﻿// 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 Roslyn.Test.Utilities;
using Xunit;

namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations
{
    [Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
    public class InterfaceKeywordRecommenderTests : 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 TestInCompilationUnit()
        {
            await VerifyKeywordAsync(
@"$$");
        }

        [Fact]
        public async Task TestAfterExtern()
        {
            await VerifyKeywordAsync(
@"extern alias Goo;
$$");
        }

        [Fact]
        public async Task TestAfterUsing()
        {
            await VerifyKeywordAsync(
@"using Goo;
$$");
        }

        [Fact]
        public async Task TestAfterGlobalUsing()
        {
            await VerifyKeywordAsync(
@"global using Goo;
$$");
        }

        [Fact]
        public async Task TestAfterNamespace()
        {
            await VerifyKeywordAsync(
@"namespace N {}
$$");
        }

        [Fact]
        public async Task TestAfterFileScopedNamespace()
        {
            await VerifyKeywordAsync(
@"namespace N;
$$");
        }

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

        [Fact]
        public async Task TestAfterDelegateDeclaration()
        {
            await VerifyKeywordAsync(
@"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 TestAfterAssemblyAttribute()
        {
            await VerifyKeywordAsync(
@"[assembly: goo]
$$");
        }

        [Fact]
        public async Task TestAfterRootAttribute()
        {
            await VerifyKeywordAsync(
@"[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 TestAfterPartial()
        {
            await VerifyKeywordAsync(
@"partial $$");
        }

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

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

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

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

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

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

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

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

        [Fact]
        public async Task TestNotAfterInterface()
            => await VerifyAbsenceAsync(@"interface $$");
    }
}
