using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using MonkeyCache.FileStore;
using TINK.Model.Bikes.BikeInfoNS.BluetoothLock;
using TINK.Model.Device;
using TINK.Model.Services.CopriApi;
using TINK.Repository.Request;
using TINK.Repository.Response;

namespace TINK.Repository
{
	public class CopriCallsMonkeyStore : ICopriCache
	{
		/// <summary> Prevents concurrent communictation. </summary>
		private object monkeyLock = new object();

		/// <summary> Builds requests.</summary>
		private IRequestBuilder requestBuilder;

		public const string BIKESAVAILABLE = @"{
              ""copri_version"" : ""4.1.0.0"",
              ""bikes"" : {},
              ""response_state"" : ""OK"",
              ""apiserver"" : ""https://app.tink-konstanz.de"",
              ""authcookie"" : """",
              ""response"" : ""bikes_available""
        }";

		/// <summary> Gets an empty response. </summary>
		/// <param name="copriVersion">Version of empty response.</param>
		/// <returns>Response.</returns>
		public static BikesAvailableResponse GetEmptyBikesAvailableResponse(string copriVersion)
			=> JsonConvertRethrow.DeserializeObject<BikesAvailableResponse>(BIKESAVAILABLE.Replace("4.1.0.0", copriVersion));

#if !COPRIVERSION41
		public const string BIKESOCCUPIED = @"{
              ""debuglevel"" : ""1"",
              ""user_id"" : """",
              ""response"" : ""user_bikes_occupied"",
              ""user_group"" : [ ""Konrad"", ""TINK"" ],
              ""authcookie"" : """",
              ""response_state"" : ""OK"",
              ""bikes_occupied"" : {},
              ""copri_version"" : ""4.1.0.0"",
              ""apiserver"" : ""https://app.tink-konstanz.de""
        }";
#endif

		/// <summary> Gets an empty response. </summary>
		/// <param name="copriVersion">Version of empty response.</param>
		/// <returns>Response.</returns>
		public static BikesReservedOccupiedResponse GetEmptyBikesReservedOccupiedResponse(string copriVersion)
			=> JsonConvertRethrow.DeserializeObject<BikesReservedOccupiedResponse>(BIKESOCCUPIED.Replace("4.1.0.0", copriVersion));

#if !COPRIVERSION41
		/// <summary> Version COPRI 4.0. or earlier</summary>
		public const string STATIONSALL = @"{
              ""apiserver"" : """",
              ""authcookie"" : """",
              ""response"" : ""stations_all"",
              ""copri_version"" : ""4.1.0.0"",
              ""stations"" : {},
              ""response_state"" : ""OK""
        }";
#else
        /// <summary> Version COPRI 4.1 or later. </summary>
        public const string STATIONSALL = @"{
              ""uri_primary"": """"
              ""uri_operator_array"": [ ]
              ""authcookie"" : """",
              ""response"" : ""stations_all"",
              ""copri_version"" : ""4.1.0.0"",
              ""stations"" : {},
              ""response_state"" : ""OK""
        }";
#endif

#if !COPRIVERSION41
		/// <summary> Version COPRI 4.0. or earlier</summary>
		public const string AUTHORIZATION = @"{
          ""user_group"" : [ """" ],
          ""response"" : ""authorization"",
          ""response_state"" : ""OK"",
          ""copri_version"" : ""4.1.0.0""
        }";
#else
        /// <summary> Version COPRI 4.0. or earlier</summary>
        public const string AUTHORIZATION = @"{
          ""user_group"" : [],
          ""response"" : ""authorization"",
          ""response_state"" : ""OK"",
          ""copri_version"" : ""4.1.0.0""
        }";
#endif

		/// <summary> Gets an empty response. </summary>
		/// <param name="copriVersion">Version of empty response.</param>
		/// <returns>Response.</returns>
		public static StationsAvailableResponse GetEmptyStationsAllResponse(string copriVersion)
			=> JsonConvertRethrow.DeserializeObject<StationsAvailableResponse>(STATIONSALL.Replace("4.1.0.0", copriVersion));

		/// <summary>
		/// Holds the seconds after which station and bikes info is considered to be invalid.
		/// Default value 1s.
		/// </summary>
		private TimeSpan ExpiresAfter { get; }

		/// <summary> Returns false because cached values are returned. </summary>
		public bool IsConnected => false;

		/// <summary> Gets the merchant id.</summary>
		public string MerchantId => requestBuilder.MerchantId;

		/// <summary> Gets the merchant id.</summary>
		public string SessionCookie => requestBuilder.SessionCookie;

		/// <summary> Initializes a instance of the copri monkey store object. </summary>
		/// <param name="p_strMerchantId">Id of the merchant.</param>
		/// <param name="uiIsoLangugageName">Two letter ISO language name.</param>
		/// <param name="sessionCookie">Session cookie if user is logged in, null otherwise.</param>
		public CopriCallsMonkeyStore(
			string merchantId,
			string uiIsoLangugageName,
			string sessionCookie = null,
			TimeSpan? expiresAfter = null)
		{
			ExpiresAfter = expiresAfter ?? TimeSpan.FromSeconds(1);

			requestBuilder = string.IsNullOrEmpty(sessionCookie)
				? new RequestBuilder(merchantId, uiIsoLangugageName) as IRequestBuilder
				: new RequestBuilderLoggedIn(merchantId, uiIsoLangugageName, sessionCookie);

