using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Serilog.Events;
using TINK.Model.Services.CopriApi.ServerUris;
using TINK.Services.BluetoothLock;
using TINK.Services.Geolocation;
using TINK.Settings;
using TINK.ViewModel.Map;
using TINK.ViewModel.Settings;

namespace TINK.Model.Settings
{
	public static class JsonSettingsDictionary
	{
		/// <summary>Title of the settings file.</summary>
		public const string SETTINGSFILETITLE = "Setting.Json";

		/// <summary> Key of the app version entry. </summary>
		public const string APPVERIONKEY = "AppVersion";

		/// <summary> Key of the app version entry. </summary>
		public const string SHOWWHATSNEWKEY = "ShowWhatsNew";

		/// <summary> Key of the app version entry. </summary>
		public const string EXPIRESAFTER = "ExpiresAfter";

		/// <summary> Key of the connect timeout. </summary>
		public const string CONNECTTIMEOUT = "ConnectTimeout";

		/// <summary> Key of the logging level entry. </summary>
		public const string MINLOGGINGLEVELKEY = "MinimumLoggingLevel";

		/// <summary> Key of the logging level entry. </summary>
		public const string ISREPORTLEVELVERBOSEKEY = "IsReportLevelVerbose";

		/// <summary> Key of the center to ... entry. </summary>
		public const string CENTERMAPTOCURRENTLOCATION = "CenterMapToCurrentLocation";

		/// <summary> Key of the center to ... entry. </summary>
		public const string STARTUPSETTINGS = "StartupSettings";

		public const string LOGTOEXTERNALFOLDER = "LogToExternalFolder";

		public const string THEMEKEY = "Theme";

		public const string ISSITECACHINGON = "IsSiteCachingOn";

		/// <summary> Gets a nullable value.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static T? GetNullableEntry<T>(
			string keyName,
			IDictionary<string, string> settingsJSON) where T : struct
		{
			if (!settingsJSON.TryGetValue(keyName, out string boolText)
				|| string.IsNullOrEmpty(boolText))
			{
				// File holds no entry.
				return null;
			}

			return JsonConvert.DeserializeObject<T>(boolText);
		}

		/// <summary> Gets a value to type class.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static T GetEntry<T>(
			string keyName,
			IDictionary<string, string> settingsJSON,
			Func<string, string> legacyValueConverter = null) where T : class
		{
			if (string.IsNullOrEmpty(keyName)
				|| settingsJSON == null
				|| !settingsJSON.TryGetValue(keyName, out string valueJSON)
				|| string.IsNullOrEmpty(valueJSON))
			{
				// File holds no entry.
				return null;
			}

			return JsonConvert.DeserializeObject<T>(legacyValueConverter != null
				? legacyValueConverter(valueJSON)
				: valueJSON);
		}

		/// <summary> Sets a nullable.</summary>
		/// <param name="entry">Entry to add to dictionary.</param>
		/// <param name="keyName">Key to use for value. </param>
		/// <param name="targetDictionary">Dictionary to set value to.</param>
		public static Dictionary<string, string> SetEntry<T>(T entry, string keyName, IDictionary<string, string> targetDictionary)
		{
			// Set value.
			if (targetDictionary == null)
				throw new Exception($"Writing entry value {keyName} to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ keyName, JsonConvert.SerializeObject(entry) }
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Sets the timeout to apply when connecting to bluetooth lock.</summary>
		/// <param name="targetDictionary">Dictionary to write information to.</param>
		/// <param name="connectTimeout">Connect timeout value.</param>
		public static Dictionary<string, string> SetConnectTimeout(
			this IDictionary<string, string> targetDictionary,
			TimeSpan connectTimeout)
		{
			if (targetDictionary == null)
				throw new Exception("Writing conntect timeout info failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ CONNECTTIMEOUT, JsonConvert.SerializeObject(connectTimeout, new JavaScriptDateTimeConverter()) }
			}).ToDictionary(key => key.Key, value => value.Value);
		}
		/// <summary> Sets the uri of the active copri host. </summary>
		/// <param name="settingsJSON">Dictionary holding parameters from JSON.</param>
		public static Dictionary<string, string> SetCopriHostUri(this IDictionary<string, string> targetDictionary, string p_strNextActiveUriText)
		{
			if (targetDictionary == null)
				throw new Exception("Writing copri host uri to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ typeof(CopriServerUriList).ToString(), JsonConvert.SerializeObject(p_strNextActiveUriText) },
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the timeout to apply when connecting to bluetooth lock.</summary>
		/// <param name="settingsJSON">Dictionary to get information from.</param>
		/// <returns>Connect timeout value.</returns>
		public static TimeSpan? GetConnectTimeout(Dictionary<string, string> settingsJSON)
		{
			if (!settingsJSON.TryGetValue(CONNECTTIMEOUT, out string connectTimeout)
				|| string.IsNullOrEmpty(connectTimeout))
			{
				// File holds no entry.
				return null;
			}

