/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN 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.
 *
 * ProtonVPN 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 ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

namespace ProtonVPN.Crypto.Contracts;

public abstract class Key
{
    public byte[] Bytes { get; }
    public string Base64 { get; }
    public KeyAlgorithm Algorithm { get; }
    public string Pem { get; }

    protected Key(byte[] bytes, KeyAlgorithm algorithm)
        : this(bytes, Convert.ToBase64String(bytes), algorithm)
    {
    }

    protected Key(string base64, KeyAlgorithm algorithm)
        : this(Convert.FromBase64String(base64), base64, algorithm)
    {
    }

    private Key(byte[] bytes, string base64, KeyAlgorithm algorithm)
    {
        if (bytes == null || bytes.Length <= 0)
        {
            throw new ArgumentException($"The '{nameof(bytes)}' argument is empty.");
        }
        if (string.IsNullOrEmpty(base64))
        {
            throw new ArgumentException($"The '{nameof(base64)}' argument is empty.");
        }
        Bytes = bytes;
        Base64 = base64;
        Algorithm = algorithm;
        Pem = CreatePem();
    }

    protected abstract string CreatePem();
}