namespace JD.Nas.Reporting.Console.Module
{
    using JD.Nas.Reporting.Console.Module.Constants;
    using JD.Nas.Reporting.Console.Module.Exception;
    using JD.Nas.Service;
    using JD.Nas.Service.Exception;
    using JD.Nas.Service.NasReportingDto;
    using Newtonsoft.Json;
    using Plume.Core.Logging;
    using Plume.Interfaces.CommandLines;
    using System;
    using System.IO;
    using System.IO.Compression;
    using System.Linq;
    using System.Net;
    using System.Net.Http;
    using System.Threading.Tasks;

    public class ReportingConsoleAction : CommandLineAction<ReportingConsoleOption>
    {
        private readonly INasReportingService _nasReportingService;
        private ILogger _logger;

        private readonly string _applicationLogPath;
        private string _archiveDirectoryPath;
        private string _reportDirectoryPath;
        private string _reportPath;
        private string _reportZipFilePath;
        private string _reportZipFileArchivePath;

        private NasReportConfiguration _nasReportConfiguration;
        private NasReport _nasReport;

        #region Constructor
        public ReportingConsoleAction(INasReportingService nasReportingService, string applicationLogPath)
        {
            _nasReportingService = nasReportingService ?? throw new ArgumentNullException(nameof(nasReportingService));
            _applicationLogPath = applicationLogPath;
        }
        #endregion
        
        protected override int Execute(ReportingConsoleOption option, ILogger logger)
        {
            if (logger == null)
            {
                return (int)ReportingConsoleExitCode.ExecuteLoggerError;
            }

            _logger = logger;

            try
            {
                if (option == null)
                {
                    throw new ReportingConsoleException(
                       ReportingConsoleExitCode.ExecuteOptionError,
                       string.Concat("Option undefined : ", nameof(option))
                    );
                }

                if (string.IsNullOrEmpty(option.ConfigurationFilePath))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.ConfigurationFilePathNeeded,
                        "If ApiUrlForConfig arguments is feeled also ConfigFilePath is needed !"
                    );
                }

                #region ConfigurationFilePath verifications part 1

                if (!Directory.Exists(Path.GetDirectoryName(option.ConfigurationFilePath)))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.ConfigurationFilePathNotExist,
                        string.Concat("Directory not exist : ", Path.GetDirectoryName(option.ConfigurationFilePath))
                    );
                }

                if (!AccessDirectory(Path.GetDirectoryName(option.ConfigurationFilePath)))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.ConfigurationFilePathAccessDenied,
                        string.Concat("Access denied to directory : ", Path.GetDirectoryName(option.ConfigurationFilePath))
                    );
                }

                #endregion

                if (!string.IsNullOrEmpty(option.ApiUrlForConfiguration))
                {
                    this.DownloadJsonFile(option.ApiUrlForConfiguration, option.ConfigurationFilePath);
                }

                #region ConfigurationFilePath verifications part 2

                if (!option.ConfigurationFilePath.EndsWith(ReportingConsoleConstants.JsonExtension))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.ConfigurationFileNotJson,
                        string.Concat("Configuration file is not a json file : ", option.ConfigurationFilePath)
                    );
                }

                #endregion

                // Set _nasReportConfiguration variable with the option.ConfigFilePath configuration file
                this._nasReportConfiguration = this.DeserializeJsonFile<NasReportConfiguration>(option.ConfigurationFilePath);

                #region NasReportConfiguration verifications Part 1

                if (_nasReportConfiguration == null)
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.ConfigurationFileEmpty,
                        "Configuration file is empty"
                    );
                }

                // OutputPath attribut
                if (string.IsNullOrEmpty(_nasReportConfiguration.OutputPath))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.OutputPathNeeded,
                        "OutputPath arguments is needed !"
                    );
                }

                if (!Directory.Exists(Path.GetDirectoryName(_nasReportConfiguration.OutputPath)))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.OutputPathNotExist,
                        string.Concat("Directory not exist : ", Path.GetDirectoryName(_nasReportConfiguration.OutputPath))
                    );
                }

                if (!AccessDirectory(Path.GetDirectoryName(_nasReportConfiguration.OutputPath)))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.OutputPathNoAccess,
                        string.Concat("Access denied to directory : ", Path.GetDirectoryName(_nasReportConfiguration.OutputPath))
                    );
                }

