// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.Core.Configuration;

public class SmtpSettings
{
    public const int DefaultSmtpPort = 25;
    public const string DefaultSenderDisplayName = "ONLYOFFICE Postman";
    public string Host { get; private set; }
    public int Port { get; private set; }
    public string SenderAddress { get; private set; }
    public string SenderDisplayName { get; private set; }
    public string CredentialsDomain { get; private set; }
    public string CredentialsUserName { get; private set; }
    public string CredentialsUserPassword { get; private set; }
    public bool EnableSSL { get; set; }
    public bool EnableAuth { get; set; }
    public bool IsDefaultSettings { get; internal set; }
    public static readonly SmtpSettings Empty = new SmtpSettings();

    private SmtpSettings() { }

    public SmtpSettings(string host, string senderAddress)
        : this(host, senderAddress, DefaultSenderDisplayName)
    {

    }

    public SmtpSettings(string host, string senderAddress, string senderDisplayName)
        : this(host, DefaultSmtpPort, senderAddress, senderDisplayName)
    {

    }

    public SmtpSettings(string host, int port, string senderAddress)
        : this(host, port, senderAddress, DefaultSenderDisplayName)
    {

    }

    public SmtpSettings(string host, int port, string senderAddress, string senderDisplayName)
    {
        if (string.IsNullOrEmpty(host))
        {
            throw new ArgumentException("Empty smtp host.", nameof(host));
        }
        if (string.IsNullOrEmpty(senderAddress))
        {
            throw new ArgumentException("Empty sender address.", nameof(senderAddress));
        }

        Host = host;
        Port = port;
        SenderAddress = senderAddress;
        SenderDisplayName = senderDisplayName ?? throw new ArgumentNullException(nameof(senderDisplayName));
    }

    public void SetCredentials(string userName, string password)
    {
        SetCredentials(userName, password, string.Empty);
    }

    public void SetCredentials(string userName, string password, string domain)
    {
        if (string.IsNullOrEmpty(userName))
        {
            throw new ArgumentException("Empty user name.", nameof(userName));
        }
        if (string.IsNullOrEmpty(password))
        {
            throw new ArgumentException("Empty password.", nameof(password));
        }

        CredentialsUserName = userName;
        CredentialsUserPassword = password;
        CredentialsDomain = domain;
    }

    public string Serialize()
    {
        return ToString();
    }

    public static SmtpSettings Deserialize(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            return Empty;
        }

        var props = value.Split(new[] { '#' }, StringSplitOptions.None);
        props = Array.ConvertAll(props, p => !string.IsNullOrEmpty(p) ? p : null);

        var host = HttpUtility.UrlDecode(props[3]);
        var port = !string.IsNullOrEmpty(props[4]) ? int.Parse(props[4]) : DefaultSmtpPort;
        var senderAddress = HttpUtility.UrlDecode(props[5]);
        var senderDisplayName = HttpUtility.UrlDecode(props[6]) ?? DefaultSenderDisplayName;

        var settings = new SmtpSettings(host, port, senderAddress, senderDisplayName)
        {
            EnableSSL = 7 < props.Length && !string.IsNullOrEmpty(props[7]) && Convert.ToBoolean(props[7])
        };

        var credentialsUserName = HttpUtility.UrlDecode(props[1]);
        var credentialsUserPassword = HttpUtility.UrlDecode(props[2]);
        var credentialsDomain = HttpUtility.UrlDecode(props[0]);
        if (!string.IsNullOrEmpty(credentialsUserName) && !string.IsNullOrEmpty(credentialsUserPassword))
        {
            settings.SetCredentials(credentialsUserName, credentialsUserPassword, credentialsDomain);
            settings.EnableAuth = true;
        }
        else
        {
            settings.EnableAuth = false;
        }

        return settings;
    }

    public override string ToString()
    {
        return string.Join("#",
                           HttpUtility.UrlEncode(CredentialsDomain),
                           HttpUtility.UrlEncode(CredentialsUserName),
                           HttpUtility.UrlEncode(CredentialsUserPassword),
                           HttpUtility.UrlEncode(Host),
                           Port.ToString(),
                           HttpUtility.UrlEncode(SenderAddress),
                           HttpUtility.UrlEncode(SenderDisplayName),
                           EnableSSL.ToString());
    }
}