using System.Diagnostics;
using Microsoft.CodeAnalysis.CSharp.Symbols;

namespace Microsoft.CodeAnalysis.CSharp;

internal sealed class BoundDefaultExpression : BoundExpression
{
	public new TypeSymbol Type => base.Type;

	public BoundTypeExpression? TargetType { get; }

	public override ConstantValue? ConstantValueOpt { get; }

	public BoundDefaultExpression(SyntaxNode syntax, TypeSymbol type, bool hasErrors = false)
		: this(syntax, null, type.GetDefaultValue(), type, hasErrors)
	{
	}

	public BoundDefaultExpression(SyntaxNode syntax, BoundTypeExpression? targetType, ConstantValue? constantValueOpt, TypeSymbol type, bool hasErrors = false)
		: base(BoundKind.DefaultExpression, syntax, type, hasErrors || targetType.HasErrors())
	{
		TargetType = targetType;
		ConstantValueOpt = constantValueOpt;
	}

	[DebuggerStepThrough]
	public override BoundNode? Accept(BoundTreeVisitor visitor)
	{
		return visitor.VisitDefaultExpression(this);
	}

	public BoundDefaultExpression Update(BoundTypeExpression? targetType, ConstantValue? constantValueOpt, TypeSymbol type)
	{
		if (targetType != TargetType || constantValueOpt != ConstantValueOpt || !TypeSymbol.Equals(type, Type, (TypeCompareKind)0))
		{
			BoundDefaultExpression boundDefaultExpression = new BoundDefaultExpression(Syntax, targetType, constantValueOpt, type, base.HasErrors);
			boundDefaultExpression.CopyAttributes(this);
			return boundDefaultExpression;
		}
		return this;
	}
}