// (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.Web.Core.Files
{
    /// <summary>
    /// Class service connector
    /// </summary>
    public static class DocumentService
    {
        /// <summary>
        /// Timeout to request conversion
        /// </summary>
        public static readonly int Timeout = 120000;
        //public static int Timeout = Convert.ToInt32(ConfigurationManagerExtension.AppSettings["files.docservice.timeout"] ?? "120000");

        /// <summary>
        /// Number of tries request conversion
        /// </summary>
        public static readonly int MaxTry = 3;

        /// <summary>
        /// Translation key to a supported form.
        /// </summary>
        /// <param name="expectedKey">Expected key</param>
        /// <returns>Supported key</returns>
        public static string GenerateRevisionId(string expectedKey)
        {
            expectedKey ??= "";
            const int maxLength = 128;
            using var sha256 = SHA256.Create();
            if (expectedKey.Length > maxLength) expectedKey = Convert.ToBase64String(sha256.ComputeHash(Encoding.UTF8.GetBytes(expectedKey)));
            var key = Regex.Replace(expectedKey, "[^0-9a-zA-Z_]", "_");
            return key.Substring(key.Length - Math.Min(key.Length, maxLength));
        }

        /// <summary>
        /// The method is to convert the file to the required format
        /// </summary>
        /// <param name="documentConverterUrl">Url to the service of conversion</param>
        /// <param name="documentUri">Uri for the document to convert</param>
        /// <param name="fromExtension">Document extension</param>
        /// <param name="toExtension">Extension to which to convert</param>
        /// <param name="documentRevisionId">Key for caching on service</param>
        /// <param name="password">Password</param>
        /// <param name="thumbnail">Thumbnail settings</param>
        /// <param name="isAsync">Perform conversions asynchronously</param>
        /// <param name="signatureSecret">Secret key to generate the token</param>
        /// <param name="convertedDocumentUri">Uri to the converted document</param>
        /// <returns>The percentage of completion of conversion</returns>
        /// <example>
        /// string convertedDocumentUri;
        /// GetConvertedUri("http://helpcenter.teamlab.com/content/GettingStarted.pdf", ".pdf", ".docx", "469971047", false, out convertedDocumentUri);
        /// </example>
        /// <exception>
        /// </exception>

        public static Task<(int ResultPercent, string ConvertedDocumentUri)> GetConvertedUriAsync(
            FileUtility fileUtility,
            string documentConverterUrl,
            string documentUri,
            string fromExtension,
            string toExtension,
            string documentRevisionId,
            string password,
            ThumbnailData thumbnail,
            SpreadsheetLayout spreadsheetLayout,
            bool isAsync,
            string signatureSecret,
           IHttpClientFactory clientFactory)
        {
            fromExtension = string.IsNullOrEmpty(fromExtension) ? Path.GetExtension(documentUri) : fromExtension;
            if (string.IsNullOrEmpty(fromExtension)) throw new ArgumentNullException(nameof(fromExtension), "Document's extension for conversion is not known");
            if (string.IsNullOrEmpty(toExtension)) throw new ArgumentNullException(nameof(toExtension), "Extension for conversion is not known");

            return InternalGetConvertedUriAsync(fileUtility, documentConverterUrl, documentUri, fromExtension, toExtension, documentRevisionId, password, thumbnail, spreadsheetLayout, isAsync, signatureSecret, clientFactory);
        }

        private static async Task<(int ResultPercent, string ConvertedDocumentUri)> InternalGetConvertedUriAsync(
           FileUtility fileUtility,
           string documentConverterUrl,
           string documentUri,
           string fromExtension,
           string toExtension,
           string documentRevisionId,
           string password,
           ThumbnailData thumbnail,
           SpreadsheetLayout spreadsheetLayout,
           bool isAsync,
           string signatureSecret,
           IHttpClientFactory clientFactory)
        {
            var title = Path.GetFileName(documentUri ?? "");
            title = string.IsNullOrEmpty(title) || title.Contains('?') ? Guid.NewGuid().ToString() : title;

