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

namespace Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax;

internal sealed class SelectClauseSyntax : SelectOrGroupClauseSyntax
{
	internal readonly SyntaxToken selectKeyword;

	internal readonly ExpressionSyntax expression;

	public SyntaxToken SelectKeyword => selectKeyword;

	public ExpressionSyntax Expression => expression;

	internal SelectClauseSyntax(SyntaxKind kind, SyntaxToken selectKeyword, ExpressionSyntax expression, DiagnosticInfo[]? diagnostics, SyntaxAnnotation[]? annotations)
		: base(kind, diagnostics, annotations)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)selectKeyword);
		this.selectKeyword = selectKeyword;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)expression);
		this.expression = expression;
	}

	internal SelectClauseSyntax(SyntaxKind kind, SyntaxToken selectKeyword, ExpressionSyntax expression, SyntaxFactoryContext context)
		: base(kind)
	{
		SetFactoryContext(context);
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)selectKeyword);
		this.selectKeyword = selectKeyword;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)expression);
		this.expression = expression;
	}

	internal SelectClauseSyntax(SyntaxKind kind, SyntaxToken selectKeyword, ExpressionSyntax expression)
		: base(kind)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)selectKeyword);
		this.selectKeyword = selectKeyword;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)expression);
		this.expression = expression;
	}

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

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

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

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

	public SelectClauseSyntax Update(SyntaxToken selectKeyword, ExpressionSyntax expression)
	{
		if (selectKeyword != SelectKeyword || expression != Expression)
		{
			SelectClauseSyntax selectClauseSyntax = SyntaxFactory.SelectClause(selectKeyword, expression);
			DiagnosticInfo[] diagnostics = ((GreenNode)this).GetDiagnostics();
			if (diagnostics != null && diagnostics.Length != 0)
			{
				selectClauseSyntax = GreenNodeExtensions.WithDiagnosticsGreen<SelectClauseSyntax>(selectClauseSyntax, diagnostics);
			}
			SyntaxAnnotation[] annotations = ((GreenNode)this).GetAnnotations();
			if (annotations != null && annotations.Length != 0)
			{
				selectClauseSyntax = GreenNodeExtensions.WithAnnotationsGreen<SelectClauseSyntax>(selectClauseSyntax, (IEnumerable<SyntaxAnnotation>)annotations);
			}
			return selectClauseSyntax;
		}
		return this;
	}

	internal override GreenNode SetDiagnostics(DiagnosticInfo[]? diagnostics)
	{
		return (GreenNode)(object)new SelectClauseSyntax(base.Kind, selectKeyword, expression, diagnostics, ((GreenNode)this).GetAnnotations());
	}

	internal override GreenNode SetAnnotations(SyntaxAnnotation[]? annotations)
	{
		return (GreenNode)(object)new SelectClauseSyntax(base.Kind, selectKeyword, expression, ((GreenNode)this).GetDiagnostics(), annotations);
	}

	internal SelectClauseSyntax(ObjectReader reader)
		: base(reader)
	{
		((GreenNode)this).SlotCount = 2;
		SyntaxToken syntaxToken = (SyntaxToken)reader.ReadValue();
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)syntaxToken);
		selectKeyword = syntaxToken;
		ExpressionSyntax expressionSyntax = (ExpressionSyntax)reader.ReadValue();
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)expressionSyntax);
		expression = expressionSyntax;
	}

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

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