// file: CountdownGraphical.cs
using UnityEngine;
using System.Collections;

public class CountdownGraphical : MonoBehaviour {
  public Texture2D imageDigit1;
  public Texture2D imageDigit2;
  public Texture2D imageDigit3;
  public Texture2D imageDigit4;
  public Texture2D imageDigit5;
  public Texture2D imageBlastOffText;
  
  private int countdownTimerDelay;
  private float countdownTimerStartTime;
  
  void Awake(){
    CountdownTimerReset( 5 );
  }
  
  void OnGUI(){
    GUILayout.Label( CountdownTimerImage() );
  }
  
  void CountdownTimerReset(int delayInSeconds){
    countdownTimerDelay = delayInSeconds;
    countdownTimerStartTime = Time.time;
  }
  
  int CountdownTimerSecondsRemaining(){
    int elapsedSeconds = (int)(Time.time - countdownTimerStartTime);
    int secondsLeft = (countdownTimerDelay - elapsedSeconds);
    return secondsLeft;
  }

  Texture2D CountdownTimerImage(){
    switch( CountdownTimerSecondsRemaining() ){
    case 5:
      return imageDigit5;
    case 4:
      return imageDigit4;
    case 3:
      return imageDigit3;
    case 2:
      return imageDigit2;
    case 1:
      return imageDigit1;
    default:
      return imageBlastOffText;
    }
  }
}