// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
#nullable disable
 
using System;
using System.Linq;
using Microsoft.CodeAnalysis.Editor.UnitTests.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.VisualStudio.Commanding;
using Microsoft.VisualStudio.Text;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Text.Editor.Commanding.Commands;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.UnitTests.DocumentationComments;
 
[UseExportProvider]
public abstract class AbstractXmlTagCompletionTests
{
    private protected abstract IChainedCommandHandler<TypeCharCommandArgs> CreateCommandHandler(EditorTestWorkspace testWorkspace);
    private protected abstract EditorTestWorkspace CreateTestWorkspace(string initialMarkup);
 
    public void Verify(string initialMarkup, string expectedMarkup, char typeChar)
    {
        using var workspace = CreateTestWorkspace(initialMarkup);
 
        var testDocument = workspace.Documents.Single();
        var view = testDocument.GetTextView();
        view.Caret.MoveTo(new SnapshotPoint(view.TextSnapshot, testDocument.CursorPosition.Value));
 
        var commandHandler = CreateCommandHandler(workspace);
 
        var args = new TypeCharCommandArgs(view, view.TextBuffer, typeChar);
        var nextHandler = CreateInsertTextHandler(view, typeChar.ToString());
 
        commandHandler.ExecuteCommand(args, nextHandler, TestCommandExecutionContext.Create());
        MarkupTestFile.GetPosition(expectedMarkup, out var expectedCode, out int expectedPosition);
 
        Assert.Equal(expectedCode, view.TextSnapshot.GetText());
 
        var caretPosition = view.Caret.Position.BufferPosition.Position;
        Assert.True(expectedPosition == caretPosition,
            string.Format("Caret positioned incorrectly. Should have been {0}, but was {1}.", expectedPosition, caretPosition));
    }
 
    private static Action CreateInsertTextHandler(ITextView textView, string text)
    {
        return () =>
        {
            var caretPosition = textView.Caret.Position.BufferPosition;
            var newSpanshot = textView.TextBuffer.Insert(caretPosition, text);
            textView.Caret.MoveTo(new SnapshotPoint(newSpanshot, caretPosition + text.Length));
        };
    }
}