using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using JD.LocalizationExport.Service.API;
using JD.LocalizationExport.Service.Implementation.Exporters;
using JD.LocalizationExport.Service.Implementation.IntermediaryFile;
using JD.LocalizationExport.Service.Implementation.Secrets;
using JD.LocalizationExport.Service.Implementation.Serialization;
using JD.LocalizationExport.Service.Implementation.Server;
using JD.LocalizationExport.Service.Model;
using JD.LocalizationExport.Service.Model.Options;
using Newtonsoft.Json;
using Plume.Core.Logging;
using Plume.Interfaces.Services;

namespace JD.LocalizationExport.Service.Implementation
{
    public class LocalizationExportService : ILocalizationExportService
    {
        private const string URLToCallOnOnlineLocalizationUploadFormat = @"http://backoffice-prod.tools.just-dance.com/Tools/loc/{0}";

        private static readonly Dictionary<ServiceContentEnvironment, string> EnvironmentServerNames = new Dictionary<ServiceContentEnvironment, string>()
        {
            { ServiceContentEnvironment.Dev, "dev" },
            { ServiceContentEnvironment.Prod, "prod" },
        };

        private ILogger _logger;


        // The private part can seem useless, but only way to make the property readonly while initializing it outside of the constructor
        private Dictionary<ExportType, ExportConfig> _exportConfigs;
        public Dictionary<ExportType, ExportConfig> ExportConfigs => _exportConfigs;

        public ExportEventsWrapper ExportEvents { get; } = new ExportEventsWrapper();

        public string ConfigPath { get; } = @"Resources/ExportConfig.json";


        public void Dispose()
        {
            // Nothing to dispose
        }

        public void Initialize(IServiceContext serviceContext)
        {
            _logger = serviceContext.Logger ?? throw new ArgumentNullException(nameof(serviceContext.Logger));

            _logger.Info("Initializing export service...");

            string fileConfig = File.ReadAllText(ConfigPath);
            FullExportConfiguration config = JsonConvert.DeserializeObject<FullExportConfiguration>(fileConfig);

            _exportConfigs = config.ExportConfigs;

            _logger.Info("Export service initialized");
        }


        #region ILocalizationExportService implementation

        public async Task<bool> ExportConsoleLocalizationAsync(DataToExport dataToExport, ConsoleExportOptions exportOptions, string repositoryRoot, IProgress<Tuple<string, int>> progress)
        {
            bool hasExportSucceeded = true;

            try
            {
                string fullExportFolderPath = Path.GetFullPath(Path.Combine(repositoryRoot, ExportConfigs[ExportType.Console].ExportFolderPath));

                LocalizationExporter exporter = new ConsoleLocalizationExporter(fullExportFolderPath, repositoryRoot, _logger, ExportEvents);
                hasExportSucceeded &= await ExportLocalizationAsync(exporter, dataToExport, repositoryRoot, progress, null).ConfigureAwait(false);
            }
            catch (Exception e)
            {
                _logger.Error(e.Message);
                await Task.FromException(e);
            }

            return hasExportSucceeded;
        }

        public async Task<bool> ExportOnlineLocalizationAsync(DataToExport dataToExport, OnlineExportOptions exportOptions, string repositoryRoot, IProgress<Tuple<string, int>> progress)
        {
            bool hasExportSucceeded = true;
            bool isTestExport = false;
            string intermediaryFileAddressFormat = ExportConfigs[ExportType.Online].SaveFilePath;

            var outputPath = Path.Combine(Path.GetTempPath(), "localisation.js"); // TODO: return exported files from ExportAsync to get them in the onLocalisationExportSuccess callback

            try
            {
                LocalizationExporter exporter = new OnlineLocalizationExporter(Path.GetTempPath(), _logger, ExportEvents);
                bool uploadToDevelopmentServers = exportOptions.UploadToDevServers;
                bool uploadToProductionServers = exportOptions.UploadToProdServers;
                bool forceUpload = exportOptions.ForceUpload;

                List<ServiceContentEnvironment> serversToExportTo = new List<ServiceContentEnvironment>(Enum.GetNames(typeof(ServiceContentEnvironment)).Length);
                if (uploadToDevelopmentServers)
                {
                    serversToExportTo.Add(ServiceContentEnvironment.Dev);
                }
                if (uploadToProductionServers)
                {
                    // Ask if the user is certain to export to avoid accidental exports on prod
                    System.Windows.MessageBoxResult answer = System.Windows.MessageBox.Show($"Are you sure you want to export on prod? {Environment.NewLine}" +
                                                                                            $"{Environment.NewLine}" +
                                                                                            $"This will change the texts seen by current players.",
                                                                                            "Export on production server",
                                                                                            System.Windows.MessageBoxButton.OKCancel,
                                                                                            System.Windows.MessageBoxImage.Warning);
                    if (answer != System.Windows.MessageBoxResult.OK)
                    {
                        string exportCanceledMessage = "Online localisation export canceled";
                        System.Windows.MessageBox.Show(exportCanceledMessage,
                                                       "Export canceled",
                                                       System.Windows.MessageBoxButton.OK,
                                                       System.Windows.MessageBoxImage.Error);
                        throw new Exception(exportCanceledMessage);
                    }

