<?php
/**
 * Conditional frontend asset loading.
 *
 * @package AccordionFaq
 */

namespace AccordionFaq\Frontend;

defined( 'ABSPATH' ) || exit;

/**
 * Class Assets
 */
class Assets {

	const HANDLE = 'accordion-faq';

	/**
	 * Whether the assets have been registered this request.
	 *
	 * @var bool
	 */
	private static $registered = false;

	/**
	 * Whether the localized data has been attached this request.
	 *
	 * @var bool
	 */
	private static $localized = false;

	/**
	 * Register hooks.
	 *
	 * @return void
	 */
	public function register() {
		add_action( 'wp_enqueue_scripts', array( $this, 'register_assets' ), 5 );
		add_action( 'wp_enqueue_scripts', array( $this, 'maybe_autoload' ), 20 );
	}

	/**
	 * Register (not enqueue) the handles so they can be enqueued on demand.
	 *
	 * @return void
	 */
	public function register_assets() {
		$css = ACCORDION_FAQ_PATH . 'assets/css/accordion-faq.css';
		$js  = ACCORDION_FAQ_PATH . 'assets/js/accordion-faq.js';

		wp_register_style(
			self::HANDLE,
			ACCORDION_FAQ_URL . 'assets/css/accordion-faq.css',
			array(),
			is_readable( $css ) ? (string) filemtime( $css ) : ACCORDION_FAQ_VERSION
		);

		wp_register_script(
			self::HANDLE,
			ACCORDION_FAQ_URL . 'assets/js/accordion-faq.js',
			array(),
			is_readable( $js ) ? (string) filemtime( $js ) : ACCORDION_FAQ_VERSION,
			true
		);

		self::localize( self::HANDLE );

		self::$registered = true;
	}

	/**
	 * Attach the localized strings/config to a script handle.
	 *
	 * @param string $handle Script handle.
	 * @return void
	 */
	public static function localize( $handle ) {
		if ( self::$localized ) {
			return;
		}
		self::$localized = true;
		wp_localize_script(
			$handle,
			'AccordionFaqL10n',
			array(
				'noResults'   => __( 'No FAQs match your search.', 'accordion-faq-plugin' ),
				'resultsOne'  => __( '1 FAQ found.', 'accordion-faq-plugin' ),
				/* translators: %d: number of FAQs matching the search query. */
				'resultsMany' => __( '%d FAQs found.', 'accordion-faq-plugin' ),
				'expandAll'   => __( 'Expand all', 'accordion-faq-plugin' ),
				'collapseAll' => __( 'Collapse all', 'accordion-faq-plugin' ),
				'rest'        => esc_url_raw( rest_url( 'accordion-faq/v1/' ) ),
				'nonce'       => wp_create_nonce( 'wp_rest' ),
			)
		);
	}

	/**
	 * Auto-enqueue on singular content that contains our shortcode or block.
	 *
	 * @return void
	 */
	public function maybe_autoload() {
		if ( is_singular() ) {
			$post = get_post();
			if ( $post instanceof \WP_Post ) {
				$content = (string) $post->post_content;
				if (
					has_shortcode( $content, 'quick_faq' ) ||
					has_shortcode( $content, 'accordion_faq' ) ||
					has_shortcode( $content, 'accordion_faq_submit' ) ||
					has_block( 'accordion-faq/faq', $post )
				) {
					self::enqueue();
				}
			}
		}
	}

	/**
	 * Enqueue the frontend assets. Safe to call multiple times and late
	 * (WordPress prints late-enqueued styles/scripts in the footer).
	 *
	 * @return void
	 */
	public static function enqueue() {
		if ( ! self::$registered ) {
			// Registration hasn't run yet (e.g. very early call); register now.
			$assets = new self();
			$assets->register_assets();
		}
		wp_enqueue_style( self::HANDLE );
		wp_enqueue_script( self::HANDLE );
	}
}