// 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 TypeVarKeywordRecommenderTests : 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 TestNotInAttributeInsideClass()
        {
            await VerifyAbsenceAsync(
                """
                class C {
                    [$$
                """);
        }

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

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

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

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

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

        [Fact]
        public async Task TestInDelegateTypeParameters()
        {
            await VerifyKeywordAsync(
@"delegate void D<[$$");
        }

        [Fact]
        public async Task TestInMethodTypeParameters()
        {
            await VerifyKeywordAsync(
                """
                class C {
                    void M<[$$
                """);
        }

        [Fact]
        public async Task TestNotInInterface()
        {
            await VerifyAbsenceAsync(
                """
                interface I {
                    [$$
                """);
        }

        [Fact]
        public async Task TestNotInStruct()
        {
            await VerifyAbsenceAsync(
                """
                struct S {
                    [$$
                """);
        }

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