construprogress/app/Notifications/TaskStatusChangedNotification.php

<?php

namespace App\Notifications;

use App\Models\Task;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Notifications\Notification;

class TaskStatusChangedNotification extends Notification implements ShouldBroadcast
{
    use Queueable;

    public function __construct(public Task $task, public string $oldStatus) {}

    public function via($notifiable): array
    {
        return ['database', 'broadcast'];
    }

    public function toArray($notifiable): array
    {
        $label = [
            'pending' => 'pendiente',
            'in_progress' => 'en progreso',
            'completed' => 'completada',
            'cancelled' => 'cancelada',
        ][$this->task->status] ?? $this->task->status;

        $oldLabel = [
            'pending' => 'pendiente',
            'in_progress' => 'en progreso',
            'completed' => 'completada',
            'cancelled' => 'cancelada',
        ][$this->oldStatus] ?? $this->oldStatus;

        return [
            'type' => 'task_status_changed',
            'task_id' => $this->task->id,
            'project_id' => $this->task->project_id,
            'old_status' => $this->oldStatus,
            'new_status' => $this->task->status,
            'message' => "La tarea '{$this->task->title}' cambió de {$oldLabel} a {$label}",
        ];
    }

    public function broadcastOn(): array
    {
        $userIds = [];
        if ($this->task->assigned_to) $userIds[] = $this->task->assigned_to;
        if ($this->task->created_by) $userIds[] = $this->task->created_by;
        return array_map(fn ($id) => new \Illuminate\Broadcasting\PrivateChannel("user.{$id}"), array_unique($userIds));
    }
}