using System;
using System.Collections.Generic;
using Roslyn.Utilities;

namespace Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax;

internal sealed class TupleElementSyntax : CSharpSyntaxNode
{
	internal readonly TypeSyntax type;

	internal readonly SyntaxToken? identifier;

	public TypeSyntax Type => type;

	public SyntaxToken? Identifier => identifier;

	internal TupleElementSyntax(SyntaxKind kind, TypeSyntax type, SyntaxToken? identifier, DiagnosticInfo[]? diagnostics, SyntaxAnnotation[]? annotations)
		: base(kind, diagnostics, annotations)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)type);
		this.type = type;
		if (identifier != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)identifier);
			this.identifier = identifier;
		}
	}

	internal TupleElementSyntax(SyntaxKind kind, TypeSyntax type, SyntaxToken? identifier, SyntaxFactoryContext context)
		: base(kind)
	{
		SetFactoryContext(context);
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)type);
		this.type = type;
		if (identifier != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)identifier);
			this.identifier = identifier;
		}
	}

	internal TupleElementSyntax(SyntaxKind kind, TypeSyntax type, SyntaxToken? identifier)
		: base(kind)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)type);
		this.type = type;
		if (identifier != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)identifier);
			this.identifier = identifier;
		}
	}

	internal override GreenNode? GetSlot(int index)
	{
		return (GreenNode?)(index switch
		{
			0 => type, 
			1 => identifier, 
			_ => null, 
		});
	}

	internal override SyntaxNode CreateRed(SyntaxNode? parent, int position)
	{
		return (SyntaxNode)(object)new Microsoft.CodeAnalysis.CSharp.Syntax.TupleElementSyntax(this, parent, position);
	}

	public override void Accept(CSharpSyntaxVisitor visitor)
	{
		visitor.VisitTupleElement(this);
	}

	public override TResult Accept<TResult>(CSharpSyntaxVisitor<TResult> visitor)
	{
		return visitor.VisitTupleElement(this);
	}

	public TupleElementSyntax Update(TypeSyntax type, SyntaxToken identifier)
	{
		if (type != Type || identifier != Identifier)
		{
			TupleElementSyntax tupleElementSyntax = SyntaxFactory.TupleElement(type, identifier);
			DiagnosticInfo[] diagnostics = ((GreenNode)this).GetDiagnostics();
			if (diagnostics != null && diagnostics.Length != 0)
			{
				tupleElementSyntax = GreenNodeExtensions.WithDiagnosticsGreen<TupleElementSyntax>(tupleElementSyntax, diagnostics);
			}
			SyntaxAnnotation[] annotations = ((GreenNode)this).GetAnnotations();
			if (annotations != null && annotations.Length != 0)
			{
				tupleElementSyntax = GreenNodeExtensions.WithAnnotationsGreen<TupleElementSyntax>(tupleElementSyntax, (IEnumerable<SyntaxAnnotation>)annotations);
			}
			return tupleElementSyntax;
		}
		return this;
	}

	internal override GreenNode SetDiagnostics(DiagnosticInfo[]? diagnostics)
	{
		return (GreenNode)(object)new TupleElementSyntax(base.Kind, type, identifier, diagnostics, ((GreenNode)this).GetAnnotations());
	}

	internal override GreenNode SetAnnotations(SyntaxAnnotation[]? annotations)
	{
		return (GreenNode)(object)new TupleElementSyntax(base.Kind, type, identifier, ((GreenNode)this).GetDiagnostics(), annotations);
	}

	internal TupleElementSyntax(ObjectReader reader)
		: base(reader)
	{
		((GreenNode)this).SlotCount = 2;
		TypeSyntax typeSyntax = (TypeSyntax)reader.ReadValue();
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)typeSyntax);
		type = typeSyntax;
		SyntaxToken syntaxToken = (SyntaxToken)reader.ReadValue();
		if (syntaxToken != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)syntaxToken);
			identifier = syntaxToken;
		}
	}

	internal override void WriteTo(ObjectWriter writer)
	{
		((GreenNode)this).WriteTo(writer);
		writer.WriteValue((IObjectWritable)(object)type);
		writer.WriteValue((IObjectWritable)(object)identifier);
	}

	static TupleElementSyntax()
	{
		ObjectBinder.RegisterTypeReader(typeof(TupleElementSyntax), (Func<ObjectReader, IObjectWritable>)((ObjectReader r) => (IObjectWritable)(object)new TupleElementSyntax(r)));
	}
}