<?php

/**

 * Blocks API: WP_Block class

 *

 * @package WordPress

 * @since 5.5.0

 */

/**

 * Class representing a parsed instance of a block.

 *

 * @since 5.5.0

 * @property array $attributes

 */

class WP_Block {

	/**

	 * Original parsed array representation of block.

	 *

	 * @since 5.5.0

	 * @var array

	 */

	public $parsed_block;

	/**

	 * Name of block.

	 *

	 * @example "core/paragraph"

	 *

	 * @since 5.5.0

	 * @var string

	 */

	public $name;

	/**

	 * Block type associated with the instance.

	 *

	 * @since 5.5.0

	 * @var WP_Block_Type

	 */

	public $block_type;

	/**

	 * Block context values.

	 *

	 * @since 5.5.0

	 * @var array

	 */

	public $context = array();

	/**

	 * All available context of the current hierarchy.

	 *

	 * @since 5.5.0

	 * @var array

	 * @access protected

	 */

	protected $available_context;

	/**

	 * List of inner blocks (of this same class)

	 *

	 * @since 5.5.0

	 * @var WP_Block[]

	 */

	public $inner_blocks = array();

	/**

	 * Resultant HTML from inside block comment delimiters after removing inner

	 * blocks.

	 *

	 * @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."

	 *

	 * @since 5.5.0

	 * @var string

	 */

	public $inner_html = '';

	/**

	 * List of string fragments and null markers where inner blocks were found

	 *

	 * @example array(

	 *   'inner_html'    => 'BeforeInnerAfter',

	 *   'inner_blocks'  => array( block, block ),

	 *   'inner_content' => array( 'Before', null, 'Inner', null, 'After' ),

	 * )

	 *

	 * @since 5.5.0

	 * @var array

	 */

	public $inner_content = array();

	/**

	 * Constructor.

	 *

	 * Populates object properties from the provided block instance argument.

	 *

	 * The given array of context values will not necessarily be available on

	 * the instance itself, but is treated as the full set of values provided by

	 * the block's ancestry. This is assigned to the private `available_context`

	 * property. Only values which are configured to consumed by the block via

	 * its registered type will be assigned to the block's `context` property.

	 *

	 * @since 5.5.0

	 *

	 * @param array                  $block             Array of parsed block properties.

	 * @param array                  $available_context Optional array of ancestry context values.

	 * @param WP_Block_Type_Registry $registry          Optional block type registry.

	 */

	public function __construct( $block, $available_context = array(), $registry = null ) {

		$this->parsed_block = $block;

		$this->name         = $block['blockName'];

		if ( is_null( $registry ) ) {

			$registry = WP_Block_Type_Registry::get_instance();

		}

		$this->block_type = $registry->get_registered( $this->name );

		$this->available_context = $available_context;

		if ( ! empty( $this->block_type->uses_context ) ) {

			foreach ( $this->block_type->uses_context as $context_name ) {

				if ( array_key_exists( $context_name, $this->available_context ) ) {

					$this->context[ $context_name ] = $this->available_context[ $context_name ];

				}

			}

		}

		if ( ! empty( $block['innerBlocks'] ) ) {

			$child_context = $this->available_context;

			if ( ! empty( $this->block_type->provides_context ) ) {

				foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) {

					if ( array_key_exists( $attribute_name, $this->attributes ) ) {

						$child_context[ $context_name ] = $this->attributes[ $attribute_name ];

					}

				}

			}

			$this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );

		}

		if ( ! empty( $block['innerHTML'] ) ) {

			$this->inner_html = $block['innerHTML'];

		}

		if ( ! empty( $block['innerContent'] ) ) {

			$this->inner_content = $block['innerContent'];

		}

	}

	/**

	 * Returns a value from an inaccessible property.

	 *

	 * This is used to lazily initialize the `attributes` property of a block,

	 * such that it is only prepared with default attributes at the time that

	 * the property is accessed. For all other inaccessible properties, a `null`

	 * value is returned.

	 *

	 * @since 5.5.0

	 *

	 * @param string $name Property name.

	 * @return array|null Prepared attributes, or null.

	 */

	public function __get( $name ) {

		if ( 'attributes' === $name ) {

			$this->attributes = isset( $this->parsed_block['attrs'] ) ?

				$this->parsed_block['attrs'] :

				array();

			if ( ! is_null( $this->block_type ) ) {

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

			}

			return $this->attributes;

		}

		return null;

	}

	/**

	 * Generates the render output for the block.

	 *

	 * @since 5.5.0

	 *

	 * @param array $options {

	 *   Optional options object.

	 *

	 *   @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.

	 * }

	 * @return string Rendered block output.

	 */

	public function render( $options = array() ) {

		global $post;

		$options = wp_parse_args(

			$options,

			array(

				'dynamic' => true,

			)

		);

		$is_dynamic    = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();

		$block_content = '';

		if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {

			$index = 0;

			foreach ( $this->inner_content as $chunk ) {

				$block_content .= is_string( $chunk ) ?

					$chunk :

					$this->inner_blocks[ $index++ ]->render();

			}

		}

		if ( $is_dynamic ) {

			$block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );

		}

		if ( ! empty( $this->block_type->script ) ) {

			wp_enqueue_script( $this->block_type->script );

		}

		if ( ! empty( $this->block_type->style ) ) {

			wp_enqueue_style( $this->block_type->style );

		}

		/**

		 * Filters the content of a single block.

		 *

		 * @since 5.0.0

		 *

		 * @param string $block_content The block content about to be appended.

		 * @param array  $block         The full block, including name and attributes.

		 */

	}

}