using Wayne.ForecourtControl.Fusion.ReadDeviceStatus;
using Wayne.Lib;
using Wayne.Lib.StateEngine;
using Wayne.Lib.StateEngine.Generic;

namespace Wayne.ForecourtControl.Fusion.StatusStateMachine.States
{
    [TimeoutDescription(BasicTransitionType.Error)]
    [EventDescription(EventType.Response, "Success", BasicTransitionType.Done)]
    [EventDescription(EventType.Response, "Failure", BasicTransitionType.Error)]
    internal abstract class ReadFromFdcConfigurationBase<TServiceResponse> : TimeoutState<ReadDeviceStatusController>
    {
        private object _userToken;

        protected override void Enter(StateEntry stateEntry, ref Transition transition)
        {
            base.Enter(stateEntry, ref transition);

            MakeRequest(_userToken = new object());
        }

        protected abstract void MakeRequest(object userToken);


        protected override void HandleNonTimeoutEvent(StateEngineEvent stateEngineEvent, ref Transition transition)
        {
            GenericEvent<AsyncCompletedEventArgs> genericEvent = stateEngineEvent as GenericEvent<AsyncCompletedEventArgs>;
            if (genericEvent != null && genericEvent.EventArgs.UserToken.Equals(_userToken))
            {
                _userToken = null;
                genericEvent.Handled = true;
                if (genericEvent.EventArgs.Success)
                {
                    genericEvent.EventArgs.WhenOfType((AsyncCompletedEventArgs<TServiceResponse> args) =>
                            Response(args.Result));
                    transition = new Transition(this, BasicTransitionType.Done);
                }
                else
                {
                    transition = new Transition(this, BasicTransitionType.Error);
                }
            }
        }

        protected abstract void Response(TServiceResponse args);

        protected override int TimeoutInterval
        {
            get { return 10000; }
        }

        protected override void Timeout(ref Transition transition)
        {
            transition = new Transition(this, BasicTransitionType.Error);
        }
    }
}