using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TBF.BenchControl.Network.Camera
{
	public class RtpFrame
	{
		public enum STATE
		{
			Empty,
			OK,
			Error,
			Complete,
		}

		public readonly int PayloadType;
		public IList<RtpPacket> Packets;
		public STATE State { get { return state; } }
		STATE state;


		public RtpFrame(int payloadType)
		{
			PayloadType = payloadType;
			Packets = new List<RtpPacket>();
			state = STATE.Empty;
		}

		public STATE AddPacket(RtpPacket packet)
		{
			if (state == STATE.Error || packet.PayloadType != PayloadType)
			{
				return (state = STATE.Error);		/// Already in error or wrong payload type
			}
			else if (state == STATE.Complete)
			{
				return STATE.Complete;				/// Already complete
			}
			else if (state != STATE.Empty && packet.SequenceNumber != Packets.Last<RtpPacket>().SequenceNumber + 1)
			{
				return (state = STATE.Error);		/// Packet out of order
			}

			/// Going to add a new packet previous ones
			Packets.Add(packet);

			if (packet.Mark)
			{
				return (state = STATE.Complete);	/// Complete now
			}
			else
			{
				return (state = STATE.OK);			/// OK, not complete yet
			}
		}

		public void Clear()
		{
			Packets.Clear();
			state = STATE.Empty;
		}
	}
}