using UnityEngine;
using System.Collections;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Text;


public class GameManager : MonoBehaviour {

	private const string saveFileName = "save.xml";
	private MenuManager menuManager;
	private int chemistryUsers = 0;

	public class GameState{
		public int gameFinishCount;
		public int currentLevel;
		public float Volume;
	}

	private GameState state = new GameState();
	public GameState State{
		get{return state; }
	}

	string GetSaveFilePath(){
		return Application.persistentDataPath + "/" + saveFileName;
	}

	// Use this for initialization
	void Start () {
		var src = gameObject.AddComponent<AudioSource> ();
		src.volume = 1.0f;
		menuManager = GameObject.FindObjectOfType<MenuManager> ();
		LoadState ();
	}

	public void ActivateChemistry(){
		chemistryUsers++;
	}

	public void DeactivateChemistry(){
		chemistryUsers--;
	}
	
	// Update is called once per frame
	void Update () {
		//Debug.Log (Time.timeScale);
	}

	public void NewGame(){
		menuManager.ActivateMenu ("");
		Application.LoadLevel ("Level0");
	}

	public void MainMenu(){
		SaveState ();
		menuManager.ActivateMenu ("");
		Application.LoadLevel("StartScene");
	}

	public void SaveState(){
		Debug.Log ("Saving game state!");
		XmlSerializer serializer = new XmlSerializer (typeof(GameState));
		FileStream fs = new FileStream (GetSaveFilePath(), FileMode.Create);
		TextWriter writer = new StreamWriter(fs, new UTF8Encoding());
		serializer.Serialize(writer, state);
		writer.Close();
	}

	public void LoadState(){
		Debug.Log ("Loading game state!");
		if (File.Exists (GetSaveFilePath ())) {
			XmlSerializer serializer = new XmlSerializer (typeof(GameState));
			FileStream fs = new FileStream (GetSaveFilePath(), FileMode.Open);
			TextReader reader = new StreamReader(fs, new UTF8Encoding());
			state = (GameState)serializer.Deserialize(reader);
			reader.Close();
		}

	}
	public void LoadLevel(int id){

	}

	/*void OnGUI(){
		if (chemistryUsers > 0) {
			GUI.Button(new Rect(200,200,100,100), "Chemistry activated");
		}
	}*/
}