// 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.
 
#nullable disable
 
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.UseExpressionBody;
using Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.CodeRefactorings;
using Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.UseExpressionBody
{
    [Trait(Traits.Feature, Traits.Features.CodeActionsUseExpressionBody)]
    public class UseExpressionBodyForIndexersRefactoringTests : AbstractCSharpCodeActionTest
    {
        protected override CodeRefactoringProvider CreateCodeRefactoringProvider(Workspace workspace, TestParameters parameters)
            => new UseExpressionBodyCodeRefactoringProvider();
 
        private OptionsCollection UseExpressionBody
            => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedIndexers, CSharpCodeStyleOptions.WhenPossibleWithSilentEnforcement);
 
        private OptionsCollection UseExpressionBodyDisabledDiagnostic
            => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedIndexers, new CodeStyleOption2<ExpressionBodyPreference>(ExpressionBodyPreference.WhenPossible, NotificationOption2.None));
 
        private OptionsCollection UseBlockBody
            => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedIndexers, CSharpCodeStyleOptions.NeverWithSilentEnforcement);
 
        private OptionsCollection UseBlockBodyDisabledDiagnostic
            => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedIndexers, new CodeStyleOption2<ExpressionBodyPreference>(ExpressionBodyPreference.Never, NotificationOption2.None));
 
        [Fact]
        public async Task TestNotOfferedIfUserPrefersExpressionBodiesAndInBlockBody()
        {
            await TestMissingAsync(
@"class C
{
    int this[int i]
    {
        get 
        {
            [||]return Bar();
        }
    }
}", parameters: new TestParameters(options: UseExpressionBody));
        }
 
        [Fact]
        public async Task TestOfferedIfUserPrefersExpressionBodiesWithoutDiagnosticAndInBlockBody()
        {
            await TestInRegularAndScript1Async(
@"class C
{
    int this[int i]
    {
        get
        {
            [||]return Bar();
        }
    }
}",
@"class C
{
    int this[int i] => Bar();
}", parameters: new TestParameters(options: UseExpressionBodyDisabledDiagnostic));
        }
 
        [Fact]
        public async Task TestOfferedIfUserPrefersBlockBodiesAndInBlockBody()
        {
            await TestInRegularAndScript1Async(
@"class C
{
    int this[int i]
    {
        get
        {
            [||]return Bar();
        }
    }
}",
@"class C
{
    int this[int i] => Bar();
}", parameters: new TestParameters(options: UseBlockBody));
        }
 
        [Fact]
        public async Task TestNotOfferedInLambda()
        {
            await TestMissingAsync(
@"class C
{
    Action Goo[int i]
    {
        get 
        {
            return () => { [||] };
        }
    }
}", parameters: new TestParameters(options: UseBlockBody));
        }
 
        [Fact]
        public async Task TestNotOfferedIfUserPrefersBlockBodiesAndInExpressionBody()
        {
            await TestMissingAsync(
@"class C
{
    int this[int i] => [||]Bar();
}", parameters: new TestParameters(options: UseBlockBody));
        }
 
        [Fact]
        public async Task TestOfferedIfUserPrefersBlockBodiesWithoutDiagnosticAndInExpressionBody()
        {
            await TestInRegularAndScript1Async(
@"class C
{
    int this[int i] => [||]Bar();
}",
@"class C
{
    int this[int i]
    {
        get
        {
            return Bar();
        }
    }
}", parameters: new TestParameters(options: UseBlockBodyDisabledDiagnostic));
        }
 
        [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/20363")]
        public async Task TestOfferedIfUserPrefersExpressionBodiesAndInExpressionBody()
        {
            await TestInRegularAndScript1Async(
@"class C
{
    int this[int i] => [||]Bar();
}",
@"class C
{
    int this[int i]
    {
        get
        {
            return Bar();
        }
    }
}", parameters: new TestParameters(options: UseExpressionBody));
        }
    }
}