// 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.CSharp.UnitTests.Snippets;
 
[Trait(Traits.Feature, Traits.Features.Snippets)]
public sealed class CSharpUsingSnippetProviderTests : AbstractCSharpSnippetProviderTests
{
    protected override string SnippetIdentifier => "using";
 
    [Fact]
    public async Task InsertUsingSnippetInMethodTest()
    {
        await VerifySnippetAsync("""
            class Program
            {
                public void Method()
                {
                    $$
                }
            }
            """, """
            class Program
            {
                public void Method()
                {
                    using ({|0:resource|})
                    {
                        $$
                    }
                }
            }
            """);
    }
 
    [Fact]
    public async Task InsertUsingSnippetInGlobalContextTest()
    {
        await VerifySnippetAsync("""
            $$
            """, """
            using ({|0:resource|})
            {
                $$
            }
            """);
    }
 
    [Fact]
    public async Task NoUsingSnippetInBusingNamespaceTest()
    {
        await VerifySnippetIsAbsentAsync("""
            namespace Namespace
            {
                $$
            }
            """);
    }
 
    [Fact]
    public async Task NoUsingSnippetInFileScopedNamespaceTest()
    {
        await VerifySnippetIsAbsentAsync("""
            namespace Namespace;
            $$
            """);
    }
 
    [Fact]
    public async Task InsertUsingSnippetInConstructorTest()
    {
        await VerifySnippetAsync("""
            class Program
            {
                public Program()
                {
                    $$
                }
            }
            """, """
            class Program
            {
                public Program()
                {
                    using ({|0:resource|})
                    {
                        $$
                    }
                }
            }
            """);
    }
 
    [Fact]
    public async Task NoUsingSnippetInTypeBodyTest()
    {
        await VerifySnippetIsAbsentAsync("""
            class Program
            {
                $$
            }
            """);
    }
 
    [Fact]
    public async Task InsertUsingSnippetInLocalFunctionTest()
    {
        await VerifySnippetAsync("""
            class Program
            {
                public void Method()
                {
                    void LocalFunction()
                    {
                        $$
                    }
                }
            }
            """, """
            class Program
            {
                public void Method()
                {
                    void LocalFunction()
                    {
                        using ({|0:resource|})
                        {
                            $$
                        }
                    }
                }
            }
            """);
    }
 
    [Fact]
    public async Task InsertUsingSnippetInAnonymousFunctionTest()
    {
        await VerifySnippetAsync("""
            class Program
            {
                public void Method()
                {
                    var action = delegate()
                    {
                        $$
                    };
                }
            }
            """, """
            class Program
            {
                public void Method()
                {
                    var action = delegate()
                    {
                        using ({|0:resource|})
                        {
                            $$
                        }
                    };
                }
            }
            """);
    }
 
    [Fact]
    public async Task InsertUsingSnippetInParenthesizedLambdaExpressionTest()
    {
        await VerifySnippetAsync("""
            class Program
            {
                public void Method()
                {
                    var action = () =>
                    {
                        $$
                    };
                }
            }
            """, """
            class Program
            {
                public void Method()
                {
                    var action = () =>
                    {
                        using ({|0:resource|})
                        {
                            $$
                        }
                    };
                }
            }
            """);
    }
}