using System.Collections.Immutable;
using System.Threading;
using Microsoft.Cci;
using Microsoft.CodeAnalysis.CSharp.Emit;
using Microsoft.CodeAnalysis.CSharp.Emit.NoPia;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.Emit;

namespace Microsoft.CodeAnalysis.CSharp;

internal sealed class SynthesizedMetadataCompiler : CSharpSymbolVisitor
{
	private readonly PEModuleBuilder _moduleBeingBuilt;

	private readonly CancellationToken _cancellationToken;

	private SynthesizedMetadataCompiler(PEModuleBuilder moduleBeingBuilt, CancellationToken cancellationToken)
	{
		_moduleBeingBuilt = moduleBeingBuilt;
		_cancellationToken = cancellationToken;
	}

	public static void ProcessSynthesizedMembers(CSharpCompilation compilation, PEModuleBuilder moduleBeingBuilt, CancellationToken cancellationToken)
	{
		new SynthesizedMetadataCompiler(moduleBeingBuilt, cancellationToken).Visit(compilation.SourceModule.GlobalNamespace);
	}

	public override void VisitNamespace(NamespaceSymbol symbol)
	{
		CancellationToken cancellationToken = _cancellationToken;
		cancellationToken.ThrowIfCancellationRequested();
		ImmutableArray<Symbol>.Enumerator enumerator = symbol.GetMembers().GetEnumerator();
		while (enumerator.MoveNext())
		{
			enumerator.Current.Accept(this);
		}
	}

	public override void VisitNamedType(NamedTypeSymbol symbol)
	{
		//IL_007a: Unknown result type (might be due to invalid IL or missing references)
		//IL_007f: Unknown result type (might be due to invalid IL or missing references)
		//IL_0081: Unknown result type (might be due to invalid IL or missing references)
		//IL_0085: Invalid comparison between Unknown and I4
		//IL_0087: Unknown result type (might be due to invalid IL or missing references)
		//IL_008b: Invalid comparison between Unknown and I4
		CancellationToken cancellationToken = _cancellationToken;
		cancellationToken.ThrowIfCancellationRequested();
		if (symbol is SourceMemberContainerTypeSymbol sourceMemberContainerTypeSymbol && _moduleBeingBuilt != null)
		{
			ImmutableArray<SynthesizedExplicitImplementationForwardingMethod>.Enumerator enumerator = sourceMemberContainerTypeSymbol.GetSynthesizedExplicitImplementations(_cancellationToken).ForwardingMethods.GetEnumerator();
			while (enumerator.MoveNext())
			{
				SynthesizedExplicitImplementationForwardingMethod current = enumerator.Current;
				((PEModuleBuilder<CSharpCompilation, SourceModuleSymbol, AssemblySymbol, TypeSymbol, NamedTypeSymbol, MethodSymbol, SyntaxNode, EmbeddedTypesManager, ModuleCompilationState>)_moduleBeingBuilt).AddSynthesizedDefinition(symbol, (IMethodDefinition)(object)current.GetCciAdapter());
			}
		}
		ImmutableArray<Symbol>.Enumerator enumerator2 = symbol.GetMembers().GetEnumerator();
		while (enumerator2.MoveNext())
		{
			Symbol current2 = enumerator2.Current;
			SymbolKind kind = current2.Kind;
			if ((int)kind == 11 || (int)kind == 15)
			{
				current2.Accept(this);
			}
		}
	}

	public override void VisitProperty(PropertySymbol symbol)
	{
		if (symbol is SourcePropertySymbolBase { IsSealed: not false, SynthesizedSealedAccessorOpt: { } synthesizedSealedAccessorOpt } sourcePropertySymbolBase)
		{
			((PEModuleBuilder<CSharpCompilation, SourceModuleSymbol, AssemblySymbol, TypeSymbol, NamedTypeSymbol, MethodSymbol, SyntaxNode, EmbeddedTypesManager, ModuleCompilationState>)_moduleBeingBuilt).AddSynthesizedDefinition(sourcePropertySymbolBase.ContainingType, (IMethodDefinition)(object)synthesizedSealedAccessorOpt.GetCciAdapter());
		}
	}
}