//

// InternetExplorer.cs

//

// Author:

//       Vsevolod Kukol <sevoku@microsoft.com>

//

// Copyright (c) 2016 (c) Vsevolod Kukol

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

// THE SOFTWARE.

using Microsoft.Win32;

using System.IO;



namespace Microsoft.WindowsAPICodePack.InternetExplorer

{

	/// <summary>Internet Explorer Emulation Modes</summary>

	/// <remarks>https://msdn.microsoft.com/de-de/library/ee330730.aspx#browser_emulation</remarks>

	public enum IEEmulationMode

	{

		IE7 = 0x00001b58,

		IE8 = 0x00001f40,

		IE8Force = 0x000022b8,

		IE9 = 0x00002328,

		IE9Force = 0x0000270f,

		IE10 = 0x00002710,

		IE10Force = 0x00002711,

		IE11 = 0x00002af8,

		IE11Force = 0x00002af9,

		Default = IE7,

	}



	public static class InternetExplorer

	{

		static readonly string browserEmulationKeyPath = @"Software\\Microsoft\\Internet Explorer\\Main\\FeatureControl\\FEATURE_BROWSER_EMULATION";



		/// <summary>

		/// Gets or sets the embedded IE emulation mode.

		/// </summary>

		/// <value>The emulation mode.</value>

		public static IEEmulationMode EmulationMode {

			get {

				var regKey = Registry.CurrentUser.OpenSubKey (browserEmulationKeyPath, false);

				if (regKey == null)

					return IEEmulationMode.Default;



				var myProgramName = Path.GetFileName (System.Reflection.Assembly.GetEntryAssembly ().Location);

				var currentValue = regKey.GetValue (myProgramName);

				return currentValue is int ? (IEEmulationMode)currentValue : IEEmulationMode.Default;

			}

			set {

				if (EmulationMode == value) // load current value and update it only if necessary

					return;

				var regKey = Registry.CurrentUser.CreateSubKey (browserEmulationKeyPath, RegistryKeyPermissionCheck.ReadWriteSubTree);



				var executableName = Path.GetFileName (System.Reflection.Assembly.GetEntryAssembly ().Location);

				var currentValue = regKey.GetValue (executableName);

				if (currentValue == null || !(currentValue is int) || (int)currentValue != (int)value)

					regKey.SetValue (executableName, (int)value, RegistryValueKind.DWord);

			}

		}

	}

}