<?php
/**
 * convert-template.inc.php
 *
 * Ajax method to convert templates from the old syntax to the blade syntax
 *
 * 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 Neil Lathwood
 * @copyright  2018 Tony Murray
 * @author     Tony Murray <murraytony@gmail.com>
 */

use LibreNMS\Authentication\Auth;

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

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

if (empty($vars['template'])) {
    die(json_encode([
        'status' => 'error',
        'message' => 'No template to convert',
    ]));
}

$new_body = '';
foreach (explode(PHP_EOL, $vars['template']) as $line) {
    $new_body .= convert_template($line) . PHP_EOL;
}
$new_title = convert_template($vars['title']);

function convert_template($line)
{
    if (str_contains($line, '{calc')) {
        return preg_replace(
            [
                '/{calc[ ]*([\w\d\s\%\.\(\)\*\/\-\+\/]+)}/',// Replaces {calc (something*100)}
                '/%([\w\d]+)\.([\w\d]+)/',// Replaces %something.anything
            ],
            [
                '@php echo \1; @endphp ',
                '$value[\'\2\']',
            ],
            $line
        );
    } else {
        $old1 = $line;
        $find = [
            '/{if %([\w=\s]+)}/',// Replaces {if %something == else}
            '/{else}/',// Replaces {else}
            '/{\/if}/',// Replaces {/if}
            '/{foreach %faults}/',// Replaces {foreach %faults}
            '/{foreach %contacts}/',// Replaces {foreach %contacts}
            '/{\/foreach}/',// Replaces {/foreach}
            '/{calc[ ]*([\w\d\s\%\.\(\)\*\/\-\+\/]+)}/',// Replaces {calc (something*100)}
            '/%value.string/',// Replaces %value.string
            '/%([\w\d]+)\.([\w\d]+)/',// Replaces %something.anything
            '/%([\w\d]+)/',// Replaces %anything
        ];
        $replace = [
            ' @if ($alert->\1) ',
            ' @else ',
            ' @endif ',
            ' @foreach ($alert->faults as $key => $value)',
            ' @foreach ($alert->contacts as $key => $value)',
            ' @endforeach ',
            ' @php echo \1; @endphp ',
            '{{ $value[\'string\'] }}',
            '{{ $\1[\'\2\'] }}',
            '{{ $alert->\1 }}',
        ];
        $old1 = preg_replace($find, $replace, $old1);

        // Revert some over-zealous changes:
        $find = [
            '/\$alert->key/',
            '/\$alert->value/',
        ];
        $replace = [
            '$key',
            '$value',
        ];
        return preg_replace($find, $replace, $old1);
    }
}

die(json_encode([
    'status'   => 'ok',
    'message'  => 'Template converted, review and save to update',
    'template' => $new_body,
    'title'    => $new_title,
]));
