using UnityEngine;
using System.Collections;

public enum ElevatorState{
	Idle,
	Moving
}

public class ElevatorController : MonoBehaviour {
	public Trigger startTrigger;
	public ElevatorState state;
	public GameObject target;
	public float moveState;
	private float moveDirection = 1.0f;
	private Vector3 startupPosition;
	private Vector3 targetPosition;
	public float speed = 2.0f;
	public AudioSource startStopSource;
	public AudioSource moveSource;
	public AudioClip startSound;
	public AudioClip stopSound;
	public AudioClip moveSound;


	void Start () {
		startupPosition = transform.localPosition;
		targetPosition = startupPosition + transform.InverseTransformPoint(target.transform.position);
		targetPosition.z = startupPosition.z;

		if(startTrigger != null){
			startTrigger.Trig +=	 HandleTrig;
		}
	}

	void HandleTrig ()
	{
		Debug.Log("Trig");
		if(state == ElevatorState.Idle){
			StartMovement();
		}
	}

	void StartMovement(){
		SetState(ElevatorState.Moving);
	}

	void SetState(ElevatorState s){
		if(state == s){
			return;
		}
		if(s == ElevatorState.Moving){
			startStopSource.PlayOneShot(startSound);
			moveSource.clip = moveSound;
			moveSource.loop = true;
			moveSource.PlayDelayed(0.5f);
		}else{
			moveSource.Stop();
			startStopSource.PlayOneShot(stopSound);
			moveDirection = -moveDirection;
		}
		state = s;
		Debug.Log("Set state: " + state);
	}

	void FixedUpdate(){

	}

	void Update () {
		if(state == ElevatorState.Moving){
			Vector3 t = moveDirection > 0 ? targetPosition : startupPosition;
			Vector3 dir = t - transform.localPosition;
			float dist = dir.magnitude;
			
			if(dist <= 0.001f){
				transform.localPosition = t;
				SetState(ElevatorState.Idle);
				
			}else{
				float moveLen = speed * Time.deltaTime;
				if(moveLen > dist){
					moveLen = dist;
				}
				
				transform.localPosition += dir.normalized * moveLen;
			}
			
			
			
		}

	}
}