// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using dnlib.DotNet;
using dnSpy.Analyzer.Properties;
using dnSpy.Contracts.Decompiler;
using dnSpy.Contracts.Documents.TreeView;
using dnSpy.Contracts.Images;
using dnSpy.Contracts.Text;
using dnSpy.Contracts.TreeView;

namespace dnSpy.Analyzer.TreeNodes {
	sealed class EventNode : EntityNode {
		readonly EventDef analyzedEvent;
		readonly bool hidesParent;

		public EventNode(EventDef analyzedEvent, bool hidesParent = false) {
			this.analyzedEvent = analyzedEvent ?? throw new ArgumentNullException(nameof(analyzedEvent));
			this.hidesParent = hidesParent;
		}

		public override void Initialize() => TreeNode.LazyLoading = true;
		public override IMemberRef? Member => analyzedEvent;
		public override IMDTokenProvider? Reference => analyzedEvent;
		protected override ImageReference GetIcon(IDotNetImageService dnImgMgr) => dnImgMgr.GetImageReference(analyzedEvent);

		protected override void Write(ITextColorWriter output, IDecompiler decompiler) {
			if (hidesParent) {
				output.Write(BoxedTextColor.Punctuation, "(");
				output.Write(BoxedTextColor.Text, dnSpy_Analyzer_Resources.HidesParent);
				output.Write(BoxedTextColor.Punctuation, ")");
				output.WriteSpace();
			}
			decompiler.WriteType(output, analyzedEvent.DeclaringType, true);
			output.Write(BoxedTextColor.Operator, ".");
			new NodeFormatter().Write(output, decompiler, analyzedEvent, Context.ShowToken);
		}

		public override IEnumerable<TreeNodeData> CreateChildren() {
			if (analyzedEvent.AddMethod is not null)
				yield return new EventAccessorNode(analyzedEvent.AddMethod, "add");

			if (analyzedEvent.RemoveMethod is not null)
				yield return new EventAccessorNode(analyzedEvent.RemoveMethod, "remove");

			if (analyzedEvent.InvokeMethod is not null)
				yield return new EventAccessorNode(analyzedEvent.InvokeMethod, "raise");

			foreach (var accessor in analyzedEvent.OtherMethods)
				yield return new EventAccessorNode(accessor, null);

			if (EventFiredByNode.CanShow(analyzedEvent))
				yield return new EventFiredByNode(analyzedEvent);

			if (EventOverriddenNode.CanShow(analyzedEvent))
				yield return new EventOverriddenNode(analyzedEvent);

			if (EventOverridesNode.CanShow(analyzedEvent))
				yield return new EventOverridesNode(analyzedEvent);

			if (InterfaceEventImplementedByNode.CanShow(analyzedEvent))
				yield return new InterfaceEventImplementedByNode(analyzedEvent);
		}

		public static AnalyzerTreeNodeData? TryCreateAnalyzer(IMemberRef? member, IDecompiler decompiler) {
			if (CanShow(member, decompiler))
				return new EventNode((EventDef)member!);
			else
				return null;
		}

		public static bool CanShow(IMemberRef? member, IDecompiler decompiler) => member is EventDef;
	}
}