			return JsonConvert.DeserializeObject<TimeSpan>(connectTimeout, new JavaScriptDateTimeConverter());
		}
		/// <summary> Gets the logging level.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		/// <returns>Logging level</returns>
		public static Uri GetCopriHostUri(this IDictionary<string, string> settingsJSON)
		{
			// Get uri of corpi server.
			if (!settingsJSON.TryGetValue(typeof(CopriServerUriList).ToString(), out string uriText)
				|| string.IsNullOrEmpty(uriText))
			{
				// File holds no entry.
				return null;
			}


			return JsonConvert.DeserializeObject<Uri>(uriText);
		}

		/// <summary> Sets the version of the app. </summary>
		/// <param name="settingsJSON">Dictionary holding parameters from JSON.</param>
		public static Dictionary<string, string> SetAppVersion(
			this IDictionary<string, string> targetDictionary,
			Version appVersion)
		{
			if (targetDictionary == null)
				throw new Exception("Writing app version to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{APPVERIONKEY , JsonConvert.SerializeObject(appVersion, new VersionConverter()) },
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the app versions.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		/// <returns>Logging level</returns>
		public static Version GetAppVersion(this IDictionary<string, string> settingsJSON)
		{
			// Get the version of the app which wrote the settings file.
			if (!settingsJSON.TryGetValue(APPVERIONKEY, out string appVersion)
				|| string.IsNullOrEmpty(appVersion))
			{
				// File holds no entry.
				return null;
			}

			return appVersion.TrimStart().StartsWith("\"")
				? JsonConvert.DeserializeObject<Version>(appVersion, new VersionConverter())
				: Version.Parse(appVersion); // Format used up to version 3.0.0.115
		}


		/// <summary> Sets whether polling is on or off and the period if polling is on. </summary>
		/// <param name="settingsJSON">Dictionary to write entries to.</param>
		public static Dictionary<string, string> SetPollingParameters(
			this IDictionary<string, string> targetDictionary,
			PollingParameters pollingParameter)
		{
			if (targetDictionary == null)
				throw new Exception("Writing polling parameters to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ $"{typeof(PollingParameters).Name}_{typeof(TimeSpan).Name}", JsonConvert.SerializeObject(pollingParameter.Periode) },
				{ $"{typeof(PollingParameters).Name}_{typeof(bool).Name}", JsonConvert.SerializeObject(pollingParameter.IsActivated) },
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Get whether polling is on or off and the period if polling is on. </summary>
		/// <param name="settingsJSON">Dictionary holding parameters from JSON.</param>
		/// <returns>Polling parameters.</returns>
		public static PollingParameters GetPollingParameters(this IDictionary<string, string> settingsJSON)
		{
			// Check if dictionary contains entry for period.
			if (settingsJSON.TryGetValue($"{typeof(PollingParameters).Name}_{typeof(TimeSpan).Name}", out string period)
				&& settingsJSON.TryGetValue($"{typeof(PollingParameters).Name}_{typeof(bool).Name}", out string active)
				&& !string.IsNullOrEmpty(period)
				&& !string.IsNullOrEmpty(active))
			{
				return new PollingParameters(
					JsonConvert.DeserializeObject<TimeSpan>(period),
					JsonConvert.DeserializeObject<bool>(active));
			}

			return null;
		}

		/// <summary> Saves object to file. </summary>
		/// <param name="settingsList">Settings to save.</param>
		public static void Serialize(string settingsFileFolder, IDictionary<string, string> settingsList)
		{
			// Save settings to file.
			var l_oText = JsonConvert.SerializeObject(settingsList, Formatting.Indented);
			var l_oFolder = settingsFileFolder;
			System.IO.File.WriteAllText($"{l_oFolder}{System.IO.Path.DirectorySeparatorChar}{SETTINGSFILETITLE}", l_oText);
		}

