// 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 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 $$
                """);
        }
    }
}