// 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.CSharp.Formatting;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.VisualStudio.Composition;
using Microsoft.VisualStudio.LanguageServices.CSharp.Options.Formatting;
using Microsoft.VisualStudio.LanguageServices.Implementation.Options;
using Microsoft.VisualStudio.LanguageServices.UnitTests;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Roslyn.VisualStudio.CSharp.UnitTests.Options;
 
[UseExportProvider]
[Trait(Traits.Feature, Traits.Features.Options)]
public sealed class OptionViewModelTests
{
    private sealed class MockServiceProvider : IServiceProvider
    {
        private readonly MockComponentModel _componentModel;
 
        public MockServiceProvider(ExportProvider exportProvider)
        {
            _componentModel = new MockComponentModel(exportProvider);
        }
 
        public object GetService(Type serviceType)
        {
            return _componentModel;
        }
    }
 
    private static string GetText(AbstractOptionPreviewViewModel viewModel)
    {
        return viewModel.TextViewHost.TextView.TextBuffer.CurrentSnapshot.GetText().ToString();
    }
 
    public OptionViewModelTests()
    {
        WpfTestRunner.RequireWpfFact("Tests create WPF ViewModels and updates previews with them");
    }
 
    [WpfFact]
    public void TestCheckBox()
    {
        using var workspace = EditorTestWorkspace.CreateCSharp("");
        var serviceProvider = new MockServiceProvider(workspace.ExportProvider);
        var optionStore = new OptionStore(workspace.GlobalOptions);
        using var viewModel = new SpacingViewModel(optionStore, serviceProvider);
        // Use the first item's preview.
        var checkbox = viewModel.Items.OfType<CheckBoxOptionViewModel>().First();
        viewModel.SetOptionAndUpdatePreview(checkbox.IsChecked, checkbox.Option, checkbox.GetPreview());
 
        // Get a checkbox and toggle it
        var originalPreview = GetText(viewModel);
 
        checkbox.IsChecked = !checkbox.IsChecked;
        var modifiedPreview = GetText(viewModel);
        Assert.NotEqual(modifiedPreview, originalPreview);
 
        // Switch it back
        checkbox.IsChecked = !checkbox.IsChecked;
        Assert.Equal(originalPreview, viewModel.TextViewHost.TextView.TextBuffer.CurrentSnapshot.GetText().ToString());
    }
 
    [WpfFact]
    public void TestOptionLoading()
    {
        using var workspace = EditorTestWorkspace.CreateCSharp("");
        var optionStore = new OptionStore(workspace.GlobalOptions);
        workspace.GlobalOptions.SetGlobalOption(CSharpFormattingOptions2.SpacingAfterMethodDeclarationName, true);
 
        var serviceProvider = new MockServiceProvider(workspace.ExportProvider);
        using var viewModel = new SpacingViewModel(optionStore, serviceProvider);
        // Use the first item's preview.
        var checkbox = viewModel.Items.OfType<CheckBoxOptionViewModel>().Where(c => c.Option == CSharpFormattingOptions2.SpacingAfterMethodDeclarationName).First();
        Assert.True(checkbox.IsChecked);
    }
 
    [WpfFact]
    public void TestOptionSaving()
    {
        using var workspace = EditorTestWorkspace.CreateCSharp("");
        var serviceProvider = new MockServiceProvider(workspace.ExportProvider);
        var optionStore = new OptionStore(workspace.GlobalOptions);
        using var viewModel = new SpacingViewModel(optionStore, serviceProvider);
        // Use the first item's preview.
        var checkbox = viewModel.Items.OfType<CheckBoxOptionViewModel>().Where(c => c.Option == CSharpFormattingOptions2.SpacingAfterMethodDeclarationName).First();
        var initial = checkbox.IsChecked;
        checkbox.IsChecked = !checkbox.IsChecked;
 
        Assert.NotEqual(optionStore.GetOption(CSharpFormattingOptions2.SpacingAfterMethodDeclarationName), initial);
    }
}