﻿// 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 NamespaceDeclarationStructureTests : AbstractCSharpSyntaxNodeStructureTests<NamespaceDeclarationSyntax>
    {
        internal override AbstractSyntaxStructureProvider CreateProvider() => new NamespaceDeclarationStructureProvider();

        [Fact]
        public async Task TestNamespace()
        {
            const string code = @"
class C
{
    {|hint:$$namespace N{|textspan:
    {
    }|}|}
}";

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

        [Fact]
        public async Task TestNamespaceWithLeadingComments()
        {
            const string code = @"
class C
{
    {|span1:// Goo
    // Bar|}
    {|hint2:$$namespace N{|textspan2:
    {
    }|}|}
}";

            await VerifyBlockSpansAsync(code,
                Region("span1", "// Goo ...", autoCollapse: true),
                Region("textspan2", "hint2", CSharpStructureHelpers.Ellipsis, autoCollapse: false));
        }

        [Fact]
        public async Task TestNamespaceWithNestedUsings()
        {
            const string code = @"
class C
{
    {|hint1:$$namespace N{|textspan1:
    {
        {|hint2:using {|textspan2:System;
        using System.Linq;|}|}
    }|}|}
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan1", "hint1", CSharpStructureHelpers.Ellipsis, autoCollapse: false),
                Region("textspan2", "hint2", CSharpStructureHelpers.Ellipsis, autoCollapse: true));
        }

        [Fact]
        public async Task TestNamespaceWithNestedUsingsWithLeadingComments()
        {
            const string code = @"
class C
{
    {|hint1:$$namespace N{|textspan1:
    {
        {|span2:// Goo
        // Bar|}
        {|hint3:using {|textspan3:System;
        using System.Linq;|}|}
    }|}|}
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan1", "hint1", CSharpStructureHelpers.Ellipsis, autoCollapse: false),
                Region("span2", "// Goo ...", autoCollapse: true),
                Region("textspan3", "hint3", CSharpStructureHelpers.Ellipsis, autoCollapse: true));
        }

        [Fact]
        public async Task TestNamespaceWithNestedComments()
        {
            const string code = @"
class C
{
    {|hint1:$$namespace N{|textspan1:
    {
        {|span2:// Goo
        // Bar|}
    }|}|}
}";

            await VerifyBlockSpansAsync(code,
                Region("textspan1", "hint1", CSharpStructureHelpers.Ellipsis, autoCollapse: false),
                Region("span2", "// Goo ...", autoCollapse: true));
        }
    }
}