                    serversToExportTo.Add(ServiceContentEnvironment.Prod);
                }

                if (serversToExportTo.Count == 0)
                {
                    _logger.Warn("No upload type selected: making a test export without uploading it");
                    isTestExport = true;
                    serversToExportTo.Add(ServiceContentEnvironment.Dev);
                }

                foreach (ServiceContentEnvironment serverType in serversToExportTo)
                {
                    // Updating intermediary file address
                    ExportConfigs[ExportType.Online].SaveFilePath = string.Format(intermediaryFileAddressFormat, EnvironmentServerNames[serverType]);

                    hasExportSucceeded &= await ExportLocalizationAsync(exporter, dataToExport, repositoryRoot, progress, async () =>
                    {
                        bool hasUploadSucceeded = true;

                        if (!isTestExport && (uploadToDevelopmentServers || uploadToProductionServers)) // Double-check here so that we can never export by mistake
                        {
                            void LogInfo(string message)
                            {
                                _logger.Info(message);
                            }

                            _logger.Info("Getting credentials to connect to online server");
                            var secretsManager = await SecretsManagement.GetSecretsManager(_logger);
                            var configuration = await secretsManager.GetOnlineConfiguration();
                            _logger.Info("Successfully retrieved credentials to connect to online server");

                            var client = new GameServerClient();
                            ServerName serverName = serverType == ServiceContentEnvironment.Prod ? ServerName.Prod : ServerName.Uat;
                            await client.InitializeAsync(serverName, LogInfo, configuration);

                            async Task OnLocalizationUploadAsync(ServiceContentEnvironment s)
                            {
                                string server = EnvironmentServerNames[s];
                                string urlToCallOnLocalizationUpload = string.Format(URLToCallOnOnlineLocalizationUploadFormat, server);

                                try
                                {
                                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlToCallOnLocalizationUpload);
                                    HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();
                                    if (response.StatusCode == HttpStatusCode.OK)
                                    {
                                        _logger.Info("Successfully updated localization history on GitLab");
                                    }
                                    else
                                    {
                                        _logger.Error($"Attempt to update localization history failed with status code {response.StatusCode}");
                                        hasUploadSucceeded = false;
                                    }
                                }
                                catch (Exception e)
                                {
                                    _logger.Error("Exception during request on localization upload, please contact a backoffice or tools developer");
                                    _logger.Error(e.Message);

                                    hasUploadSucceeded = false;
                                }
                            }

                            IProgress<double> onlineUploadProgress = new Progress<double>(d =>
                            {
                                int progressValue = (int)(100d * d);
                                progress.Report(Tuple.Create($"Online upload: {progressValue}%", progressValue));
                            });

                            // Upload
                            _logger.Info($"Uploading localization on UAT-{EnvironmentServerNames[serverType]}");
                            await client.UploadLocalizationAsync(outputPath,
                                                                 serverType,
                                                                 forceUpload,
                                                                 LogInfo,
                                                                 onlineUploadProgress,
                                                                 async () => await OnLocalizationUploadAsync(serverType).ConfigureAwait(false))
                                        .ConfigureAwait(false);
                        }

                        return hasUploadSucceeded;
                    }, isTestExport).ConfigureAwait(false);
                }
            }
            catch (Exception e)
            {
                _logger.Error(e.Message);
                await Task.FromException(e);
            }

            return hasExportSucceeded;
        }

        public async Task<bool> ExportMCALocalizationAsync(DataToExport dataToExport, MCAExportOptions exportOptions, string repositoryRoot, IProgress<Tuple<string, int>> progress)
        {
            bool hasExportSucceeded = true;

            try
            {
                string fullExportFolderPath = Path.GetFullPath(Path.Combine(repositoryRoot, ExportConfigs[ExportType.MCA].ExportFolderPath));

                LocalizationExporter exporter = new MCALocalizationExporter(fullExportFolderPath, _logger, ExportEvents);
                hasExportSucceeded &= await ExportLocalizationAsync(exporter, dataToExport, repositoryRoot, progress, null).ConfigureAwait(false);
            }
            catch (Exception e)
            {
                _logger.Error(e.Message);
                await Task.FromException(e);
            }

            return hasExportSucceeded;
        }

        #endregion

        private async Task<bool> ExportLocalizationAsync(LocalizationExporter exporter,
                                                         DataToExport dataToExport,
                                                         string repositoryRoot,
                                                         IProgress<Tuple<string, int>> progress,
                                                         Func<Task<bool>> onLocalisationExportSuccess,
                                                         bool isTestExport = false) // TODO: Would be better with a debug option for the export
        {
            bool hasExportSucceeded = true;

            if (dataToExport == null)
                throw new ArgumentNullException(nameof(dataToExport));
            if (progress == null)
                throw new ArgumentNullException(nameof(progress));

            try
            {
                Line[] fullLinesToExport = { };
                Language[] fullLanguagesToExport = { };
                Language[] minLanguagesToExport = dataToExport.LanguagesToExport.ToArray();

