<?php

namespace App\Services\Hosting\Iso;

use App\Exceptions\Hosting\ProvisioningException;
use App\Models\CustomerIsoUpload;
use App\Models\User;
use App\Services\Hosting\Proxmox\ProxmoxClient;
use Illuminate\Http\UploadedFile;

class IsoUploadService
{
    public function __construct(private readonly ProxmoxClient $proxmox) {}

    public function upload(User $user, UploadedFile $file): CustomerIsoUpload
    {
        if (! config('hosting.iso_upload.enabled', true)) {
            throw new ProvisioningException('ISO-Upload ist deaktiviert.', step: 'iso_upload');
        }

        $maxMb = (int) config('hosting.iso_upload.max_size_mb', 10240);
        if ($file->getSize() > $maxMb * 1024 * 1024) {
            throw new ProvisioningException("Maximale ISO-Größe: {$maxMb} MB.", step: 'iso_upload');
        }

        $maxPerCustomer = (int) config('hosting.iso_upload.max_per_customer', 1);
        $existing = CustomerIsoUpload::query()->where('user_id', $user->id)->where('expires_at', '>', now())->count();
        if ($existing >= $maxPerCustomer) {
            throw new ProvisioningException('Nur eine aktive ISO pro Kunde erlaubt.', step: 'iso_upload');
        }

        $storage = config('hosting.proxmox.iso_storage', 'ISO');
        $safeName = preg_replace('/[^a-zA-Z0-9._-]/', '_', $file->getClientOriginalName()) ?: 'upload.iso';
        $path = $file->getRealPath();

        $this->proxmox->uploadIsoToStorage($storage, $safeName, $path);

        $volid = "{$storage}:iso/{$safeName}";
        $hours = (int) config('hosting.iso_upload.retention_hours', 48);

        return CustomerIsoUpload::query()->create([
            'user_id' => $user->id,
            'filename' => $safeName,
            'volid' => $volid,
            'size_bytes' => $file->getSize(),
            'expires_at' => now()->addHours($hours),
        ]);
    }

    public function purgeExpired(): int
    {
        $storage = config('hosting.proxmox.iso_storage', 'ISO');
        $count = 0;

        foreach (CustomerIsoUpload::query()->where('expires_at', '<=', now())->get() as $upload) {
            try {
                $this->proxmox->deleteStorageFile($storage, $upload->volid);
            } catch (\Throwable) {
                //
            }
            $upload->delete();
            $count++;
        }

        return $count;
    }
}