<?php
/**
 * alert-transports.inc.php
 *
 * LibreNMS alert-transports.inc.php for processor
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @package    LibreNMS
 * @link       http://librenms.org
 * @copyright  2018 Vivia Nguyen-Tran
 * @author     Vivia Nguyen-Tran <vivia@ualberta.ca>
 */

use Illuminate\Container\Container;
use Illuminate\Filesystem\Filesystem;
use Illuminate\Translation\FileLoader;
use Illuminate\Translation\Translator;
use Illuminate\Validation\Factory;
use LibreNMS\Authentication\LegacyAuth;

header('Content-type: application/json');

if (!LegacyAuth::user()->hasGlobalAdmin()) {
    die(json_encode([
        'status' => 'error',
        'message' => 'You need to be admin'
    ]));
}

$status = 'ok';
$message = '';

$transport_id        = $vars['transport_id'];
$name                = $vars['name'];
$is_default          = (int)(isset($vars['is_default']) && $vars['is_default'] == 'on');
$transport_type      = $vars['transport-type'];

if (empty($name)) {
    $status = 'error';
    $message = 'No transport name provided';
} elseif (empty($transport_type)) {
    $status = 'error';
    $message = 'Missing transport information';
} else {
    $details = array(
        'transport_name' => $name,
        'is_default' => $is_default
    );

    if (is_numeric($transport_id) && $transport_id > 0) {
        // Update the fields -- json config field will be updated later
        dbUpdate($details, 'alert_transports', 'transport_id=?', [$transport_id]);
    } else {
        // Insert the new alert transport
        $newEntry = true;
        $transport_id = dbInsert($details, 'alert_transports');
    }

    if ($transport_id) {
        $class = 'LibreNMS\\Alert\\Transport\\'.ucfirst($transport_type);

        if (!method_exists($class, 'configTemplate')) {
            die(json_encode([
                'status' => 'error',
                'message' => 'This transport type is not yet supported'
            ]));
        }
        
        // Build config values
        $result = call_user_func_array($class.'::configTemplate', []);
        $loader = new FileLoader(new Filesystem, "$install_dir/resources/lang");
        $translator = new Translator($loader, 'en');
        $validation = new Factory($translator, new Container);
        $validator = $validation->make($vars, $result['validation']);
        if ($validator->fails()) {
            $errors = $validator->errors();
            foreach ($errors->all() as $error) {
                $message .= "$error<br>";
            }
            $status = 'error';
        } else {
            $transport_config = json_decode(dbFetchCell('SELECT transport_config FROM alert_transports WHERE transport_id=?', [$transport_id]), true);
            foreach ($result['config'] as $tmp_config) {
                if (isset($tmp_config['name']) && $tmp_config['type'] !== 'hidden') {
                    $transport_config[$tmp_config['name']] = $vars[$tmp_config['name']];
                }
            }
            //Update the json config field
            if ($transport_config) {
                $transport_config = json_encode($transport_config);
                $detail = [
                    'transport_type' => $transport_type,
                    'transport_config' => $transport_config
                ];
                $where = 'transport_id=?';

                dbUpdate($detail, 'alert_transports', $where, [$transport_id]);

                $status = 'ok';
                $message = 'Updated alert transports';
            } else {
                $status = 'error';
                $message = 'There was an issue with the transport config';
            }
        }
        if ($status == 'error' && $newEntry) {
            //If error, we will have to delete the new entry in alert_transports tbl
            $where = '`transport_id`=?';
            dbDelete('alert_transports', $where, [$transport_id]);
        }
    } else {
        $status = 'error';
        $message = 'Failed to update transport';
    }
}

die(json_encode([
    'status'       => $status,
    'message'      => $message
]));
