﻿// 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.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;

namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations
{
    [Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
    public class EventKeywordRecommenderTests : 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 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 TestAfterEvent()
        {
            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 TestInsideRecord()
        {
            // The recommender doesn't work in record in script
            // Tracked by https://github.com/dotnet/roslyn/issues/44865
            await VerifyWorkerAsync(
@"record C(int i, int j) {
   $$", absent: false, options: TestOptions.RegularPreview);
        }

        [Fact]
        public async Task TestNotAfterPartial()
            => await VerifyAbsenceAsync(@"partial $$");

        [Fact]
        public async Task TestNotAfterAbstract()
            => await VerifyAbsenceAsync(@"abstract $$");

        [Fact]
        public async Task TestNotAfterInternal()
            => await VerifyAbsenceAsync(SourceCodeKind.Regular, @"internal $$");

        [Fact]
        public async Task TestAfterInternal_Interactive()
            => await VerifyKeywordAsync(SourceCodeKind.Script, @"internal $$");

        [Fact]
        public async Task TestAfterNestedInternal()
        {
            await VerifyKeywordAsync(
@"class C {
    internal $$");
        }

        [Fact]
        public async Task TestNotAfterPublic()
            => await VerifyAbsenceAsync(SourceCodeKind.Regular, @"public $$");

        [Fact]
        public async Task TestAfterPublic_Interactive()
            => await VerifyKeywordAsync(SourceCodeKind.Script, @"public $$");

        [Fact]
        public async Task TestAfterNestedPublic()
        {
            await VerifyKeywordAsync(
@"class C {
    public $$");
        }

        [Fact]
        public async Task TestNotAfterPrivate()
        {
            await VerifyAbsenceAsync(SourceCodeKind.Regular,
@"private $$");
        }

        [Fact]
        public async Task TestAfterPrivate_Script()
        {
            await VerifyKeywordAsync(SourceCodeKind.Script,
@"private $$");
        }

        [Fact]
        public async Task TestAfterNestedPrivate()
        {
            await VerifyKeywordAsync(
@"class C {
    private $$");
        }

        [Fact]
        public async Task TestNotAfterProtected()
        {
            await VerifyAbsenceAsync(
@"protected $$");
        }

        [Fact]
        public async Task TestAfterNestedProtected()
        {
            await VerifyKeywordAsync(
@"class C {
    protected $$");
        }

        [Fact]
        public async Task TestNotAfterSealed()
            => await VerifyAbsenceAsync(@"sealed $$");

        [Fact]
        public async Task TestAfterNestedSealed()
        {
            await VerifyKeywordAsync(
@"class C {
    sealed $$");
        }

        [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/543975")]
        public async Task TestAfterUnsafe()
        {
            await VerifyKeywordAsync(
@"class C {
    unsafe $$");
        }

        [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 TestAfterStatic()
        {
            await VerifyKeywordAsync(
@"class C {
    static $$");
        }

        [Fact]
        public async Task TestNotAfterStaticPublic()
            => await VerifyAbsenceAsync(SourceCodeKind.Regular, @"static public $$");

        [Fact]
        public async Task TestAfterStaticPublic_Interactive()
            => await VerifyKeywordAsync(SourceCodeKind.Script, @"static public $$");

        [Fact]
        public async Task TestAfterNestedStaticPublic()
        {
            await VerifyKeywordAsync(
@"class C {
    static public $$");
        }

        [Fact]
        public async Task TestNotAfterDelegate()
            => await VerifyAbsenceAsync(@"delegate $$");

        [Fact]
        public async Task TestNotAfterEvent()
        {
            await VerifyAbsenceAsync(
@"class C {
    event $$");
        }

        [Fact]
        public async Task TestNotAfterNested()
        {
            await VerifyAbsenceAsync(
@"new $$");
        }

        [Fact]
        public async Task TestAfterNestedNew()
        {
            await VerifyKeywordAsync(
@"class C {
   new $$");
        }

        [Fact]
        public async Task TestInAttributeInsideClass()
        {
            await VerifyKeywordAsync(
@"class C {
    [$$");
        }

        [Fact]
        public async Task TestInAttributeAfterAttributeInsideClass()
        {
            await VerifyKeywordAsync(
@"class C {
    [Goo]
    [$$");
        }

        [Fact]
        public async Task TestInAttributeAfterMethod()
        {
            await VerifyKeywordAsync(
@"class C {
    void Goo() {
    }
    [$$");
        }

        [Fact]
        public async Task TestInAttributeAfterProperty()
        {
            await VerifyKeywordAsync(
@"class C {
    int Goo {
        get;
    }
    [$$");
        }

        [Fact]
        public async Task TestInAttributeAfterField()
        {
            await VerifyKeywordAsync(
@"class C {
    int Goo;
    [$$");
        }

        [Fact]
        public async Task TestInAttributeAfterEvent()
        {
            await VerifyKeywordAsync(
@"class C {
    event Action<int> Goo;
    [$$");
        }

        [Fact]
        public async Task TestNotInOuterAttribute()
        {
            await VerifyAbsenceAsync(
@"[$$");
        }

        [Fact]
        public async Task TestNotInParameterAttribute()
        {
            await VerifyAbsenceAsync(
@"class C {
    void Goo([$$");
        }

        [Fact]
        public async Task TestNotInPropertyAttribute()
        {
            await VerifyAbsenceAsync(
@"class C {
    int Goo { [$$");
        }

        [Fact]
        public async Task TestNotInEventAttribute()
        {
            await VerifyAbsenceAsync(
@"class C {
    event Action<int> Goo { [$$");
        }

        [Fact]
        public async Task TestNotInTypeParameters()
        {
            await VerifyAbsenceAsync(
@"class C<[$$");
        }

        [Fact]
        public async Task TestInInterface()
        {
            await VerifyKeywordAsync(
@"interface I {
    [$$");
        }

        [Fact]
        public async Task TestInStruct()
        {
            await VerifyKeywordAsync(
@"struct S {
    [$$");
        }

        [Fact]
        public async Task TestNotInEnum()
        {
            await VerifyAbsenceAsync(
@"enum E {
    [$$");
        }
    }
}
