// 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;
using System.IO;
using System.Reflection.Metadata.Ecma335;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Emit.UnitTests;
 
public class CompilationOutputFilesTests : TestBase
{
    [Fact]
    public void OpenStream_Errors()
    {
        Assert.Throws<ArgumentException>(() => new CompilationOutputFiles(@"a.dll"));
        Assert.Throws<ArgumentException>(() => new CompilationOutputFiles(@"\a.dll", @"a.dll"));
    }
 
    [Fact]
    public void AssemblyAndPdb()
    {
        var source = @"class C { public static void Main() { int x = 1; } }";
 
        var compilation = CSharpTestBase.CreateCompilationWithMscorlib40AndSystemCore(source, parseOptions: TestOptions.Regular.WithNoRefSafetyRulesAttribute(), options: TestOptions.DebugDll, assemblyName: "lib");
        var pdbStream = new MemoryStream();
        var peImage = compilation.EmitToArray(new EmitOptions(debugInformationFormat: DebugInformationFormat.PortablePdb), pdbStream: pdbStream);
        pdbStream.Position = 0;
 
        var dir = Temp.CreateDirectory();
        var dllFile = dir.CreateFile("a.dll").WriteAllBytes(peImage);
        var pdbFile = dir.CreateFile("a.pdb").WriteAllBytes(pdbStream.ToArray());
 
        var outputs = new CompilationOutputFiles(dllFile.Path, pdbFile.Path);
 
        using (var pdb = outputs.OpenPdb())
        {
            var encReader = pdb.CreateEditAndContinueMethodDebugInfoReader();
            Assert.True(encReader.IsPortable);
            var localSig = encReader.GetLocalSignature(MetadataTokens.MethodDefinitionHandle(1));
            Assert.Equal(MetadataTokens.StandaloneSignatureHandle(1), localSig);
        }
 
        using (var metadata = outputs.OpenAssemblyMetadata(prefetch: false))
        {
            var mdReader = metadata.GetMetadataReader();
            Assert.Equal("lib", mdReader.GetString(mdReader.GetAssemblyDefinition().Name));
        }
 
        // make sure all files are closed and can be deleted
        Directory.Delete(dir.Path, recursive: true);
    }
}