/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2020 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/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;
namespace GreenshotPlugin.Core {
	public static class EnumerationExtensions {
		public static bool Has<T>(this Enum type, T value) {
			Type underlyingType = Enum.GetUnderlyingType(value.GetType());
			try {
				if (underlyingType == typeof(int)) {
					return (((int)(object)type & (int)(object)value) == (int)(object)value);
				} else if (underlyingType == typeof(uint)) {
					return (((uint)(object)type & (uint)(object)value) == (uint)(object)value);
				}
			}
			catch
			{
				// ignored
			}
			return false;
		}

		public static bool Is<T>(this Enum type, T value) {
			Type underlyingType = Enum.GetUnderlyingType(value.GetType());
			try
			{
				if (underlyingType == typeof(int)) {
					return (int)(object)type == (int)(object)value;
				}
				if (underlyingType == typeof(uint)) {
					return (uint)(object)type == (uint)(object)value;
				}
			}
			catch
			{
				// ignored
			}
			return false;
		}

		/// <summary>
		/// Add a flag to an enum
		/// </summary>
		/// <param name="type"></param>
		/// <param name="value"></param>
		/// <returns></returns>
		public static T Add<T>(this Enum type, T value) {
			Type underlyingType = Enum.GetUnderlyingType(value.GetType());
			try
			{
				if (underlyingType == typeof(int)) {
					return (T)(object)(((int)(object)type | (int)(object)value));
				}
				if (underlyingType == typeof(uint)) {
					return (T)(object)(((uint)(object)type | (uint)(object)value));
				}
			} catch(Exception ex) {
				throw new ArgumentException($"Could not append value '{value}' to enumerated type '{typeof(T).Name}'.", ex);
			}    
			throw new ArgumentException($"Could not append value '{value}' to enumerated type '{typeof(T).Name}'.");
		}

		/// <summary>
		/// Remove a flag from an enum type
		/// </summary>
		/// <param name="type"></param>
		/// <param name="value"></param>
		/// <returns></returns>
		public static T Remove<T>(this Enum type, T value) {
			Type underlyingType = Enum.GetUnderlyingType(value.GetType());
			try
			{
				if (underlyingType == typeof(int)) {
					return (T)(object)(((int)(object)type & ~(int)(object)value));
				}
				if (underlyingType == typeof(uint)) {
					return (T)(object)(((uint)(object)type & ~(uint)(object)value));
				}
			} catch(Exception ex) {
				throw new ArgumentException($"Could not remove value '{value}' from enumerated type '{typeof(T).Name}'.", ex);
			}    
			throw new ArgumentException($"Could not remove value '{value}' from enumerated type '{typeof(T).Name}'.");
		}
	}
}