<?php

namespace RoosterLMS\Events;

use RoosterLMS\Blocks\Context;
use RoosterLMS\Core\Clock;
use RoosterLMS\Domain\Services;

defined( 'ABSPATH' ) || exit;

final class LessonJsonLd {

	public const MAX = 5;

	private static bool $done = false;

	public static function append( $html, $block = array(), $instance = null ) {
		$attrs = is_array( $block ) && is_array( $block['attrs'] ?? null ) ? $block['attrs'] : array();
		if ( ! is_string( $html ) || self::$done || ! empty( $attrs['lessonPost'] ) || ! is_singular() ) {
			return $html;
		}
		$item_id = Context::item_id( array(), $instance instanceof \WP_Block ? $instance : null );
		$item    = $item_id > 0 ? ( Services::curriculum_repo()->items( array( $item_id ) )[ $item_id ] ?? null ) : null;
		if ( null === $item ) {
			return $html;
		}
		self::$done = true;
		$q          = new EventQuery( array(), array(), '', '', 0, '', EventQuery::MAX_MONTHS, self::MAX, 1, false, $item->course_id, $item->unit_id );
		$events     = EventRepository::find( $q, 0, new \DateTimeImmutable( '@' . Clock::timestamp() ), EventRepository::GUEST, false, self::MAX, 0 );
		if ( array() === $events ) {
			return $html;
		}
		$offers = new EventOffers( $events );
		$prices = array();
		foreach ( $events as $e ) {
			$price = $offers->price( $e );
			if ( null !== $price ) {
				$prices[ $e->id() ] = $price;
			}
		}
		JsonLd::queue( $events, EventPosts::of( $events ), $prices );
		return $html;
	}

	public static function reset(): void {
		self::$done = false;
	}
}