/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL 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 more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

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());
    }
}