//GameManager
//Singleton and persistent object to manage game state
//For high level control over game
//--------------------------------------------------------------
using UnityEngine;
using System.Collections;

public class GameManager : MonoBehaviour
{
    //C# property to retrieve currently active instance of object, if any
    public static GameManager Instance
    {
     get
     {
      if (instance == null) instance = new GameObject ("GameManager").AddComponent<GameManager>(); //create game manager object if required
      return instance;
     }
    }
    //Internal reference to single active instance of object - for singleton behaviour
    private static GameManager instance = null;
       
    // Called before Start on object creation
    void Awake()
    {    
     //Check if there is an existing instance of this object
     if((instance) && (instance.GetInstanceID() != GetInstanceID()))
      DestroyImmediate(gameObject); //Delete duplicate
     else
     {
      instance = this; //Make this object the only instance
      DontDestroyOnLoad (gameObject); //Set as do not destroy
     }
    }
    public void RestartGame()
    {
     //Load first level
     Application.LoadLevel(0);
    }
    public void ExitGame()
    {
     Application.Quit();
    }
}