// 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.Collections.Immutable;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Structure;
using Microsoft.CodeAnalysis.Editor.UnitTests.Structure;
using Microsoft.CodeAnalysis.Shared.Extensions;
using Microsoft.CodeAnalysis.Structure;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Structure.MetadataAsSource;
 
/// <summary>
/// Identifiers coming from IL can be just about any valid string and since C# doesn't have a way to escape all
/// possible IL identifiers, we have to account for the possibility that an item's metadata name could lead to
/// unparseable code.
/// </summary>
[Trait(Traits.Feature, Traits.Features.MetadataAsSource)]
public class InvalidIdentifierStructureTests : AbstractSyntaxStructureProviderTests
{
    protected override string LanguageName => LanguageNames.CSharp;
    protected override string WorkspaceKind => CodeAnalysis.WorkspaceKind.MetadataAsSource;
 
    internal override async Task<ImmutableArray<BlockSpan>> GetBlockSpansWorkerAsync(Document document, BlockStructureOptions options, int position)
    {
        var outliningService = document.GetRequiredLanguageService<BlockStructureService>();
        return (await outliningService.GetBlockStructureAsync(document, options, CancellationToken.None)).Spans;
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1174405")]
    public async Task PrependedDollarSign()
    {
        var code = """
                {|hint:$$class C{|textspan:
                {
                    public void $Invoke();
                }|}|}
                """;
 
        await VerifyBlockSpansAsync(code,
            Region("textspan", "hint", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1174405")]
    public async Task SymbolsAndPunctuation()
    {
        var code = """
                {|hint:$$class C{|textspan:
                {
                    public void !#$%^&*(()_-+=|\}]{["':;?/>.<,~`();
                }|}|}
                """;
 
        await VerifyBlockSpansAsync(code,
            Region("textspan", "hint", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1174405")]
    public async Task IdentifierThatLooksLikeCode()
    {
        var code = """
                {|hint1:$$class C{|textspan1:
                {
                    public void }|}|} } {|hint2:public class CodeInjection{|textspan2:{ }|}|} {|textspan3:/* now everything is commented ();
                }|}
                """;
 
        await VerifyBlockSpansAsync(code,
            Region("textspan3", "/* now everything is commented (); ...", autoCollapse: true),
            Region("textspan2", "hint2", CSharpStructureHelpers.Ellipsis, autoCollapse: false),
            Region("textspan1", "hint1", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
    }
}