			// Ensure that store holds valid entries.
			if (!Barrel.Current.Exists(requestBuilder.GetBikesAvailable()))
			{
				AddToCache(JsonConvertRethrow.DeserializeObject<BikesAvailableResponse>(BIKESAVAILABLE), new TimeSpan(0));
			}

			// Do not query bikes occupied if no user is logged in (leads to not implemented exception)
			if (!string.IsNullOrEmpty(sessionCookie) && !Barrel.Current.Exists(requestBuilder.GetBikesOccupied()))
			{
				AddToCache(JsonConvertRethrow.DeserializeObject<BikesReservedOccupiedResponse>(BIKESOCCUPIED), new TimeSpan(0));
			}

			if (!Barrel.Current.Exists(requestBuilder.GetStations()))
			{
				AddToCache(JsonConvertRethrow.DeserializeObject<StationsAvailableResponse>(STATIONSALL), new TimeSpan(0));
			}
		}

		public Task<ReservationBookingResponse> DoReserveAsync(string bikeId, Uri operatorUri)
		{
			throw new System.Exception("Reservierung im Offlinemodus nicht möglich!");
		}

		public Task<ReservationCancelReturnResponse> DoCancelReservationAsync(string bikeId, Uri operatorUri)
		{
			throw new System.Exception("Abbrechen einer Reservierung im Offlinemodus nicht möglich!");
		}

		public Task<ReservationBookingResponse> CalculateAuthKeysAsync(string bikeId, Uri operatorUri)
			=> throw new System.Exception("Schlosssuche im Offlinemodus nicht möglich!");

		public Task<ResponseBase> StartReturningBike(
			string bikeId,
			Uri operatorUri)
			=> throw new System.Exception("Benachrichtigung von start der Rückgabe im Offlinemodus nicht möglich!");

		public Task<ReservationBookingResponse> UpdateLockingStateAsync(
			string bikeId,
			lock_state state,
			Uri operatorUri,
			LocationDto geolocation,
			double batteryLevel,
			IVersionInfo versionInfo)
			=> throw new System.Exception("Aktualisierung des Schlossstatuses im Offlinemodus nicht möglich!");

		public Task<ReservationBookingResponse> DoBookAsync(string bikeId, Guid guid, double batteryPercentage, Uri operatorUri)
			=> throw new System.Exception("Buchung im Offlinemodus nicht möglich!");

		/// <summary> Books a bike and starts opening bike. </summary>
		/// <param name="bikeId">Id of the bike to book.</param>
		/// <param name="operatorUri">Holds the uri of the operator or null, in case of single operator setup.</param>
		/// <returns>Response on booking request.</returns>
		public Task<ReservationBookingResponse> BookAvailableAndStartOpeningAsync(
			string bikeId,
			Uri operatorUri)
			=> throw new System.Exception("Buchung von verfügbarem Rad mit Start von Schlossöffnen ist im Offlinemodus nicht möglich!");

		/// <summary> Books a bike and starts opening bike. </summary>
		/// <param name="bikeId">Id of the bike to book.</param>
		/// <param name="operatorUri">Holds the uri of the operator or null, in case of single operator setup.</param>
		/// <returns>Response on booking request.</returns>
		public Task<ReservationBookingResponse> BookReservedAndStartOpeningAsync(
			string bikeId,
			Uri operatorUri)
			=> throw new System.Exception("Buchung von reserviertem Rad mit Start von Schlossöffnen ist im Offlinemodus nicht möglich!");

		public Task<DoReturnResponse> DoReturn(
			string bikeId,
			LocationDto geolocation,
			ISmartDevice smartDevice,
			Uri operatorUri)
			=> throw new System.Exception("Rückgabe im Offlinemodus nicht möglich!");

		/// <summary> Returns a bike and starts closing. </summary>
		/// <param name="bikeId">Id of the bike to return.</param>
		/// <param name="smartDevice">Provides info about hard and software.</param>
		/// <param name="operatorUri">Holds the uri of the operator or null, in case of single operator setup.</param>
		/// <returns>Response on returning request.</returns>
		public Task<DoReturnResponse> ReturnAndStartClosingAsync(
			string bikeId,
			ISmartDevice smartDevice,
			Uri operatorUri)
			=> throw new System.Exception("Rückgabe mit Schloss schließen Befehl im Offlinemodus nicht möglich!");

		public Task<SubmitFeedbackResponse> DoSubmitFeedback(string bikeId, int? currentChargeBars, string message, bool isBikeBroken, Uri operatorUri) =>
			throw new System.Exception("Übermittlung von Feedback im Offlinemodus nicht möglich!");

