<?php
/**
 * Block for placing a form (F-FORMS-01).
 *
 * @package ForensixDigital
 */

declare(strict_types=1);

namespace ForensixDigital\Apps\Forms;

defined( 'ABSPATH' ) || exit;

/**
 * The "Forensix form" block. It is rendered on the server with the same code as the shortcode,
 * so nothing is stored in the post apart from the form id.
 */
final class FormBlock {

	public const NAME = 'forensix-digital/form';

	/**
	 * Renders a form by id.
	 *
	 * @var callable(int): string
	 */
	private $renderer;

	/**
	 * Creates the block.
	 *
	 * @param callable(int): string $renderer Renders a form by id.
	 */
	public function __construct( callable $renderer ) {
		$this->renderer = $renderer;
	}

	/**
	 * Registers the block type.
	 */
	public function register(): void {
		if ( ! function_exists( 'register_block_type' ) || \WP_Block_Type_Registry::get_instance()->is_registered( self::NAME ) ) {
			return;
		}
		wp_register_script(
			'fxd-form-block',
			FORENSIX_URL . 'blocks/form/editor.js',
			array( 'wp-blocks', 'wp-element', 'wp-components', 'wp-block-editor', 'wp-i18n' ),
			FORENSIX_VERSION,
			true
		);
		wp_set_script_translations( 'fxd-form-block', 'forensix-digital', FORENSIX_PATH . 'languages' );

		$forms = array();
		if ( is_admin() ) {
			foreach ( ( new FormStore() )->all() as $form ) {
				$forms[] = array(
					'id'    => $form['id'],
					'title' => $form['title'],
				);
			}
		}
		wp_add_inline_script( 'fxd-form-block', 'window.forensixFormBlock = ' . wp_json_encode( array( 'forms' => $forms ) ) . ';', 'before' );

		register_block_type(
			FORENSIX_PATH . 'blocks/form',
			array(
				'editor_script'   => 'fxd-form-block',
				'render_callback' => array( $this, 'render' ),
			)
		);
	}

	/**
	 * Unregisters the block type.
	 */
	public function unregister(): void {
		if ( function_exists( 'unregister_block_type' ) && \WP_Block_Type_Registry::get_instance()->is_registered( self::NAME ) ) {
			unregister_block_type( self::NAME );
		}
	}

	/**
	 * Server-side output.
	 *
	 * @param array $attributes Block attributes.
	 * @phpstan-param array<string, mixed> $attributes
	 */
	public function render( array $attributes ): string {
		$form_id = absint( $attributes['formId'] ?? 0 );
		return $form_id > 0 ? ( $this->renderer )( $form_id ) : '';
	}
}