// 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_NoEditor
{
    protected override CodeRefactoringProvider CreateCodeRefactoringProvider(TestWorkspace 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));
    }
 
    [Fact]
    public async Task TestOfferedWithSelectionInsideBlockBody()
    {
        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 TestNotOfferedWithSelectionOutsideBlockBody()
    {
        await TestMissingAsync(
            """
            class C
            {
                int this[int i]
                {
                    get
                    {
                        [|return Bar();
                    }
                }
            }|]
            """,
            parameters: new TestParameters(options: UseBlockBody));
    }
}