<?php

/**

 * Blocks API: WP_Block_Type class

 *

 * @package WordPress

 * @subpackage Blocks

 * @since 5.0.0

 */

/**

 * Core class representing a block type.

 *

 * @since 5.0.0

 *

 * @see register_block_type()

 */

class WP_Block_Type {

	/**

	 * Block type key.

	 *

	 * @since 5.0.0

	 * @var string

	 */

	public $name;

	/**

	 * Block type render callback.

	 *

	 * @since 5.0.0

	 * @var callable

	 */

	public $render_callback;

	/**

	 * Block type attributes property schemas.

	 *

	 * @since 5.0.0

	 * @var array

	 */

	public $attributes;

	/**

	 * Block type editor script handle.

	 *

	 * @since 5.0.0

	 * @var string

	 */

	public $editor_script;

	/**

	 * Block type front end script handle.

	 *

	 * @since 5.0.0

	 * @var string

	 */

	public $script;

	/**

	 * Block type editor style handle.

	 *

	 * @since 5.0.0

	 * @var string

	 */

	public $editor_style;

	/**

	 * Block type front end style handle.

	 *

	 * @since 5.0.0

	 * @var string

	 */

	public $style;

	/**

	 * Constructor.

	 *

	 * Will populate object properties from the provided arguments.

	 *

	 * @since 5.0.0

	 *

	 * @see register_block_type()

	 *

	 * @param string       $block_type Block type name including namespace.

	 * @param array|string $args       Optional. Array or string of arguments for registering a block type.

	 *                                 Default empty array.

	 */

	public function __construct( $block_type, $args = array() ) {

		$this->name = $block_type;

		$this->set_props( $args );

	}

	/**

	 * Renders the block type output for given attributes.

	 *

	 * @since 5.0.0

	 *

	 * @param array  $attributes Optional. Block attributes. Default empty array.

	 * @param string $content    Optional. Block content. Default empty string.

	 * @return string Rendered block type output.

	 */

	public function render( $attributes = array(), $content = '' ) {

		if ( ! $this->is_dynamic() ) {

			return '';

		}

		$attributes = $this->prepare_attributes_for_render( $attributes );

		return (string) call_user_func( $this->render_callback, $attributes, $content );

	}

	/**

	 * Returns true if the block type is dynamic, or false otherwise. A dynamic

	 * block is one which defers its rendering to occur on-demand at runtime.

	 *

	 * @since 5.0.0

	 *

	 * @return boolean Whether block type is dynamic.

	 */

	public function is_dynamic() {

		return is_callable( $this->render_callback );

	}

	/**

	 * Validates attributes against the current block schema, populating

	 * defaulted and missing values.

	 *

	 * @since 5.0.0

	 *

	 * @param  array $attributes Original block attributes.

	 * @return array             Prepared block attributes.

	 */

	public function prepare_attributes_for_render( $attributes ) {

		// If there are no attribute definitions for the block type, skip

		// processing and return vebatim.

		if ( ! isset( $this->attributes ) ) {

			return $attributes;

		}

		foreach ( $attributes as $attribute_name => $value ) {

			// If the attribute is not defined by the block type, it cannot be

			// validated.

			if ( ! isset( $this->attributes[ $attribute_name ] ) ) {

				continue;

			}

			$schema = $this->attributes[ $attribute_name ];

			// Validate value by JSON schema. An invalid value should revert to

			// its default, if one exists. This occurs by virtue of the missing

			// attributes loop immediately following. If there is not a default

			// assigned, the attribute value should remain unset.

			$is_valid = rest_validate_value_from_schema( $value, $schema );

			if ( is_wp_error( $is_valid ) ) {

				unset( $attributes[ $attribute_name ] );

			}

		}

		// Populate values of any missing attributes for which the block type

		// defines a default.

		$missing_schema_attributes = array_diff_key( $this->attributes, $attributes );

		foreach ( $missing_schema_attributes as $attribute_name => $schema ) {

			if ( isset( $schema['default'] ) ) {

				$attributes[ $attribute_name ] = $schema['default'];

			}

		}

		return $attributes;

	}

	/**

	 * Sets block type properties.

	 *

	 * @since 5.0.0

	 *

	 * @param array|string $args Array or string of arguments for registering a block type.

	 */

	public function set_props( $args ) {

		$args = wp_parse_args(

			$args,

			array(

				'render_callback' => null,

			)

		);

		$args['name'] = $this->name;

		foreach ( $args as $property_name => $property_value ) {

			$this->$property_name = $property_value;

		}

	}

	/**

	 * Get all available block attributes including possible layout attribute from Columns block.

	 *

	 * @since 5.0.0

	 *

	 * @return array Array of attributes.

	 */

	public function get_attributes() {

		return is_array( $this->attributes ) ?

			array_merge(

				$this->attributes,

				array(

					'layout' => array(

						'type' => 'string',

					),

				)

			) :

			array(

				'layout' => array(

					'type' => 'string',

				),

			);

	}

}