#region Copyright & License Information
/*
 * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see COPYING.
 */
#endregion

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

namespace OpenRA.Network
{
	class FrameData
	{
		public struct ClientOrder
		{
			public int Client;
			public Order Order;
		}

		readonly Dictionary<int, int> clientQuitTimes = new Dictionary<int, int>();
		readonly Dictionary<int, Dictionary<int, byte[]>> framePackets = new Dictionary<int, Dictionary<int, byte[]>>();

		public IEnumerable<int> ClientsPlayingInFrame( int frame )
		{
			return clientQuitTimes
				.Where( x => frame <= x.Value )
				.Select( x => x.Key )
				.OrderBy( x => x );
		}

		public void ClientQuit( int clientId, int lastClientFrame )
		{
			clientQuitTimes[clientId] = lastClientFrame;
		}

		public void AddFrameOrders( int clientId, int frame, byte[] orders )
		{
			var frameData = framePackets.GetOrAdd( frame );
			frameData.Add( clientId, orders );
		}

		public bool IsReadyForFrame(int frame)
		{
			return !ClientsNotReadyForFrame(frame).Any();
		}

		public IEnumerable<int> ClientsNotReadyForFrame(int frame)
		{
			var frameData = framePackets.GetOrAdd(frame);
			return ClientsPlayingInFrame(frame)
				.Where(client => !frameData.ContainsKey(client));
		}

		public IEnumerable<ClientOrder> OrdersForFrame( World world, int frame )
		{
			var frameData = framePackets[ frame ];
			var clientData = ClientsPlayingInFrame( frame )
				.ToDictionary( k => k, v => frameData[ v ] );

			return clientData
				.SelectMany( x => x.Value
					.ToOrderList( world )
					.Select( o => new ClientOrder { Client = x.Key, Order = o } ) );
		}
	}
}