                // NasReportId attribut
                if (string.IsNullOrEmpty(_nasReportConfiguration.NasReportId))
                {
                    throw new ReportingConsoleException(
                       ReportingConsoleExitCode.ReportIdNeeded,
                       "ReportId is needed !"
                   );
                }

                #endregion

                this._archiveDirectoryPath = Path.Combine(this._nasReportConfiguration.OutputPath, ReportingConsoleConstants.ArchiveFile);
                this._reportDirectoryPath = Path.Combine(this._nasReportConfiguration.OutputPath, this._nasReportConfiguration.NasReportId);

                #region NasReportConfiguration api verifications
                if(!string.IsNullOrEmpty(this._nasReportConfiguration.ApiUrlForData) && string.IsNullOrEmpty(this._nasReportConfiguration.ApiUrlForError))
                {
                    throw new ReportingConsoleException(
                      ReportingConsoleExitCode.ExecuteOptionError,
                      string.Concat("If ApiUrlForData is fill also ApiUrlForError is needed : ", nameof(option))
                   );
                }

                if (this._nasReportConfiguration.IsDebugApi == true && !string.IsNullOrEmpty(this._nasReportConfiguration.ApiUrlForData) && !string.IsNullOrEmpty(this._nasReportConfiguration.ApiUrlForError))
                {
                    this.WriteLogWarn("Api debug enabled");
                    this.WriteLogWarn("Try to post the report exclusively");

                    this._reportZipFilePath = Path.Combine(this._nasReportConfiguration.OutputPath, string.Concat(this._nasReportConfiguration.NasReportId, ReportingConsoleConstants.ZipExtension));

                    if (!File.Exists(Path.Combine(this._nasReportConfiguration.OutputPath, string.Concat(this._nasReportConfiguration.NasReportId, ReportingConsoleConstants.ZipExtension))))
                    {
                        throw new ReportingConsoleException(
                            ReportingConsoleExitCode.ZipFileReportNotExist,
                            string.Concat("ZipFileReport not exist : ", this._reportZipFilePath)
                        );
                    }

                    this.PostZipFile(this._reportZipFilePath, this._nasReportConfiguration.ApiUrlForData);
                        
                    this.WriteLogInfo("Api debug finished !");

                    return (int)ReportingConsoleExitCode.Ok;
                }

                #endregion

                #region NasReportConfiguration verification Part 2

                string reportPath =
                    Path.Combine(
                            _reportDirectoryPath,
                            string.Concat(this._nasReportConfiguration.NasReportId, ReportingConsoleConstants.JsonExtension));

                // NasReportId already use
                if (Directory.Exists(
                        Path.Combine(
                            this._nasReportConfiguration.OutputPath, 
                            this._nasReportConfiguration.NasReportId))
                    && File.Exists(reportPath))
                {
                    throw new ReportingConsoleException(
                       ReportingConsoleExitCode.ReportIdAlreadyUsed,
                       string.Concat("Report already exists : ", reportPath)
                    );
                }

                // NasServerConfigurations
                if (this._nasReportConfiguration.NasServerConfigurations == null || this._nasReportConfiguration.NasServerConfigurations.Count == 0)
                {
                    throw new ReportingConsoleException(
                       ReportingConsoleExitCode.NasServerConfigurationEmpty,
                       string.Concat("No server configuration detected", reportPath)
                    );
                }

                #endregion

                #region Reporting

                this.WriteLogInfo("Reporting started !");
                this.WriteLogInfo(string.Concat("They are ", this._nasReportConfiguration.NasServerConfigurations.Count, " to analyse"));

                // Analyse
                this.WriteLogInfo(string.Concat("The nas report analyse start"));
                this.AnalyseReport();
                this.WriteLogInfo(string.Concat("The nas report analyse is finish"));

                // Setup directory result
                this.CompleteReportDirectory();

                // Zip directory result
                this.ZipReport();

