<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;

use Sabre\DAV\Server;
use Sabre\DAV\Auth\Plugin as AuthPlugin;
use Sabre\DAV\Browser\Plugin as BrowserPlugin;
use Sabre\CalDAV\Plugin as CalDAVPlugin;
use Sabre\CardDAV\Plugin as CardDAVPlugin;
use Sabre\CalDAV\Backend\PDO as CalDavPDO;
use Sabre\CardDAV\Backend\PDO as CardDavPDO;

use Symfony\Component\HttpFoundation\Response;

use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;

use App\Services\Dav\PrincipalBackend;
use App\Services\Dav\LaravelSabreAuthBackend;

class DavController extends Controller
{
    /**
     * Single-action controller: handles every WebDAV request.
     */
    public function __invoke(Request $laravelRequest): Response
    {
        //\Log::debug('DavController reached', ['path' => $larevelRequest->path()]);
        //\Log::debug('[DAV] raw headers', getallheaders());

        /**
         * sabre back-ends tied to laravel's current db connection
         */
        $pdo = DB::connection()->getPdo();

        $principalBackend = new PrincipalBackend();
        $calBackend       = new CalDavPDO($pdo);
        $cardBackend      = new CardDavPDO($pdo);

        /**
         * resource tree
         */
        $nodes = [
            new \Sabre\DAVACL\PrincipalCollection($principalBackend),
            new \Sabre\CalDAV\CalendarRoot($principalBackend, $calBackend),
            new \Sabre\CardDAV\AddressBookRoot($principalBackend, $cardBackend),
        ];

        /**
         * create the server
         */
        $server = new Server($nodes);
        $server->setBaseUri('/dav/');

        /**
         * add plugins (order matters!)
         */
        if ($existing = $server->getPlugin('auth')) {
            $server->removePlugin($existing);
        }
        $server->addPlugin(
            new AuthPlugin(new LaravelSabreAuthBackend(), 'KithkinDAV')
        );
        $server->addPlugin(new \Sabre\DAVACL\Plugin());
        //$server->addPlugin(new \Sabre\CalDAV\Plugin());
        //$server->addPlugin(new \Sabre\CardDAV\Plugin());
        //$server->addPlugin(new \Sabre\DAV\Browser\Plugin());

        /**
         * execute (sabre sends the response and exits)
         */
        // logging
        \Log::debug('[DAV] listener attached to', ['hash' => spl_object_hash($server)]);

        $server->on('beforeMethod', function ($req) {
            \Log::debug('[DAV] beforeMethod', [
                'verb'  => $req->getMethod(),
                'url'   => $req->getUrl(),
                'auth'  => $req->getHeader('Authorization'),
            ]);
        });

        $server->on('method:PROPFIND', function ($req) {
            \Log::debug('[DAV] method:PROPFIND', [
                'url'  => $req->getUrl(),
                'auth' => $req->getHeader('Authorization'),
            ]);
        });

        \Log::debug('[DAV] about to exec', ['hash' => spl_object_hash($server)]);

        ob_start();
        $server->exec();
        $body = ob_get_clean();
        $sabre = $server->httpResponse;
        return new Response($body, $sabre->getStatus(), $sabre->getHeaders());
    }
}