<?php

namespace Pterodactyl\Http\Controllers\Api\Remote\Servers;

use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Pterodactyl\Models\Server;
use Pterodactyl\Models\AuditLog;
use Illuminate\Http\JsonResponse;
use Illuminate\Database\Query\Builder;
use Illuminate\Database\Query\JoinClause;
use Pterodactyl\Http\Controllers\Controller;
use Pterodactyl\Services\Eggs\EggConfigurationService;
use Pterodactyl\Repositories\Eloquent\ServerRepository;
use Pterodactyl\Http\Resources\Wings\ServerConfigurationCollection;
use Pterodactyl\Services\Servers\ServerConfigurationStructureService;

class ServerDetailsController extends Controller
{
    private ServerRepository $repository;
    private ServerConfigurationStructureService $configurationStructureService;
    private EggConfigurationService $eggConfigurationService;

    /**
     * ServerDetailsController constructor.
     */
    public function __construct(
        ServerRepository $repository,
        ServerConfigurationStructureService $configurationStructureService,
        EggConfigurationService $eggConfigurationService
    ) {
        $this->repository = $repository;
        $this->configurationStructureService = $configurationStructureService;
        $this->eggConfigurationService = $eggConfigurationService;
    }

    /**
     * Returns details about the server that allows Wings to self-recover and ensure
     * that the state of the server matches the Panel at all times.
     *
     * @throws \Pterodactyl\Exceptions\Repository\RecordNotFoundException
     */
    public function __invoke(Request $request, string $uuid): JsonResponse
    {
        $server = $this->repository->getByUuid($uuid);

        return new JsonResponse([
            'settings' => $this->configurationStructureService->handle($server),
            'process_configuration' => $this->eggConfigurationService->handle($server),
        ]);
    }

    /**
     * Lists all servers with their configurations that are assigned to the requesting node.
     */
    public function list(Request $request): ServerConfigurationCollection
    {
        /** @var \Pterodactyl\Models\Node $node */
        $node = $request->attributes->get('node');

        // Avoid run-away N+1 SQL queries by pre-loading the relationships that are used
        // within each of the services called below.
        $servers = Server::query()->with('allocations', 'egg', 'mounts', 'variables', 'location')
            ->where('node_id', $node->id)
            // If you don't cast this to a string you'll end up with a stringified per_page returned in
            // the metadata, and then Wings will panic crash as a result.
            ->paginate((int) $request->input('per_page', 50));

        return new ServerConfigurationCollection($servers);
    }

    /**
     * Resets the state of all servers on the node to be normal. This is triggered
     * when Wings restarts and is useful for ensuring that any servers on the node
     * do not get incorrectly stuck in installing/restoring from backup states since
     * a Wings reboot would completely stop those processes.
     *
     * @throws \Throwable
     */
    public function resetState(Request $request): Response
    {
        $node = $request->attributes->get('node');

        // Get all of the servers that are currently marked as restoring from a backup
        // on this node that do not have a failed backup tracked in the audit logs table
        // as well.
        //
        // For each of those servers we'll track a new audit log entry to mark them as
        // failed and then update them all to be in a valid state.
        /** @var \Pterodactyl\Models\Server[] $servers */
        $servers = Server::query()
            ->select('servers.*')
            ->selectRaw('started.metadata->>"$.backup_uuid" as backup_uuid')
            ->leftJoinSub(function (Builder $builder) {
                $builder->select('*')->from('audit_logs')
                    ->where('action', AuditLog::SERVER__BACKUP_RESTORE_STARTED)
                    ->orderByDesc('created_at')
                    ->limit(1);
            }, 'started', 'started.server_id', '=', 'servers.id')
            ->leftJoin('audit_logs as completed', function (JoinClause $clause) {
                $clause->whereColumn('completed.created_at', '>', 'started.created_at')
                    ->whereIn('completed.action', [
                        AuditLog::SERVER__BACKUP_RESTORE_COMPLETED,
                        AuditLog::SERVER__BACKUP_RESTORE_FAILED,
                    ]);
            })
            ->whereNotNull('started.id')
            ->whereNull('completed.id')
            ->where('servers.node_id', $node->id)
            ->where('servers.status', Server::STATUS_RESTORING_BACKUP)
            ->get();

        foreach ($servers as $server) {
            // Just create a new audit entry for this event and update the server state
            // so that power actions, file management, and backups can resume as normal.
            $server->audit(AuditLog::SERVER__BACKUP_RESTORE_FAILED, function (AuditLog $audit, Server $server) {
                $audit->is_system = true;
                $audit->metadata = ['backup_uuid' => $server->getAttribute('backup_uuid')];
                $server->update(['status' => null]);
            });
        }

        // Update any server marked as installing or restoring as being in a normal state
        // at this point in the process.
        Server::query()->where('node_id', $node->id)
            ->whereIn('status', [Server::STATUS_INSTALLING, Server::STATUS_RESTORING_BACKUP])
            ->update(['status' => null]);

        return new Response('', JsonResponse::HTTP_NO_CONTENT);
    }
}