/*
 *
 * (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.
 *
*/


using System;
using System.Diagnostics;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ASC.FederatedLogin
{
    [DebuggerDisplay("{AccessToken} (expired: {IsExpired})")]
    public class OAuth20Token
    {
        [JsonPropertyName("access_token")]
        public string AccessToken { get; set; }

        [JsonPropertyName("refresh_token")]
        public string RefreshToken { get; set; }

        [JsonPropertyName("expires_in")]
        [JsonNumberHandling(JsonNumberHandling.AllowReadingFromString)]
        public long ExpiresIn { get; set; }

        [JsonPropertyName("client_id")]
        public string ClientID { get; set; }

        [JsonPropertyName("client_secret")]
        public string ClientSecret { get; set; }

        [JsonPropertyName("redirect_uri")]
        public string RedirectUri { get; set; }

        [JsonPropertyName("timestamp")]
        public DateTime Timestamp { get; set; }

        [JsonIgnore]
        public string OriginJson { get; set; }

        public OAuth20Token()
        {
        }

        public OAuth20Token(OAuth20Token oAuth20Token)
        {
            Copy(oAuth20Token);
        }

        public OAuth20Token(string json)
        {
            Copy(FromJson(json));
        }

        private void Copy(OAuth20Token oAuth20Token)
        {
            if (oAuth20Token == null) return;

            AccessToken = oAuth20Token.AccessToken;
            RefreshToken = oAuth20Token.RefreshToken;
            ExpiresIn = oAuth20Token.ExpiresIn;
            ClientID = oAuth20Token.ClientID;
            ClientSecret = oAuth20Token.ClientSecret;
            RedirectUri = oAuth20Token.RedirectUri;
            Timestamp = oAuth20Token.Timestamp;
        }

        public bool IsExpired
        {
            get
            {
                if (!ExpiresIn.Equals(default))
                    return DateTime.UtcNow > Timestamp + TimeSpan.FromSeconds(ExpiresIn);
                return true;
            }
        }

        public static OAuth20Token FromJson(string json)
        {
            if (string.IsNullOrEmpty(json)) return null;
            try
            {
                var result = JsonSerializer.Deserialize<OAuth20Token>(json);

                if (result.Timestamp == default)
                {
                    result.Timestamp = DateTime.UtcNow;
                }

                return result;
            }
            catch (Exception)
            {
                return null;
            }
        }

        public string ToJson()
        {
            return JsonSerializer.Serialize(this);
        }

        public override string ToString()
        {
            return AccessToken;
        }
    }
}