                ExportType currentExportType = exporter.ExportType;
                ExportConfig currentConfig = ExportConfigs[currentExportType];


                await exporter.ExportEvents.InvokeExportStartedAsync(currentExportType);

                string locIntermediaryFile;
                if (Uri.TryCreate(currentConfig.SaveFilePath, UriKind.Absolute, out Uri locIntermediaryFileUri))
                {
                    if (locIntermediaryFileUri.Scheme == Uri.UriSchemeHttp || locIntermediaryFileUri.Scheme == Uri.UriSchemeHttps)
                    {
                        locIntermediaryFile = Path.Combine(Path.GetTempPath(), $"{currentExportType}Save.json");
                        await exporter.ExportEvents.InvokeExportFileStartedAsync(currentExportType, locIntermediaryFile, locIntermediaryFileUri);
                    }
                    else
                    {
                        throw new UriFormatException($"The path '{currentConfig.SaveFilePath}' is not a relative file path or an URL. Fix it in the configuration {ConfigPath}.");
                    }
                }
                else
                {
                    locIntermediaryFile = Path.Combine(repositoryRoot, currentConfig.ExportFolderPath, currentConfig.SaveFilePath);
                    await exporter.ExportEvents.InvokeExportFileStartedAsync(currentExportType, locIntermediaryFile);
                }

                IIntermediaryFileManager intermediaryFileManager = new IntermediaryFileManager(locIntermediaryFile);
                if (File.Exists(locIntermediaryFile))
                {
                    fullLinesToExport = dataToExport.LinesToExport.ToArray();
                    fullLanguagesToExport = minLanguagesToExport;

                    _logger.Info("Loading previous export info...");

                    Tuple<Line[], Language[]> updatedExportData = await intermediaryFileManager.LoadFileAndMergeAsync(fullLinesToExport, fullLanguagesToExport, dataToExport.AllLanguages)
                                                                                               .ConfigureAwait(false);
                    fullLinesToExport = updatedExportData.Item1;
                    fullLanguagesToExport = updatedExportData.Item2;
                }
                else
                {
                    // Need to export all lines in all languages to get a starting point for the intermediary file
                    System.Windows.MessageBoxResult answer = System.Windows.MessageBox.Show($"The {currentExportType.ToString()} localisation save file is missing. {Environment.NewLine}" +
                                                                                            $"Expected file: {Path.GetFullPath(locIntermediaryFile)} {Environment.NewLine}" +
                                                                                            $"{Environment.NewLine}" +
                                                                                            $"Without it, impossible to export only some lines or some languages. {Environment.NewLine}" +
                                                                                            $"{Environment.NewLine}" +
                                                                                            $"Export all lines in all languages?",
                                                                                            "Export all lines",
                                                                                            System.Windows.MessageBoxButton.OKCancel,
                                                                                            System.Windows.MessageBoxImage.Question);
                    // TODO: Fix freeze just after this popup

                    if (answer == System.Windows.MessageBoxResult.OK)
                    {
                        Directory.CreateDirectory(Path.GetDirectoryName(locIntermediaryFile)); // Creating folder hierarchy if it doesn't exist

                        fullLinesToExport = dataToExport.AllLines.ToArray();
                        fullLanguagesToExport = dataToExport.AllLanguages.ToArray();
                    }
                    else
                    {
                        _logger.Error("No save file available, export aborted.");
                        hasExportSucceeded = false;
                    }
                }

                if (hasExportSucceeded)
                {
                    _logger.Info("Beginning export...");

                    await exporter.ExportAsync(fullLinesToExport, fullLanguagesToExport, minLanguagesToExport).ConfigureAwait(false);

                    if (onLocalisationExportSuccess != null)
                    {
                        hasExportSucceeded &= await onLocalisationExportSuccess().ConfigureAwait(false);
                    }

                    if (hasExportSucceeded)
                    {
                        _logger.Info("Saving export info...");

                        await intermediaryFileManager.SaveFileAsync(fullLinesToExport, fullLanguagesToExport).ConfigureAwait(false);

                        _logger.Info("Saved");

                        if (locIntermediaryFileUri != null)
                        {
                            // Avoid permanent modification of remote data just for testing purposes
                            if (!isTestExport)
                            {
                                await exporter.ExportEvents.InvokeExportFileEndedAsync(currentExportType, locIntermediaryFile, locIntermediaryFileUri);
                            }
                        }
                        else
                        {
                            await exporter.ExportEvents.InvokeExportFileEndedAsync(currentExportType, locIntermediaryFile);
                        }
                    }
                }

                await exporter.ExportEvents.InvokeExportEndedAsync(currentExportType);
            }
            catch (Exception e)
            {
                _logger.Error(e.Message);
                await Task.FromException(e);
            }

            return hasExportSucceeded;
        }
    }
}