            documentRevisionId = string.IsNullOrEmpty(documentRevisionId)
                                     ? documentUri
                                     : documentRevisionId;
            documentRevisionId = GenerateRevisionId(documentRevisionId);

            var request = new HttpRequestMessage();
            request.RequestUri = new Uri(documentConverterUrl);
            request.Method = HttpMethod.Post;
            request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse("application/json"));

            var httpClient = clientFactory.CreateClient();
            httpClient.Timeout = TimeSpan.FromMilliseconds(Timeout);

            var body = new ConvertionBody
            {
                Async = isAsync,
                FileType = fromExtension.Trim('.'),
                Key = documentRevisionId,
                OutputType = toExtension.Trim('.'),
                Title = title,
                Thumbnail = thumbnail,
                SpreadsheetLayout = spreadsheetLayout,
                Url = documentUri,
            };

            if (!string.IsNullOrEmpty(password))
            {
                body.Password = password;
            }

            if (!string.IsNullOrEmpty(signatureSecret))
            {
                var payload = new Dictionary<string, object>
                    {
                        { "payload", body }
                    };
                var token = JsonWebToken.Encode(payload, signatureSecret);
                //todo: remove old scheme
                request.Headers.Add(fileUtility.SignatureHeader, "Bearer " + token);

                token = JsonWebToken.Encode(body, signatureSecret);
                body.Token = token;
            }

            var bodyString = System.Text.Json.JsonSerializer.Serialize(body, new System.Text.Json.JsonSerializerOptions()
            {
                DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
            });

            request.Content = new StringContent(bodyString, Encoding.UTF8, "application/json");

            string dataResponse;
            HttpResponseMessage response = null;
            Stream responseStream = null;
            try
            {
                var countTry = 0;
                while (countTry < MaxTry)
                {
                    try
                    {
                        countTry++;
                        response = await httpClient.SendAsync(request);
                        responseStream = await response.Content.ReadAsStreamAsync();
                        break;
                    }
                    catch (HttpRequestException ex)
                    {
                        throw new HttpException((int)HttpStatusCode.BadRequest, ex.Message, ex);
                    }
                }
                if (countTry == MaxTry)
                {
                    throw new HttpRequestException("Timeout");
                }

                if (responseStream == null) throw new WebException("Could not get an answer");
                using var reader = new StreamReader(responseStream);
                dataResponse = await reader.ReadToEndAsync();
            }
            finally
            {
                if (responseStream != null)
                    responseStream.Dispose();
                if (response != null)
                    response.Dispose();
            }

            return GetResponseUri(dataResponse);
        }

        /// <summary>
        /// Request to Document Server with command
        /// </summary>
        /// <param name="documentTrackerUrl">Url to the command service</param>
        /// <param name="method">Name of method</param>
        /// <param name="documentRevisionId">Key for caching on service, whose used in editor</param>
        /// <param name="callbackUrl">Url to the callback handler</param>
        /// <param name="users">users id for drop</param>
        /// <param name="meta">file meta data for update</param>
        /// <param name="signatureSecret">Secret key to generate the token</param>
        /// <param name="version">server version</param>
        /// <returns>Response</returns>

        public static async Task<CommandResponse> CommandRequestAsync(FileUtility fileUtility,
            string documentTrackerUrl,
            CommandMethod method,
            string documentRevisionId,
            string callbackUrl,
            string[] users,
            MetaData meta,
            string signatureSecret,
            IHttpClientFactory clientFactory)
        {
            var request = new HttpRequestMessage();
            request.RequestUri = new Uri(documentTrackerUrl);
            request.Method = HttpMethod.Post;

            var httpClient = clientFactory.CreateClient();
            httpClient.Timeout = TimeSpan.FromMilliseconds(Timeout);

            var body = new CommandBody
            {
                Command = method,
                Key = documentRevisionId,
            };

            if (!string.IsNullOrEmpty(callbackUrl)) body.Callback = callbackUrl;
            if (users != null && users.Length > 0) body.Users = users;
            if (meta != null) body.Meta = meta;

            if (!string.IsNullOrEmpty(signatureSecret))
            {
                var payload = new Dictionary<string, object>
                {
                    { "payload", body }
                };

