<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Notification extends Model
{
    use HasFactory;

    protected $table = 'notifications';

    protected $fillable = [
        'title',
        'description',
    ];

    public function users()
    {
        return $this->belongsToMany(User::class, 'notification_user')
            ->withPivot('read_at')
            ->withTimestamps();
    }

    /**
     * Notifications that a user has not read (no pivot row with read_at set).
     */
    public static function scopeUnreadForUser($query, $userId)
    {
        return $query->whereDoesntHave('users', function ($q) use ($userId) {
            $q->where('user_id', $userId)->whereNotNull('notification_user.read_at');
        });
    }
}
