<?php
/**
 * Gutenberg Block Integration.
 *
 * @package AISupportAssistant\Frontend
 */

namespace AISupportAssistant\Frontend;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class Block
 */
class Block {

	/**
	 * Single instance of the class.
	 *
	 * @var Block|null
	 */
	private static ?Block $instance = null;

	/**
	 * Get active instance of the class.
	 *
	 * @return Block
	 */
	public static function get_instance(): Block {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	private function __construct() {
		add_action( 'init', array( $this, 'register_gutenberg_block' ) );
	}

	/**
	 * Register Gutenberg Block asset and block type.
	 *
	 * @return void
	 */
	public function register_gutenberg_block(): void {
		$js_ver = file_exists( AI_SUPPORT_ASSISTANT_PATH . 'assets/js/blocks.js' ) ? (string) filemtime( AI_SUPPORT_ASSISTANT_PATH . 'assets/js/blocks.js' ) : AI_SUPPORT_ASSISTANT_VERSION;

		wp_register_script(
			'ai-support-assistant-block-js',
			AI_SUPPORT_ASSISTANT_URL . 'assets/js/blocks.js',
			array( 'wp-blocks', 'wp-element', 'wp-components', 'wp-block-editor', 'wp-editor', 'wp-i18n' ),
			$js_ver,
			true
		);

		$settings      = \AISupportAssistant\Admin\Settings::get_instance();
		$default_title = $settings->get( 'chat_widget_title', __( 'AI Support Assistant', 'ai-support-assistant' ) );
		if ( empty( $default_title ) ) {
			$default_title = __( 'AI Support Assistant', 'ai-support-assistant' );
		}

		wp_localize_script(
			'ai-support-assistant-block-js',
			'AISupportAssistantBlockConfig',
			array(
				'defaultTitle' => esc_html( $default_title ),
			)
		);

		// If block.json exists, attempt registering via block.json first.
		$block_json = AI_SUPPORT_ASSISTANT_PATH . 'blocks/block.json';
		if ( file_exists( $block_json ) && function_exists( 'register_block_type_from_metadata' ) ) {
			register_block_type_from_metadata(
				$block_json,
				array(
					'editor_script'   => 'ai-support-assistant-block-js',
					'render_callback' => array( $this, 'render_block' ),
				)
			);
		} else {
			register_block_type(
				'ai-support-assistant/widget',
				array(
					'editor_script'   => 'ai-support-assistant-block-js',
					'render_callback' => array( $this, 'render_block' ),
					'title'           => __( 'AI Support Assistant Widget', 'ai-support-assistant' ),
					'description'     => __( 'Embed the AI Support Assistant assistant widget into any page or post.', 'ai-support-assistant' ),
					'category'        => 'widgets',
					'icon'            => 'format-chat',
					'keywords'        => array( 'chat', 'ai', 'support', 'assistant' ),
					'attributes'      => array(
						'title'  => array( 'type' => 'string', 'default' => '' ),
						'theme'  => array( 'type' => 'string', 'default' => 'light' ),
						'width'  => array( 'type' => 'string', 'default' => '450px' ),
						'height' => array( 'type' => 'string', 'default' => '600px' ),
					),
				)
			);
		}
	}

	/**
	 * Dynamic block render callback.
	 *
	 * @param array $attributes Block attributes from editor.
	 * @return string HTML rendered output.
	 */
	public function render_block( array $attributes ): string {
		$shortcode = Shortcode::get_instance();

		$mapped_atts = array();
		if ( isset( $attributes['title'] ) && trim( (string) $attributes['title'] ) !== '' ) {
			$mapped_atts['title'] = trim( (string) $attributes['title'] );
		}
		if ( isset( $attributes['theme'] ) && trim( (string) $attributes['theme'] ) !== '' ) {
			$mapped_atts['theme'] = trim( (string) $attributes['theme'] );
		}
		if ( isset( $attributes['width'] ) && trim( (string) $attributes['width'] ) !== '' ) {
			$mapped_atts['width'] = trim( (string) $attributes['width'] );
		}
		if ( isset( $attributes['height'] ) && trim( (string) $attributes['height'] ) !== '' ) {
			$mapped_atts['height'] = trim( (string) $attributes['height'] );
		}

		return $shortcode->render_shortcode( $mapped_atts );
	}
}