// 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;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Formatting;
using Microsoft.CodeAnalysis.Editing;
using Microsoft.CodeAnalysis.Formatting;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.CSharp.UnitTests.CodeGeneration
{
    using static CSharpSyntaxTokens;
    using static SyntaxFactory;
 
    [UseExportProvider]
    public class AddAttributesTests
    {
        private static Document GetDocument(string code)
        {
            var ws = new AdhocWorkspace();
            var emptyProject = ws.AddProject(
                ProjectInfo.Create(
                    ProjectId.CreateNewId(),
                    VersionStamp.Default,
                    "test",
                    "test.dll",
                    LanguageNames.CSharp,
                    metadataReferences: [NetFramework.mscorlib]));
 
            return emptyProject.AddDocument("test.cs", code);
        }
 
        private static async Task TestAsync(string initialText, string attributeAddedText)
        {
            var doc = GetDocument(initialText);
 
            var attributeList =
                AttributeList(
                    [Attribute(
                        IdentifierName("System.Reflection.AssemblyVersion(\"1.0.0.0\")"))])
                .WithTarget(
                    AttributeTargetSpecifier(
                        AssemblyKeyword));
 
            var syntaxRoot = await doc.GetSyntaxRootAsync();
            var editor = await DocumentEditor.CreateAsync(doc);
 
            editor.AddAttribute(syntaxRoot, attributeList);
 
            var changedDoc = editor.GetChangedDocument();
 
            if (attributeAddedText != null)
            {
                var formatted = await Formatter.FormatAsync(changedDoc, SyntaxAnnotation.ElasticAnnotation, CSharpSyntaxFormattingOptions.Default, CancellationToken.None);
                var actualText = (await formatted.GetTextAsync()).ToString();
 
                Assert.Equal(attributeAddedText, actualText);
            }
        }
 
        [Fact]
        public async Task TestAddAssemblyAttributeListToEmptyDocument()
        {
            await TestAsync(
string.Empty,
@"[assembly: System.Reflection.AssemblyVersion(""1.0.0.0"")]
");
        }
 
        [Fact]
        public async Task TestAddAssemblyAttributeListToDocumentWithOtherAssemblyAttribute()
        {
            await TestAsync(
@"[assembly: System.Reflection.AssemblyName(""Test"")]",
@"[assembly: System.Reflection.AssemblyName(""Test"")]
[assembly: System.Reflection.AssemblyVersion(""1.0.0.0"")]
");
        }
    }
}