using System;
using System.Runtime.Serialization;
using System.Security.Permissions;
using AspClassic.Scripting.Utils;

namespace AspClassic.Scripting;

[Serializable]
public struct SymbolId : ISerializable, IComparable, IComparable<SymbolId>, IEquatable<SymbolId>
{
	public const int EmptyId = 0;

	public const int InvalidId = -1;

	private readonly int _id;

	public static readonly SymbolId Empty = new SymbolId(0);

	public static readonly SymbolId[] EmptySymbols = new SymbolId[0];

	public static readonly SymbolId Invalid = new SymbolId(-1);

	public int Id => _id;

	public SymbolId CaseInsensitiveIdentifier => new SymbolId(_id & 0xFFFFFF);

	public int CaseInsensitiveId => _id & 0xFFFFFF;

	public bool IsCaseInsensitive => (_id & -16777216) == 0;

	public bool IsEmpty => _id == 0;

	public bool IsInvalid => _id == -1;

	public SymbolId(int value)
	{
		_id = value;
	}

	public SymbolId(SymbolId value)
	{
		_id = value._id;
	}

	public override bool Equals(object obj)
	{
		if (!(obj is SymbolId))
		{
			return false;
		}
		return Equals((SymbolId)obj);
	}

	public bool Equals(SymbolId other)
	{
		if (_id == other._id)
		{
			return true;
		}
		if (IsCaseInsensitive || other.IsCaseInsensitive)
		{
			return (_id & 0xFFFFFF) == (other._id & 0xFFFFFF);
		}
		return false;
	}

	public override int GetHashCode()
	{
		return _id & 0xFFFFFF;
	}

	public override string ToString()
	{
		return SymbolTable.IdToString(this);
	}

	public static explicit operator SymbolId(string s)
	{
		return SymbolTable.StringToId(s);
	}

	public static bool operator ==(SymbolId a, SymbolId b)
	{
		return a.Equals(b);
	}

	public static bool operator !=(SymbolId a, SymbolId b)
	{
		return !a.Equals(b);
	}

	public static bool operator <(SymbolId a, SymbolId b)
	{
		return a.CompareTo(b) < 0;
	}

	public static bool operator >(SymbolId a, SymbolId b)
	{
		return a.CompareTo(b) > 0;
	}

	public int CompareTo(object obj)
	{
		if (!(obj is SymbolId))
		{
			return -1;
		}
		return CompareTo((SymbolId)obj);
	}

	public int CompareTo(SymbolId other)
	{
		string text = SymbolTable.IdToString(this);
		string strB = SymbolTable.IdToString(other);
		return text.CompareTo(strB);
	}

	private SymbolId(SerializationInfo info, StreamingContext context)
	{
		ContractUtils.RequiresNotNull(info, "info");
		_id = SymbolTable.StringToId(info.GetString("symbolName"))._id;
	}

	[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.SerializationFormatter)]
	public void GetObjectData(SerializationInfo info, StreamingContext context)
	{
		ContractUtils.RequiresNotNull(info, "info");
		info.AddValue("symbolName", SymbolTable.IdToString(this));
	}
}