<?php

declare(strict_types=1);

namespace App\Jobs\VirtualMachine\Provision;

use App\Http\Services\Telegram;
use App\Enums\Product\ProductBillingCycle;
use App\Jobs\Mail\Admin\AdminOrderNotificationJob;
use App\Jobs\Mail\SendInformationVirtualMachine;
use App\Models\Invoice;
use App\Models\ModuleVmware;
use App\Models\Service;
use App\Services\VirtualMachine\VmCredentialsEmailDataBuilder;
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\DB;
use Illuminate\Support\Facades\Log;

/**
 * SendVmCredentialsEmailJob
 *
 * Final step in the VM provisioning chain:
 *   [1] Activate service: services.status → 'active', link services.vm_id → module_vmware.id
 *   [2] Activate VM:      module_vmware.status → 1, link module_vmware.service_id → services.id
 *   [3] Send credential email to customer with PDF invoice
 *   [4] Notify admin via AdminOrderNotificationJob
 */
class SendVmCredentialsEmailJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

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

    public function __construct(
        public readonly int $moduleVmwareId,
    ) {}

    public function handle(Telegram $telegram): void
    {
        $vm = ModuleVmware::with([
            'customer',
            'os.osGroup',
            'order.orderItems.service',
        ])->find($this->moduleVmwareId);

        if (!$vm) {
            $msg = "SendVmCredentialsEmailJob: ModuleVmware #{$this->moduleVmwareId} not found";
            Log::error($msg);
            $telegram->SendErrorMessage($msg);
            return;
        }

        $customer = $vm->customer;

        if (!$customer?->email) {
            $msg = "SendVmCredentialsEmailJob: customer or email missing for ModuleVmware #{$this->moduleVmwareId}";
            Log::error($msg, ['module_vmware_id' => $this->moduleVmwareId]);
            $telegram->SendErrorMessage($msg);
            return;
        }

        // ── [1 & 2] Activate service + VM records ────────────────────────────

        $orderItem = $vm->order?->orderItems?->first();
        $service   = $orderItem?->service;

        $this->activateService($vm, $service);

        // ── [3] Build email payload ───────────────────────────────────────────

        $months    = (int) ($orderItem?->months ?? 0);
        $emailData = app(VmCredentialsEmailDataBuilder::class)->build($vm, $orderItem);

        // PDF is generated inside the mail job — never pass binary blobs through queue payload
        $invoice = Invoice::where('order_id', $vm->order_id)->first();

        SendInformationVirtualMachine::dispatch($emailData, $customer, $invoice?->id);

        Log::info('SendVmCredentialsEmailJob: email dispatched', [
            'module_vmware_id' => $this->moduleVmwareId,
            'customer_email'   => $customer->email,
            'ip'               => $vm->ip,
            'invoice_id'       => $invoice?->id,
        ]);

        // ── [4] Admin notification ────────────────────────────────────────────

        $order = $vm->order;
        AdminOrderNotificationJob::dispatch([
            'customer_name'  => $customer->fullname ?? '',
            'customer_email' => $customer->email,
            'client_ip'      => null,
            'order_num'      => $order?->order_num ?? $order?->id ?? 'N/A',
            'product_name'   => $orderItem?->getProductAttribute()?->name ?? 'Cloud VPS',
            'product_type'   => 'Cloud VPS',
            'billing_cycle'  => ProductBillingCycle::vietnameseLabelForMonths($months),
            'total'          => $orderItem?->price ?? 0,
            'created_at'     => $order?->created_at?->format('d/m/Y H:i:s') ?? now()->format('d/m/Y H:i:s'),
            'ip'             => $vm->ip ?? '',
            'username'       => $emailData['service_username'],
            'password'       => $vm->plain_password ?? '',
        ]);

        Log::info('SendVmCredentialsEmailJob: admin notification dispatched', [
            'module_vmware_id' => $this->moduleVmwareId,
        ]);
    }

    public function failed(\Throwable $e): void
    {
        Log::error('SendVmCredentialsEmailJob: failed', [
            'module_vmware_id' => $this->moduleVmwareId,
            'error'            => $e->getMessage(),
        ]);

        try {
            app(Telegram::class)->SendErrorMessage([
                'job'              => 'SendVmCredentialsEmailJob',
                'module_vmware_id' => $this->moduleVmwareId,
                'error'            => $e->getMessage(),
                'file'             => $e->getFile(),
                'line'             => $e->getLine(),
            ]);
        } catch (\Throwable $te) {
            Log::error('SendVmCredentialsEmailJob: could not send Telegram notification: ' . $te->getMessage());
        }
    }

    // ─────────────────────────────────────────────────────────────────────────

    /**
     * Activate the Service record and link it bidirectionally with ModuleVmware.
     *
     * services:      status → 'active', vm_id → module_vmware.id
     * module_vmware: status → 1,        service_id → services.id
     */
    private function activateService(ModuleVmware $vm, ?Service $service): void
    {
        DB::transaction(function () use ($vm, $service) {
            if ($service) {
                $service->update([
                    'status'      => 'active',
                    'vm_id'       => $vm->id,
                    'server_name' => $service->server_name ?: ($vm->hostname ?? $vm->name),
                ]);

                $vm->update([
                    'status'     => 1,
                    'service_id' => $service->id,
                ]);

                Log::info('SendVmCredentialsEmailJob: service activated', [
                    'module_vmware_id' => $vm->id,
                    'service_id'       => $service->id,
                    'ip'               => $vm->ip,
                ]);
            } else {
                // Service record not found — still activate the VM so it is not stuck at pending
                $vm->update(['status' => 1]);

                Log::warning('SendVmCredentialsEmailJob: no Service record found, activated module_vmware only', [
                    'module_vmware_id' => $vm->id,
                ]);
            }
        });
    }

    // ─────────────────────────────────────────────────────────────────────────

}