		/// <summary> Gets TINK app settings form xml- file. </summary>
		/// <param name="settingsDirectory">Directory to read settings from.</param>
		/// <returns>Dictionary of settings.</returns>
		public static Dictionary<string, string> Deserialize(string settingsDirectory)
		{
			var fileName = $"{settingsDirectory}{System.IO.Path.DirectorySeparatorChar}{SETTINGSFILETITLE}";

			if (!System.IO.File.Exists(fileName))
			{
				// File is empty. Nothing to read.
				return new Dictionary<string, string>(); ;
			}

			var jsonFile = System.IO.File.ReadAllText(fileName);

			if (string.IsNullOrEmpty(jsonFile))
			{
				// File is empty. Nothing to read.
				return new Dictionary<string, string>();
			}

			// Load setting file.
			return JsonConvert.DeserializeObject<Dictionary<string, string>>(jsonFile);
		}

		/// <summary> Gets the logging level.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		/// <returns>Logging level.</returns>
		public static LogEventLevel? GetMinimumLoggingLevel(
			Dictionary<string, string> settingsJSON)
		{
			// Get logging level.
			if (!settingsJSON.TryGetValue(MINLOGGINGLEVELKEY, out string level)
				|| string.IsNullOrEmpty(level))
			{
				// File holds no entry.
				return null;
			}

			return (LogEventLevel)int.Parse(JsonConvert.DeserializeObject<string>(level));
		}

		/// <summary> Gets a value indicating whether report level is verbose or not.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static bool? GetIsReportLevelVerbose(Dictionary<string, string> settingsJSON) => GetNullableEntry<bool>(ISREPORTLEVELVERBOSEKEY, settingsJSON);

		/// <summary> Sets a value indicating whether  report level is verbose or not.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static Dictionary<string, string> SetIsReportLevelVerbose(this IDictionary<string, string> targetDictionary, bool isReportLevelVerbose)
			=> SetEntry(isReportLevelVerbose, ISREPORTLEVELVERBOSEKEY, targetDictionary);


		/// <summary> Sets the logging level.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		public static Dictionary<string, string> SetMinimumLoggingLevel(this IDictionary<string, string> targetDictionary, LogEventLevel level)
		{
			// Set logging level.
			if (targetDictionary == null)
				throw new Exception("Writing logging level to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ MINLOGGINGLEVELKEY, JsonConvert.SerializeObject((int)level) }
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the version of app when whats new was shown.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		/// <returns>Version of the app.</returns>
		public static Version GetWhatsNew(Dictionary<string, string> settingsJSON)
		{
			// Get logging level.
			if (!settingsJSON.TryGetValue(SHOWWHATSNEWKEY, out string whatsNewVersion)
				|| string.IsNullOrEmpty(whatsNewVersion))
			{
				// File holds no entry.
				return null;
			}

			return JsonConvert.DeserializeObject<Version>(whatsNewVersion, new VersionConverter());
		}

		/// <summary> Sets the version of app when whats new was shown.</summary>
		/// <param name="settingsJSON">Dictionary to get information from.</param>
		public static Dictionary<string, string> SetWhatsNew(this IDictionary<string, string> targetDictionary, Version appVersion)
		{
			// Set logging level.
			if (targetDictionary == null)
				throw new Exception("Writing WhatsNew info failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ SHOWWHATSNEWKEY, JsonConvert.SerializeObject(appVersion, new VersionConverter()) }
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the expires after value.</summary>
		/// <param name="settingsJSON">Dictionary to get expries after value from.</param>
		/// <returns>Expires after value.</returns>
		public static TimeSpan? GetExpiresAfter(Dictionary<string, string> settingsJSON)
		{
			if (!settingsJSON.TryGetValue(EXPIRESAFTER, out string expiresAfter)
				|| string.IsNullOrEmpty(expiresAfter))
			{
				// File holds no entry.
				return null;
			}

			return JsonConvert.DeserializeObject<TimeSpan>(expiresAfter, new JavaScriptDateTimeConverter());
		}

