using System;
using UnityEngine;
using UnityEngine.UI;


[RequireComponent(typeof(Text))]
public class RollNumber:MonoBehaviour {

    [SerializeField]
    Text m_Text;
    public Text text {
        get {
            return m_Text;
        }
    }

    float to = 0;
    float from = 0;
    float now = 0;

    float duration = 0f;
    float timer = 0f;
    Action endCallBack = null;

    public void Perform(int _from,int _to,float _duration,Action _callBack) {
        ResetTimer();
        duration = Mathf.Clamp(_duration,0f,float.MaxValue);
        from = _from;
        to = _to;
        endCallBack = _callBack;
    }

    private void LateUpdate() {
        if(timer < duration) {
            timer += Time.deltaTime;
            now = Mathf.Lerp(from,to,Mathf.Clamp01(timer / duration));
            if(timer > duration) {
                ResetTimer();
                now = to;
                if(endCallBack != null) {
                    endCallBack();
                    endCallBack = null;
                }
            }

            if(text != null) {
                var nowInt = (int)now;
                text.text = nowInt.ToString();
            }
        }
    }

    private void ResetTimer() {
        timer = 0f;
        duration = 0f;
    }
}