using System;

namespace ProtoBuf;

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Interface, AllowMultiple = false, Inherited = false)]
public sealed class ProtoContractAttribute : Attribute
{
	private int implicitFirstTag;

	private ushort flags;

	private const ushort OPTIONS_InferTagFromName = 1;

	private const ushort OPTIONS_InferTagFromNameHasValue = 2;

	private const ushort OPTIONS_UseProtoMembersOnly = 4;

	private const ushort OPTIONS_SkipConstructor = 8;

	private const ushort OPTIONS_IgnoreListHandling = 16;

	private const ushort OPTIONS_AsReferenceDefault = 32;

	private const ushort OPTIONS_EnumPassthru = 64;

	private const ushort OPTIONS_EnumPassthruHasValue = 128;

	private const ushort OPTIONS_IsGroup = 256;

	public string Name { get; set; }

	public int ImplicitFirstTag
	{
		get
		{
			return implicitFirstTag;
		}
		set
		{
			if (value < 1)
			{
				throw new ArgumentOutOfRangeException("ImplicitFirstTag");
			}
			implicitFirstTag = value;
		}
	}

	public bool UseProtoMembersOnly
	{
		get
		{
			return HasFlag(4);
		}
		set
		{
			SetFlag(4, value);
		}
	}

	public bool IgnoreListHandling
	{
		get
		{
			return HasFlag(16);
		}
		set
		{
			SetFlag(16, value);
		}
	}

	public ImplicitFields ImplicitFields { get; set; }

	public bool InferTagFromName
	{
		get
		{
			return HasFlag(1);
		}
		set
		{
			SetFlag(1, value);
			SetFlag(2, value: true);
		}
	}

	internal bool InferTagFromNameHasValue => HasFlag(2);

	public int DataMemberOffset { get; set; }

	public bool SkipConstructor
	{
		get
		{
			return HasFlag(8);
		}
		set
		{
			SetFlag(8, value);
		}
	}

	public bool AsReferenceDefault
	{
		get
		{
			return HasFlag(32);
		}
		set
		{
			SetFlag(32, value);
		}
	}

	public bool IsGroup
	{
		get
		{
			return HasFlag(256);
		}
		set
		{
			SetFlag(256, value);
		}
	}

	public bool EnumPassthru
	{
		get
		{
			return HasFlag(64);
		}
		set
		{
			SetFlag(64, value);
			SetFlag(128, value: true);
		}
	}

	public Type Surrogate { get; set; }

	internal bool EnumPassthruHasValue => HasFlag(128);

	private bool HasFlag(ushort flag)
	{
		return (flags & flag) == flag;
	}

	private void SetFlag(ushort flag, bool value)
	{
		if (value)
		{
			flags |= flag;
		}
		else
		{
			flags = (ushort)(flags & ~flag);
		}
	}
}