                var token = JsonWebToken.Encode(payload, signatureSecret);
                //todo: remove old scheme
                request.Headers.Add(fileUtility.SignatureHeader, "Bearer " + token);

                token = JsonWebToken.Encode(body, signatureSecret);
                body.Token = token;
            }

            var bodyString = System.Text.Json.JsonSerializer.Serialize(body, new System.Text.Json.JsonSerializerOptions()
            {
                DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
            });

            request.Content = new StringContent(bodyString, Encoding.UTF8, "application/json");

            string dataResponse;
            using (var response = await httpClient.SendAsync(request))
            using (var stream = await response.Content.ReadAsStreamAsync())
            {
                if (stream == null) throw new Exception("Response is null");

                using var reader = new StreamReader(stream);
                dataResponse = await reader.ReadToEndAsync();
            }


            try
            {
                var commandResponse = JsonConvert.DeserializeObject<CommandResponse>(dataResponse);
                return commandResponse;
            }
            catch (Exception ex)
            {
                return new CommandResponse
                {
                    Error = CommandResponse.ErrorTypes.ParseError,
                    ErrorString = ex.Message
                };
            }
        }

        public static Task<(string DocBuilderKey, Dictionary<string, string> Urls)> DocbuilderRequestAsync(
            FileUtility fileUtility,
            string docbuilderUrl,
            string requestKey,
            string scriptUrl,
            bool isAsync,
            string signatureSecret,
           IHttpClientFactory clientFactory)
        {
            ArgumentNullOrEmptyException.ThrowIfNullOrEmpty(docbuilderUrl);

            if (string.IsNullOrEmpty(requestKey) && string.IsNullOrEmpty(scriptUrl))
                throw new ArgumentException("requestKey or inputScript is empty");

            return InternalDocbuilderRequestAsync(fileUtility, docbuilderUrl, requestKey, scriptUrl, isAsync, signatureSecret, clientFactory);
        }

        private static async Task<(string DocBuilderKey, Dictionary<string, string> Urls)> InternalDocbuilderRequestAsync(
           FileUtility fileUtility,
           string docbuilderUrl,
           string requestKey,
           string scriptUrl,
           bool isAsync,
           string signatureSecret,
           IHttpClientFactory clientFactory)
        {
            var request = new HttpRequestMessage();
            request.RequestUri = new Uri(docbuilderUrl);
            request.Method = HttpMethod.Post;

            var httpClient = clientFactory.CreateClient();
            httpClient.Timeout = TimeSpan.FromMilliseconds(Timeout);

            var body = new BuilderBody
            {
                Async = isAsync,
                Key = requestKey,
                Url = scriptUrl
            };

            if (!string.IsNullOrEmpty(signatureSecret))
            {
                var payload = new Dictionary<string, object>
                    {
                        { "payload", body }
                    };

                var token = JsonWebToken.Encode(payload, signatureSecret);
                //todo: remove old scheme
                request.Headers.Add(fileUtility.SignatureHeader, "Bearer " + token);

                token = JsonWebToken.Encode(body, signatureSecret);
                body.Token = token;
            }

            var bodyString = System.Text.Json.JsonSerializer.Serialize(body, new System.Text.Json.JsonSerializerOptions()
            {
                DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
                Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
            });

            request.Content = new StringContent(bodyString, Encoding.UTF8, "application/json");

            string dataResponse = null;

            using (var response = await httpClient.SendAsync(request))
            using (var responseStream = await response.Content.ReadAsStreamAsync())
            {
                if (responseStream != null)
                {
                    using var reader = new StreamReader(responseStream);
                    dataResponse = await reader.ReadToEndAsync();
                }
            }

            if (string.IsNullOrEmpty(dataResponse)) throw new Exception("Invalid response");

            var responseFromService = JObject.Parse(dataResponse);
            if (responseFromService == null) throw new Exception("Invalid answer format");

            var errorElement = responseFromService.Value<string>("error");
            if (!string.IsNullOrEmpty(errorElement))
            {
                DocumentServiceException.ProcessResponseError(errorElement);
            }

            var isEnd = responseFromService.Value<bool>("end");

