Unity 3D State Manager: Game State Manager C# Script

/*
    Unity 3D: Game State Manager Script Source for State Manager

    Copyright 2012 FIZIX Digital Agency
    http://www.fizixstudios.com

    For more information see the tutorial at:
    http://www.fizixstudios.com/labs/do/view/id/unity-game-state-manager


    Notes:
        This script is a C# game state manager for Unity 3D; you should review the gamestart.cs
        script to help understand how to implement game states.
*/



using UnityEngine;
using System.Collections;

public class gamestate : MonoBehaviour {

    // Declare properties
    private static gamestate instance;
    private string activeLevel;         // Active level
    private string name;                // Characters name
    private int maxHP;                  // Max HP
    private int maxMP;                  // Map MP
    private int hp;                     // Current HP
    private int mp;                     // Current MP
    private int str;                    // Characters Strength
    private int vit;                    // Characters Vitality
    private int dex;                    // Characters Dexterity
    private int exp;                    // Characters Experience Points



    // ---------------------------------------------------------------------------------------------------
    // gamestate()
    // ---------------------------------------------------------------------------------------------------
    // Creates an instance of gamestate as a gameobject if an instance does not exist
    // ---------------------------------------------------------------------------------------------------
    public static gamestate Instance
    {
        get
        {
            if(instance == null)
            {
                instance = new GameObject("gamestate").AddComponent<gamestate> ();
            }

            return instance;
        }
    }

    // Sets the instance to null when the application quits
    public void OnApplicationQuit()
    {
        instance = null;
    }
    // ---------------------------------------------------------------------------------------------------


    // ---------------------------------------------------------------------------------------------------
    // startState()
    // ---------------------------------------------------------------------------------------------------
    // Creates a new game state
    // ---------------------------------------------------------------------------------------------------
    public void startState()
    {
        print ("Creating a new game state");

        // Set default properties:
        activeLevel = "Level 1";
        name = "My Character";
        maxHP = 250;
        maxMP = 60;
        hp = maxHP;
        mp = maxMP;
        str = 6;
        vit = 5;
        dex = 7;
        exp = 0;

        // Load level 1
        Application.LoadLevel("level1");
    }



    // ---------------------------------------------------------------------------------------------------
    // getLevel()
    // ---------------------------------------------------------------------------------------------------
    // Returns the currently active level
    // ---------------------------------------------------------------------------------------------------
    public string getLevel()
    {
        return activeLevel;
    }


    // ---------------------------------------------------------------------------------------------------
    // setLevel()
    // ---------------------------------------------------------------------------------------------------
    // Sets the currently active level to a new value
    // ---------------------------------------------------------------------------------------------------
    public void setLevel(string newLevel)
    {
        // Set activeLevel to newLevel
        activeLevel = newLevel;
    }


    // ---------------------------------------------------------------------------------------------------
    // getName()
    // ---------------------------------------------------------------------------------------------------
    // Returns the characters name
    // ---------------------------------------------------------------------------------------------------
    public string getName()
    {
        return name;
    }


    // ---------------------------------------------------------------------------------------------------
    // getHP()
    // ---------------------------------------------------------------------------------------------------
    // Returns the characters hp
    // ---------------------------------------------------------------------------------------------------
    public int getHP()
    {
        return hp;
    }

    // ---------------------------------------------------------------------------------------------------
    // getMP()
    // ---------------------------------------------------------------------------------------------------
    // Returns the characters mp
    // ---------------------------------------------------------------------------------------------------
    public int getMP()
    {
        return mp;
    }
}