using System;
using System.Threading.Tasks;
using TINK.Model.Bike.BluetoothLock;
using TINK.Repository;
using TINK.Repository.Exception;
using TINK.Repository.Request;
using TINK.Repository.Response;
using TINK.Model.User.Account;
using TINK.Model.Device;

namespace TINK.Model.Connector
{
    public class CommandLoggedIn : BaseLoggedIn, ICommand
    {
        /// <summary> True if connector has access to copri server, false if cached values are used. </summary>
        public bool IsConnected => CopriServer.IsConnected;

        /// <summary> Is raised whenever login state has changed.</summary>
        public event LoginStateChangedEventHandler LoginStateChanged;

        /// <summary>Constructs a copri query object.</summary>
        /// <param name="p_oCopriServer">Server which implements communication.</param>
        public CommandLoggedIn(ICopriServerBase p_oCopriServer,
            string p_strSessionCookie,
            string p_strMail,
            Func<DateTime> p_oDateTimeProvider) : base(p_oCopriServer,  p_strSessionCookie, p_strMail, p_oDateTimeProvider)
        {
        }

        /// <summary>
        /// Logs user in.
        /// If log in succeeds either and session might be updated if it was no more valid (logged in by an different device).
        /// If log in fails (password modified) session cookie is set to empty.
        /// If communication fails an TINK.Repository.Exception is thrown.
        /// </summary>
        /// <param name="p_oAccount">Account to use for login.</param>
        public Task<IAccount> DoLogin(string p_strMail, string p_strPassword, string p_strDeviceId)
        {
            if (string.IsNullOrEmpty(p_strMail))
            {
                throw new ArgumentNullException("Can not loging user. Mail address must not be null or empty.");
            }

            throw new Exception($"Fehler beim Anmelden von unter {p_strMail}. Benutzer {Mail} ist bereits angemeldet.");
        }

        /// <summary> Logs user out. </summary>
        public async Task DoLogout()
        {
            AuthorizationoutResponse l_oResponse = null;
            try
            {
                l_oResponse = (await CopriServer.DoAuthoutAsync()).GetIsResponseOk();
            }
            catch (AuthcookieNotDefinedException)
            {
                // Cookie is no more defined, i.e. no need to logout user at copri because user is already logged out.
                // Just ignore this error.
                // User logged out, log in state changed. Notify parent object to update.
                LoginStateChanged?.Invoke(this, new LoginStateChangedEventArgs());
                return;
            }
            catch (Exception)
            {
                throw;
            }

            // User logged out, log in state changed. Notify parent object to update.
            LoginStateChanged?.Invoke(this, new LoginStateChangedEventArgs());
        }

        /// <summary>
        /// Request to reserve a bike.
        /// </summary>
        /// <param name="bike">Bike to book.</param>
        public async Task DoReserve(Bikes.Bike.BC.IBikeInfoMutable bike)
        {
            if (bike == null)
            {
                throw new ArgumentNullException("Can not reserve bike. No bike object available.");
            }

            BikeInfoReservedOrBooked response;
            try
            {
                response = (await CopriServer.DoReserveAsync(bike.Id, bike.OperatorUri)).GetIsReserveResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent excepitons detected.
                throw;
            }

            bike.Load(response, Mail, DateTimeProvider, Bikes.Bike.BC.NotifyPropertyChangedLevel.None);
        }

        /// <summary> Request to cancel a reservation.</summary>
        /// <param name="bike">Bike to cancel reservation.</param>
        public async Task DoCancelReservation(
            Bikes.Bike.BC.IBikeInfoMutable bike)
        {
            if (bike == null)
            {
                throw new ArgumentNullException("Can not cancel reservation of bike. No bike object available.");
            }

            ReservationCancelReturnResponse response;
            try
            {
                response = (await CopriServer.DoCancelReservationAsync(bike.Id, bike.OperatorUri)).GetIsCancelReservationResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent excepitons detected.
                throw;
            }

            bike.Load(Bikes.Bike.BC.NotifyPropertyChangedLevel.None);
        }

        /// <summary> Get authentication keys.</summary>
        /// <param name="bike">Bike to get new keys for.</param>
        public async Task CalculateAuthKeys(Bikes.Bike.BluetoothLock.IBikeInfoMutable bike)
        {
            if (bike == null)
            {
                throw new ArgumentNullException("Can not calculate auth keys. No bike object available.");
            }

            switch (bike.State.Value)
            {
                case State.InUseStateEnum.Reserved:
                case State.InUseStateEnum.Booked:
                    break;

                default:
                    throw new ArgumentNullException($"Can not calculate auth keys. Unexpected bike state {bike.State.Value} detected.");
            }

