using UnityEngine;
using System.Collections;

public class FloatingTextUp2D : MonoBehaviour {
  private UILabel 		__label;			// from ScriptIncluded
  private Vector3			__pos;
  private Vector3			__initPos;
  
  public Camera			guiCamera = null;
  public Camera			worldCamera = null;
  
  public GameObject		targetObject = null;
  public int				tweenTime = 2;
  public int				tweenDistance = 50;

	// class spec function
	//
	public void destroySelf() {
		Destroy( gameObject );
	}
	
	public void initAndStartMoving( Vector3 initPos_, Camera mainCam_ = null, Camera guiCam_ = null )
	{
		if( mainCam_ != null ) worldCamera = mainCam_;
		if( guiCam_ != null ) guiCamera = guiCam_;
		startMoveUp( initPos_, 2, 50 );
	}
	
	public void startMoveUp( Vector3 initPos_, int tweenDuration_, int tweenEnd_ )
	{
		__initPos = initPos_;
		calculatePosition( initPos_ );
		
		TweenPosition _tp = this.tweenPosition;
		_tp.duration = tweenDuration_;
		_tp.from = transform.localPosition;
		_tp.to = _tp.from + Vector3.up * tweenEnd_;
		_tp.eventReceiver = gameObject;
		_tp.callWhenFinished = "destroySelf";		
	}
	
	public void calculatePosition( Vector3 pos_ )
	{
		__pos = worldCamera.WorldToViewportPoint( pos_ );
		__pos = guiCamera.ViewportToWorldPoint( __pos );
		__pos.z = 0f;
		transform.position =  __pos;
	}

	// Unity3d reaction function
	//
	public void Awake() {
		__label = GetComponent<UILabel>();
	}
	
	void Start()
	{
		if( guiCamera == null ) guiCamera = NGUITools.FindCameraForLayer( gameObject.layer );
		if( worldCamera == null ) worldCamera = Camera.mainCamera;
		__label.MakePixelPerfect(); // why bigger???
		if( targetObject != null ) {
			startMoveUp( targetObject.transform.position, tweenTime, tweenDistance );
		}
	}
	
	// Property helper
	//
	public TweenPosition tweenPosition {
		get {
			TweenPosition _tp = GetComponent<TweenPosition>();
			if( _tp == null ) _tp = gameObject.AddComponent<TweenPosition>();
			return _tp;
		}
	}
}