<?php
/**
 * [revys_reviews widget="<id>"] shortcode.
 *
 * @package Revys
 */

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

/**
 * Registers and renders the reviews shortcode.
 */
class Revys_Shortcode {

	/**
	 * Hook registration + front-end styles.
	 *
	 * @return void
	 */
	public static function init() {
		add_shortcode( 'revys_reviews', array( __CLASS__, 'render' ) );
		add_action( 'wp_enqueue_scripts', array( __CLASS__, 'register_styles' ) );
	}

	/**
	 * Register the legacy front-end stylesheet, and enqueue the styles of the
	 * widgets used in the queried post (shortcode or block) so they are
	 * printed in the head. Widgets rendered elsewhere enqueue their styles at
	 * render time (Revys_Render::enqueue_assets).
	 *
	 * @return void
	 */
	public static function register_styles() {
		wp_register_style(
			'revys-front',
			REVYS_PLUGIN_URL . 'assets/revys.css',
			array(),
			REVYS_VERSION
		);

		if ( ! is_singular() ) {
			return;
		}
		$post = get_queried_object();
		if ( ! $post instanceof WP_Post ) {
			return;
		}
		foreach ( self::widget_ids_in( (string) $post->post_content ) as $widget_id ) {
			Revys_Render::enqueue_assets( $widget_id );
		}
	}

	/**
	 * Widget ids used in a post content: `[revys_reviews widget="…"]`
	 * shortcodes and `revys/reviews` blocks (nested blocks included).
	 *
	 * @param string $content Post content.
	 * @return string[]
	 */
	public static function widget_ids_in( $content ) {
		$ids = array();

		if ( false !== strpos( $content, '[revys_reviews' )
			&& preg_match_all( '/' . get_shortcode_regex( array( 'revys_reviews' ) ) . '/', $content, $matches, PREG_SET_ORDER ) ) {
			foreach ( $matches as $m ) {
				if ( '[' === $m[1] && ']' === $m[6] ) {
					continue; // Escaped shortcode `[[revys_reviews]]`.
				}
				$atts = shortcode_parse_atts( $m[3] );
				if ( is_array( $atts ) && ! empty( $atts['widget'] ) ) {
					$ids[] = sanitize_text_field( (string) $atts['widget'] );
				}
			}
		}

		if ( has_block( 'revys/reviews', $content ) ) {
			$stack = parse_blocks( $content );
			while ( $stack ) {
				$block = array_shift( $stack );
				if ( 'revys/reviews' === $block['blockName'] && ! empty( $block['attrs']['widget'] ) ) {
					$ids[] = sanitize_text_field( (string) $block['attrs']['widget'] );
				}
				if ( ! empty( $block['innerBlocks'] ) ) {
					$stack = array_merge( $stack, $block['innerBlocks'] );
				}
			}
		}

		return array_values( array_unique( array_filter( $ids ) ) );
	}

	/**
	 * Render the shortcode.
	 *
	 * @param array $atts Shortcode attributes.
	 * @return string
	 */
	public static function render( $atts ) {
		$atts = shortcode_atts(
			array(
				'widget' => '',
			),
			$atts,
			'revys_reviews'
		);

		$widget_id = sanitize_text_field( (string) $atts['widget'] );
		if ( '' === $widget_id ) {
			return '';
		}

		// Styles are enqueued by Revys_Render (see register_styles above).
		return Revys_Render::render( $widget_id );
	}
}