		/// <summary> Sets the the expiration time.</summary>
		/// <param name="settingsJSON">Dictionary to write information to.</param>
		public static Dictionary<string, string> SetExpiresAfter(this IDictionary<string, string> targetDictionary, TimeSpan expiresAfter)
		{
			if (targetDictionary == null)
				throw new Exception("Writing ExpiresAfter info failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ EXPIRESAFTER, JsonConvert.SerializeObject(expiresAfter, new JavaScriptDateTimeConverter()) }
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Sets the active lock service name. </summary>
		/// <param name="targetDictionary">Dictionary holding parameters from JSON.</param>
		public static Dictionary<string, string> SetActiveLockService(this IDictionary<string, string> targetDictionary, string activeLockService)
		{
			if (targetDictionary == null)
				throw new Exception("Writing active lock service name to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ typeof(ILocksService).Name, activeLockService },
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the active lock service name.</summary>
		/// <param name="settingsJSON">Dictionary to get logging level from.</param>
		/// <returns>Active lock service name.</returns>
		public static string GetActiveLockService(this IDictionary<string, string> settingsJSON)
		{
			// Get uri of corpi server.
			if (!settingsJSON.TryGetValue(typeof(ILocksService).Name, out string activeLockService)
				|| string.IsNullOrEmpty(activeLockService))
			{
				// File holds no entry.
				return null;
			}

			if (activeLockService == "TINK.Services.BluetoothLock.BLE.LockItByScanService")
			{
				// Name of this service was switched.
				return typeof(TINK.Services.BluetoothLock.BLE.LockItByScanServicePolling).FullName;
			}

			return activeLockService;
		}

		/// <summary> Sets the active Geolocation service name. </summary>
		/// <param name="targetDictionary">Dictionary holding parameters from JSON.</param>
		public static Dictionary<string, string> SetActiveGeolocationService(
			this IDictionary<string, string> targetDictionary,
			string activeGeolocationService)
		{
			if (targetDictionary == null)
				throw new Exception("Writing active geolocation service name to dictionary failed. Dictionary must not be null.");

			return targetDictionary.Union(new Dictionary<string, string>
			{
				{ typeof(IGeolocationService).Name, activeGeolocationService },
			}).ToDictionary(key => key.Key, value => value.Value);
		}

		/// <summary> Gets the active Geolocation service name.</summary>
		/// <param name="settingsJSON">Dictionary to get name of geolocation service from.</param>
		/// <returns>Active lock service name.</returns>
		public static string GetActiveGeolocationService(this IDictionary<string, string> settingsJSON)
		{
			// Get uri of corpi server.
			if (!settingsJSON.TryGetValue(typeof(IGeolocationService).Name, out string activeGeolocationService)
				|| string.IsNullOrEmpty(activeGeolocationService))
			{
				// File holds no entry.
				return null;
			}

			return activeGeolocationService;
		}

		/// <summary> Gets a value indicating whether to center the map to location or not.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static bool? GetCenterMapToCurrentLocation(Dictionary<string, string> settingsJSON) => GetNullableEntry<bool>(CENTERMAPTOCURRENTLOCATION, settingsJSON);

		/// <summary> Sets a value indicating whether to center the map to location or not.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static Dictionary<string, string> SetCenterMapToCurrentLocation(this IDictionary<string, string> targetDictionary, bool centerMapToCurrentLocation)
			=> SetEntry(centerMapToCurrentLocation, CENTERMAPTOCURRENTLOCATION, targetDictionary);

		/// <summary> Gets whether to store logging data on SD card or not.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static bool? GetLogToExternalFolder(Dictionary<string, string> settingsJSON) => GetNullableEntry<bool>(LOGTOEXTERNALFOLDER, settingsJSON);

		/// <summary> Gets full class name of active theme.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static string GetActiveTheme(Dictionary<string, string> settingsJSON)
			=> GetEntry<string>(THEMEKEY, settingsJSON, (value) =>
			{
				if (value == JsonConvert.SerializeObject(typeof(Themes.Konrad).FullName))
				{
					return JsonConvert.SerializeObject(TINK.Services.ThemeNS.ThemeSet.Konrad.ToString());
				}
				else if (value == JsonConvert.SerializeObject(typeof(Themes.LastenradBayern).FullName))
				{
					return JsonConvert.SerializeObject(TINK.Services.ThemeNS.ThemeSet.LastenradBayern.ToString());
				}
				else if (value == JsonConvert.SerializeObject(typeof(Themes.ShareeBike).FullName))
				{
					return JsonConvert.SerializeObject(TINK.Services.ThemeNS.ThemeSet.ShareeBike.ToString());
				}
				else
				{
					return value;
				}
			});

		/// <summary> Gets a value indicating whether site caching is on or off.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static bool? GetIsSiteCachingOn(Dictionary<string, string> settingsJSON) => GetNullableEntry<bool>(ISSITECACHINGON, settingsJSON);

