<?php

/**
 * ShowConfigController.php
 *
 * -Description-
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 * @link       https://www.librenms.org
 *
 * @copyright  2020 Tony Murray
 * @author     Tony Murray <murraytony@gmail.com>
 */

namespace App\Http\Controllers\Device\Tabs;

use App\ConfigBackup\ConfigBackupManager;
use App\Facades\DeviceCache;
use App\Facades\LibrenmsConfig;
use App\Http\Controllers\Controller;
use App\Models\Device;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Gate;
use LibreNMS\Interfaces\UI\DeviceTab;
use Symfony\Component\Process\Process;

class ShowConfigController extends Controller implements DeviceTab
{
    private $rancidPath;
    private $rancidFile;

    public function __construct(
        private readonly ConfigBackupManager $configBackupManager,
    ) {
    }

    public function visible(Device $device): bool
    {
        if ($this->configBackupManager->handles($device)) {
            return false; // a modern config backup provider takes over the Config tab
        }

        if (Gate::allows('configBackupView', $device)) {
            return $this->oxidizedEnabled($device) || $this->getRancidConfigFile() !== false;
        }

        return false;
    }

    public function slug(): string
    {
        return 'showconfig';
    }

    public function icon(): string
    {
        return 'fa-align-justify';
    }

    public function name(): string
    {
        return __('Config');
    }

    public function data(Device $device, Request $request): array
    {
        return [
            'rancid_path' => $this->getRancidPath(),
            'rancid_file' => $this->getRancidConfigFile(),
        ];
    }

    private function oxidizedEnabled(Device $device)
    {
        return LibrenmsConfig::get('oxidized.enabled') === true
                && LibrenmsConfig::has('oxidized.url')
                && $device->getAttrib('override_Oxidized_disable') !== 'true'
                && ! in_array($device->type, LibrenmsConfig::get('oxidized.ignore_types', []))
                && ! in_array($device->os, LibrenmsConfig::get('oxidized.ignore_os', []));
    }

    private function getRancidPath()
    {
        if (is_null($this->rancidPath)) {
            $this->rancidFile = $this->findRancidConfigFile();
        }

        return $this->rancidPath;
    }

    private function getRancidConfigFile()
    {
        if (is_null($this->rancidFile)) {
            $this->rancidFile = $this->findRancidConfigFile();
        }

        return $this->rancidFile;
    }

    private function findRancidConfigFile()
    {
        if (LibrenmsConfig::has('rancid_configs') && ! is_array(LibrenmsConfig::get('rancid_configs'))) {
            LibrenmsConfig::set('rancid_configs', (array) LibrenmsConfig::get('rancid_configs', []));
        }

        if (LibrenmsConfig::has('rancid_configs.0')) {
            $device = DeviceCache::getPrimary();
            foreach (LibrenmsConfig::get('rancid_configs') as $configs) {
                if (LibrenmsConfig::get('rancid_repo_type') == 'git-bare') {
                    $topLevel = strpos($configs, '.git');
                    $configPath = '';
                    if ($topLevel === false) {
                        if (is_dir($configs . '.git')) {
                            $configs .= '.git';
                        } else {
                            return false;
                        }
                    } else {
                        $configPath = substr($configs, $topLevel + 5);
                        $configs = substr($configs, 0, $topLevel + 4);
                    }
                    if (strlen($configPath) > 0 && $configPath[strlen($configPath) - 1] != '/') {
                        $configPath .= '/';
                    }
                    $process = new Process(['git', 'ls-tree', '--name-only', '-r', 'HEAD'], $configs);
                    $process->run();
                    $config_files = explode(PHP_EOL, $process->getOutput());
                    if (count($config_files) > 0) {
                        $this->rancidPath = $configs;
                    }
                    if (in_array($configPath . $device['hostname'], $config_files)) {
                        return $configPath . $device['hostname'];
                    }
                    if (in_array($configPath . strtok($device['hostname'], '.'), $config_files)) {
                        return $configPath . strtok($device['hostname'], '.');
                    }
                    if (! empty(LibrenmsConfig::get('mydomain')) && in_array($configPath . $device['hostname'] . '.' . LibrenmsConfig::get('mydomain'), $config_files)) {
                        return $configPath . $device['hostname'] . '.' . LibrenmsConfig::get('mydomain');
                    }
                } else {
                    if ($configs[strlen($configs) - 1] != '/') {
                        $configs .= '/';
                    }

                    if (is_file($configs . $device['hostname'])) {
                        $this->rancidPath = $configs;

                        return $configs . $device['hostname'];
                    } elseif (is_file($configs . strtok($device['hostname'], '.'))) { // Strip domain
                        $this->rancidPath = $configs;

                        return $configs . strtok($device['hostname'], '.');
                    } else {
                        if (! empty(LibrenmsConfig::get('mydomain'))) { // Try with domain name if set
                            if (is_file($configs . $device['hostname'] . '.' . LibrenmsConfig::get('mydomain'))) {
                                $this->rancidPath = $configs;

                                return $configs . $device['hostname'] . '.' . LibrenmsConfig::get('mydomain');
                            }
                        }
                    }
                }
            }
        }

        return false;
    }
}