                #endregion

                // ApiUrl
                if (!string.IsNullOrEmpty(_nasReportConfiguration.ApiUrlForData))
                {
                    // Send data
                    this.PostZipFile(this._reportZipFilePath, this._nasReportConfiguration.ApiUrlForData);

                    // Archive the zip
                    this.ArchiveReport();
                }

                this.WriteLogInfo(string.Concat("Work finished !"));

                return (int)ReportingConsoleExitCode.Ok;
            }
            catch (ReportingConsoleException ex)
            {
                this.WriteLogError(ex);
                this.PostZipFileError();
                return ex.GetExitCodeInt();
            }
            catch (System.Exception ex)
            {
                ReportingConsoleException exception = new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedError,
                    ex
                );
                this.WriteLogError(exception);
                this.PostZipFileError();
                return exception.GetExitCodeInt();
            }
        }

        #region Private

        /// <summary>
        /// Zip, post and archive the report error data
        /// </summary>
        private void PostZipFileError()
        {
            // Create the report directory, if not exist
            this.CreateReportDirectory();
            // Complete it with logs and other
            this.CompleteReportDirectory();
            // Zip it
            this.ZipReport();
            // Send the zip error
            this.PostZipFile(this._reportZipFilePath, this._nasReportConfiguration.ApiUrlForError);
            this.WriteLogInfo(string.Concat("The zip error has been send"));
            // Archive
            this.ArchiveReport();
        }

        /// <summary>
        /// Analyse report with current report configuration
        /// </summary>
        private void AnalyseReport()
        {
            this.CreateReportDirectory();

            foreach (NasServerConfiguration nasServerConfiguration in this._nasReportConfiguration.NasServerConfigurations)
            {
                if (string.IsNullOrEmpty(nasServerConfiguration.NasServerConfigurationId))
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.NasServerConfigurationIdNeeded
                    );
                }
                else
                {
                    try
                    {
                        AnalyseServer(this._reportPath, nasServerConfiguration);
                    }
                    catch (NasReportingServiceException ex)
                    {
                        this.WriteLogError(ex);
                    }
                    catch (ReportingConsoleException ex)
                    {
                        this.WriteLogError(ex);
                    }
                }
            }

            // Save the date of end
            this._nasReport.DateStop = DateTime.UtcNow;
        }

        /// <summary>
        /// Alanyse one nas server
        /// </summary>
        /// <param name="outputPath"></param>
        /// <param name="nasServerConfiguration"></param>
        private void AnalyseServer(string outputPath, NasServerConfiguration nasServerConfiguration)
        {
            // Start sniffing
            NasServerAnalyse nasServerAnalyse = this._nasReportingService.AnalyseNasServer(this._nasReport, nasServerConfiguration);

            if (nasServerAnalyse != null)
            {
                // Order
                nasServerAnalyse.Maps = nasServerAnalyse?.Maps.OrderBy(x => x.Name).ToList();

                nasServerAnalyse.DateStop = DateTime.UtcNow;

                // Save analyse file
                string filePath = Path.Combine(outputPath, nasServerConfiguration.FileAnalyseName);
                SaveFileAsJson(
                    filePath,
                    nasServerAnalyse,
                    (nasServerConfiguration.IsOutputFormatIndented ?? this._nasReportConfiguration.IsOutputFormatIndented ?? false)
                );

                this._nasReport.Servers.Add(filePath);
                    
                this.WriteLogInfo(string.Concat($"Nas server analyse finished of : ", nasServerConfiguration.Folder, " || ", DateTime.Now));
            }
            else
            {
                this.WriteLogWarn(string.Concat($"Nas server analyse of : ", nasServerConfiguration.Folder, " is empty || ", DateTime.Now));
            }
        }

