using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;

namespace BuzzGUI.Common
{
	public static class RegistryEx
	{
		static readonly string regpath = Global.RegistryRoot;

		public static void Write<T>(string key, T x, string path = "BuzzGUI")
		{
			try
			{
				var regkey = Microsoft.Win32.Registry.CurrentUser.CreateSubKey(regpath + "\\" + path);
				if (regkey == null) return;
				regkey.SetValue(key, x.ToString());
			}
			catch (Exception) { }

		}

		public static T Read<T>(string key, T def, string path = "BuzzGUI")
		{
			try
			{
				var regkey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(regpath + "\\" + path);
				if (regkey == null) return def;
				object o = regkey.GetValue(key);
				if (o == null) return def;
				return (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromString(o.ToString());
			}
			catch (Exception) 
			{
				return def;
			}

		}

		public static IEnumerable<T> ReadNumberedList<T>(string key, string path = "BuzzGUI")
		{
			var regkey = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(regpath + "\\" + path);
			if (regkey == null) yield break;

			int i = 0;
			while (i++ < 0x7fffffff)
			{
				object o = regkey.GetValue(key + i.ToString());
				if (o == null) yield break;
				yield return (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromString(o.ToString());
			}
		}

		public static RegistryMonitor CreateMonitor(string path = "BuzzGUI")
		{
			return new RegistryMonitor(Microsoft.Win32.RegistryHive.CurrentUser, regpath + path);
		}

	}
}