﻿// 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 $$");
        }
    }
}
