using UnityEngine;
using UnityEditor;
using System.Collections.Generic;

public class ClassWindow : EditorWindow
{	
	private static ClassWindow window;
	public List< ClassA > list;
	
    [MenuItem ("My Window/Class")]
    static void Init () 
	{
        window = EditorWindow.GetWindow (typeof (ClassWindow)) as ClassWindow;
		Debug.Log("Init"); 
    }
	
	private void OnGUI()
	{
		if( list == null )
			list = new List<ClassA>();
		
		if( window == null )
			Init();
		
		GUILayout.BeginArea( new Rect( 10, 10, window.position.width - 20, 75 ) );
			GUILayout.BeginHorizontal();
				if( GUILayout.Button( "Add Class A", GUILayout.ExpandHeight(true) ) )
					list.Add( ScriptableObject.CreateInstance< ClassA >() );
				
				if( GUILayout.Button( "Add Class B", GUILayout.ExpandHeight(true) ) )
					list.Add( ScriptableObject.CreateInstance< ClassB >() );
		
				if( GUILayout.Button( "Clear", GUILayout.ExpandHeight(true) ) )
					list.Clear();
				
				if( GUILayout.Button( "Save", GUILayout.ExpandHeight(true) ) )
				{
			        ClassHolder asset = new ClassHolder(list);  //scriptable object
					Debug.Log( list.Count );
			        AssetDatabase.CreateAsset(asset, "Assets/classes.asset");
			        AssetDatabase.SaveAssets();
				}
			
				if( GUILayout.Button( "Load", GUILayout.ExpandHeight(true) ) )
				{
		            Object o = AssetDatabase.LoadAssetAtPath("Assets/classes.asset", typeof(ClassHolder));
					Debug.Log( "o : " + o.ToString() );
		            ClassHolder classHolder = (ClassHolder)o;
					Debug.Log( "classHolder : " + classHolder );
			
					if( classHolder != null )
		            	list = classHolder.list;
				}
			GUILayout.EndHorizontal();
		GUILayout.EndArea();
		
		// Once you compile again, this is going to display only 'AAAAAAAAA'
		GUILayout.BeginArea( new Rect( 10, 110, 200, 200 ) );
			GUILayout.Space(20);
			GUILayout.Label( "Childcount : " + list.Count );
			GUILayout.Space(20);
			foreach( ClassA a in list )
				if( a != null )
					a.Draw();
		GUILayout.EndArea();
	}
}