<?php

/**
 * OAuthKeys.php
 * Copyright (c) 2020 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

declare(strict_types=1);

namespace FireflyIII\Support\System;

use Artisan;
use Crypt;
use Laravel\Passport\Console\KeysCommand;

/**
 * Class OAuthKeys
 */
class OAuthKeys
{
    private const PRIVATE_KEY = 'oauth_private_key';
    private const PUBLIC_KEY  = 'oauth_public_key';

    /**
     *
     */
    public static function verifyKeysRoutine(): void
    {
        if (!self::keysInDatabase() && !self::hasKeyFiles()) {
            self::generateKeys();
            self::storeKeysInDB();

            return;
        }
        if (self::keysInDatabase() && !self::hasKeyFiles()) {
            self::restoreKeysFromDB();

            return;
        }
        if (!self::keysInDatabase() && self::hasKeyFiles()) {
            self::storeKeysInDB();
        }
    }

    /**
     * @return bool
     */
    public static function keysInDatabase(): bool
    {
        return app('fireflyconfig')->has(self::PRIVATE_KEY) && app('fireflyconfig')->has(self::PUBLIC_KEY);
    }

    /**
     * @return bool
     */
    public static function hasKeyFiles(): bool
    {
        $private = storage_path('oauth-private.key');
        $public  = storage_path('oauth-public.key');

        return file_exists($private) && file_exists($public);
    }

    /**
     *
     */
    public static function generateKeys(): void
    {
        Artisan::registerCommand(new KeysCommand());
        Artisan::call('passport:keys');
    }

    /**
     *
     */
    public static function storeKeysInDB(): void
    {
        $private = storage_path('oauth-private.key');
        $public  = storage_path('oauth-public.key');
        app('fireflyconfig')->set(self::PRIVATE_KEY, Crypt::encrypt(file_get_contents($private)));
        app('fireflyconfig')->set(self::PUBLIC_KEY, Crypt::encrypt(file_get_contents($public)));
    }

    /**
     *
     */
    public static function restoreKeysFromDB(): void
    {
        $privateContent = Crypt::decrypt(app('fireflyconfig')->get(self::PRIVATE_KEY)->data);
        $publicContent  = Crypt::decrypt(app('fireflyconfig')->get(self::PUBLIC_KEY)->data);
        $private        = storage_path('oauth-private.key');
        $public         = storage_path('oauth-public.key');
        file_put_contents($private, $privateContent);
        file_put_contents($public, $publicContent);
    }

}