<?php

declare(strict_types=1);

namespace App\Jobs\VirtualMachine\Provision;

use App\Http\Services\vCenter as VCenterService;
use App\Services\VmProvisionService;
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;

/**
 * WaitVmReadyJob
 *
 * Polls vSphere REST API every 15 s until VMware Tools is running
 * and the guest IP is available. No direct TCP port check is required
 * because password changes are performed via Invoke-VMScript (vSphere
 * path), not direct SSH/WinRM into the VM.
 *
 * Max 40 attempts × 15 s ≈ 10 minutes before giving up.
 * On success → dispatches ChangePasswordViaVsphereJob.
 */
class WaitVmReadyJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    /** 40 attempts × 15 s release delay ≈ 10 min total */
    public int $tries = 40;

    /** Each poll attempt must finish within 30 s */
    public int $timeout = 30;

    public function __construct(
        public readonly int    $moduleVmwareId,
        public readonly string $vmId,
        public readonly int    $vcenterId,
        public readonly string $osFamily,  // VmProvisionService::OS_LINUX | OS_WINDOWS
        public readonly string $username,  // root | Administrator
    ) {}

    // -------------------------------------------------------------------------

    public function handle(VCenterService $vCenterService, VmProvisionService $provision): void
    {
        $attempt = $this->attempts();

        Log::info('WaitVmReadyJob: polling', [
            'vm_id'     => $this->vmId,
            'attempt'   => $attempt,
            'os_family' => $this->osFamily,
        ]);

        // ── 1. Login to vCenter ───────────────────────────────────────────────
        $vcenter = \App\Models\vCenter::find($this->vcenterId);

        if (!$vcenter) {
            Log::error('WaitVmReadyJob: vCenter model not found', ['vcenter_id' => $this->vcenterId]);
            $this->fail(new \RuntimeException("vCenter id={$this->vcenterId} not found"));
            return;
        }

        try {
            $provision->loginVCenter($vcenter, $vCenterService);
        } catch (\Throwable $e) {
            Log::warning('WaitVmReadyJob: vCenter login failed, will retry', [
                'vm_id' => $this->vmId,
                'error' => $e->getMessage(),
            ]);
            $this->releaseOrFail(15, $attempt);
            return;
        }

        // ── 2. Check VMware Tools + guest IP ─────────────────────────────────
        // Invoke-VMScript requires VMware Tools to be running inside the guest.
        $guest = $provision->getVmGuestInfo($vCenterService, $this->vmId);

        Log::info('WaitVmReadyJob: guest info', [
            'vm_id'         => $this->vmId,
            'attempt'       => $attempt,
            'tools_running' => $guest['tools_running'],
            'ip_address'    => $guest['ip_address'],
        ]);

        if (!$guest['tools_running'] || $guest['ip_address'] === null) {
            Log::info('WaitVmReadyJob: VMware Tools not ready yet', ['vm_id' => $this->vmId]);
            $this->releaseOrFail(15, $attempt);
            return;
        }

        $guestIp = $guest['ip_address'];

        // ── 3. VM ready — dispatch password-change job ────────────────────────
        Log::info('WaitVmReadyJob: VMware Tools ready, dispatching ChangePasswordViaVsphereJob', [
            'vm_id'    => $this->vmId,
            'guest_ip' => $guestIp,
        ]);

        ChangePasswordViaVsphereJob::dispatch(
            $this->moduleVmwareId,
            $this->vmId,
            $this->osFamily,
        );
    }

    // -------------------------------------------------------------------------

    public function failed(\Throwable $e): void
    {
        Log::error('WaitVmReadyJob: exceeded max attempts, marking VM failed', [
            'vm_id'            => $this->vmId,
            'module_vmware_id' => $this->moduleVmwareId,
            'error'            => $e->getMessage(),
        ]);

        \App\Models\ModuleVmware::where('id', $this->moduleVmwareId)
            ->update(['status' => 0]);
    }

    // -------------------------------------------------------------------------

    private function releaseOrFail(int $delaySeconds, int $attempt): void
    {
        if ($attempt >= $this->tries) {
            $this->fail(new \RuntimeException(
                "VM {$this->vmId} not ready after {$this->tries} attempts (~10 min)",
            ));
            return;
        }

        $this->release($delaySeconds);
    }
}