<?php

declare(strict_types=1);

namespace ProCalendarWP\Seo;

use ProCalendarWP\Contracts\Module;
use ProCalendarWP\Events\EventRepositoryInterface;

final class JsonLd implements Module
{
    public function __construct(private readonly EventRepositoryInterface $events)
    {
    }

    public function register(): void
    {
        add_action('wp_head', [$this, 'render']);
    }

    public function render(): void
    {
        if (! is_singular('pcwp_event')) {
            return;
        }
        $event = $this->events->find(get_queried_object_id());
        if ($event === null || ! \ProCalendarWP\Events\EventVisibility::isPublic($event->id)) {
            return;
        }
        $status = [
            'scheduled' => 'https://schema.org/EventScheduled',
            'canceled' => 'https://schema.org/EventCancelled',
            'postponed' => 'https://schema.org/EventPostponed',
            'rescheduled' => 'https://schema.org/EventRescheduled',
            'moved-online' => 'https://schema.org/EventMovedOnline',
        ][$event->status];
        $mode = [
            'in-person' => 'https://schema.org/OfflineEventAttendanceMode',
            'online' => 'https://schema.org/OnlineEventAttendanceMode',
            'hybrid' => 'https://schema.org/MixedEventAttendanceMode',
        ][$event->mode];
        $image = get_the_post_thumbnail_url($event->id, 'full');
        $data = [
            '@context' => 'https://schema.org',
            '@type' => 'Event',
            'name' => $event->title,
            'description' => wp_strip_all_tags($event->excerpt !== '' ? $event->excerpt : $event->description),
            'startDate' => $event->startLocal->format(DATE_ATOM),
            'endDate' => $event->endLocal->format(DATE_ATOM),
            'eventStatus' => $status,
            'eventAttendanceMode' => $mode,
            'url' => get_permalink($event->id),
            'image' => is_string($image) && $image !== '' ? [$image] : [],
        ];
        if ($event->virtualUrl !== '') {
            $data['location'] = ['@type' => 'VirtualLocation', 'url' => $event->virtualUrl];
        }
        $location = \ProCalendarWP\Maps\Location::resolve($event->id);
        if ($event->mode !== 'online' && ($location['formatted'] !== '' || $location['line'] !== '' || $location['latitude'] !== null)) {
            $place = ['@type' => 'Place', 'address' => array_filter([
                '@type' => 'PostalAddress', 'streetAddress' => $location['line'] ?: $location['formatted'],
                'addressLocality' => $location['city'], 'addressRegion' => $location['region'],
                'postalCode' => $location['postal_code'], 'addressCountry' => $location['country'],
            ])];
            if ($location['latitude'] !== null && $location['longitude'] !== null) {
                $place['geo'] = ['@type' => 'GeoCoordinates', 'latitude' => $location['latitude'], 'longitude' => $location['longitude']];
            }
            $data['location'] = isset($data['location']) ? [$place, $data['location']] : $place;
        }
        if ($event->cost !== '') {
            $data['offers'] = ['@type' => 'Offer', 'price' => $event->cost, 'priceCurrency' => $event->currency, 'url' => $event->website ?: get_permalink($event->id), 'availability' => 'https://schema.org/InStock'];
        }
        if ($event->organizerIds !== []) {
            $data['organizer'] = array_map(static fn (int $id): array => array_filter(['@type' => 'Organization', 'name' => get_the_title($id), 'url' => get_post_status($id) === 'publish' && ! post_password_required($id) ? get_permalink($id) : '']), $event->organizerIds);
        }
        if ($event->status === 'rescheduled' && ($previous = get_post_meta($event->id, '_pcwp_previous_start', true)) !== '') {
            try {
                $data['previousStartDate'] = (new \DateTimeImmutable((string) $previous, $event->startLocal->getTimezone()))->format(DATE_ATOM);
            } catch (\Exception) {
                // An incomplete editorial previous date is omitted.
            }
        }
        if (get_post_meta($event->id, '_pcwp_rsvp_enabled', true)) {
            $capacity = absint(get_post_meta($event->id, '_pcwp_rsvp_capacity', true));
            $closed = in_array($event->status, ['canceled', 'postponed'], true) || $event->endLocal->getTimestamp() < time();
            $data['offers']['availability'] = $closed ? 'https://schema.org/Discontinued' : ($capacity > 0 && \ProCalendarWP\Rsvp\RsvpService::activeCount($event->id) >= $capacity ? 'https://schema.org/SoldOut' : 'https://schema.org/InStock');
            $data['offers']['@type'] = 'Offer';
            $data['offers']['url'] = get_permalink($event->id);
        }
        if (($event->schedule['type'] ?? '') === 'daily') {
            $data['@id'] = get_permalink($event->id) . '#event';
            // The parent describes the date span; only child events claim timed opening intervals.
            $data['startDate'] = $event->schedule['startDate'];
            $data['endDate'] = $event->schedule['endDate'];
            $data['subEvent'] = [];
            foreach (\ProCalendarWP\Events\DailySchedule::intervals($event->schedule, $event->timezone) as $slot) {
                $child = $data;
                unset($child['@context'], $child['subEvent']);
                $child['@id'] = get_permalink($event->id) . '#slot-' . $slot['id'];
                $child['startDate'] = $slot['time']->start->format(DATE_ATOM);
                $child['endDate'] = $slot['time']->end->format(DATE_ATOM);
                $child['superEvent'] = ['@id' => $data['@id']];
                $data['subEvent'][] = $child;
            }
        }
        $data = apply_filters('pcwp_json_ld_event', $data, $event);
        $json = wp_json_encode($data, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_UNESCAPED_UNICODE);
        if ($json === false) {
            return;
        }
        // Hex-escaped HTML characters prevent event or filter data closing the script element.
        echo '<script type="application/ld+json">' . $json . '</script>' . "\n"; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- JSON is encoded for this script context above.
    }
}