﻿// 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.CSharp.Structure;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Structure;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;

namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Structure
{
    [Trait(Traits.Feature, Traits.Features.Outlining)]
    public class SimpleLambdaExpressionStructureTests : AbstractCSharpSyntaxNodeStructureTests<SimpleLambdaExpressionSyntax>
    {
        internal override AbstractSyntaxStructureProvider CreateProvider() => new SimpleLambdaExpressionStructureProvider();

        [Fact]
        public async Task TestLambda()
        {
            const string code = @"
class C
{
    void M()
    {
        {|hint:$$f => {|textspan:{
            x();
        };|}|}
    }
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan", "hint", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
        }

        [Fact]
        public async Task TestLambdaInForLoop()
        {
            const string code = @"
class C
{
    void M()
    {
        for (Action a = x$$ => { }; true; a()) { }
    }
}";

            await VerifyNoBlockSpansAsync(code);
        }

        [Fact]
        public async Task TestLambdaInMethodCall1()
        {
            const string code = @"
class C
{
    void M()
    {
        someMethod(42, ""test"", false, {|hint:$$x => {|textspan:{
            return x;
        }|}|}, ""other arguments}"");
    }
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan", "hint", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
        }

        [Fact]
        public async Task TestLambdaInMethodCall2()
        {
            const string code = @"
class C
{
    void M()
    {
        someMethod(42, ""test"", false, {|hint:$$x => {|textspan:{
            return x;
        }|}|});
    }
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan", "hint", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
        }
    }
}
