using UnityEngine;

namespace SanAndreasUnity.Utilities
{

	public class StateMachine {

		IState m_currentState;
		public IState CurrentState { get { return m_currentState; } }
		bool m_isSwitchingState = false;
		public float TimeWhenSwitchedState { get; private set; }
		public long FrameWhenSwitchedState { get; private set; }


		public void SwitchState(IState newState) {

			if(m_isSwitchingState)
				throw new System.Exception("Already switching state");

			if (newState == m_currentState)
				return;

			m_isSwitchingState = true;

			IState oldState = m_currentState;

			m_currentState = newState;


			if(oldState != null)
				oldState.OnBecameInactive();

			m_isSwitchingState = false;

			this.TimeWhenSwitchedState = Time.time;
			this.FrameWhenSwitchedState = Time.frameCount;

			if(m_currentState != null)
				m_currentState.OnBecameActive();

		}

	}

}