            Dictionary<string, string> urls = null;
            if (isEnd)
            {
                IDictionary<string, JToken> rates = (JObject)responseFromService["urls"];

                urls = rates.ToDictionary(pair => pair.Key, pair => pair.Value.ToString());
            }

            return (responseFromService.Value<string>("key"), urls);
        }

        public static Task<bool> HealthcheckRequestAsync(string healthcheckUrl, IHttpClientFactory clientFactory)
        {
            ArgumentNullOrEmptyException.ThrowIfNullOrEmpty(healthcheckUrl);

            return InternalHealthcheckRequestAsync(healthcheckUrl, clientFactory);
        }

        private static async Task<bool> InternalHealthcheckRequestAsync(string healthcheckUrl, IHttpClientFactory clientFactory)
        {
            var request = new HttpRequestMessage();
            request.RequestUri = new Uri(healthcheckUrl);

            var httpClient = clientFactory.CreateClient();
            httpClient.Timeout = TimeSpan.FromMilliseconds(Timeout);

            using var response = await httpClient.SendAsync(request);
            using var responseStream = await response.Content.ReadAsStreamAsync();
            if (responseStream == null)
            {
                throw new Exception("Empty response");
            }
            using var reader = new StreamReader(responseStream);
            var dataResponse = await reader.ReadToEndAsync();
            return dataResponse.Equals("true", StringComparison.InvariantCultureIgnoreCase);
        }

        public enum CommandMethod
        {
            Info,
            Drop,
            Saved, //not used
            Version,
            ForceSave, //not used
            Meta,
            License
        }

        [Serializable]
        [DebuggerDisplay("{Key}")]
        public class CommandResponse
        {
            [JsonPropertyName("error")]
            public ErrorTypes Error { get; set; }

            [JsonPropertyName("errorString")]
            public string ErrorString { get; set; }

            [JsonPropertyName("key")]
            public string Key { get; set; }

            [JsonPropertyName("license")]
            public License License { get; set; }

            [JsonPropertyName("server")]
            public ServerInfo Server { get; set; }

            [JsonPropertyName("quota")]
            public QuotaInfo Quota { get; set; }

            [JsonPropertyName("version")]
            public string Version { get; set; }

            public enum ErrorTypes
            {
                NoError = 0,
                DocumentIdError = 1,
                ParseError = 2,
                UnknownError = 3,
                NotModify = 4,
                UnknownCommand = 5,
                Token = 6,
                TokenExpire = 7,
            }

            [Serializable]
            [DebuggerDisplay("{BuildVersion}")]
            public class ServerInfo
            {
                [JsonPropertyName("buildDate")]
                public DateTime BuildDate { get; set; }

                [JsonPropertyName("buildNumber")]
                public int buildNumber { get; set; }

                [JsonPropertyName("buildVersion")]
                public string BuildVersion { get; set; }

                [JsonPropertyName("packageType")]
                public PackageTypes PackageType { get; set; }

                [JsonPropertyName("resultType")]
                public ResultTypes ResultType { get; set; }

                [JsonPropertyName("workersCount")]
                public int WorkersCount { get; set; }

                public enum PackageTypes
                {
                    OpenSource = 0,
                    IntegrationEdition = 1,
                    DeveloperEdition = 2
                }

                public enum ResultTypes
                {
                    Error = 1,
                    Expired = 2,
                    Success = 3,
                    UnknownUser = 4,
                    Connections = 5,
                    ExpiredTrial = 6,
                    SuccessLimit = 7,
                    UsersCount = 8,
                    ConnectionsOS = 9,
                    UsersCountOS = 10,
                    ExpiredLimited = 11
                }
            }

            [Serializable]
            [DataContract(Name = "Quota", Namespace = "")]
            public class QuotaInfo
            {
                [JsonPropertyName("users")]
                public List<User> Users { get; set; }

                [Serializable]
                [DebuggerDisplay("{UserId} ({Expire})")]
                public class User
                {
                    [JsonPropertyName("userid")]
                    public string UserId { get; set; }

                    [JsonPropertyName("expire")]
                    public DateTime Expire { get; set; }
                }
            }
        }

