<?php

/**

 * Colors block support flag.

 *

 * @package WordPress

 * @since 5.6.0

 */

/**

 * Registers the style and colors block attributes for block types that support it.

 *

 * @since 5.6.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_colors_support( $block_type ) {

	$color_support = false;

	if ( property_exists( $block_type, 'supports' ) ) {

		$color_support = _wp_array_get( $block_type->supports, array( 'color' ), false );

	}

	$has_text_colors_support       = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'text' ), true ) );

	$has_background_colors_support = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'background' ), true ) );

	$has_gradients_support         = _wp_array_get( $color_support, array( 'gradients' ), false );

	$has_link_colors_support       = _wp_array_get( $color_support, array( 'link' ), false );

	$has_color_support             = $has_text_colors_support ||

		$has_background_colors_support ||

		$has_gradients_support ||

		$has_link_colors_support;

	if ( ! $block_type->attributes ) {

		$block_type->attributes = array();

	}

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

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

			'type' => 'object',

		);

	}

	if ( $has_background_colors_support && ! array_key_exists( 'backgroundColor', $block_type->attributes ) ) {

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

			'type' => 'string',

		);

	}

	if ( $has_text_colors_support && ! array_key_exists( 'textColor', $block_type->attributes ) ) {

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

			'type' => 'string',

		);

	}

	if ( $has_gradients_support && ! array_key_exists( 'gradient', $block_type->attributes ) ) {

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

			'type' => 'string',

		);

	}

}

/**

 * Add CSS classes and inline styles for colors to the incoming attributes array.

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

 *

 * @since 5.6.0

 * @access private

 *

 * @param  WP_Block_Type $block_type       Block type.

 * @param  array         $block_attributes Block attributes.

 *

 * @return array Colors CSS classes and inline styles.

 */

function wp_apply_colors_support( $block_type, $block_attributes ) {

	$color_support = _wp_array_get( $block_type->supports, array( 'color' ), false );

	if (

		is_array( $color_support ) &&

		array_key_exists( '__experimentalSkipSerialization', $color_support ) &&

		$color_support['__experimentalSkipSerialization']

	) {

		return array();

	}

	$has_text_colors_support       = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'text' ), true ) );

	$has_background_colors_support = true === $color_support || ( is_array( $color_support ) && _wp_array_get( $color_support, array( 'background' ), true ) );

	$has_gradients_support         = _wp_array_get( $color_support, array( 'gradients' ), false );

	$classes                       = array();

	$styles                        = array();

	// Text colors.

	// Check support for text colors.

	if ( $has_text_colors_support ) {

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

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

		// Apply required generic class.

		if ( $has_custom_text_color || $has_named_text_color ) {

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

		}

		// Apply color class or inline style.

		if ( $has_named_text_color ) {

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

		} elseif ( $has_custom_text_color ) {

			$styles[] = sprintf( 'color: %s;', $block_attributes['style']['color']['text'] );

		}

	}

	// Background colors.

	if ( $has_background_colors_support ) {

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

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

		// Apply required background class.

		if ( $has_custom_background_color || $has_named_background_color ) {

			$classes[] = 'has-background';

		}

		// Apply background color classes or styles.

		if ( $has_named_background_color ) {

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

		} elseif ( $has_custom_background_color ) {

			$styles[] = sprintf( 'background-color: %s;', $block_attributes['style']['color']['background'] );

		}

	}

	// Gradients.

	if ( $has_gradients_support ) {

		$has_named_gradient  = array_key_exists( 'gradient', $block_attributes );

		$has_custom_gradient = isset( $block_attributes['style']['color']['gradient'] );

		if ( $has_named_gradient || $has_custom_gradient ) {

			$classes[] = 'has-background';

		}

		// Apply required background class.

		if ( $has_named_gradient ) {

			$classes[] = sprintf( 'has-%s-gradient-background', $block_attributes['gradient'] );

		} elseif ( $has_custom_gradient ) {

			$styles[] = sprintf( 'background: %s;', $block_attributes['style']['color']['gradient'] );

		}

	}

	$attributes = array();

	if ( ! empty( $classes ) ) {

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

	}

	if ( ! empty( $styles ) ) {

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

	}

	return $attributes;

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'colors',

	array(

		'register_attribute' => 'wp_register_colors_support',

		'apply'              => 'wp_apply_colors_support',

	)

);