		/// <summary> Submits mini survey to copri server. </summary>
		/// <param name="answers">Collection of answers.</param>
		public Task<ResponseBase> DoSubmitMiniSurvey(IDictionary<string, string> answers)
			=> throw new System.Exception("Übermittlung von der Miniumfrage im Offlinemodus nicht möglich!");

		public Task<AuthorizationResponse> DoAuthorizationAsync(string p_strMailAddress, string p_strPassword, string p_strDeviceId)
		{
			throw new System.Exception("Anmelden im Offlinemodus nicht möglich!");
		}

		public Task<AuthorizationoutResponse> DoAuthoutAsync()
		{
			throw new System.Exception("Abmelden im Offlinemodus nicht möglich!");
		}

		public async Task<BikesAvailableResponse> GetBikesAvailableAsync()
		{
			var l_oBikesAvailableTask = new TaskCompletionSource<BikesAvailableResponse>();
			lock (monkeyLock)
			{
				l_oBikesAvailableTask.SetResult(Barrel.Current.Get<BikesAvailableResponse>(requestBuilder.GetBikesAvailable()));
			}
			return await l_oBikesAvailableTask.Task;
		}

		public async Task<BikesReservedOccupiedResponse> GetBikesOccupiedAsync()
		{
			try
			{
				var l_oBikesOccupiedTask = new TaskCompletionSource<BikesReservedOccupiedResponse>();
				lock (monkeyLock)
				{
					l_oBikesOccupiedTask.SetResult(Barrel.Current.Get<BikesReservedOccupiedResponse>(requestBuilder.GetBikesOccupied()));
				}

				return await l_oBikesOccupiedTask.Task;

			}
			catch (NotSupportedException)
			{
				// No user logged in.
				await Task.CompletedTask;
				return ResponseHelper.GetBikesOccupiedNone();
			}
		}

		public async Task<StationsAvailableResponse> GetStationsAsync()
		{
			var l_oStationsAllTask = new TaskCompletionSource<StationsAvailableResponse>();
			lock (monkeyLock)
			{
				l_oStationsAllTask.SetResult(Barrel.Current.Get<StationsAvailableResponse>(requestBuilder.GetStations()));
			}
			return await l_oStationsAllTask.Task;
		}

		/// <summary> Gets a value indicating whether stations are expired or not.</summary>
		public bool IsStationsExpired
		{
			get
			{
				lock (monkeyLock)
				{
					return Barrel.Current.IsExpired(requestBuilder.GetStations());
				}
			}
		}

		/// <summary> Adds a stations all response to cache.</summary>
		/// <param name="stations">Stations to add.</param>
		public void AddToCache(StationsAvailableResponse stations)
		{
			AddToCache(stations, ExpiresAfter);
		}

		/// <summary> Adds a stations all response to cache.</summary>
		/// <param name="stations">Stations to add.</param>
		/// <param name="expiresAfter">Time after which anser is considered to be expired.</param>
		private void AddToCache(StationsAvailableResponse stations, TimeSpan expiresAfter)
		{
			lock (monkeyLock)
			{
				Barrel.Current.Add(
					requestBuilder.GetStations(),
					JsonConvertRethrow.SerializeObject(stations),
					expiresAfter);
			}
		}

		/// <summary> Gets a value indicating whether stations are expired or not.</summary>
		public bool IsBikesAvailableExpired
		{
			get
			{
				lock (monkeyLock)
				{
					return Barrel.Current.IsExpired(requestBuilder.GetBikesAvailable());
				}
			}
		}

		/// <summary> Adds a bikes response to cache.</summary>
		/// <param name="bikes">Bikes to add.</param>
		public void AddToCache(BikesAvailableResponse bikes)
		{
			AddToCache(bikes, ExpiresAfter);
		}

		/// <summary> Adds a bikes response to cache.</summary>
		/// <param name="bikes">Bikes to add.</param>
		/// <param name="expiresAfter">Time after which anser is considered to be expired.</param>
		private void AddToCache(BikesAvailableResponse bikes, TimeSpan expiresAfter)
		{
			lock (monkeyLock)
			{
				Barrel.Current.Add(
					requestBuilder.GetBikesAvailable(),
					JsonConvertRethrow.SerializeObject(bikes),
					expiresAfter);
			}
		}

		/// <summary> Gets a value indicating whether stations are expired or not.</summary>
		public bool IsBikesOccupiedExpired
		{
			get
			{
				lock (monkeyLock)
				{
					return Barrel.Current.IsExpired(requestBuilder.GetBikesOccupied());
				}
			}
		}

		/// <summary> Adds a bikes response to cache.</summary>
		/// <param name="bikes">Bikes to add.</param>
		public void AddToCache(BikesReservedOccupiedResponse bikes)
		{
			AddToCache(bikes, ExpiresAfter);

		}
		/// <summary> Adds a bikes response to cache.</summary>
		/// <param name="bikes">Bikes to add.</param>
		/// <param name="expiresAfter">Time after which anser is considered to be expired.</param>
		private void AddToCache(BikesReservedOccupiedResponse bikes, TimeSpan expiresAfter)
		{
			lock (monkeyLock)
			{
				Barrel.Current.Add(
					requestBuilder.GetBikesOccupied(),
					JsonConvertRethrow.SerializeObject(bikes),
					expiresAfter);
			}
		}
	}
}