using System;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a simple name (e.g. 'foo').
/// </summary>
public sealed class SimpleName : Name
{
	private readonly string _Name;

	private readonly TypeCharacter _TypeCharacter;

	private readonly bool _Escaped;

	/// <summary>
	/// The name, if any.
	/// </summary>
	public string Name => _Name;

	/// <summary>
	/// The type character.
	/// </summary>
	public TypeCharacter TypeCharacter => _TypeCharacter;

	/// <summary>
	/// Whether the name is escaped.
	/// </summary>
	public bool Escaped => _Escaped;

	public override bool IsBad => Name == null;

	/// <summary>
	/// Creates a bad simple name.
	/// </summary>
	/// <param name="Span">The location of the parse tree.</param>
	/// <returns>A bad simple name.</returns>
	public static SimpleName GetBadSimpleName(Span span)
	{
		return new SimpleName(span);
	}

	/// <summary>
	/// Constructs a new simple name parse tree.
	/// </summary>
	/// <param name="name">The name, if any.</param>
	/// <param name="typeCharacter">The type character.</param>
	/// <param name="escaped">Whether the name is escaped.</param>
	/// <param name="span">The location of the parse tree.</param>
	public SimpleName(string name, TypeCharacter typeCharacter, bool escaped, Span span)
		: base(TreeType.SimpleName, span)
	{
		if (typeCharacter != 0 && escaped)
		{
			throw new ArgumentException("Escaped named cannot have type characters.");
		}
		if (typeCharacter != 0 && typeCharacter != TypeCharacter.DecimalSymbol && typeCharacter != TypeCharacter.DoubleSymbol && typeCharacter != TypeCharacter.IntegerSymbol && typeCharacter != TypeCharacter.LongSymbol && typeCharacter != TypeCharacter.SingleSymbol && typeCharacter != TypeCharacter.StringSymbol)
		{
			throw new ArgumentOutOfRangeException("typeCharacter");
		}
		if (name == null)
		{
			throw new ArgumentNullException("name");
		}
		_Name = name;
		_TypeCharacter = typeCharacter;
		_Escaped = escaped;
	}

	private SimpleName(Span span)
		: base(TreeType.SimpleName, span)
	{
	}
}