/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2016 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.Collections.Generic;
using System.Windows.Forms;
using Greenshot.IniFile;
using Greenshot.Plugin;
using System;
using System.Threading.Tasks;
using Dapplo.Log;
using Greenshot.Forms;
using Greenshot.Helpers;
using GreenshotJiraPlugin.Forms;
using GreenshotPlugin.Core;
using log4net;

namespace GreenshotJiraPlugin {
	/// <summary>
	/// This is the JiraPlugin base code
	/// </summary>
	public class JiraPlugin : IGreenshotPlugin {
		private static readonly ILog Log = LogManager.GetLogger(typeof(JiraPlugin));
		private JiraConfiguration _config;
		private static JiraPlugin _instance;
		private JiraConnector _jiraConnector;

		public void Dispose() {
			Dispose(true);
			GC.SuppressFinalize(this);
		}

		protected void Dispose(bool disposing) {
			if (disposing) {
				if (JiraConnector != null) {
					JiraConnector.Dispose();
					JiraConnector = null;
				}
			}
		}

		public static JiraPlugin Instance => _instance;

		public JiraPlugin() {
			_instance = this;
			// Added to prevent Greenshot from shutting down when there was an exception in a Task
			TaskScheduler.UnobservedTaskException += (sender, args) =>
			{
				try
				{
					Exception exceptionToLog = args.Exception;
					string exceptionText = EnvironmentInfo.BuildReport(exceptionToLog);
					Log.Error("Exception caught in the UnobservedTaskException handler.");
					Log.Error(exceptionText);
					new BugReportForm(exceptionText).ShowDialog();
				}
				finally 
				{
					args.SetObserved();
				}
			};
		}

		public IEnumerable<IDestination> Destinations() {
			yield return new JiraDestination(this);
		}

		public IEnumerable<IProcessor> Processors() {
			yield break;
		}

		//Needed for a fail-fast
		public JiraConnector CurrentJiraConnector => JiraConnector;

		public JiraConnector JiraConnector
		{
			get
			{
				lock (_instance)
				{
					if (_jiraConnector == null)
					{
						JiraConnector = new JiraConnector();
					}
				}
				return _jiraConnector;
			}
			private set { _jiraConnector = value; }
		}

		/// <summary>
		/// Implementation of the IGreenshotPlugin.Initialize
		/// </summary>
		/// <param name="pluginHost">Use the IGreenshotPluginHost interface to register events</param>
		/// <param name="myAttributes">My own attributes</param>
		/// <returns>true if plugin is initialized, false if not (doesn't show)</returns>
		public bool Initialize(IGreenshotHost pluginHost, PluginAttribute myAttributes) {
			// Register configuration (don't need the configuration itself)
			_config = IniConfig.GetIniSection<JiraConfiguration>();

			// Make sure the loggin is enable for the corect level.
			if (Log.IsDebugEnabled)
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Verbose);
			}
			else if (Log.IsInfoEnabled)
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Info);
			}
			else if (Log.IsWarnEnabled)
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Warn);
			}
			else if (Log.IsErrorEnabled)
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Error);
			}
			else if (Log.IsErrorEnabled)
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Error);
			}
			else
			{
				LogSettings.RegisterDefaultLogger<Log4NetLogger>(LogLevels.Fatal);
			}

			// Add a SVG converter, although it doesn't fit to the Jira plugin there is currently no other way
			ImageHelper.StreamConverters["svg"] = (stream, s) =>
			{
				stream.Position = 0;
				try
				{
					return SvgImage.FromStream(stream).Image;
				}
				catch (Exception ex)
				{
					Log.Error("Can't load SVG", ex);
				}
				return null;
			};

			return true;
		}

		public void Shutdown() {
			Log.Debug("Jira Plugin shutdown.");
			if (JiraConnector != null)
			{
				Task.Run(async () => await JiraConnector.LogoutAsync());
			}
		}

		/// <summary>
		/// Implementation of the IPlugin.Configure
		/// </summary>
		public void Configure() {
			string url = _config.Url;
			if (ShowConfigDialog()) {
				// check for re-login
				if (JiraConnector != null && JiraConnector.IsLoggedIn && !string.IsNullOrEmpty(url)) {
					if (!url.Equals(_config.Url)) {
						Task.Run(async () =>
						{
							await JiraConnector.LogoutAsync();
							await JiraConnector.LoginAsync();
						});
					}
				}
			}
		}

		/// <summary>
		/// A form for username/password
		/// </summary>
		/// <returns>bool true if OK was pressed, false if cancel</returns>
		private bool ShowConfigDialog()
		{
			var settingsForm = new SettingsForm();
			var result = settingsForm.ShowDialog();
			if (result == DialogResult.OK)
			{
				return true;
			}
			return false;
		}
	}
}