using System.Globalization;
using UnityEditor;
using UnityEngine;

[InitializeOnLoad]
public static class HierarchyEnhancer
{
	private static GUIStyle _style;

	static HierarchyEnhancer ()
	{
		_style = null;
		EditorApplication.hierarchyWindowItemOnGUI = OnGUI;
	}

	private static void OnGUI (int instanceID, Rect selectionRect)
	{
		if (_style == null)
			_style = new GUIStyle (EditorStyles.label) {alignment = TextAnchor.UpperRight, richText = true};

		GameObject go = EditorUtility.InstanceIDToObject (instanceID) as GameObject;

		/*
		byte c = EditorGUIUtility.isProSkin ? (byte)56 : (byte)194;
		GUI.color = new Color32 (c, c, c, 255);
		GUI.DrawTexture (selectionRect, EditorGUIUtility.whiteTexture);
		//		GUI.color = UniqueColor (LayerMask.LayerToName (go.layer), 25);
		//		GUI.DrawTexture (selectionRect, EditorGUIUtility.whiteTexture);
		//		GUI.color = Color.white;
		//		GUI.Label (selectionRect, go.name);

		GUI.color = go.layer == 0 ? Color.white : UniqueColor (LayerMask.LayerToName (go.layer));
		GUI.Label (selectionRect, go.name);
		GUI.color = Color.white;
		//*/

		selectionRect.width -= 16;

		string label = "";

		//		if (go.layer != 0)
		//			label += "<color=#" + UniqueStrColor (LayerMask.LayerToName (go.layer)) + ">[" +
		//				LayerMask.LayerToName (go.layer) +
		//				"]</color> ";

		if (!go.CompareTag ("Untagged"))
			label += "<color=#" + UniqueStrColor (go.tag) + ">(" + go.tag + ")</color> ";

		if (go.transform.childCount > 0)
			label += go.transform.childCount.ToString (CultureInfo.InvariantCulture);

		GUI.Label (selectionRect, label, _style);

		selectionRect.x = selectionRect.xMax;
		selectionRect.width = 16;

		if (!go.activeInHierarchy && go.activeSelf)
			GUI.color = new Color (1, 1, 1, 0.5f);
		go.SetActive (GUI.Toggle (selectionRect, go.activeSelf, "", "OL Toggle"));
		GUI.color = Color.white;
	}

	private static string UniqueStrColor (string str)
	{
		return (str.GetHashCode () & 0xffffff).ToString ("x6");
	}

	private static Color UniqueColor (string str, byte alpha = 255)
	{
		int hash = str.GetHashCode ();
		byte r = (byte)((hash >> 16) & 255);
		byte g = (byte)((hash >> 8) & 255);
		byte b = (byte)(hash & 255);
		return new Color32 (r, g, b, alpha);
	}
}