<?php

declare(strict_types=1);

namespace App\Services\VirtualMachine;

use App\Models\ModuleHost;
use App\Models\OrderItem;
use App\Models\Os;
use App\Services\VirtualMachine\Dto\VmInfrastructureContext;
use RuntimeException;

class VmInfrastructureResolver
{
    public function __construct(private readonly VmProvisionLogger $logger)
    {
    }

    public function resolve(OrderItem $item, $product): VmInfrastructureContext
    {
        $os = Os::with(['host.datacenter.vCenter', 'osGroup.host.datacenter.vCenter'])
            ->find($item->os_id);

        if (!$os) {
            throw new RuntimeException(
                "Không tìm thấy OS id={$item->os_id} trong OrderItem #{$item->id}. os_id không hợp lệ."
            );
        }

        // Priority 1: host attached directly to OS
        $host       = $os->host;
        $datacenter = $host?->datacenter;
        $vcenter    = $datacenter?->vCenter;

        // Priority 2: host from OS group fallback
        if (!$host || !$datacenter || !$vcenter) {
            $groupHost  = $os->osGroup?->host;
            $host       = $host ?? $groupHost;
            $datacenter = $datacenter ?? $groupHost?->datacenter;
            $vcenter    = $vcenter ?? $groupHost?->datacenter?->vCenter;

            if ($groupHost) {
                $this->logger->step('Infrastructure fallback: osGroup host', [
                    'os_id'       => $os->id,
                    'os_group_id' => $os->os_group_id,
                    'host_id'     => $groupHost->id,
                ]);
            }
        }

        // Priority 3: host from product (Provisioning tab)
        if ((!$host || !$datacenter || !$vcenter) && $product && $product->module_host_id) {
            $productHost = ModuleHost::with('datacenter.vCenter')->find($product->module_host_id);
            if ($productHost) {
                $host       = $host ?? $productHost;
                $datacenter = $datacenter ?? $productHost->datacenter;
                $vcenter    = $vcenter ?? $productHost->datacenter?->vCenter;

                $this->logger->step('Infrastructure fallback: product host', [
                    'product_id'    => $product->id,
                    'host_id'       => $productHost->id,
                    'datacenter_id' => $productHost->datacenter?->id,
                ]);
            }
        }

        if (!$vcenter || !$host || !$datacenter) {
            throw new RuntimeException(
                "Thiếu thông tin host/datacenter/vcenter từ sản phẩm ID #" . ($product->id ?? 'unknown') . ". "
                . "Vui lòng cấu hình vCenter trong tab Provisioning của sản phẩm, "
                . "hoặc gán host cho OS group của OS được chọn."
            );
        }

        $osGroupName = $os->osGroup?->name ?? '';
        $isWindows   = str_contains(strtolower($osGroupName), 'windows');

        return new VmInfrastructureContext(
            os:         $os,
            host:       $host,
            datacenter: $datacenter,
            vcenter:    $vcenter,
            template:   $os->template_id,
            isWindows:  $isWindows,
            vmUser:     $isWindows ? 'administrator' : 'root',
            vmPort:     $isWindows ? 3389 : 22,
        );
    }
}