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

public class FPSCounter : MonoBehaviour
{
    public static float msec;
    public static float fps;
    public static float avgFps
    {
        get
        {
            return (minFps + maxFps) / 2;
        }
    }
    public static float maxFps = Mathf.NegativeInfinity;
    public static float minFps = Mathf.Infinity;
    public bool showFPS;
    public Text text;
    float deltaTime = 0.0f;

    public void Awake()
    {
        StartCoroutine(ResetCounter(3));
    }

    void Update()
    {
        deltaTime += (Time.deltaTime - deltaTime) * 0.1f;
        msec = deltaTime * 1000.0f;
        fps = 1.0f / deltaTime;

        minFps = fps < minFps ? fps : minFps;
        maxFps = fps > maxFps ? fps : maxFps;

        if (showFPS)
            text.text = ((int)fps).ToString();
        else
            text.gameObject.SetActive(false);
    }

    public IEnumerator ResetCounter(float period)
    {
        while (true)
        {
            maxFps = Mathf.NegativeInfinity;
            minFps = Mathf.Infinity;
            yield return new WaitForSeconds(period);
        }

    }

    //void OnGUI()
    //{
    //    if (!showFPS)
    //        return;

    //    int w = Screen.width, h = Screen.height;
    //    GUIStyle style = new GUIStyle();
    //    Rect rect = new Rect(0, 0, w, h * 10 / 100);
    //    style.alignment = TextAnchor.UpperRight;
    //    style.fontSize = h * 3 / 100;
    //    style.normal.textColor = new Color(0.0f, 0.0f, 0.5f, 1.0f);

    //    GUI.Label(rect, "\nMin " + minFps, style);
    //    GUI.Label(rect, "\n\nMax " + maxFps, style);
    //    GUI.Label(rect, "\n\n\nAvg " + avgFps, style);

    //    if (fps < avgFps)
    //        style.normal.textColor = Color.red;
    //    else
    //        style.normal.textColor = Color.green;
    //    string text = string.Format("{0:0.0} ms ({1:0.} fps)", msec, fps);
    //    GUI.Label(rect, text, style);

    //}
}