<?php

namespace App\Http\Controllers\DAV\Backend\CalDAV;

use Sabre\DAV;
use App\Models\Contact\Task;
use App\Services\Task\DestroyTask;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Auth;
use Sabre\DAV\Server as SabreServer;
use App\Services\VCalendar\ExportTask;
use App\Services\VCalendar\ImportTask;
use Sabre\CalDAV\Plugin as CalDAVPlugin;
use Sabre\DAV\Sync\Plugin as DAVSyncPlugin;
use App\Http\Controllers\DAV\DAVACL\PrincipalBackend;

class CalDAVTasks extends AbstractCalDAVBackend
{
    /**
     * Returns the uri for this backend.
     *
     * @return string
     */
    public function backendUri()
    {
        return 'tasks';
    }

    public function getDescription()
    {
        $name = Auth::user()->name;
        $token = $this->getCurrentSyncToken();

        $des = [
            'principaluri'      => PrincipalBackend::getPrincipalUser(),
            '{DAV:}displayname' => $name,
            '{'.CalDAVPlugin::NS_CALDAV.'}calendar-description' => 'Tasks',
            '{'.CalDAVPlugin::NS_CALDAV.'}calendar-timezone' => Auth::user()->timezone,
        ];
        if ($token) {
            $token = DAVSyncPlugin::SYNCTOKEN_PREFIX.$token->id;
            $des += [
                '{DAV:}sync-token'  => $token,
                '{'.SabreServer::NS_SABREDAV.'}sync-token' => $token,
                '{'.CalDAVPlugin::NS_CALENDARSERVER.'}getctag' => $token,
            ];
        }

        return $des;
    }

    /**
     * Returns the collection of all tasks.
     *
     * @return \Illuminate\Support\Collection
     */
    public function getObjects()
    {
        return Auth::user()->account
                    ->tasks()
                    ->get();
    }

    /**
     * Returns the contact for the specific uri.
     *
     * @param string  $uri
     * @return mixed
     */
    public function getObjectUuid($uuid)
    {
        return Task::where([
            'account_id' => Auth::user()->account_id,
            'uuid' => $uuid,
        ])->first();
    }

    /**
     * Extension for Calendar objects.
     *
     * @var string
     */
    public function getExtension()
    {
        return '.ics';
    }

    /**
     * Datas for this task.
     *
     * @param mixed $task
     * @return array
     */
    public function prepareData($task)
    {
        if ($task instanceof Task) {
            try {
                $vcal = (new ExportTask())
                    ->execute([
                        'account_id' => Auth::user()->account_id,
                        'task_id' => $task->id,
                    ]);

                $calendardata = $vcal->serialize();

                return [
                    'id' => $task->id,
                    'uri' => $this->encodeUri($task),
                    'calendardata' => $calendardata,
                    'etag' => '"'.md5($calendardata).'"',
                    'lastmodified' => $task->updated_at->timestamp,
                ];
            } catch (\Exception $e) {
                Log::debug(__CLASS__.' prepareData: '.(string) $e);
            }
        }
    }

    /**
     * Updates an existing calendarobject, based on it's uri.
     *
     * The object uri is only the basename, or filename and not a full path.
     *
     * It is possible return an etag from this function, which will be used in
     * the response to this PUT request. Note that the ETag must be surrounded
     * by double-quotes.
     *
     * However, you should only really return this ETag if you don't mangle the
     * calendar-data. If the result of a subsequent GET to this object is not
     * the exact same as this request body, you should omit the ETag.
     *
     * @param string $objectUri
     * @param string $calendarData
     * @return string|null
     */
    public function updateOrCreateCalendarObject($objectUri, $calendarData)
    {
        $task_id = null;
        if ($objectUri) {
            $task = $this->getObject($objectUri);

            if ($task) {
                $task_id = $task->id;
            }
        }

        try {
            $result = (new ImportTask())
                ->execute([
                    'account_id' => Auth::user()->account_id,
                    'task_id' => $task_id,
                    'entry' => $calendarData,
                ]);
        } catch (\Exception $e) {
            Log::debug(__CLASS__.' updateOrCreateCalendarObject: '.(string) $e);
        }

        if (! array_has($result, 'error')) {
            $task = Task::where('account_id', Auth::user()->account_id)
                ->find($result['task_id']);

            $calendar = $this->prepareData($task);

            return $calendar['etag'];
        }
    }

    /**
     * Deletes an existing calendar object.
     *
     * The object uri is only the basename, or filename and not a full path.
     *
     * @param string $objectUri
     * @return void
     */
    public function deleteCalendarObject($objectUri)
    {
        $task = $this->getObject($objectUri);

        if ($task) {
            try {
                (new DestroyTask)
                    ->execute([
                        'account_id' => Auth::user()->account_id,
                        'task_id' => $task->id,
                    ]);
            } catch (\Exception $e) {
                Log::debug(__CLASS__.' deleteCalendarObject: '.(string) $e);
            }
        }
    }
}