<?php

namespace App\Services\Hosting\Snapshots;

use App\Models\Customer;
use App\Models\User;
use App\Models\VmSnapshot;
use App\Services\Hosting\Proxmox\ProxmoxClient;
use Illuminate\Support\Str;

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

    public function create(Customer $vm, User $user, bool $auto = false, ?string $label = null): VmSnapshot
    {
        $name = 'snap-'.now()->format('Ymd-His').'-'.Str::lower(Str::random(4));
        $this->proxmox->createSnapshot((int) $vm->vmid, $name);

        $hours = (int) (config('hosting.snapshots.retention_hours') ?? 48);

        return VmSnapshot::query()->create([
            'customer_id' => $vm->id,
            'name' => $label ?? $name,
            'proxmox_snapshot_id' => $name,
            'auto_created' => $auto,
            'expires_at' => now()->addHours($hours),
        ]);
    }

    public function autoBeforeDestructive(Customer $vm, User $user, string $reason): void
    {
        if (! config('hosting.snapshots.auto_before_destructive', true)) {
            return;
        }

        $this->create($vm, $user, true, "auto-{$reason}");
    }

    public function rollback(Customer $vm, VmSnapshot $snapshot): void
    {
        $this->proxmox->rollbackSnapshot((int) $vm->vmid, $snapshot->proxmox_snapshot_id);
    }

    public function delete(Customer $vm, VmSnapshot $snapshot): void
    {
        $this->proxmox->deleteSnapshot((int) $vm->vmid, $snapshot->proxmox_snapshot_id);
        $snapshot->delete();
    }

    public function pruneExpired(): int
    {
        $count = 0;
        $expired = VmSnapshot::query()->where('expires_at', '<=', now())->with('vm')->get();

        foreach ($expired as $snapshot) {
            if ($snapshot->vm?->vmid) {
                try {
                    $this->proxmox->deleteSnapshot((int) $snapshot->vm->vmid, $snapshot->proxmox_snapshot_id);
                } catch (\Throwable) {
                    // snapshot may already be gone in Proxmox
                }
            }
            $snapshot->delete();
            $count++;
        }

        return $count;
    }
}