using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using bbiwarg.Recognition.TouchRecognition;
using bbiwarg.Recognition.PalmRecognition;
using bbiwarg.Utility;
using bbiwarg.Input.InputHandling;
using TUIO;

namespace bbiwarg.TUIO
{
    /// <summary>
    /// TuioCommunicator sends generated touch events and palm grid coordinates to tuio clients using a <see cref="TuioServer"/>.
    /// </summary>
    class TuioCommunicator
    {
        /// <summary>
        /// the tuio server
        /// </summary>
        private TuioServer server;

        /// <summary>
        /// dictionary of lists of tuio cursors indexed by touch id
        /// </summary>
        private Dictionary<int, TuioCursor> tcursors;

        /// <summary>
        /// dictionary of lists of tuio objects indexed by palm id
        /// </summary>
        private Dictionary<int, List<TuioObject>> tobjects;


        /// <summary>
        /// Constructs a TuioCommunicator.
        /// </summary>
        /// <param name="host">server ip</param>
        /// <param name="port">server port</param>
        public TuioCommunicator(string host, int port)
        {
            server = new TuioServer(host, port);
            tcursors = new Dictionary<int, TuioCursor>();
            tobjects = new Dictionary<int, List<TuioObject>>();
        }

        /// <summary>
        /// Handles the event that a new frame is finished processing by updating the cursors and objects and sending them.
        /// </summary>
        /// <param name="sender">event sender</param>
        /// <param name="e">event arguments</param>
        public void handleNewFrameData(object sender, NewProcessedFrameEventArgs e)
        {
            server.initFrame();
            FrameData frameData = e.FrameData;
            lock (frameData)
            {
                if (frameData.ResetFlag)
                    reset();

                foreach (TouchEvent te in frameData.TouchEvents)
                {
                    switch (te.Type)
                    {
                        case TouchEventType.Down:
                            TuioCursor tcur = server.addTuioCursor(te.Touch.RelativePosition.X, te.Touch.RelativePosition.Y);
                            tcursors.Add(te.Touch.TrackID, tcur);
                            break;
                        case TouchEventType.Move:
                            server.updateTuioCursor(tcursors[te.Touch.TrackID], te.Touch.RelativePosition.X, te.Touch.RelativePosition.Y);
                            break;
                        case TouchEventType.Up:
                            server.removeTuioCursor(tcursors[te.Touch.TrackID]);
                            tcursors.Remove(te.Touch.TrackID);
                            break;
                    }
                }

                List<int> updatedIDs = new List<int>();
                foreach (Palm palm in frameData.TrackedPalms)
                {
                    if (tobjects.Keys.Contains(palm.TrackID))
                    {
                        // update / move
                        List<TuioObject> palmTobjs = tobjects[palm.TrackID];
                        Vector2D[] corners = palm.Quad.Corners;
                        for (int i = 0; i < 4; i++)
                            server.updateTuioObject(palmTobjs[i], corners[i].X, corners[i].Y);
                        updatedIDs.Add(palm.TrackID);
                    }
                    else
                    {
                        // add / create
                        List<TuioObject> palmTobjs = new List<TuioObject>();
                        Vector2D[] corners = palm.Quad.Corners;
                        for (int i = 0; i < 4; i++)
                            palmTobjs.Add(server.addTuioObject(corners[i].X, corners[i].Y, palm.TrackID + 0.1f*i));
                        tobjects.Add(palm.TrackID, palmTobjs);
                        updatedIDs.Add(palm.TrackID);
                    }
                }

                // remove
                List<int> ids = tobjects.Keys.ToList();
                for (int i = ids.Count - 1; i >= 0;i-- )
                    {
                        int id = ids[i];
                        if (!updatedIDs.Contains(id))
                        {
                            foreach (TuioObject tobj in tobjects[id])
                                server.removeTuioObject(tobj);
                            tobjects.Remove(id);
                        }
                    }
            }
            server.commitFrame();
        }

        /// <summary>
        /// Closes the server.
        /// </summary>
        public void close()
        {
            server.close();
        }

        /// <summary>
        /// Resets the server by removing all cursors and objects.
        /// </summary>
        public void reset()
        {
            foreach (int id in tcursors.Keys)
                server.removeTuioCursor(tcursors[id]);

            tcursors.Clear();

            foreach (int id in tobjects.Keys)
                foreach (TuioObject tobj in tobjects[id])
                    server.removeTuioObject(tobj);

            tobjects.Clear();
        }

        /// <summary>
        /// Tries to parse an ip address string.
        /// </summary>
        /// <param name="ipIn">the ip address string to parse</param>
        /// <param name="ipOut">out parameter for the ip address in *.*.*.* format if ipIn is valid and null otherwise</param>
        /// <returns>true iff ipIn is a valid ip address</returns>
        public static bool tryParseIPAddress(String ipIn, out String ipOut)
        {
            IPAddress ipAddress;
            bool result = (IPAddress.TryParse(ipIn, out ipAddress) && ipAddress.AddressFamily == AddressFamily.InterNetwork);
            if (result)
                ipOut = ipAddress.ToString();
            else
                ipOut = null;
            return result;
        }

        /// <summary>
        /// Tries to parse a port string.
        /// </summary>
        /// <param name="portIn">the port string to parse</param>
        /// <param name="portOut">out parameter for the port as an Int16 if portIn is valid and undefined otherwise</param>
        /// <returns>true iff portIn is a valid port</returns>
        public static bool tryParsePort(String portIn, out Int16 portOut)
        {
            return Int16.TryParse(portIn, out portOut);
        }
    }
}