<?php

namespace App\Services\Meet;

use App\Models\QrCode;
use App\Models\User;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Str;

class EventMeetSyncService
{
    public function sync(QrCode $event, User $owner): QrCode
    {
        if ($event->type !== QrCode::TYPE_EVENT) {
            return $event;
        }

        $content = $event->content();
        $format = (string) ($content['format'] ?? 'in_person');

        if (! in_array($format, ['virtual', 'hybrid'], true)) {
            $this->cancelRemovedSessions($event, $owner, []);

            return $event;
        }

        if ((string) config('meet.key', '') === '') {
            return $event;
        }

        $sessions = (array) ($content['virtual_sessions'] ?? []);
        $client = MeetClient::for($owner->public_id);
        $synced = [];
        $activeIds = [];

        foreach ($sessions as $session) {
            if (! is_array($session)) {
                continue;
            }

            $sessionId = trim((string) ($session['id'] ?? ''));
            if ($sessionId === '') {
                $sessionId = 'vs-'.Str::lower(Str::random(12));
            }

            $activeIds[] = $sessionId;
            $title = trim((string) ($session['title'] ?? ''));
            if ($title === '') {
                $synced[] = array_merge($session, ['id' => $sessionId]);

                continue;
            }

            $roomType = in_array($session['meet_room_type'] ?? '', ['town_hall', 'webinar'], true)
                ? (string) $session['meet_room_type']
                : 'town_hall';

            $scheduledAt = $session['scheduled_at'] ?? $content['starts_at'] ?? null;

            try {
                $result = $client->upsertRoom([
                    'title' => $title,
                    'description' => trim((string) ($content['description'] ?? '')) ?: null,
                    'type' => $roomType,
                    'scheduled_at' => $scheduledAt,
                    'duration_minutes' => max(15, (int) ($session['duration_minutes'] ?? 60)),
                    'timezone' => config('app.timezone', 'UTC'),
                    'source' => [
                        'app' => 'events',
                        'entity_type' => 'virtual_session',
                        'entity_id' => $sessionId,
                        'event_id' => (string) $event->id,
                    ],
                ]);
            } catch (\Throwable $e) {
                Log::warning('Events Meet sync failed', [
                    'event_id' => $event->id,
                    'session_id' => $sessionId,
                    'error' => $e->getMessage(),
                ]);
                $synced[] = array_merge($session, ['id' => $sessionId]);

                continue;
            }

            $room = (array) ($result['room'] ?? []);
            $synced[] = array_merge($session, [
                'id' => $sessionId,
                'meet_room_uuid' => $room['uuid'] ?? $session['meet_room_uuid'] ?? null,
                'join_url' => $result['join_url'] ?? $session['join_url'] ?? null,
            ]);
        }

        $this->cancelRemovedSessions($event, $owner, $activeIds);

        $payload = (array) ($event->payload ?? []);
        $payload['content'] = array_merge($content, ['virtual_sessions' => array_values($synced)]);
        $event->payload = $payload;
        $event->save();

        return $event->fresh();
    }

    /** @param  list<string>  $keepIds */
    private function cancelRemovedSessions(QrCode $event, User $owner, array $keepIds): void
    {
        if ((string) config('meet.key', '') === '') {
            return;
        }

        $previous = (array) ($event->content()['virtual_sessions'] ?? []);
        $client = MeetClient::for($owner->public_id);

        foreach ($previous as $session) {
            if (! is_array($session)) {
                continue;
            }

            $sessionId = (string) ($session['id'] ?? '');
            $roomUuid = (string) ($session['meet_room_uuid'] ?? '');

            if ($sessionId === '' || in_array($sessionId, $keepIds, true) || $roomUuid === '') {
                continue;
            }

            try {
                $client->cancelRoom($roomUuid);
            } catch (\Throwable $e) {
                Log::warning('Events Meet cancel failed', [
                    'event_id' => $event->id,
                    'session_id' => $sessionId,
                    'error' => $e->getMessage(),
                ]);
            }
        }
    }
}