/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2012  Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using System.IO;
using Microsoft.Win32;

namespace GreenshotPlugin.Core {
	/// <summary>
	/// Description of EmailConfigHelper.
	/// </summary>
	public static class EmailConfigHelper {
		private const string OUTLOOK_PATH_KEY = @"SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\OUTLOOK.EXE";
		private const string MAPI_CLIENT_KEY = @"SOFTWARE\Clients\Mail";
		private const string MAPI_LOCATION_KEY = @"SOFTWARE\Microsoft\Windows Messaging Subsystem";
		private const string MAPI_KEY = @"MAPI";

		public static string GetMapiClient() {
			using (RegistryKey key = Registry.CurrentUser.OpenSubKey(MAPI_CLIENT_KEY, false)) {
				if (key != null) {
					return (string)key.GetValue("");
				} 
			}
			using (RegistryKey key = Registry.LocalMachine.OpenSubKey(MAPI_CLIENT_KEY, false)) {
				if (key != null) {
					return (string)key.GetValue("");
				} else {
					return null;
				}
			}
		}

		public static bool HasMAPI() {
			using (RegistryKey key = Registry.LocalMachine.OpenSubKey(MAPI_LOCATION_KEY, false)) {
				if (key != null) {
					return "1".Equals(key.GetValue(MAPI_KEY, "0"));
				} else {
					return false;
				}
			}
		}
		
		public static string GetOutlookExePath() {
			using (RegistryKey key = Registry.LocalMachine.OpenSubKey(OUTLOOK_PATH_KEY, false)) {
				if (key != null) {
					// "" is the default key, which should point to the outlook location
					return (string)key.GetValue("");
				}
			}
			return null;
		}

		/// <summary>
		/// Check if Outlook is installed
		/// </summary>
		/// <returns>Returns true if outlook is installed</returns>
		public static bool HasOutlook() {
			string outlookPath = GetOutlookExePath();
			if (outlookPath != null) {
				if (File.Exists(outlookPath)) {
					return true;
				}
			}
			return false;
		}
	}
}