            BikeInfoReservedOrBooked response;
            Guid guid = (bike is BikeInfoMutable btBike) ? btBike.LockInfo.Guid : new Guid();
            try
            {
                response = (await CopriServer.CalculateAuthKeysAsync(bike.Id, bike.OperatorUri)).GetIsBookingResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent excepitons detected.
                throw;
            }

            UpdaterJSON.Load(
                bike, 
                response, 
                Mail, 
                DateTimeProvider,
                Bikes.Bike.BC.NotifyPropertyChangedLevel.None);
        }

        /// <summary> Updates COPRI lock state for a booked bike. </summary>
        /// <param name="bike">Bike to update locking state for.</param>
        /// <returns>Response on updating locking state.</returns>
        public async Task UpdateLockingStateAsync(
            Bikes.Bike.BluetoothLock.IBikeInfoMutable bike, LocationDto location)
        {
            if (bike == null)
            {
                throw new ArgumentNullException("Can not book bike. No bike object available.");
            }

            if (bike.State.Value != State.InUseStateEnum.Booked)
            {
                throw new ArgumentNullException($"Can not update locking state of bike. Unexpected booking state {bike.State} detected.");
            }

            lock_state? state = null;
            switch (bike.LockInfo.State)
            {
                case LockingState.Open:
                    state = lock_state.unlocked;
                    break;

                case LockingState.Closed:
                    state = lock_state.locked;
                    break;
            }

            if (!state.HasValue)
            {
                throw new ArgumentNullException($"Can not update locking state of bike. Unexpected locking state {bike.LockInfo.State} detected.");
            }

            try
            {
                (await CopriServer.UpdateLockingStateAsync(
                    bike.Id, 
                    location, 
                    state.Value, 
                    bike.LockInfo.BatteryPercentage,
                    bike.OperatorUri)).GetIsBookingResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent excepitons detected.
                throw;
            }
        }


        /// <summary> Request to book a bike. </summary>
        /// <param name="bike">Bike to book.</param>
        public async Task DoBook(
            Bikes.Bike.BluetoothLock.IBikeInfoMutable bike)
        {
            if (bike == null)
            {
                throw new ArgumentNullException(nameof(bike), "Can not book bike. No bike object available.");
            }

            BikeInfoReservedOrBooked response;
            var btBike = bike as BikeInfoMutable;
            Guid guid = btBike != null ? btBike.LockInfo.Guid : new Guid();
            double batteryPercentage = btBike != null ? btBike.LockInfo.BatteryPercentage : double.NaN;
            try
            {
                response = (await CopriServer.DoBookAsync(
                    bike.Id, 
                    guid, 
                    batteryPercentage,
                    bike.OperatorUri)).GetIsBookingResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent excepitons detected.
                throw;
            }

            bike.Load(
                response, 
                Mail, 
                DateTimeProvider,
                Bikes.Bike.BC.NotifyPropertyChangedLevel.None);
        }

        /// <summary> Request to return a bike.</summary>
        /// <param name="bike">Bike to return.</param>
        /// <param name="locaton">Position of the bike.</param>
        /// <param name="smartDevice">Provides info about hard and software.</param>
        public async Task DoReturn(
            Bikes.Bike.BluetoothLock.IBikeInfoMutable bike,
            LocationDto location,
            ISmartDevice smartDevice)
        {
            if (bike == null)
            {
                throw new ArgumentNullException("Can not return bike. No bike object available.");
            }

            ReservationCancelReturnResponse l_oResponse;
            try
            {
                l_oResponse = (await CopriServer.DoReturn(bike.Id, location, smartDevice,  bike.OperatorUri)).GetIsReturnBikeResponseOk(bike.Id);
            }
            catch (Exception)
            {
                // Exception was not expected or too many subsequent exceptions detected.
                throw;
            }

            bike.Load(Bikes.Bike.BC.NotifyPropertyChangedLevel.None);
        }

        /// <summary>
        /// Submits feedback to copri server.
        /// </summary>
        /// <param name="userFeedback">Feedback to submit.</param>
#if USCSHARP9
        public async Task DoSubmitFeedback(ICommand.IUserFeedback userFeedback, Uri opertorUri)
            => await CopriServer.DoSubmitFeedback(userFeedback.BikeId, userFeedback.Message, userFeedback.IsBikeBroken, opertorUri);
#else
        public async Task DoSubmitFeedback(IUserFeedback userFeedback, Uri opertorUri)
            => await CopriServer.DoSubmitFeedback(userFeedback.BikeId, userFeedback.Message, userFeedback.IsBikeBroken, opertorUri);
#endif
    }
}