using System;
using System.Runtime.InteropServices;

namespace ENet
{
	public enum EventType
	{
		None = 0,
		Connect = 1,
		Disconnect = 2,
		Receive = 3
	}

	public enum PeerState
	{
		Uninitialized = -1,
		Disconnected = 0,
		Connecting = 1,
		AcknowledgingConnect = 2,
		ConnectionPending = 3,
		ConnectionSucceeded = 4,
		Connected = 5,
		DisconnectLater = 6,
		Disconnecting = 7,
		AcknowledgingDisconnect = 8,
		Zombie = 9
	}

	[Flags]
	public enum PacketFlags
	{
		None = 0,
		Reliable = 1 << 0,
		Unsequenced = 1 << 1,
		NoAllocate = 1 << 2
	}

	[StructLayout(LayoutKind.Sequential)]
	public struct ENetAddress
	{
		public uint Host;
		public ushort Port;
	}

	[StructLayout(LayoutKind.Sequential)]
	public struct ENetCallbacks
	{
		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
		public delegate IntPtr MallocCb(IntPtr size);

		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
		public delegate void FreeCb(IntPtr memory);

		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
		public delegate void NoMemoryCb();

		private readonly IntPtr malloc;
		private readonly IntPtr free;
		private readonly IntPtr no_memory;
	}

	[StructLayout(LayoutKind.Sequential)]
	public class ENetEvent
	{
		public EventType Type;
		public IntPtr Peer;
		public byte ChannelID;
		public uint Data;
		public IntPtr Packet;
	}

	[StructLayout(LayoutKind.Sequential)]
	public struct ENetHost
	{
	}

	[StructLayout(LayoutKind.Sequential)]
	public class ENetListNode
	{
		public ENetListNode Next;
		public ENetListNode Previous;
	}

	[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
	public delegate void ENetPacketFreeCallback(ref ENetPacket param0);

	[StructLayout(LayoutKind.Sequential)]
	public struct ENetPacket
	{
		public uint ReferenceCount;
		public uint Flags;
		public IntPtr Data;
		public uint DataLength;
		public ENetPacketFreeCallback FreeCallback;
		public IntPtr UserData;
	}

	[StructLayout(LayoutKind.Sequential)]
	public struct ENetPeer
	{
		public ENetListNode DispatchList;
		public readonly IntPtr Host;
		public readonly ushort OutgoingPeerID;
		public readonly ushort IncomingPeerID;
		public readonly uint ConnectID;
		public readonly byte OutgoingSessionID;
		public readonly byte IncomingSessionID;
		public ENetAddress Address;
		public IntPtr Data;
		public readonly PeerState State;
	}
}