// (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.MessagingSystem;

public class MessageSettings
{
    private const string UserAgentHeader = "User-Agent";
    private const string ForwardedHeader = "X-Forwarded-For";
    private const string HostHeader = "Host";
    private const string RefererHeader = "Referer";

    static MessageSettings()
    {
        Parser = Parser.GetDefault();
    }

    private static Parser Parser { get; set; }

    public static ClientInfo GetClientInfo(string uaHeader)
    {
        return Parser.Parse(uaHeader);
    }

    public static string GetUAHeader(HttpRequest request)
    {
        return request != null ? request.Headers[UserAgentHeader].FirstOrDefault() : null;
    }

    public static string GetUAHeader(IDictionary<string, StringValues> headers)
    {
        return headers.ContainsKey(UserAgentHeader) ? headers[UserAgentHeader].FirstOrDefault() : null;
    }

    public static string GetReferer(HttpRequest request)
    {
        return request != null ? request.Headers[RefererHeader].FirstOrDefault() : null;
    }

    public static string GetReferer(IDictionary<string, StringValues> headers)
    {
        return headers.ContainsKey(RefererHeader) ? headers[RefererHeader].FirstOrDefault() : null;
    }

    public static string GetIP(IDictionary<string, StringValues> headers)
    {
        var forwarded = headers.ContainsKey(ForwardedHeader) ? headers[ForwardedHeader].FirstOrDefault() : null;
        var host = headers.ContainsKey(HostHeader) ? headers[HostHeader].FirstOrDefault() : null;
        return forwarded ?? host;
    }

    public static string GetIP(HttpRequest request)
    {
        if (request != null)
        {
            var str = request.Headers[ForwardedHeader].FirstOrDefault() ?? request.GetUserHostAddress();
            if (str != null)
            {
                return str.Substring(0, str.IndexOf(':') != -1 ? str.IndexOf(':') : str.Length);
            }
        }
        return null;
    }

    public static void AddInfoMessage(EventMessage message, Dictionary<string, ClientInfo> dict = null)
    {
        ClientInfo clientInfo;
        if (dict != null)
        {
            if (!dict.TryGetValue(message.UAHeader, out clientInfo))
            {
                clientInfo = GetClientInfo(message.UAHeader);
                dict.Add(message.UAHeader, clientInfo);
            }
        }
        else
        {
            clientInfo = GetClientInfo(message.UAHeader);
        }
        if (clientInfo != null)
        {
            message.Browser = GetBrowser(clientInfo);
            message.Platform = GetPlatformAndDevice(clientInfo);
        }
    }

    public static string GetBrowser(ClientInfo clientInfo)
    {
        return clientInfo == null
                   ? null
                   : string.Format("{0} {1}", clientInfo.UA.Family, clientInfo.UA.Major).Trim();
    }

    public static string GetPlatformAndDevice(ClientInfo clientInfo)
    {
        return clientInfo == null
                   ? null
                   : string.Format("{0} {1} {2} {3}",
                   clientInfo.OS.Family,
                   clientInfo.OS.Major,
                   clientInfo.Device.Brand,
                   clientInfo.Device.Model)
                   .Trim();
    }
}