        /// <summary>
        /// Post zip file
        /// </summary>
        /// <param name="zipPath"></param>
        /// <param name="url"></param>
        private void PostZipFile(string zipPath, string url)
        {
            try
            {
                HttpResponseMessage message;
                using (HttpClient client = new HttpClient())
                using (MultipartFormDataContent formData = new MultipartFormDataContent())
                {
                    message = this.PostZipFileTask(client, formData, zipPath, url).GetAwaiter().GetResult();
                }

                if (message == null)
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.PostZipFileError,
                        string.Concat("No response of http post : " + url)
                    );
                }
                else if (!message.IsSuccessStatusCode)
                {
                    throw new ReportingConsoleException(
                        ReportingConsoleExitCode.PostZipFileError,
                        string.Concat("The server return ", message.StatusCode.ToString(), " of http post of ", url)
                    );
                }
                else
                {
                    this.WriteLogInfo("PostZipFileReport() success !");
                }
            }
            catch (ReportingConsoleException ex)
            {
                throw ex;
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorPostZipFile,
                    ex
                );
            }
        }

        /// <summary>
        /// Post zip file (task)
        /// </summary>
        /// <param name="client"></param>
        /// <param name="formData"></param>
        /// <param name="zipPath"></param>
        /// <param name="url"></param>
        /// <returns></returns>
        private async Task<HttpResponseMessage> PostZipFileTask(HttpClient client, MultipartFormDataContent formData, string zipPath, string url)
        {
            try
            {
                byte[] byteArray = File.ReadAllBytes(zipPath);

                formData.Add(new ByteArrayContent(byteArray, 0, byteArray.Length), Path.GetFileNameWithoutExtension(zipPath), Path.GetFileName(zipPath));

                return await client.PostAsync(url, formData);
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorPostZipFileTask,
                    ex
                );
            }
        }

        /// <summary>
        /// Crete the report and his directory
        /// </summary>
        private void CreateReportDirectory()
        {
            try
            {
                // Setup report if not exist
                if (_nasReport == null)
                {
                    this._nasReport = new NasReport(this._nasReportConfiguration);
                    this._reportPath = Path.Combine(this._nasReportConfiguration.OutputPath, this._nasReport.Id);
                }

                // Create report directory if not exist
                if (!Directory.Exists(this._reportPath))
                {
                    Directory.CreateDirectory(this._reportPath);
                }
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorCreateReportDirectory,
                    ex
                );
            }
        }

        /// <summary>
        /// Save log, config, report files in the report directory
        /// </summary>
        private void CompleteReportDirectory()
        {
            try
            {
                // Save the report and reportConfiguration files
                SaveFileAsJson(
                    Path.Combine(
                        this._reportDirectoryPath, 
                        ReportingConsoleConstants.reportFile),
                    this._nasReport,
                    (this._nasReportConfiguration.IsOutputFormatIndented ?? false)
                );

                SaveFileAsJson(
                    Path.Combine(
                        this._reportDirectoryPath, 
                        ReportingConsoleConstants.configurationFile),
                    this._nasReportConfiguration,
                    (this._nasReportConfiguration.IsOutputFormatIndented ?? false)
                );

                // Copy the log file
                File.Copy(
                    Path.Combine(
                        this._applicationLogPath, 
                        ReportingConsoleConstants.nasReportingLogsFile),
                    Path.Combine(
                        this._reportDirectoryPath,
                        ReportingConsoleConstants.logsFile), true);
            }
            catch (ReportingConsoleException ex)
            {
                throw ex;
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorCompleteReportDirectory,
                    ex
                );
            } 
        }

        /// <summary>
        /// Create the compress file of report
        /// </summary>
        private void ZipReport()
        {
            try
            {
                _reportZipFilePath = Path.Combine(
                    this._nasReportConfiguration.OutputPath, 
                    string.Concat(this._nasReportConfiguration.NasReportId, ReportingConsoleConstants.ZipExtension));

                // If zip already exist, destoy it to regenerate it
                if (File.Exists(this._reportZipFilePath))
                    File.Delete(this._reportZipFilePath);

                // Create zip from directory of report
                ZipFile.CreateFromDirectory(
                    this._reportDirectoryPath,
                    this._reportZipFilePath
                );
                
                // Destroy directory of current analyse
                Directory.Delete(this._reportDirectoryPath, true);
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorZipReport,
                    ex
                );
            }
        }

        /// <summary>
        /// Archive the zip file report
        /// </summary>
        private void ArchiveReport()
        {
            try
            {
                this._reportZipFileArchivePath = Path.Combine(this._archiveDirectoryPath, this._nasReportConfiguration.NasReportId + ReportingConsoleConstants.ZipExtension);

