﻿// 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.

using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.VisualStudio.IntegrationTests;
using Xunit;

namespace Roslyn.VisualStudio.NewIntegrationTests.VisualBasic
{
    [Trait(Traits.Feature, Traits.Features.F1Help)]
    public class BasicF1Help : AbstractEditorTest
    {
        protected override string LanguageName => LanguageNames.VisualBasic;

        public BasicF1Help()
            : base(nameof(BasicF1Help))
        {
        }

        [IdeFact]
        private async Task F1Help()
        {
            var text = @"
Imports System
Imports System.Collections.Generic
Imports System.Linq

Module Program$$
    Sub Main(args As String())
        Dim query = From arg In args
                    Select args.Any(Function(a) a.Length > 5)
        Dim x = 0
        x += 1
    End Sub
    Public Function F() As Object
        Return Nothing
    End Function
End Module";

            await SetUpEditorAsync(text, HangMitigatingCancellationToken);
            await VerifyAsync("Linq", "System.Linq", HangMitigatingCancellationToken);
            await VerifyAsync("String", "vb.String", HangMitigatingCancellationToken);
            await VerifyAsync("Any", "System.Linq.Enumerable.Any", HangMitigatingCancellationToken);
            await VerifyAsync("From", "vb.QueryFrom", HangMitigatingCancellationToken);
            await VerifyAsync("+=", "vb.+=", HangMitigatingCancellationToken);
            await VerifyAsync("Nothing", "vb.Nothing", HangMitigatingCancellationToken);

        }

        private async Task VerifyAsync(string word, string expectedKeyword, CancellationToken cancellationToken)
        {
            await TestServices.Editor.PlaceCaretAsync(word, charsOffset: -1, cancellationToken);
            Assert.Contains(expectedKeyword, await TestServices.Editor.GetF1KeywordsAsync(cancellationToken));
        }
    }
}
