// 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 sealed 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"")]
");
    }
}