<?php
/**
 * Gutenberg block registration (dynamic; renders via the shared renderer).
 *
 * @package AccordionFaq
 */

namespace AccordionFaq\Blocks;

defined( 'ABSPATH' ) || exit;

use AccordionFaq\Frontend\Renderer;
use AccordionFaq\Setup\Taxonomy;

/**
 * Class Block
 */
class Block {

	const HANDLE = 'accordion-faq-block';

	/**
	 * Renderer.
	 *
	 * @var Renderer
	 */
	private $renderer;

	/**
	 * Constructor.
	 *
	 * @param Renderer $renderer Shared renderer.
	 */
	public function __construct( Renderer $renderer ) {
		$this->renderer = $renderer;
	}

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public function register() {
		add_action( 'init', array( $this, 'register_block' ) );
	}

	/**
	 * Register the editor script and the block.
	 *
	 * @return void
	 */
	public function register_block() {
		$dir = ACCORDION_FAQ_PATH . 'blocks/faq';

		if ( ! is_readable( $dir . '/block.json' ) ) {
			return;
		}

		$js = $dir . '/index.js';
		wp_register_script(
			self::HANDLE,
			ACCORDION_FAQ_URL . 'blocks/faq/index.js',
			array( 'wp-blocks', 'wp-element', 'wp-block-editor', 'wp-components', 'wp-server-side-render', 'wp-i18n', 'wp-api-fetch' ),
			is_readable( $js ) ? (string) filemtime( $js ) : ACCORDION_FAQ_VERSION,
			true
		);

		wp_localize_script(
			self::HANDLE,
			'AccordionFaqBlock',
			array(
				'categories'    => $this->category_options(),
				'aiEnabled'     => \AccordionFaq\Support\Options::boolean( 'enable_ai' ),
				'generateRoute' => '/' . \AccordionFaq\Rest\Controller::NS . '/generate',
				'restBase'      => 'quick_faq',
				'taxRestBase'   => Taxonomy::TAXONOMY,
				'canCreate'     => current_user_can( 'publish_posts' ),
			)
		);

		// Register the frontend stylesheet + script so the block loads them via
		// WordPress core's block-asset mechanism (reliable regardless of render
		// timing), styled in the editor preview, and only when the block present.
		$css = ACCORDION_FAQ_PATH . 'assets/css/accordion-faq.css';
		$view_js = ACCORDION_FAQ_PATH . 'assets/js/accordion-faq.js';

		if ( ! wp_style_is( \AccordionFaq\Frontend\Assets::HANDLE, 'registered' ) ) {
			wp_register_style(
				\AccordionFaq\Frontend\Assets::HANDLE,
				ACCORDION_FAQ_URL . 'assets/css/accordion-faq.css',
				array(),
				is_readable( $css ) ? (string) filemtime( $css ) : ACCORDION_FAQ_VERSION
			);
		}

		if ( ! wp_script_is( \AccordionFaq\Frontend\Assets::HANDLE, 'registered' ) ) {
			wp_register_script(
				\AccordionFaq\Frontend\Assets::HANDLE,
				ACCORDION_FAQ_URL . 'assets/js/accordion-faq.js',
				array(),
				is_readable( $view_js ) ? (string) filemtime( $view_js ) : ACCORDION_FAQ_VERSION,
				true
			);
			\AccordionFaq\Frontend\Assets::localize( \AccordionFaq\Frontend\Assets::HANDLE );
		}

		register_block_type(
			$dir,
			array(
				'editor_script'   => self::HANDLE,
				'style'           => \AccordionFaq\Frontend\Assets::HANDLE,
				'editor_style'    => \AccordionFaq\Frontend\Assets::HANDLE,
				'view_script'     => \AccordionFaq\Frontend\Assets::HANDLE,
				'render_callback' => array( $this, 'render' ),
			)
		);
	}

	/**
	 * Provide FAQ categories for the editor Inspector.
	 *
	 * @return array[]
	 */
	private function category_options() {
		$terms = get_terms(
			array(
				'taxonomy'   => Taxonomy::TAXONOMY,
				'hide_empty' => false,
			)
		);

		$out = array();
		if ( ! is_wp_error( $terms ) ) {
			foreach ( $terms as $term ) {
				$out[] = array(
					'id'   => (int) $term->term_id,
					'slug' => $term->slug,
					'name' => $term->name,
				);
			}
		}
		return $out;
	}

	/**
	 * Server-side render callback.
	 *
	 * @param array $attributes Block attributes.
	 * @return string
	 */
	public function render( $attributes ) {
		$attributes = is_array( $attributes ) ? $attributes : array();

		$raw = array(
			'term'       => isset( $attributes['term'] ) ? absint( $attributes['term'] ) : 0,
			'category'   => isset( $attributes['category'] ) ? $attributes['category'] : '',
			'style'      => isset( $attributes['style'] ) ? $attributes['style'] : '',
			'mode'       => isset( $attributes['mode'] ) ? $attributes['mode'] : '',
			'engine'     => isset( $attributes['engine'] ) ? $attributes['engine'] : '',
			'heading'    => isset( $attributes['heading'] ) ? $attributes['heading'] : '',
			'icon'       => isset( $attributes['icon'] ) ? $attributes['icon'] : '',
			'orderby'    => isset( $attributes['orderby'] ) ? $attributes['orderby'] : 'date',
			'order'      => isset( $attributes['order'] ) ? $attributes['order'] : 'ASC',
			'limit'      => isset( $attributes['limit'] ) ? (int) $attributes['limit'] : -1,
			'open_first' => ! empty( $attributes['openFirst'] ),
			'search'     => ! empty( $attributes['search'] ),
			'filter'     => ! empty( $attributes['filter'] ),
			'expand_all' => ! empty( $attributes['expandAll'] ),
			'toc'        => ! empty( $attributes['toc'] ),
			'schema'     => isset( $attributes['schema'] ) ? (bool) $attributes['schema'] : true,
		);

		// Drop empty string overrides so settings defaults apply.
		foreach ( array( 'style', 'mode', 'engine', 'heading', 'icon' ) as $key ) {
			if ( '' === $raw[ $key ] ) {
				unset( $raw[ $key ] );
			}
		}

		$html = $this->renderer->render( $raw );

		if ( '' === $html ) {
			if ( function_exists( 'wp_is_block_theme' ) && is_admin() ) {
				return '<p class="afaq__empty">' . esc_html__( 'No FAQs found for the selected options.', 'accordion-faq-plugin' ) . '</p>';
			}
			return '';
		}

		$wrapper = function_exists( 'get_block_wrapper_attributes' ) ? get_block_wrapper_attributes() : '';

		return '<div ' . $wrapper . '>' . $html . '</div>';
	}
}