// 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.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations;
 
[Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
public sealed class VirtualKeywordRecommenderTests : KeywordRecommenderTests
{
    [Fact]
    public async Task TestNotAtRoot_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
@"$$");
    }
 
    [Fact]
    public async Task TestNotAfterClass_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            class C { }
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalStatement_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            System.Console.WriteLine();
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalVariableDeclaration_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            int i = 0;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotInUsingAlias()
    {
        await VerifyAbsenceAsync(
@"using Goo = $$");
    }
 
    [Fact]
    public async Task TestNotInGlobalUsingAlias()
    {
        await VerifyAbsenceAsync(
@"global using Goo = $$");
    }
 
    [Fact]
    public async Task TestNotInEmptyStatement()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"$$"));
    }
 
    [Fact]
    public async Task TestNotInCompilationUnit()
        => await VerifyAbsenceAsync(@"$$");
 
    [Fact]
    public async Task TestNotAfterExtern()
    {
        await VerifyAbsenceAsync("""
            extern alias Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterUsing()
    {
        await VerifyAbsenceAsync("""
            using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalUsing()
    {
        await VerifyAbsenceAsync("""
            global using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNamespace()
    {
        await VerifyAbsenceAsync("""
            namespace N {}
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterTypeDeclaration()
    {
        await VerifyAbsenceAsync("""
            class C {}
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterDelegateDeclaration()
    {
        await VerifyAbsenceAsync("""
            delegate void Goo();
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterMethodInClass()
    {
        await VerifyKeywordAsync(
            """
            class C {
              void Goo() {}
              $$
            """);
    }
 
    [Fact]
    public async Task TestAfterFieldInClass()
    {
        await VerifyKeywordAsync(
            """
            class C {
              int i;
              $$
            """);
    }
 
    [Fact]
    public async Task TestAfterPropertyInClass()
    {
        await VerifyKeywordAsync(
            """
            class C {
              int i { get; }
              $$
            """);
    }
 
    [Fact]
    public async Task TestNotBeforeUsing()
    {
        await VerifyAbsenceAsync(
            """
            $$
            using Goo;
            """);
    }
 
    [Fact]
    public async Task TestNotBeforeGlobalUsing()
    {
        await VerifyAbsenceAsync(
            """
            $$
            global using Goo;
            """);
    }
 
    [Fact]
    public async Task TestNotAfterAssemblyAttribute()
    {
        await VerifyAbsenceAsync("""
            [assembly: goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterRootAttribute()
    {
        await VerifyAbsenceAsync("""
            [goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterNestedAttribute()
    {
        await VerifyKeywordAsync(
            """
            class C {
              [goo]
              $$
            """);
    }
 
    [Fact]
    public async Task TestNotInsideStruct()
    {
        await VerifyAbsenceAsync("""
            struct S {
               $$
            """);
    }
 
    [Fact]
    public async Task TestInsideInterface()
    {
        await VerifyKeywordAsync("""
            interface I {
               $$
            """);
    }
 
    [Fact]
    public async Task TestInsideClass()
    {
        await VerifyKeywordAsync(
            """
            class C {
               $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterPartial()
        => await VerifyAbsenceAsync(@"partial $$");
 
    [Fact]
    public async Task TestNotAfterAbstract()
        => await VerifyAbsenceAsync(@"abstract $$");
 
    [Fact]
    public async Task TestNotAfterInternal()
        => await VerifyAbsenceAsync(@"internal $$");
 
    [Fact]
    public async Task TestNotAfterPublic()
        => await VerifyAbsenceAsync(@"public $$");
 
    [Fact]
    public async Task TestNotAfterStaticInternal()
        => await VerifyAbsenceAsync(@"static internal $$");
 
    [Fact]
    public async Task TestNotAfterInternalStatic()
        => await VerifyAbsenceAsync(@"internal static $$");
 
    [Fact]
    public async Task TestNotAfterInvalidInternal()
        => await VerifyAbsenceAsync(@"virtual internal $$");
 
    [Fact]
    public async Task TestNotAfterClass()
        => await VerifyAbsenceAsync(@"class $$");
 
    [Fact]
    public async Task TestNotAfterPrivate()
        => await VerifyAbsenceAsync(@"private $$");
 
    [Fact]
    public async Task TestNotAfterSealed()
        => await VerifyAbsenceAsync(@"sealed $$");
 
    [Fact]
    public async Task TestNotAfterStatic()
        => await VerifyAbsenceAsync(@"static $$");
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterNestedStatic([CombinatorialValues("class", "struct", "record", "record struct", "record class")] string declarationKind)
    {
        await VerifyAbsenceAsync(declarationKind + """
            C {
               static $$
            """);
    }
 
    [Fact]
    public async Task TestAfterNestedStaticInInterface()
    {
        await VerifyKeywordAsync("""
            interface C {
                static $$
            """);
    }
 
    [Fact]
    public async Task TestAfterNestedInternal()
    {
        await VerifyKeywordAsync(
            """
            class C {
                internal $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNestedPrivate()
    {
        await VerifyAbsenceAsync("""
            class C {
                private $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterDelegate()
        => await VerifyAbsenceAsync(@"delegate $$");
 
    [Fact]
    public async Task TestNotAfterNestedAbstract()
    {
        await VerifyAbsenceAsync("""
            class C {
                abstract $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNestedVirtual()
    {
        await VerifyAbsenceAsync("""
            class C {
                virtual $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNestedOverride()
    {
        await VerifyAbsenceAsync("""
            class C {
                override $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNestedSealed()
    {
        await VerifyAbsenceAsync("""
            class C {
                sealed $$
            """);
    }
 
    [Fact]
    public async Task TestNotInProperty()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int Goo { $$
            """);
    }
 
    [Fact]
    public async Task TestNotInPropertyAfterAccessor()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int Goo { get; $$
            """);
    }
 
    [Fact]
    public async Task TestNotInPropertyAfterAccessibility()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int Goo { get; protected $$
            """);
    }
 
    [Fact]
    public async Task TestNotInPropertyAfterInternal()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int Goo { get; internal $$
            """);
    }
 
    [Fact]
    public async Task TestAfterPrivateProtected()
    {
        await VerifyKeywordAsync(
            """
            class C {
                private protected $$
            """);
    }
 
    [Fact]
    public async Task TestWithinExtension()
    {
        await VerifyAbsenceAsync(
            """
            static class C
            {
                extension(string s)
                {
                    $$
                }
            }
            """, CSharpNextParseOptions);
    }
}