has-%s-border-color', $block_attributes['borderColor'] );

		} elseif ( $has_custom_border_color ) {

			$border_color = $block_attributes['style']['border']['color'];

			$styles[]     = sprintf( 'border-color: %s;', $border_color );

		}

	}

	// Collect classes and styles.

	$attributes = array();

	if ( ! empty( $classes ) ) {

		$attributes['class'] = implode( ' ', $classes );

	}

	if ( ! empty( $styles ) ) {

		$attributes['style'] = implode( ' ', $styles );

	}

	return $attributes;

}

/**

 * Checks whether serialization of the current block's border properties should

 * occur.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block type.

 *

 * @return boolean

 */

function wp_skip_border_serialization( $block_type ) {

	$border_support = _wp_array_get( $block_type->supports, array( '__experimentalBorder' ), false );

	return is_array( $border_support ) &&

		array_key_exists( '__experimentalSkipSerialization', $border_support ) &&

		$border_support['__experimentalSkipSerialization'];

}

/**

 * Checks whether the current block type supports the border feature requested.

 *

 * If the `__experimentalBorder` support flag is a boolean `true` all border

 * support features are available. Otherwise, the specific feature's support

 * flag nested under `experimentalBorder` must be enabled for the feature

 * to be opted into.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block type to check for support.

 * @param string        $feature    Name of the feature to check support for.

 * @param mixed         $default    Fallback value for feature support, defaults to false.

 *

 * @return boolean Whether or not the feature is supported.

 */

function wp_has_border_feature_support( $block_type, $feature, $default = false ) {

	// Check if all border support features have been opted into via `"__experimentalBorder": true`.

	if (

		property_exists( $block_type, 'supports' ) &&

		( true === _wp_array_get( $block_type->supports, array( '__experimentalBorder' ), $default ) )

	) {

		return true;

	}

	// Check if the specific feature has been opted into individually

	// via nested flag under `__experimentalBorder`.

	return block_has_support( $block_type, array( '__experimentalBorder', $feature ), $default );

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'border',

	array(

		'register_attribute' => 'wp_register_border_support',

		'apply'              => 'wp_apply_border_support',

	)

);