        [Serializable]
        [DebuggerDisplay("{Command} ({Key})")]
        private class CommandBody
        {
            [System.Text.Json.Serialization.JsonIgnore]
            public CommandMethod Command { get; set; }

            [JsonPropertyName("c")]
            public string C
            {
                get { return Command.ToString().ToLower(CultureInfo.InvariantCulture); }
            }

            [JsonPropertyName("callback")]
            public string Callback { get; set; }

            [JsonPropertyName("key")]
            public string Key { get; set; }

            [JsonPropertyName("meta")]
            public MetaData Meta { get; set; }

            [JsonPropertyName("users")]
            public string[] Users { get; set; }

            [JsonPropertyName("token")]
            public string Token { get; set; }

            //not used
            [JsonPropertyName("userdata")]
            public string UserData { get; set; }
        }

        [Serializable]
        [DebuggerDisplay("{Title}")]
        public class MetaData
        {
            [JsonPropertyName("title")]
            public string Title { get; set; }
        }

        [Serializable]
        [DebuggerDisplay("{Height}x{Width}")]
        public class ThumbnailData
        {
            [JsonPropertyName("aspect")]
            public int Aspect { get; set; }

            [JsonPropertyName("first")]
            public bool First { get; set; }

            [JsonPropertyName("height")]
            public int Height { get; set; }

            [JsonPropertyName("width")]
            public int Width { get; set; }
        }

        [Serializable]
        [DataContract(Name = "spreadsheetLayout", Namespace = "")]
        [DebuggerDisplay("SpreadsheetLayout {IgnorePrintArea} {Orientation} {FitToHeight} {FitToWidth} {Headings} {GridLines}")]
        public class SpreadsheetLayout
        {
            [JsonPropertyName("ignorePrintArea")]
            public bool IgnorePrintArea { get; set; }

            [JsonPropertyName("orientation")]
            public string Orientation { get; set; }

            [JsonPropertyName("fitToHeight")]
            public int FitToHeight { get; set; }

            [JsonPropertyName("fitToWidth")]
            public int FitToWidth { get; set; }

            [JsonPropertyName("headings")]
            public bool Headings { get; set; }

            [JsonPropertyName("gridLines")]
            public bool GridLines { get; set; }

            [JsonPropertyName("margins")]
            public LayoutMargins Margins { get; set; }

            [JsonPropertyName("pageSize")]
            public LayoutPageSize PageSize { get; set; }


            [Serializable]
            [DebuggerDisplay("Margins {Top} {Right} {Bottom} {Left}")]
            public class LayoutMargins
            {
                [JsonPropertyName("left")]
                public string Left { get; set; }

                [JsonPropertyName("right")]
                public string Right { get; set; }

                [JsonPropertyName("top")]
                public string Top { get; set; }

                [JsonPropertyName("bottom")]
                public string Bottom { get; set; }
            }

            [Serializable]
            [DebuggerDisplay("PageSize {Width} {Height}")]
            public class LayoutPageSize
            {
                [JsonPropertyName("height")]
                public string Height { get; set; }

                [JsonPropertyName("width")]
                public string Width { get; set; }
            }
        }

        [Serializable]
        [DebuggerDisplay("{Title} from {FileType} to {OutputType} ({Key})")]
        private class ConvertionBody
        {
            [JsonPropertyName("async")]
            public bool Async { get; set; }

            [JsonPropertyName("filetype")]
            public string FileType { get; set; }

            [JsonPropertyName("key")]
            public string Key { get; set; }

            [JsonPropertyName("outputtype")]
            public string OutputType { get; set; }

            [JsonPropertyName("password")]
            public string Password { get; set; }

            [JsonPropertyName("title")]
            public string Title { get; set; }

            [JsonPropertyName("thumbnail")]
            public ThumbnailData Thumbnail { get; set; }

            [JsonPropertyName("spreadsheetLayout")]
            public SpreadsheetLayout SpreadsheetLayout { get; set; }

            [JsonPropertyName("url")]
            public string Url { get; set; }

            [JsonPropertyName("token")]
            public string Token { get; set; }
        }

