#if UNITY_EDITOR
using UnityEngine;
using UnityEditor;
using System;
using System.IO;
using System.Collections.Generic;

namespace ProGrids
{
	[InitializeOnLoad]
	public static class pg_IconUtility
	{
		const string ICON_FOLDER_PATH = "ProGridsToggles";
		private static string iconFolderPath = "Assets/ProCore/ProGrids/GUI/ProGridsToggles/";

		static pg_IconUtility()
		{
			if(!Directory.Exists(iconFolderPath))
			{
				string folder = FindFolder(ICON_FOLDER_PATH);

				if(Directory.Exists(folder))
					iconFolderPath = folder;
			}
		}

		private static string FindFolder(string folder)
		{
#if !UNITY_WEBPLAYER
			string single = folder.Replace("\\", "/").Substring(folder.LastIndexOf('/') + 1);

			string[] matches = Directory.GetDirectories("Assets/", single, SearchOption.AllDirectories);

			foreach(string str in matches)
			{
				string path = str.Replace("\\", "/");

				if(path.Contains(folder))
				{
					if(!path.EndsWith("/"))
						path += "/";

					return path;
				}
			}
#endif
			Debug.LogError("Could not locate ProGrids/GUI/ProGridsToggles folder.  The ProGrids folder may be moved, but the contents of ProGrids must remain unmodified.");

			return "";
		}

		public static Texture2D LoadIcon(string iconName)
		{
			string iconPath = string.Format("{0}{1}", iconFolderPath, iconName);

			if(!File.Exists(iconPath))
			{
				Debug.LogError("ProGrids failed to locate menu image: " + iconName + ".\nThis can happen if the GUI folder is moved or deleted.  Deleting and re-importing ProGrids will fix this error.");
				return (Texture2D) null;
			}

			return LoadAssetAtPath<Texture2D>(iconPath);
		}

		static T LoadAssetAtPath<T>(string path) where T : UnityEngine.Object
		{
			return (T) AssetDatabase.LoadAssetAtPath(path, typeof(T));
		}
	}
}
#endif