<?php

namespace App\Http\Controllers\Api;

use App\Enums\UserRole;
use App\Http\Controllers\Controller;
use App\Http\Requests\Whmcs\ProvisionServiceRequest;
use App\Jobs\ProvisionCustomerJob;
use App\Models\Customer;
use App\Models\HostingPlan;
use App\Models\User;
use App\Models\WhmcsService;
use App\Services\Hosting\Provisioning\DeprovisionService;
use App\Services\Hosting\Provisioning\VmidReservationService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;

class WhmcsServiceController extends Controller
{
    public function provision(ProvisionServiceRequest $request): JsonResponse
    {
        $plan = HostingPlan::query()->where('slug', $request->validated('plan_slug'))->firstOrFail();
        $domain = $request->domain();

        if ($domain && Customer::query()->where('domain', $domain)->exists()) {
            return response()->json(['error' => 'Domain already taken.'], 422);
        }

        $result = DB::transaction(function () use ($request, $plan, $domain) {
            $user = User::query()->updateOrCreate(
                ['whmcs_client_id' => $request->integer('whmcs_client_id')],
                [
                    'name' => $request->validated('client_name'),
                    'email' => $request->validated('client_email'),
                    'password' => Hash::make(Str::random(32)),
                    'role' => UserRole::Customer,
                    'is_active' => true,
                ],
            );

            $customer = Customer::query()->create([
                'user_id' => $user->id,
                'hosting_plan_id' => $plan->id,
                'name' => $request->validated('hostname'),
                'domain' => $domain ?? 'direct-'.Str::slug($request->validated('hostname')).'-'.Str::lower(Str::random(6)).'.internal',
                'behind_traefik' => $request->boolean('behind_traefik', true),
                'provision_mode' => $request->validated('provision_mode'),
                'attached_iso' => $request->validated('iso_volid'),
                'cpu' => $plan->cpu,
                'ram' => $plan->ram,
                'disk' => $plan->disk,
                'status' => 'pending',
                'provisioning_step' => 'queued',
            ]);

            $whmcsService = WhmcsService::query()->create([
                'whmcs_service_id' => $request->integer('whmcs_service_id'),
                'whmcs_client_id' => $request->integer('whmcs_client_id'),
                'whmcs_order_id' => $request->input('whmcs_order_id'),
                'customer_id' => $customer->id,
                'user_id' => $user->id,
                'hosting_plan_id' => $plan->id,
                'status' => 'provisioning',
                'config' => $request->only([
                    'provision_mode', 'template_slug', 'iso_volid', 'behind_traefik', 'subdomain',
                ]),
            ]);

            $customer->update(['whmcs_service_id' => $whmcsService->id]);

            $vmid = app(VmidReservationService::class)->reserveForCustomer($customer);
            $customer->update(['vmid' => $vmid]);

            ProvisionCustomerJob::dispatch($customer->id);

            return compact('customer', 'user', 'whmcsService', 'vmid');
        });

        return response()->json([
            'message' => 'Provisioning queued.',
            'customer_id' => $result['customer']->id,
            'vmid' => $result['vmid'],
            'panel_url' => config('hosting.panel.url'),
        ], 202);
    }

    public function suspend(Request $request, int $whmcsServiceId): JsonResponse
    {
        $service = $this->resolveService($whmcsServiceId);
        $customer = $service->customer;

        if ($customer?->vmid) {
            app(\App\Services\Hosting\Proxmox\ProxmoxClient::class)->stopVM((int) $customer->vmid);
        }

        $service->update(['status' => 'suspended']);
        $customer?->update(['status' => 'failed', 'provisioning_step' => 'suspended']);

        return response()->json(['message' => 'Service suspended.']);
    }

    public function unsuspend(Request $request, int $whmcsServiceId): JsonResponse
    {
        $service = $this->resolveService($whmcsServiceId);
        $customer = $service->customer;

        if ($customer?->vmid) {
            app(\App\Services\Hosting\Proxmox\ProxmoxClient::class)->startVM((int) $customer->vmid);
            $customer->update(['status' => 'active', 'provisioning_step' => 'completed']);
        }

        $service->update(['status' => 'active']);

        return response()->json(['message' => 'Service unsuspended.']);
    }

    public function terminate(Request $request, int $whmcsServiceId, DeprovisionService $deprovision): JsonResponse
    {
        $service = $this->resolveService($whmcsServiceId);
        $customer = $service->customer;

        if ($customer) {
            $deprovision->terminatePermanently($customer);
        }

        $service->update(['status' => 'terminated', 'customer_id' => null]);

        return response()->json([
            'message' => 'Service terminated. VMID will be released after configured retention.',
        ]);
    }

    public function status(int $whmcsServiceId): JsonResponse
    {
        $service = $this->resolveService($whmcsServiceId);
        $service->load('customer');

        return response()->json([
            'whmcs_service_id' => $service->whmcs_service_id,
            'status' => $service->status,
            'customer' => $service->customer ? [
                'id' => $service->customer->id,
                'name' => $service->customer->name,
                'vmid' => $service->customer->vmid,
                'status' => $service->customer->status,
                'provisioning_step' => $service->customer->provisioning_step,
                'ip_address' => $service->customer->ip_address,
                'domain' => $service->customer->domain,
            ] : null,
        ]);
    }

    private function resolveService(int $whmcsServiceId): WhmcsService
    {
        return WhmcsService::query()
            ->where('whmcs_service_id', $whmcsServiceId)
            ->firstOrFail();
    }
}