// 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.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Completion.Providers;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Completion.CompletionProviders;
 
[Trait(Traits.Feature, Traits.Features.Completion)]
public class ExternAliasCompletionProviderTests : AbstractCSharpCompletionProviderTests
{
    internal override Type GetCompletionProviderType()
        => typeof(ExternAliasCompletionProvider);
 
    [Fact]
    public async Task NoAliases()
    {
        await VerifyNoItemsExistAsync("""
            extern alias $$
            class C
            {
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/44423")]
    public async Task ExternAlias()
    {
        var markup = """
            extern alias $$
            """;
        await VerifyItemWithAliasedMetadataReferencesAsync(markup, "goo", "goo", 1, "C#", "C#");
    }
 
    [Fact]
    public async Task NotAfterExternAlias()
    {
        var markup = """
            extern alias goo $$
            """;
        await VerifyItemWithAliasedMetadataReferencesAsync(markup, "goo", "goo", 0, "C#", "C#");
    }
 
    [Fact]
    public async Task NotGlobal()
    {
        var markup = """
            extern alias $$
            """;
        await VerifyItemWithAliasedMetadataReferencesAsync(markup, "goo", "global", 0, "C#", "C#");
    }
 
    [Fact]
    public async Task NotIfAlreadyUsed()
    {
        var markup = """
            extern alias goo;
            extern alias $$
            """;
        await VerifyItemWithAliasedMetadataReferencesAsync(markup, "goo", "goo", 0, "C#", "C#");
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1075278")]
    public async Task NotInComment()
    {
        var markup = """
            extern alias // $$
            """;
        await VerifyNoItemsExistAsync(markup);
    }
}