using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class HUDFPS : MonoBehaviour 
{
	
	// Attach this to a GUIText to make a frames/second indicator.
	//
	// It calculates frames/second over each updateInterval,
	// so the display does not keep changing wildly.
	//
	// It is also fairly accurate at very low FPS counts (<10).
	// We do this not by simply counting frames per interval, but
	// by accumulating FPS for each frame. This way we end up with
	// correct overall FPS even if the interval renders something like
	// 5.5 frames.
	
	public  float updateInterval = 0.5F;
	
	private float accum   = 0; // FPS accumulated over the interval
	private int   frames  = 0; // Frames drawn over the interval
	private float timeleft; // Left time for current interval

	//Text framecounter;

	void Start()
	{
		if( !GetComponent<Text>() )
		{
			Debug.Log("UtilityFramesPerSecond needs a Text component!");
			enabled = false;
			return;

		}
		timeleft = updateInterval;  
	}
	
	void Update()
	{
		timeleft -= Time.deltaTime;
		accum += Time.timeScale/Time.deltaTime;
		++frames;
		GetComponent<Text>().material.color = Color.white;
		// Interval ended - update GUI text and start new interval
		if( timeleft <= 0.0 )
		{
			// display two fractional digits (f2 format)
			float fps = accum/frames;
			string format = System.String.Format("{0:F2} FPS",fps);
			GetComponent<Text>().text = format;
			/*
			if(fps < 30)
				GetComponent<Text>().material.color = Color.yellow;
			else 
				if(fps < 10)
					GetComponent<Text>().material.color = Color.red;
			else
				GetComponent<Text>().material.color = Color.green;
			//	DebugConsole.Log(format,level);
			*/
			timeleft = updateInterval;
			accum = 0.0F;
			frames = 0;
		}
	}
}