ladill-transfer/app/Notifications/TransferRecipientNotification.php

<?php

namespace App\Notifications;

use App\Models\Transfer;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class TransferRecipientNotification extends Notification implements ShouldQueue
{
    use Queueable;

    public function __construct(
        private readonly Transfer $transfer,
        private readonly string $milestone,
    ) {}

    public function via(mixed $notifiable): array
    {
        return ['mail'];
    }

    public function toMail(mixed $notifiable): MailMessage
    {
        $transfer = $this->transfer->loadMissing(['files', 'qrCode', 'user']);
        $publicUrl = $transfer->qrCode?->publicUrl() ?? '';

        return (new MailMessage())
            ->subject($this->subjectLine())
            ->view('mail.notifications.transfer-recipient', [
                'transfer' => $transfer,
                'publicUrl' => $publicUrl,
                'milestone' => $this->milestone,
                'senderName' => $transfer->user?->name,
                'daysRemaining' => $this->daysRemaining(),
            ]);
    }

    private function subjectLine(): string
    {
        return match ($this->milestone) {
            'created' => $this->transfer->user?->name
                ? "{$this->transfer->user->name} shared files with you"
                : "Files shared with you: {$this->transfer->title}",
            'grace' => "Download soon — {$this->transfer->title} needs payment",
            '1' => "Last day to download: {$this->transfer->title}",
            '3' => "3 days left to download: {$this->transfer->title}",
            '7' => "Download reminder: {$this->transfer->title}",
            default => "Download reminder: {$this->transfer->title}",
        };
    }

    private function daysRemaining(): ?int
    {
        if (! is_numeric($this->milestone)) {
            return null;
        }

        return (int) $this->milestone;
    }
}