/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2015 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;
using System.Collections.Generic;

using Greenshot.Plugin;
using GreenshotPlugin.Core;
using Greenshot.IniFile;
using log4net;

namespace Greenshot.Helpers {
	/// <summary>
	/// Description of DestinationHelper.
	/// </summary>
	public static class DestinationHelper {
		private static readonly ILog LOG = LogManager.GetLogger(typeof(DestinationHelper));
		private static readonly Dictionary<string, IDestination> RegisteredDestinations = new Dictionary<string, IDestination>();
		private static readonly CoreConfiguration coreConfig = IniConfig.GetIniSection<CoreConfiguration>();

		/// Initialize the destinations		
		static DestinationHelper() {
			foreach(Type destinationType in InterfaceUtils.GetSubclassesOf(typeof(IDestination),true)) {
				// Only take our own
				if (!"Greenshot.Destinations".Equals(destinationType.Namespace)) {
					continue;
				}
				if (!destinationType.IsAbstract) {
					IDestination destination;
					try {
						destination = (IDestination)Activator.CreateInstance(destinationType);
					} catch (Exception e) {
						LOG.ErrorFormat("Can't create instance of {0}", destinationType);
						LOG.Error(e);
						continue;
					}
					if (destination.isActive) {
						LOG.DebugFormat("Found destination {0} with designation {1}", destinationType.Name, destination.Designation);
						RegisterDestination(destination);
					} else {
						LOG.DebugFormat("Ignoring destination {0} with designation {1}", destinationType.Name, destination.Designation);
					}
				}
			}
		}

		/// <summary>
		/// Register your destination here, if it doesn't come from a plugin and needs to be available
		/// </summary>
		/// <param name="destination"></param>
		public static void RegisterDestination(IDestination destination) {
			if (coreConfig.ExcludeDestinations == null || !coreConfig.ExcludeDestinations.Contains(destination.Designation)) {
				// don't test the key, an exception should happen wenn it's not unique
				RegisteredDestinations.Add(destination.Designation, destination);
			}
		}

		/// <summary>
		/// Method to get all the destinations from the plugins
		/// </summary>
		/// <returns>List<IDestination></returns>
		private static List<IDestination> GetPluginDestinations() {
			List<IDestination> destinations = new List<IDestination>();
			foreach (PluginAttribute pluginAttribute in PluginHelper.Instance.Plugins.Keys) {
				IGreenshotPlugin plugin = PluginHelper.Instance.Plugins[pluginAttribute];
				try {
					foreach (IDestination destination in plugin.Destinations()) {
						if (coreConfig.ExcludeDestinations == null || !coreConfig.ExcludeDestinations.Contains(destination.Designation)) {
							destinations.Add(destination);
						}
					}
				} catch (Exception ex) {
					LOG.ErrorFormat("Couldn't get destinations from the plugin {0}", pluginAttribute.Name);
					LOG.Error(ex);
				}
			}
			destinations.Sort();
			return destinations;
		}

		/// <summary>
		/// Get a list of all destinations, registered or supplied by a plugin
		/// </summary>
		/// <returns></returns>
		public static List<IDestination> GetAllDestinations() {
			List<IDestination> destinations = new List<IDestination>();
			destinations.AddRange(RegisteredDestinations.Values);
			destinations.AddRange(GetPluginDestinations());
			destinations.Sort();
			return destinations;
		}

		/// <summary>
		/// Get a destination by a designation
		/// </summary>
		/// <param name="designation">Designation of the destination</param>
		/// <returns>IDestination or null</returns>
		public static IDestination GetDestination(string designation) {
			if (designation == null) {
				return null;
			}
			if (RegisteredDestinations.ContainsKey(designation)) {
				return RegisteredDestinations[designation];
			}
			foreach (IDestination destination in GetPluginDestinations()) {
				if (designation.Equals(destination.Designation)) {
					return destination;
				}
			}
			return null;
		}

		/// <summary>
		/// A simple helper method which will call ExportCapture for the destination with the specified designation
		/// </summary>
		/// <param name="designation"></param>
		/// <param name="surface"></param>
		/// <param name="captureDetails"></param>
		public static ExportInformation ExportCapture(bool manuallyInitiated, string designation, ISurface surface, ICaptureDetails captureDetails) {
			IDestination destination = GetDestination(designation);
			if (destination != null && destination.isActive) {
				return destination.ExportCapture(manuallyInitiated, surface, captureDetails);
			}
			return null;
		}
	}
}