using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for an attribute usage.
/// </summary>
public sealed class Attribute : Tree
{
	private readonly AttributeTypes _AttributeType;

	private readonly Location _AttributeTypeLocation;

	private readonly Location _ColonLocation;

	private readonly Name _Name;

	private readonly ArgumentCollection _Arguments;

	/// <summary>
	/// The target type of the attribute.
	/// </summary>
	public AttributeTypes AttributeType => _AttributeType;

	/// <summary>
	/// The location of the attribute type, if any.
	/// </summary>
	public Location AttributeTypeLocation => _AttributeTypeLocation;

	/// <summary>
	/// The location of the ':', if any.
	/// </summary>
	public Location ColonLocation => _ColonLocation;

	/// <summary>
	/// The name of the attribute being applied.
	/// </summary>
	public Name Name => _Name;

	/// <summary>
	/// The arguments to the attribute.
	/// </summary>
	public ArgumentCollection Arguments => _Arguments;

	/// <summary>
	/// Constructs a new attribute parse tree.
	/// </summary>
	/// <param name="attributeType">The target type of the attribute.</param>
	/// <param name="attributeTypeLocation">The location of the attribute type.</param>
	/// <param name="colonLocation">The location of the ':'.</param>
	/// <param name="name">The name of the attribute being applied.</param>
	/// <param name="arguments">The arguments to the attribute.</param>
	/// <param name="span">The location of the parse tree.</param>
	public Attribute(AttributeTypes attributeType, Location attributeTypeLocation, Location colonLocation, Name name, ArgumentCollection arguments, Span span)
		: base(TreeType.Attribute, span)
	{
		if (name == null)
		{
			throw new ArgumentNullException("name");
		}
		SetParent(name);
		SetParent(arguments);
		_AttributeType = attributeType;
		_AttributeTypeLocation = attributeTypeLocation;
		_ColonLocation = colonLocation;
		_Name = name;
		_Arguments = arguments;
	}

	protected override void GetChildTrees(IList<Tree> childList)
	{
		Tree.AddChild(childList, Name);
		Tree.AddChild(childList, Arguments);
	}
}