// 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.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.VisualStudio.Text.Editor;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.UnitTests.Formatting;
 
[UseExportProvider]
public class InferredIndentationTests
{
    [Fact]
    public async Task BlankFileMatchesWorkspaceSettings()
    {
        using var testWorkspace = CreateWithLines(
            "");
        var options = await testWorkspace.CurrentSolution.Projects.Single().Documents.Single().GetLineFormattingOptionsAsync(CancellationToken.None);
 
        Assert.Equal(FormattingOptions.UseTabs.DefaultValue, options.UseTabs);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/61109")]
    public async Task SingleLineWithTab()
    {
        using var testWorkspace = CreateWithLines(
            "class C",
            "{",
            "\tvoid M() { }",
            "}");
        var options = await testWorkspace.CurrentSolution.Projects.Single().Documents.Single().GetLineFormattingOptionsAsync(CancellationToken.None);
 
        // the indentation is only inferred by a command handler:
        Assert.False(options.UseTabs);
    }
 
    [Fact]
    public async Task SingleLineWithFourSpaces()
    {
        using var testWorkspace = CreateWithLines(
            "class C",
            "{",
            "    void M() { }",
            "}");
        var options = await testWorkspace.CurrentSolution.Projects.Single().Documents.Single().GetLineFormattingOptionsAsync(CancellationToken.None);
 
        Assert.False(options.UseTabs);
        Assert.Equal(4, options.IndentationSize);
    }
 
    private static EditorTestWorkspace CreateWithLines(params string[] lines)
    {
        var workspace = EditorTestWorkspace.CreateCSharp(string.Join("\r\n", lines), openDocuments: true);
        var editorOptionsFactoryService = workspace.ExportProvider.GetExportedValue<IEditorOptionsFactoryService>();
 
        editorOptionsFactoryService.GlobalOptions.SetOptionValue(DefaultOptions.AdaptiveFormattingOptionId, true);
 
        return workspace;
    }
}