using System;
using System.IO;
using System.Linq;
using System.Reflection.Metadata;
using System.Reflection.PortableExecutable;
using Xunit;

namespace MetadataTests
{
    public class UnitTest1
    {
        [Fact]
        public void Test1()
        {
            using (var stream = File.OpenRead(typeof(UnitTest1).Assembly.Location))
            using (var reader = new PEReader(stream))
            {
                Func<string, Stream> streamProvider = p => new FileStream(p, FileMode.Open, FileAccess.Read);

                var metadata = reader.GetMetadataReader(MetadataReaderOptions.ApplyWindowsRuntimeProjections);
                var pdbLoaded = reader.TryOpenAssociatedPortablePdb(stream.Name, streamProvider, out var metadataReaderProvider,
                    out var pdbPath);
                Assert.True(pdbLoaded);
                var metadataSymbol = metadataReaderProvider.GetMetadataReader();
                var type = metadata.TypeDefinitions.Select(metadata.GetTypeDefinition).First(a => metadata.GetString(a.Name).Equals(nameof(UnitTest1)));
                
                var meta = type.GetMethods().Select(a => metadataSymbol.GetMethodDebugInformation(a)).ToList();

                var debug = meta.SelectMany(a => a.GetSequencePoints()).Select(a => a.Document).First();
                var docu = metadataSymbol.GetDocument(debug);

                var name = metadataSymbol.GetString(docu.Name);
                Assert.Contains("UnitTest1.cs", name);
            }
        }
    }
}