<?php

/**

 * Blocks API: WP_Block_Styles_Registry class

 *

 * @package WordPress

 * @subpackage Blocks

 * @since 5.3.0

 */

/**

 * Class used for interacting with block styles.

 *

 * @since 5.3.0

 */

final class WP_Block_Styles_Registry {

	/**

	 * Registered block styles, as `$block_name => $block_style_name => $block_style_properties` multidimensional arrays.

	 *

	 * @since 5.3.0

	 * @var array

	 */

	private $registered_block_styles = array();

	/**

	 * Container for the main instance of the class.

	 *

	 * @since 5.3.0

	 * @var WP_Block_Styles_Registry|null

	 */

	private static $instance = null;

	/**

	 * Registers a block style.

	 *

	 * @since 5.3.0

	 *

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

	 * @param array  $style_properties Array containing the properties of the style name, label,

	 *                                 style (name of the stylesheet to be enqueued),

	 *                                 inline_style (string containing the CSS to be added).

	 * @return boolean True if the block style was registered with success and false otherwise.

	 */

	public function register( $block_name, $style_properties ) {

		if ( ! isset( $block_name ) || ! is_string( $block_name ) ) {

			$message = __( 'Block name must be a string.' );

			_doing_it_wrong( __METHOD__, $message, '5.3.0' );

			return false;

		}

		if ( ! isset( $style_properties['name'] ) || ! is_string( $style_properties['name'] ) ) {

			$message = __( 'Block style name must be a string.' );

			_doing_it_wrong( __METHOD__, $message, '5.3.0' );

			return false;

		}

		$block_style_name = $style_properties['name'];

		if ( ! isset( $this->registered_block_styles[ $block_name ] ) ) {

			$this->registered_block_styles[ $block_name ] = array();

		}

		$this->registered_block_styles[ $block_name ][ $block_style_name ] = $style_properties;

		return true;

	}

	/**

	 * Unregisters a block style.

	 *

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

	 * @param string $block_style_name Block style name.

	 * @return boolean True if the block style was unregistered with success and false otherwise.

	 */

	public function unregister( $block_name, $block_style_name ) {

		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {

			/* translators: 1: Block name, 2: Block style name. */

			$message = sprintf( __( 'Block "%1$s" does not contain a style named "%2$s".' ), $block_name, $block_style_name );

			_doing_it_wrong( __METHOD__, $message, '5.3.0' );

			return false;

		}

		unset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );

		return true;

	}

	/**

	 * Retrieves an array containing the properties of a registered block style.

	 *

	 * @since 5.3.0

	 *

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

	 * @param string $block_style_name Block style name.

	 * @return array Registered block style properties.

	 */

	public function get_registered( $block_name, $block_style_name ) {

		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {

			return null;

		}

		return $this->registered_block_styles[ $block_name ][ $block_style_name ];

	}

	/**

	 * Retrieves all registered block styles.

	 *

	 * @since 5.3.0

	 *

	 * @return array Array of arrays containing the registered block styles properties grouped per block,

	 *               and per style.

	 */

	public function get_all_registered() {

		return $this->registered_block_styles;

	}

	/**

	 * Retrieves registered block styles for a specific block.

	 *

	 * @since 5.3.0

	 *

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

	 * @return array Array whose keys are block style names and whose value are block style properties.

	 */

	public function get_registered_styles_for_block( $block_name ) {

		if ( isset( $this->registered_block_styles[ $block_name ] ) ) {

			return $this->registered_block_styles[ $block_name ];

		}

		return array();

	}

	/**

	 * Checks if a block style is registered.

	 *

	 * @since 5.3.0

	 *

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

	 * @param string $block_style_name Block style name.

	 * @return bool True if the block style is registered, false otherwise.

	 */

	public function is_registered( $block_name, $block_style_name ) {

		return isset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );

	}

	/**

	 * Utility method to retrieve the main instance of the class.

	 *

	 * The instance will be created if it does not exist yet.

	 *

	 * @since 5.3.0

	 *

	 * @return WP_Block_Styles_Registry The main instance.

	 */

	public static function get_instance() {

		if ( null === self::$instance ) {

			self::$instance = new self();

		}

		return self::$instance;

	}

}