namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use NotificationChannels\FCM\FCMChannel;
use Kreait\Firebase\Messaging\CloudMessage;

class ExampleNotification extends Notification implements ShouldQueue
{
    use Queueable;

    public function via($notifiable): array
    {
        return [FCMChannel::class];
    }

    public function toFCM($notifiable): CloudMessage
    {
        return CloudMessage::new()
            ->withDefaultSounds()
            ->withNotification([
                'title' => 'Hello',
                'body' => 'Message body',
            ])         
            ->withData([
                'key' => 'string value'
            ]);
    }    
}

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Notifications\Notifiable;
use Illuminate\Notifications\Notification;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;
       
    /**
    * Assuming that you have a database table which stores device tokens.
    */
    public function deviceTokens(): HasMany
    {
        return $this->hasMany(DeviceToken::class);
    }
    
    public function routeNotificationForFCM(Notification $notification): string|array|null
    {
         return $this->deviceTokens->pluck('token')->toArray();
    }
    
    /**
    * Optional method to determine which message target to use
    * We will use TOKEN type when not specified
    * @see \Kreait\Firebase\Messaging\MessageTarget::TYPES
    */
    public function routeNotificationForFCMTargetType(Notification $notification): ?string
    {
        return \Kreait\Firebase\Messaging\MessageTarget::TOKEN;
    }
    
    /**
    * Optional method to determine which Firebase project to use
    * We will use default project when not specified
    */
    public function routeNotificationForFCMProject(Notification $notification): ?string;
    {
        return config('firebase.default');
    }   
}

use Illuminate\Support\Facades\Notification;
use Kreait\Firebase\Messaging\MessageTarget;
use App\Notification\ExampleNotification;

Notification::route('FCM', 'topicA')
    ->route('FCMTargetType', MessageTarget::TOPIC)
    ->notify(new ExampleNotification());

Notification::route('FCM', "'TopicA' in topics")
    ->route('FCMTargetType', MessageTarget::CONDITION)
    ->notify(new ExampleNotification());

Notification::route('FCM', ['token_1', 'token_2'])
    ->route('FCMTargetType', MessageTarget::TOKEN)
    ->notify(new ExampleNotification());

namespace App\Providers;

use Illuminate\Notifications\Events;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider
{
    protected $listen = [
        Events\NotificationSent::class => [
            \App\Listeners\FCMNotificationSent::class,
        ],
        Events\NotificationFailed::class => [
            \App\Listeners\FCMNotificationFailed::class,
        ],
    ];    
}

namespace App\Listeners;

use App\Models\User;
use NotificationChannels\FCM\FCMChannel;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Events\NotificationFailed;

class FCMNotificationFailed implements ShouldQueue
{
    public function handle(NotificationFailed $event)
    {
        if ($event->channel !== FCMChannel::class) {
            return;
        }

        /** @var User $user */
        $user = $event->notifiable;
        
        //todo Delete invalid device tokens from database
    }
}

protected $dontReport = [
    \NotificationChannels\FCM\Exception\InvalidRecipientException::class,
];