                //Create directory for archive
                if (!Directory.Exists(this._archiveDirectoryPath))
                    Directory.CreateDirectory(this._archiveDirectoryPath);

                // Copy the log file
                File.Move(this._reportZipFilePath, this._reportZipFileArchivePath);

                // Delete file
                File.Delete(this._reportZipFilePath);
            }
            catch(System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorArchiveReport,
                    ex
                );
            }
        }

        /// <summary>
        /// Save object as JsonFile 
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="obj"></param>
        /// <param name="formatIndented"></param>
        private void SaveFileAsJson(string filePath, object obj, bool formatIndented = false)
        {
            try
            {
                string json = JsonConvert.SerializeObject(obj, formatIndented ? Formatting.Indented : Formatting.None);
                if (filePath.EndsWith(ReportingConsoleConstants.JsonExtension))
                {
                    File.WriteAllText(filePath, json);
                }
                else
                {
                    File.WriteAllText(filePath + ReportingConsoleConstants.JsonExtension, json);
                }
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorSaveFileAsJson,
                    ex
                );
            }
        }

        /// <summary>
        /// Deserialization of the configuration file
        /// </summary>
        /// <param name="filePath"></param>
        public T DeserializeJsonFile<T>(string filePath)
        {
            try
            {
                if (filePath.EndsWith(ReportingConsoleConstants.JsonExtension))
                {
                    return JsonConvert.DeserializeObject<T>(File.ReadAllText(filePath));
                }
                else
                {
                    return JsonConvert.DeserializeObject<T>(File.ReadAllText(filePath + ReportingConsoleConstants.JsonExtension));
                }
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorDeserializeJsonFile,
                    ex
                );
            }
        }

        /// <summary>
        /// Download a file at the url adress and save it in the path
        /// </summary>
        /// <param name="url"></param>
        /// <param name="filePath"></param>
        public void DownloadJsonFile(string url, string filePath)
        {
            try
            {
                HttpWebRequest WebReq = (HttpWebRequest)WebRequest.Create(string.Format(url));

                WebReq.Method = "GET";

                HttpWebResponse WebResp = (HttpWebResponse)WebReq.GetResponse();

                using (Stream stream = WebResp.GetResponseStream())
                {
                    StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8);
                    if (filePath.EndsWith(ReportingConsoleConstants.JsonExtension))
                    {
                        File.WriteAllText(filePath, reader.ReadToEnd());
                    }
                    else
                    {
                        File.WriteAllText(filePath + ReportingConsoleConstants.JsonExtension, reader.ReadToEnd());
                    }
                }
            }
            catch (System.Exception ex)
            {
                throw new ReportingConsoleException(
                    ReportingConsoleExitCode.UnexpectedErrorDownloadJsonFile,
                    ex
                );
            }      
        }

        /// <summary>
        /// Try to get GetAccessControl of directory to detect if we have access
        /// </summary>
        /// <param name="path"></param>
        /// <returns></returns>
        private bool AccessDirectory(string path)
        {
            try
            {
                System.Security.AccessControl.DirectorySecurity ds = Directory.GetAccessControl(path);
                return true;
            }
            catch
            {
                return false;
            }
        }

        #region Logs
        private void WriteLogError(NasReportingServiceException exception, NasServerAnalyse nasServerAnalyse = null)
        {
            this._nasReport?.Logs.Add(exception.GetIdString());
            nasServerAnalyse?.Logs.Add(exception.GetIdString());

            this._logger.Error(exception.ToString());
        }

        private void WriteLogError(ReportingConsoleException exception)
        {
            this._nasReport?.Logs.Add(exception.GetIdString());

            this._logger.Error(exception.ToString());
        }

        private void WriteLogWarn(string message)
        {
            this._nasReport?.Logs.Add(message);
            this._logger.Warn(message);
        }

        private void WriteLogInfo(string message)
        {
            this._nasReport?.Logs.Add(message);
            this._logger.Info(message);
        }

        #endregion

        #endregion
    }
}