using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a parameter.
/// </summary>
public sealed class Parameter : Tree
{
	private readonly AttributeBlockCollection _Attributes;

	private readonly ModifierCollection _Modifiers;

	private readonly VariableName _VariableName;

	private readonly Location _AsLocation;

	private readonly TypeName _ParameterType;

	private readonly Location _EqualsLocation;

	private readonly Initializer _Initializer;

	/// <summary>
	/// The attributes on the parameter.
	/// </summary>
	public AttributeBlockCollection Attributes => _Attributes;

	/// <summary>
	/// The modifiers on the parameter.
	/// </summary>
	public ModifierCollection Modifiers => _Modifiers;

	/// <summary>
	/// The name of the parameter.
	/// </summary>
	public VariableName VariableName => _VariableName;

	/// <summary>
	/// The location of the 'As', if any.
	/// </summary>
	public Location AsLocation => _AsLocation;

	/// <summary>
	/// The parameter type, if any.
	/// </summary>
	public TypeName ParameterType => _ParameterType;

	/// <summary>
	/// The location of the '=', if any.
	/// </summary>
	public Location EqualsLocation => _EqualsLocation;

	/// <summary>
	/// The initializer for the parameter, if any.
	/// </summary>
	public Initializer Initializer => _Initializer;

	/// <summary>
	/// Constructs a new parameter parse tree.
	/// </summary>
	/// <param name="attributes">The attributes on the parameter.</param>
	/// <param name="modifiers">The modifiers on the parameter.</param>
	/// <param name="variableName">The name of the parameter.</param>
	/// <param name="asLocation">The location of the 'As'.</param>
	/// <param name="parameterType">The type of the parameter. Can be Nothing.</param>
	/// <param name="equalsLocation">The location of the '='.</param>
	/// <param name="initializer">The initializer for the parameter. Can be Nothing.</param>
	/// <param name="span">The location of the parse tree.</param>
	public Parameter(AttributeBlockCollection attributes, ModifierCollection modifiers, VariableName variableName, Location asLocation, TypeName parameterType, Location equalsLocation, Initializer initializer, Span span)
		: base(TreeType.Parameter, span)
	{
		if (variableName == null)
		{
			throw new ArgumentNullException("variableName");
		}
		SetParent(attributes);
		SetParent(modifiers);
		SetParent(variableName);
		SetParent(parameterType);
		SetParent(initializer);
		_Attributes = attributes;
		_Modifiers = modifiers;
		_VariableName = variableName;
		_AsLocation = asLocation;
		_ParameterType = parameterType;
		_EqualsLocation = equalsLocation;
		_Initializer = initializer;
	}

	protected override void GetChildTrees(IList<Tree> childList)
	{
		Tree.AddChild(childList, Attributes);
		Tree.AddChild(childList, Modifiers);
		Tree.AddChild(childList, VariableName);
		Tree.AddChild(childList, ParameterType);
		Tree.AddChild(childList, Initializer);
	}
}