From 28a6e95d2bff25242087f675a867eb067e264997 Mon Sep 17 00:00:00 2001
From: Matt Parker <61717342+MattParkerDev@users.noreply.github.com>
Date: Mon, 18 Aug 2025 19:56:25 +1000
Subject: [PATCH] display completions

---
 .../Features/Analysis/RoslynAnalysis.cs       | 28 +++++++++++++++++++
 src/SharpIDE.Godot/SharpIdeCodeEdit.cs        | 26 ++++++++++++++++-
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs b/src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs
index ea04a6f..573f973 100644
--- a/src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs
+++ b/src/SharpIDE.Application/Features/Analysis/RoslynAnalysis.cs
@@ -6,6 +6,7 @@ using Microsoft.CodeAnalysis.Classification;
 using Microsoft.CodeAnalysis.CodeActions;
 using Microsoft.CodeAnalysis.CodeFixes;
 using Microsoft.CodeAnalysis.CodeRefactorings;
+using Microsoft.CodeAnalysis.Completion;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Host.Mef;
 using Microsoft.CodeAnalysis.MSBuild;
@@ -162,6 +163,16 @@ public static class RoslynAnalysis
 		return result;
 	}
 
+	public static async Task<CompletionList> GetCodeCompletionsForDocumentAtPosition(SharpIdeFile fileModel, LinePosition linePosition)
+	{
+		await _solutionLoadedTcs.Task;
+		var project = _workspace!.CurrentSolution.Projects.Single(s => s.FilePath == ((IChildSharpIdeNode)fileModel).GetNearestProjectNode()!.FilePath);
+		var document = project.Documents.Single(s => s.FilePath == fileModel.Path);
+		Guard.Against.Null(document, nameof(document));
+		var completions = await GetCompletionsAsync(document, linePosition).ConfigureAwait(false);
+		return completions;
+	}
+
 	public static async Task<ImmutableArray<CodeAction>> GetCodeFixesForDocumentAtPosition(SharpIdeFile fileModel, LinePosition linePosition)
 	{
 		var cancellationToken = CancellationToken.None;
@@ -241,4 +252,21 @@ public static class RoslynAnalysis
 
 		return codeActions.ToImmutableArray();
 	}
+
+	private static async Task<CompletionList> GetCompletionsAsync(Document document, LinePosition linePosition)
+	{
+		var cancellationToken = CancellationToken.None;
+		var completionService = CompletionService.GetService(document);
+		if (completionService is null) throw new InvalidOperationException("Completion service is not available for the document.");
+
+		var sourceText = await document.GetTextAsync(cancellationToken);
+		var position = sourceText.Lines.GetPosition(linePosition);
+		var completions = await completionService.GetCompletionsAsync(document, position, cancellationToken: cancellationToken);
+
+		// foreach (var item in completions.ItemsList)
+		// {
+		// 	Console.WriteLine($"Completion: {item.DisplayText}");
+		// }
+		return completions;
+	}
 }
diff --git a/src/SharpIDE.Godot/SharpIdeCodeEdit.cs b/src/SharpIDE.Godot/SharpIdeCodeEdit.cs
index 62ae8dd..f684f8c 100644
--- a/src/SharpIDE.Godot/SharpIdeCodeEdit.cs
+++ b/src/SharpIDE.Godot/SharpIdeCodeEdit.cs
@@ -4,7 +4,6 @@ using System.Collections.Immutable;
 using System.IO;
 using System.Linq;
 using Godot;
-using Microsoft.Build.Utilities;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Classification;
 using Microsoft.CodeAnalysis.Text;
@@ -176,7 +175,32 @@ public partial class SharpIdeCodeEdit : CodeEdit
 	private void OnCodeCompletionRequested()
 	{
 		var (caretLine, caretColumn) = GetCaretPosition();
+		
 		GD.Print($"Code completion requested at line {caretLine}, column {caretColumn}");
+		_ = Task.Run(async () =>
+		{
+			try
+			{
+				var linePos = new LinePosition(caretLine, caretColumn);
+				
+				var completions = await RoslynAnalysis.GetCodeCompletionsForDocumentAtPosition(_currentFile, linePos);
+				Callable.From(() =>
+				{
+					foreach (var completionItem in completions.ItemsList)
+					{
+						AddCodeCompletionOption(CodeCompletionKind.Class, completionItem.DisplayText, completionItem.DisplayText);
+					}
+					// partially working - displays menu only when caret is what CodeEdit determines as valid
+					UpdateCodeCompletionOptions(true);
+					//RequestCodeCompletion(true);
+					GD.Print($"Found {completions.ItemsList.Count} completions, displaying menu");
+				}).CallDeferred();
+			}
+			catch (Exception ex)
+			{
+				GD.Print(ex);
+			}
+		});
 	}
 	
 	private (int, int) GetCaretPosition()