using System;
using MBS.Framework;
using MBS.Framework.UserInterface;

namespace UniversalEditor.UserInterface
{
	public class EditorApplication : UIApplication, IHostApplication
	{
		/// <summary>
		/// Gets or sets the current window of the host application.
		/// </summary>
		public IHostApplicationWindow CurrentWindow { get { return UniversalEditor.UserInterface.Engine.CurrentEngine.LastWindow; } set { UniversalEditor.UserInterface.Engine.CurrentEngine.LastWindow = value; } }
		/// <summary>
		/// Gets or sets the output window of the host application, where other plugins can read from and write to.
		/// </summary>
		public HostApplicationOutputWindow OutputWindow { get; set; } = new HostApplicationOutputWindow();
		/// <summary>
		/// A collection of messages to display in the Error List panel.
		/// </summary>
		public HostApplicationMessage.HostApplicationMessageCollection Messages { get; } = new HostApplicationMessage.HostApplicationMessageCollection();

		public event EventHandler<EditorChangingEventArgs> EditorChanging;
		protected internal virtual void OnEditorChanging(EditorChangingEventArgs e)
		{
			EditorChanging?.Invoke(this, e);
		}
		public event EventHandler<EditorChangedEventArgs> EditorChanged;
		protected internal virtual void OnEditorChanged(EditorChangedEventArgs e)
		{
			EditorChanged?.Invoke(this, e);
		}

		protected override Command FindCommandInternal(string commandID)
		{
			if (!Common.Reflection.Initialized)
			{
				// hack around an infinite loop we inadvertently created
				return base.FindCommandInternal(commandID);
			}

			EditorReference[] editors = Common.Reflection.GetAvailableEditors();
			foreach (EditorReference er in editors)
			{
				Command cmd = er.Commands[commandID];
				if (cmd != null) return cmd;
			}
			return base.FindCommandInternal(commandID);
		}
		protected override Context FindContextInternal(Guid contextID)
		{
			EditorReference[] editors = Common.Reflection.GetAvailableEditors();
			foreach (EditorReference er in editors)
			{
				Context ctx = er.Contexts[contextID];
				if (ctx != null) return ctx;
			}
			return base.FindContextInternal(contextID);
		}
	}
}