		/// <summary> Sets whether to store logging data on SD card or not.</summary>
		/// <param name="settingsJSON">Dictionary to write value to.</param>
		public static Dictionary<string, string> SetLogToExternalFolder(this IDictionary<string, string> targetDictionary, bool useSdCard) => SetEntry(useSdCard, LOGTOEXTERNALFOLDER, targetDictionary);

		/// <summary> Sets active theme.</summary>
		/// <param name="targetDictionary">Dictionary to set value to.</param>
		public static Dictionary<string, string> SetActiveTheme(
			this IDictionary<string, string> targetDictionary,
			string theme)
			=> SetEntry(theme, THEMEKEY, targetDictionary);

		/// <summary> Sets whether site caching is on or off.</summary>
		/// <param name="settingsJSON">Dictionary to get value from.</param>
		public static Dictionary<string, string> SetIsSiteCachingOn(this IDictionary<string, string> targetDictionary, bool useSdCard) => SetEntry(useSdCard, ISSITECACHINGON, targetDictionary);

		/// <summary> Gets the map page filter. </summary>
		/// <param name="settings">Settings objet to load from.</param>
		public static IGroupFilterMapPage GetGroupFilterMapPage(this IDictionary<string, string> settings)
		{
			var keyName = "FilterCollection_MapPageFilter";
			if (settings == null || !settings.ContainsKey(keyName))
			{
				return null;
			}

			return new GroupFilterMapPage(JsonConvert.DeserializeObject<IDictionary<string, FilterState>>(settings[keyName]));
		}

		public static IDictionary<string, string> SetGroupFilterMapPage(
			this IDictionary<string, string> settings,
			IDictionary<string, FilterState> filterCollection)
		{
			if (settings == null
				|| filterCollection == null
				|| filterCollection.Count < 1)
			{
				return settings;
			}

			settings["FilterCollection_MapPageFilter"] = JsonConvert.SerializeObject(filterCollection);
			return settings;
		}

		/// <summary> Gets the settings filter. </summary>
		/// <param name="settings">Settings objet to load from.</param>
		public static IGroupFilterSettings GetGoupFilterSettings(this IDictionary<string, string> settings)
		{
			var keyName = "FilterCollection";
			if (settings == null || !settings.ContainsKey(keyName))
			{
				return null;
			}

			var legacyFilterCollection = new GroupFilterSettings(JsonConvert.DeserializeObject<IDictionary<string, FilterState>>(settings[keyName]));

			// Process legacy entries.
			var updatedFilterCollection = legacyFilterCollection.Where(x => x.Key.ToUpper() != "TINK.SMS" && x.Key.ToUpper() != "TINK.COPRI").ToDictionary(x => x.Key, x => x.Value);
			if (legacyFilterCollection.Count() <= updatedFilterCollection.Count())
			{
				// No legacy entries "INK.SMS" or "TINK.COPRI" found.
				return legacyFilterCollection;
			}

			var list = updatedFilterCollection.ToList();

			updatedFilterCollection.Add(
				"TINK",
				legacyFilterCollection.Any(x => x.Key.ToUpper() == "TINK.COPRI") ? legacyFilterCollection.FirstOrDefault(x => x.Key.ToUpper() == "TINK.COPRI").Value : FilterState.Off);

			return new GroupFilterSettings(updatedFilterCollection);
		}

		public static IDictionary<string, string> SetGroupFilterSettings(
			this IDictionary<string, string> settings,
			IDictionary<string, FilterState> filterCollection)
		{
			if (settings == null
				|| filterCollection == null
				|| filterCollection.Count < 1)
			{
				return settings;
			}

			settings["FilterCollection"] = JsonConvert.SerializeObject(filterCollection);
			return settings;
		}

		/// <summary>
		/// Gets the startup settings from dictionary.
		/// </summary>
		/// <param name="settings">Settings objet to load from.</param>
		public static StartupSettings GetStartupSettings(this IDictionary<string, string> settingsJSON)
			=> GetEntry<StartupSettings>(STARTUPSETTINGS, settingsJSON) ?? new StartupSettings();

		/// <summary> Sets the startup settings.</summary>
		/// <param name="settingsJSON">Dictionary to write value to.</param>
		public static IDictionary<string, string> SetStartupSettings(
			this IDictionary<string, string> settingsJSON,
			IStartupSettings startupSettings)
		{
			if (settingsJSON == null
				|| startupSettings == null)
			{
				return settingsJSON;
			}

			settingsJSON[STARTUPSETTINGS] = JsonConvert.SerializeObject(startupSettings);
			return settingsJSON;
		}
	}
}