// 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 PrivateKeywordRecommenderTests : KeywordRecommenderTests
{
    [Fact]
    public async Task TestAtRoot_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
@"$$");
    }
 
    [Fact]
    public async Task TestAfterClass_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
            """
            class C { }
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterGlobalStatement_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
            """
            System.Console.WriteLine();
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterGlobalVariableDeclaration_Interactive()
    {
        await VerifyKeywordAsync(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(SourceCodeKind.Regular, @"$$");
 
    [Fact]
    public async Task TestNotAfterExtern()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            extern alias Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterExtern_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script, """
            extern alias Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterUsing()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterUsing_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script, """
            using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalUsing()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            global using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterGlobalUsing_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script, """
            global using Goo;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNamespace()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            namespace N {}
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterFileScopedNamespace()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular,
            """
            namespace N;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterTypeDeclaration()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            class C {}
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterDelegateDeclaration()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            delegate void Goo();
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterMethod()
    {
        await VerifyKeywordAsync(
            """
            class C {
              void Goo() {}
              $$
            """);
    }
 
    [Fact]
    public async Task TestAfterField()
    {
        await VerifyKeywordAsync(
            """
            class C {
              int i;
              $$
            """);
    }
 
    [Fact]
    public async Task TestAfterProperty()
    {
        await VerifyKeywordAsync(
            """
            class C {
              int i { get; }
              $$
            """);
    }
 
    [Fact]
    public async Task TestNotBeforeUsing()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            $$
            using Goo;
            """);
    }
 
    [Fact(Skip = "https://github.com/dotnet/roslyn/issues/9880")]
    public async Task TestNotBeforeUsing_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script, """
            $$
            using Goo;
            """);
    }
 
    [Fact]
    public async Task TestNotBeforeGlobalUsing()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular,
            """
            $$
            global using Goo;
            """);
    }
 
    [Fact(Skip = "https://github.com/dotnet/roslyn/issues/9880")]
    public async Task TestNotBeforeGlobalUsing_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            $$
            global using Goo;
            """);
    }
 
    [Fact]
    public async Task TestNotAfterAssemblyAttribute()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            [assembly: goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterAssemblyAttribute_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script, """
            [assembly: goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterRootAttribute()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Regular, """
            [goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterRootAttribute_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script, """
            [goo]
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterNestedAttribute()
    {
        await VerifyKeywordAsync(
            """
            class C {
              [goo]
              $$
            """);
    }
 
    [Fact]
    public async Task TestInsideStruct()
    {
        await VerifyKeywordAsync(
            """
            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 $$");
 
    // You can have an abstract private class.
    [Fact]
    public async Task TestAfterNestedAbstract()
    {
        await VerifyKeywordAsync(
            """
            class C {
                abstract $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterInternal()
        => await VerifyAbsenceAsync(@"internal $$");
 
    [Fact]
    public async Task TestNotAfterPublic()
        => await VerifyAbsenceAsync(@"public $$");
 
    [Fact]
    public async Task TestNotAfterStaticPrivate()
        => 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 TestNotAfterProtected()
        => await VerifyAbsenceAsync(@"protected $$");
 
    [Fact]
    public async Task TestNotAfterSealed()
        => await VerifyAbsenceAsync(@"sealed $$");
 
    // You can have a 'sealed private class'.
    [Fact]
    public async Task TestAfterNestedSealed()
    {
        await VerifyKeywordAsync(
            """
            class C {
                sealed $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterStatic()
        => await VerifyAbsenceAsync(SourceCodeKind.Regular, @"static $$");
 
    [Fact]
    public async Task TestAfterStatic_Interactive()
        => await VerifyKeywordAsync(SourceCodeKind.Script, @"static $$");
 
    [Fact]
    public async Task TestAfterNestedStatic()
    {
        await VerifyKeywordAsync(
            """
            class C {
                static $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterDelegate()
        => await VerifyAbsenceAsync(@"delegate $$");
 
    [Fact]
    public async Task TestNotAfterNestedVirtual()
    {
        await VerifyAbsenceAsync("""
            class C {
                virtual $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterNestedOverride()
    {
        await VerifyAbsenceAsync("""
            class C {
                override $$
            """);
    }
 
    [Fact]
    public async Task TestInProperty()
    {
        await VerifyKeywordAsync(
            """
            class C {
                int Goo { $$
            """);
    }
 
    [Fact]
    public async Task TestInPropertyAfterAccessor()
    {
        await VerifyKeywordAsync(
            """
            class C {
                int Goo { get; $$
            """);
    }
 
    [Fact]
    public async Task TestNotInPropertyAfterAccessibility()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int Goo { get; private $$
            """);
    }
 
    [Fact]
    public async Task TestAfterRegion()
    {
        await VerifyKeywordAsync(
            """
            class C {
            #region Interop stuff
                $$
            """);
    }
 
    [Fact]
    public async Task TestAfterTypeWithSemicolon()
    {
        await VerifyKeywordAsync(
            """
            class C {
                private enum PageAccess : int { PAGE_READONLY = 0x02 };
                $$
            """);
    }
 
    [Fact]
    public async Task TestInIndexer()
    {
        await VerifyKeywordAsync(
            """
            class C {
                int this[int i] { $$
            """);
    }
 
    [Fact]
    public async Task TestInIndexerAfterAccessor()
    {
        await VerifyKeywordAsync(
            """
            class C {
                int this[int i] { get { } $$
            """);
    }
 
    [Fact]
    public async Task TestNotInIndexerAfterPrivateAccessibility()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int this[int i] { get { } private $$
            """);
    }
 
    [Fact]
    public async Task TestNotInIndexerAfterProtectedAccessibility()
    {
        await VerifyKeywordAsync(
            """
            class C {
                int this[int i] { get { } protected $$
            """);
    }
 
    [Fact]
    public async Task TestNotInIndexerAfterInternalAccessibility()
    {
        await VerifyAbsenceAsync(
            """
            class C {
                int this[int i] { get { } internal $$
            """);
    }
 
    [Fact]
    public async Task TestWithinExtension()
    {
        await VerifyKeywordAsync(
            """
            static class C
            {
                extension(string s)
                {
                    $$
                }
            }
            """,
            CSharpNextParseOptions,
            CSharpNextScriptParseOptions);
    }
}