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

namespace Microsoft.CodeAnalysis.CSharp.Syntax.InternalSyntax;

internal sealed class SlicePatternSyntax : PatternSyntax
{
	internal readonly SyntaxToken dotDotToken;

	internal readonly PatternSyntax? pattern;

	public SyntaxToken DotDotToken => dotDotToken;

	public PatternSyntax? Pattern => pattern;

	internal SlicePatternSyntax(SyntaxKind kind, SyntaxToken dotDotToken, PatternSyntax? pattern, DiagnosticInfo[]? diagnostics, SyntaxAnnotation[]? annotations)
		: base(kind, diagnostics, annotations)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)dotDotToken);
		this.dotDotToken = dotDotToken;
		if (pattern != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)pattern);
			this.pattern = pattern;
		}
	}

	internal SlicePatternSyntax(SyntaxKind kind, SyntaxToken dotDotToken, PatternSyntax? pattern, SyntaxFactoryContext context)
		: base(kind)
	{
		SetFactoryContext(context);
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)dotDotToken);
		this.dotDotToken = dotDotToken;
		if (pattern != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)pattern);
			this.pattern = pattern;
		}
	}

	internal SlicePatternSyntax(SyntaxKind kind, SyntaxToken dotDotToken, PatternSyntax? pattern)
		: base(kind)
	{
		((GreenNode)this).SlotCount = 2;
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)dotDotToken);
		this.dotDotToken = dotDotToken;
		if (pattern != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)pattern);
			this.pattern = pattern;
		}
	}

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

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

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

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

	public SlicePatternSyntax Update(SyntaxToken dotDotToken, PatternSyntax pattern)
	{
		if (dotDotToken != DotDotToken || pattern != Pattern)
		{
			SlicePatternSyntax slicePatternSyntax = SyntaxFactory.SlicePattern(dotDotToken, pattern);
			DiagnosticInfo[] diagnostics = ((GreenNode)this).GetDiagnostics();
			if (diagnostics != null && diagnostics.Length != 0)
			{
				slicePatternSyntax = GreenNodeExtensions.WithDiagnosticsGreen<SlicePatternSyntax>(slicePatternSyntax, diagnostics);
			}
			SyntaxAnnotation[] annotations = ((GreenNode)this).GetAnnotations();
			if (annotations != null && annotations.Length != 0)
			{
				slicePatternSyntax = GreenNodeExtensions.WithAnnotationsGreen<SlicePatternSyntax>(slicePatternSyntax, (IEnumerable<SyntaxAnnotation>)annotations);
			}
			return slicePatternSyntax;
		}
		return this;
	}

	internal override GreenNode SetDiagnostics(DiagnosticInfo[]? diagnostics)
	{
		return (GreenNode)(object)new SlicePatternSyntax(base.Kind, dotDotToken, pattern, diagnostics, ((GreenNode)this).GetAnnotations());
	}

	internal override GreenNode SetAnnotations(SyntaxAnnotation[]? annotations)
	{
		return (GreenNode)(object)new SlicePatternSyntax(base.Kind, dotDotToken, pattern, ((GreenNode)this).GetDiagnostics(), annotations);
	}

	internal SlicePatternSyntax(ObjectReader reader)
		: base(reader)
	{
		((GreenNode)this).SlotCount = 2;
		SyntaxToken syntaxToken = (SyntaxToken)reader.ReadValue();
		((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)syntaxToken);
		dotDotToken = syntaxToken;
		PatternSyntax patternSyntax = (PatternSyntax)reader.ReadValue();
		if (patternSyntax != null)
		{
			((GreenNode)this).AdjustFlagsAndWidth((GreenNode)(object)patternSyntax);
			pattern = patternSyntax;
		}
	}

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

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