using System.Collections.Immutable;
using System.Threading;
using Microsoft.CodeAnalysis.CSharp.Emit;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.CSharp.Symbols;

internal sealed class SubstitutedFieldSymbol : WrappedFieldSymbol
{
	private readonly SubstitutedNamedTypeSymbol _containingType;

	private TypeWithAnnotations.Boxed _lazyType;

	public override Symbol ContainingSymbol => _containingType;

	public override NamedTypeSymbol ContainingType => _containingType;

	public override FieldSymbol OriginalDefinition => _underlyingField;

	public override bool IsImplicitlyDeclared
	{
		get
		{
			if (ContainingType.IsTupleType && IsDefaultTupleElement)
			{
				return true;
			}
			return base.IsImplicitlyDeclared;
		}
	}

	public override Symbol AssociatedSymbol => OriginalDefinition.AssociatedSymbol?.SymbolAsMember(ContainingType);

	public override RefKind RefKind => _underlyingField.RefKind;

	public override ImmutableArray<CustomModifier> RefCustomModifiers => _containingType.TypeSubstitution.SubstituteCustomModifiers(_underlyingField.RefCustomModifiers);

	internal SubstitutedFieldSymbol(SubstitutedNamedTypeSymbol containingType, FieldSymbol substitutedFrom)
		: base(substitutedFrom.OriginalDefinition)
	{
		_containingType = containingType;
	}

	internal override TypeWithAnnotations GetFieldType(ConsList<FieldSymbol> fieldsBeingBound)
	{
		if (_lazyType == null)
		{
			TypeWithAnnotations value = _containingType.TypeSubstitution.SubstituteType(OriginalDefinition.GetFieldType(fieldsBeingBound));
			Interlocked.CompareExchange(ref _lazyType, new TypeWithAnnotations.Boxed(value), null);
		}
		return _lazyType.Value;
	}

	public override ImmutableArray<CSharpAttributeData> GetAttributes()
	{
		return OriginalDefinition.GetAttributes();
	}

	internal override NamedTypeSymbol FixedImplementationType(PEModuleBuilder emitModule)
	{
		return (NamedTypeSymbol)_containingType.TypeSubstitution.SubstituteType(OriginalDefinition.FixedImplementationType(emitModule)).Type;
	}

	public override bool Equals(Symbol obj, TypeCompareKind compareKind)
	{
		//IL_001c: Unknown result type (might be due to invalid IL or missing references)
		if ((object)this == obj)
		{
			return true;
		}
		if (obj is FieldSymbol fieldSymbol && TypeSymbol.Equals(_containingType, fieldSymbol.ContainingType, compareKind))
		{
			return OriginalDefinition == fieldSymbol.OriginalDefinition;
		}
		return false;
	}

	public override int GetHashCode()
	{
		int num = OriginalDefinition.GetHashCode();
		int hashCode = _containingType.GetHashCode();
		if (hashCode != OriginalDefinition.ContainingType.GetHashCode())
		{
			num = Hash.Combine(hashCode, num);
		}
		return num;
	}
}