<?php

declare(strict_types=1);

namespace App\Jobs\VirtualMachine\Rebuild;

use App\Http\Services\Telegram;
use App\Http\Services\vCenter as VCenterService;
use App\Models\ModuleVmware;
use App\Models\vCenter as VCenterModel;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Log;
use Throwable;

/**
 * RebuildDeleteOldVmJob
 *
 * Final step of the rebuild pipeline. Runs only AFTER the DB has already
 * been swapped to point at the new VM, so even if this job fails the
 * customer's service is fully online on the new VM — the old VM just
 * becomes an orphan that an operator can clean up later.
 *
 * Defensive guard: before deleting, re-read ModuleVmware.vmware_id from DB
 * and refuse to delete if it still matches the "old" id we were told about.
 * That would mean the swap somehow rolled back, and deleting would destroy
 * the live VM.
 */
final class RebuildDeleteOldVmJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public int $tries   = 3;
    public int $timeout = 180;
    public int $backoff = 60;

    public function __construct(
        public readonly int $moduleVmwareId,
        public readonly string $oldVmId,
        public readonly ?int $reinstallLogId = null,
    ) {
    }

    public function handle(VCenterService $vCenter): void
    {
        if ($this->oldVmId === '') {
            Log::info('RebuildDeleteOldVmJob: nothing to delete (oldVmId empty)');
            return;
        }

        $vm = ModuleVmware::find($this->moduleVmwareId);
        if (!$vm) {
            Log::warning('RebuildDeleteOldVmJob: ModuleVmware vanished, skipping', [
                'module_vmware_id' => $this->moduleVmwareId,
            ]);
            return;
        }

        if ((string) $vm->vmware_id === $this->oldVmId) {
            // DB swap never happened — refuse to delete the live VM.
            Log::error('RebuildDeleteOldVmJob: ABORT — module_vmware still references oldVmId', [
                'module_vmware_id' => $this->moduleVmwareId,
                'old_vm_id'        => $this->oldVmId,
            ]);
            return;
        }

        $vcenter = VCenterModel::find($vm->vcenter_id);
        if (!$vcenter || !$vCenter->loginServer($vcenter)) {
            Log::error('RebuildDeleteOldVmJob: cannot login to vCenter', [
                'old_vm_id' => $this->oldVmId,
            ]);
            return;
        }

        try {
            $vCenter->PowerOffVirtualMachine($this->oldVmId);
            $res = $vCenter->DeleteVirtualMachine($this->oldVmId);
            Log::info('RebuildDeleteOldVmJob: old VM deleted', [
                'old_vm_id' => $this->oldVmId,
                'result'    => $res,
            ]);

            (new Telegram)->SendRebuildStepNotification($vm->name ?? '', $vm->ip ?? '', 'Xoá VM cũ', true);
        } catch (Throwable $e) {
            Log::error('RebuildDeleteOldVmJob: delete failed', [
                'old_vm_id' => $this->oldVmId,
                'error'     => $e->getMessage(),
            ]);
            // Re-throw so Laravel retries.
            throw $e;
        }
    }

    public function failed(Throwable $e): void
    {
        Log::error('RebuildDeleteOldVmJob: retries exhausted — manual cleanup required', [
            'module_vmware_id' => $this->moduleVmwareId,
            'old_vm_id'        => $this->oldVmId,
            'error'            => $e->getMessage(),
        ]);

        $vm = ModuleVmware::find($this->moduleVmwareId);
        (new Telegram)->SendRebuildStepNotification(
            $vm->name ?? "VM #{$this->moduleVmwareId}",
            $vm->ip ?? '',
            'Xoá VM cũ',
            false,
            "Old VM {$this->oldVmId} cần xoá thủ công: " . $e->getMessage(),
        );
    }
}