        [Serializable]
        [DebuggerDisplay("{Key}")]
        private class BuilderBody
        {
            [JsonPropertyName("async")]
            public bool Async { get; set; }

            [JsonPropertyName("key")]
            public string Key { get; set; }

            [JsonPropertyName("url")]
            public string Url { get; set; }

            [JsonPropertyName("token")]
            public string Token { get; set; }
        }

        [Serializable]
        public class FileLink
        {
            [JsonPropertyName("filetype")]
            public string FileType { get; set; }

            [JsonPropertyName("token")]
            public string Token { get; set; }

            [JsonPropertyName("url")]
            public string Url { get; set; }
        }

        [Serializable]
        public class DocumentServiceException : Exception
        {
            public ErrorCode Code { get; set; }

            public DocumentServiceException(ErrorCode errorCode, string message)
                : base(message)
            {
                Code = errorCode;
            }

            protected DocumentServiceException(SerializationInfo info, StreamingContext context) : base(info, context)
            {
                if (info != null)
                {
                    Code = (ErrorCode)info.GetValue("Code", typeof(ErrorCode));
                }
            }

            public override void GetObjectData(SerializationInfo info, StreamingContext context)
            {
                base.GetObjectData(info, context);

                if (info != null)
                {
                    info.AddValue("Code", Code);
                }
            }

            public static void ProcessResponseError(string errorCode)
            {
                if (!Enum.TryParse(errorCode, true, out ErrorCode code))
                {
                    code = ErrorCode.Unknown;
                }
                var errorMessage = code switch
                {
                    ErrorCode.VkeyUserCountExceed => "user count exceed",
                    ErrorCode.VkeyKeyExpire => "signature expire",
                    ErrorCode.VkeyEncrypt => "encrypt signature",
                    ErrorCode.UploadCountFiles => "count files",
                    ErrorCode.UploadExtension => "extension",
                    ErrorCode.UploadContentLength => "upload length",
                    ErrorCode.Vkey => "document signature",
                    ErrorCode.TaskQueue => "database",
                    ErrorCode.ConvertPassword => "password",
                    ErrorCode.ConvertDownload => "download",
                    ErrorCode.Convert => "convertation",
                    ErrorCode.ConvertTimeout => "convertation timeout",
                    ErrorCode.Unknown => "unknown error",
                    _ => "errorCode = " + errorCode,
                };
                throw new DocumentServiceException(code, errorMessage);
            }

            public enum ErrorCode
            {
                VkeyUserCountExceed = -22,
                VkeyKeyExpire = -21,
                VkeyEncrypt = -20,
                UploadCountFiles = -11,
                UploadExtension = -10,
                UploadContentLength = -9,
                Vkey = -8,
                TaskQueue = -6,
                ConvertPassword = -5,
                ConvertDownload = -4,
                Convert = -3,
                ConvertTimeout = -2,
                Unknown = -1
            }
        }

        /// <summary>
        /// Processing document received from the editing service
        /// </summary>
        /// <param name="jsonDocumentResponse">The resulting json from editing service</param>
        /// <param name="responseUri">Uri to the converted document</param>
        /// <returns>The percentage of completion of conversion</returns>
        private static (int ResultPercent, string responseuri) GetResponseUri(string jsonDocumentResponse)
        {
            if (string.IsNullOrEmpty(jsonDocumentResponse)) throw new ArgumentException("Invalid param", nameof(jsonDocumentResponse));

            var responseFromService = JObject.Parse(jsonDocumentResponse);
            if (responseFromService == null) throw new WebException("Invalid answer format");

            var errorElement = responseFromService.Value<string>("error");
            if (!string.IsNullOrEmpty(errorElement)) DocumentServiceException.ProcessResponseError(errorElement);

            var isEndConvert = responseFromService.Value<bool>("endConvert");

            int resultPercent;
            var responseUri = string.Empty;
            if (isEndConvert)
            {
                responseUri = responseFromService.Value<string>("fileUrl");
                resultPercent = 100;
            }
            else
            {
                resultPercent = responseFromService.Value<int>("percent");
                if (resultPercent >= 100) resultPercent = 99;
            }

            return (resultPercent, responseUri);
        }
    }
}