<?php



final class WP_Block_Bindings_Registry {

	
	private $sources = array();

	
	private static $instance = null;

	
	private $allowed_source_properties = array(
		'label',
		'get_value_callback',
		'uses_context',
	);

	
	private $supported_blocks = array(
		'core/paragraph',
		'core/heading',
		'core/image',
		'core/button',
	);

	
	public function register( string $source_name, array $source_properties ) {
		if ( ! is_string( $source_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block bindings source name must be a string.' ),
				'6.5.0'
			);
			return false;
		}

		if ( preg_match( '/[A-Z]+/', $source_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block bindings source names must not contain uppercase characters.' ),
				'6.5.0'
			);
			return false;
		}

		$name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/';
		if ( ! preg_match( $name_matcher, $source_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Block bindings source names must contain a namespace prefix. Example: my-plugin/my-custom-source' ),
				'6.5.0'
			);
			return false;
		}

		if ( $this->is_registered( $source_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Block bindings source name. */
				sprintf( __( 'Block bindings source "%s" already registered.' ), $source_name ),
				'6.5.0'
			);
			return false;
		}

		// Validates that the source properties contain the label.
		if ( ! isset( $source_properties['label'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The $source_properties must contain a "label".' ),
				'6.5.0'
			);
			return false;
		}

		// Validates that the source properties contain the get_value_callback.
		if ( ! isset( $source_properties['get_value_callback'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The $source_properties must contain a "get_value_callback".' ),
				'6.5.0'
			);
			return false;
		}

		// Validates that the get_value_callback is a valid callback.
		if ( ! is_callable( $source_properties['get_value_callback'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The "get_value_callback" parameter must be a valid callback.' ),
				'6.5.0'
			);
			return false;
		}

		// Validates that the uses_context parameter is an array.
		if ( isset( $source_properties['uses_context'] ) && ! is_array( $source_properties['uses_context'] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The "uses_context" parameter must be an array.' ),
				'6.5.0'
			);
			return false;
		}

		if ( ! empty( array_diff( array_keys( $source_properties ), $this->allowed_source_properties ) ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'The $source_properties array contains invalid properties.' ),
				'6.5.0'
			);
			return false;
		}

		$source = new WP_Block_Bindings_Source(
			$source_name,
			$source_properties
		);

		$this->sources[ $source_name ] = $source;

		return $source;
	}

	
	public function unregister( string $source_name ) {
		if ( ! $this->is_registered( $source_name ) ) {
			_doing_it_wrong(
				__METHOD__,
				/* translators: %s: Block bindings source name. */
				sprintf( __( 'Block binding "%s" not found.' ), $source_name ),
				'6.5.0'
			);
			return false;
		}

		$unregistered_source = $this->sources[ $source_name ];
		unset( $this->sources[ $source_name ] );

		return $unregistered_source;
	}

	
	public function get_all_registered() {
		return $this->sources;
	}

	
	public function get_registered( string $source_name ) {
		if ( ! $this->is_registered( $source_name ) ) {
			return null;
		}

		return $this->sources[ $source_name ];
	}

	
	public function is_registered( $source_name ) {
		return isset( $this->sources[ $source_name ] );
	}

	
	public function __wakeup() {
		if ( ! $this->sources ) {
			return;
		}
		if ( ! is_array( $this->sources ) ) {
			throw new UnexpectedValueException();
		}
		foreach ( $this->sources as $value ) {
			if ( ! $value instanceof WP_Block_Bindings_Source ) {
				throw new UnexpectedValueException();
			}
		}
	}

	
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}