// 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.CSharp.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.UseExpressionBodyForLambda;
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 sealed class UseExpressionBodyForLambdasRefactoringTests : AbstractCSharpCodeActionTest_NoEditor
{
    protected override CodeRefactoringProvider CreateCodeRefactoringProvider(TestWorkspace workspace, TestParameters parameters)
        => new UseExpressionBodyForLambdaCodeRefactoringProvider();
 
    private OptionsCollection UseExpressionBody
        => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedLambdas, CSharpCodeStyleOptions.WhenPossibleWithSuggestionEnforcement);
 
    private OptionsCollection UseExpressionBodyDisabledDiagnostic
        => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedLambdas, CSharpCodeStyleOptions.WhenPossibleWithSilentEnforcement);
 
    private OptionsCollection UseBlockBody
        => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedLambdas, CSharpCodeStyleOptions.NeverWithSuggestionEnforcement);
 
    private OptionsCollection UseBlockBodyDisabledDiagnostic
        => this.Option(CSharpCodeStyleOptions.PreferExpressionBodiedLambdas, CSharpCodeStyleOptions.NeverWithSilentEnforcement);
 
    [Fact]
    public async Task TestNotOfferedIfUserPrefersExpressionBodiesAndInBlockBody()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [|=>|]
                    {
                        return x.ToString();
                    }
                }
            }
            """, parameters: new TestParameters(options: UseExpressionBody));
    }
 
    [Fact]
    public async Task TestOfferedIfUserPrefersExpressionBodiesWithoutDiagnosticAndInBlockBody()
    {
        await TestInRegularAndScript1Async(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [||]=>
                    {
                        return x.ToString();
                    };
                }
            }
            """,
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x => x.ToString();
                }
            }
            """, parameters: new TestParameters(options: UseExpressionBodyDisabledDiagnostic));
    }
 
    [Fact]
    public async Task TestOfferedIfUserPrefersBlockBodiesAndInBlockBody()
    {
        await TestInRegularAndScript1Async(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [||]=>
                    {
                        return x.ToString();
                    };
                }
            }
            """,
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x => x.ToString();
                }
            }
            """, parameters: new TestParameters(options: UseBlockBody));
    }
 
    [Fact]
    public async Task TestNotOfferedInMethod()
    {
        await TestMissingAsync(
            """
            class C
            {
                int [|Goo|]()
                {
                    return 1;
                }
            }
            """, parameters: new TestParameters(options: UseBlockBody));
    }
 
    [Fact]
    public async Task TestNotOfferedIfUserPrefersBlockBodiesAndInExpressionBody()
    {
        await TestMissingAsync(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [||]=> x.ToString();
                }
            }
            """, parameters: new TestParameters(options: UseBlockBody));
    }
 
    [Fact]
    public async Task TestOfferedIfUserPrefersBlockBodiesWithoutDiagnosticAndInExpressionBody()
    {
        await TestInRegularAndScript1Async(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [||]=> x.ToString();
                }
            }
            """,
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x =>
                    {
                        return x.ToString();
                    };
                }
            }
            """, parameters: new TestParameters(options: UseBlockBodyDisabledDiagnostic));
    }
 
    [Fact]
    public async Task TestOfferedIfUserPrefersExpressionBodiesAndInExpressionBody()
    {
        await TestInRegularAndScript1Async(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x [||]=> x.ToString();
                }
            }
            """,
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Func<int, string> f = x =>
                    {
                        return x.ToString();
                    };
                }
            }
            """, parameters: new TestParameters(options: UseExpressionBody));
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/74137")]
    public async Task TestNotWithPreprocessorDirectives()
    {
        await TestMissingAsync(
            """
            app.UseSwaggerUI(c [||]=>
            {
            #if DEBUG
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "API V1");
            #else
                c.SwaggerEndpoint("/api/swagger/v1/swagger.json", "API V1");
            #endif
            });
            """, parameters: new TestParameters(options: UseExpressionBodyDisabledDiagnostic));
    }
}