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using System;

using System.Collections.Generic;

using System.Linq;

namespace SimpleStateMachine {

public class State {

public State(string Key, string Description, string[] transitions) {

this.Key = Key;

this.Description = Description;

this.Transitions = transitions;

}

public string Key { get; private set; }

public string Description { get; private set; }

public string[] Transitions { get; private set; }

public delegate void EventHandler(string State);

public EventHandler OnEnter; //Pass previous state

public EventHandler OnExit; //Pass new state

}

[Serializable]

public abstract class StateMachine {

[NonSerialized]

private Dictionary<string, State> _states = new Dictionary<string, State>();

//This should allow serialization of the state

protected string currentState;

private State getState(string Key) {

if (_states.Count == 0 || string.IsNullOrEmpty(Key))

return null;

return _states[Key];

}

public string State {

get {

return currentState;

}

set {

if (currentState == value)

return;

if (!string.IsNullOrEmpty(currentState) && !Transitions.Contains(value))

throw new ArgumentException("Invalid Transition!");

State tmpState = getState(currentState);

if (null != tmpState && null != tmpState.OnExit) {

foreach (State.EventHandler handler in getState(currentState).OnExit.GetInvocationList()) {

handler(value);

}

}

string prev_state = currentState;

currentState = value;

tmpState = getState(currentState);

if (null != tmpState && null != tmpState.OnEnter) {

foreach (State.EventHandler handler in tmpState.OnEnter.GetInvocationList()) {

handler(prev_state);

}

}

}

}

public string[] Transitions { get { return getState(currentState).Transitions; } }

//Setup functions

protected State[] States {

set {

foreach(State s in value) {

_states.Add(s.Key, s);

}

}

}

protected string InitialState {

set {

State = value; //This makes sure onEnter gets called for the InitialState

}

}

}

}