//
// PeerGraph.cs
//
// Author:
//       Carsten Sonne Larsen <cs@innolan.dk>
//
// Copyright (c) 2013 Carsten Sonne Larsen
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using NPlot;
using Ntp.Analyzer.Data;
using Ntp.Analyzer.Objects;
using Ntp.Analyzer.Config.Graph;
using Ntp.Analyzer.Graph.Interface;
using Ntp.Analyzer.Data.Static;

namespace Ntp.Analyzer.Graph
{
    public sealed class PeerGraph : DispersionGraph
    {
        private readonly List<Double> balance = new List<Double> ();
        private readonly IPeerGraphConfiguration config;
        private readonly List<Double> delay = new List<Double> ();
        private readonly Host host;
        private readonly Peer peer;
        private readonly Dictionary<DateTime, HostReading> timedReading;

        public PeerGraph (IPeerGraphConfiguration configuratation, Host host, Peer peer)
            : base(configuratation)
        {
            config = configuratation;
            this.host = host;
            this.peer = peer;

            timedReading = new Dictionary<DateTime, HostReading> ();
        }

        protected override string YLabel {
            get { return "Milliseconds"; }
        }

        protected override void LoadData ()
        {
            FilteredMapper<PeerReading> peerMapper = DataFace.Instance.PeerReadings;
            peerMapper.FilterHost = host;
            peerMapper.FilterPeer = peer;
            peerMapper.FilterTime = DateTime.Now.Subtract (GraphTimeSpan);

            if (config.Balance == 0.0) {
                foreach (PeerReading reading in peerMapper) {
                    Time.Add (reading.Time);
                    Offset.Add (reading.Offset * config.Offset);
                    Jitter.Add (reading.Jitter * config.Jitter);
                    delay.Add (reading.Delay * config.Delay);
                    balance.Add (0);
                }
            } else {
                FilteredMapper<HostReading> hostMapper = DataFace.Instance.HostReadings;
                hostMapper.FilterHost = host;
                hostMapper.FilterTime = DateTime.Now.Subtract (GraphTimeSpan);

                // Prepare balance data
                foreach (HostReading hostReading in hostMapper) {
                    if (!timedReading.ContainsKey (hostReading.RoundedTime))
                        timedReading.Add (hostReading.RoundedTime, hostReading);
                }

                // Add
                foreach (PeerReading reading in peerMapper) {
                    Time.Add (reading.RoundedTime);
                    Offset.Add (reading.Offset * config.Offset);
                    Jitter.Add (reading.Jitter * config.Jitter);
                    delay.Add (reading.Delay * config.Delay);

                    if (timedReading.ContainsKey (reading.RoundedTime)) {
                        balance.Add (reading.Offset - timedReading [reading.RoundedTime].Offset * 1000);
                    } else {
                        balance.Add (0);
                    }
                }
            }

            if (config.FilterFactor != 0.0)
                CleanSeries ();
        }

        protected override void AddPlots ()
        {
            base.AddPlots ();

            if (config.Delay != 0.0) {
                LinePlot delayPlot = SetupPlot ("Delay", Color.DarkOrange, Time, delay);
                Surface.Add (delayPlot, PlotSurface2D.XAxisPosition.Bottom, PlotSurface2D.YAxisPosition.Left);
            }

            if (config.Balance != 0.0) {
                LinePlot balancePlot = SetupPlot ("Balanced offset", Color.DarkViolet, Time, balance);
                Surface.Add (balancePlot, PlotSurface2D.XAxisPosition.Bottom, PlotSurface2D.YAxisPosition.Left);
            }
        }

        protected override void PreRender ()
        {
            base.PreRender ();

            Surface.Title = config.GetTitle (peer);
        }

        /// <summary>
        /// Cleans the value series from values out side boundaries.
        /// </summary>
        private void CleanSeries ()
        {
            double totalOffset = 0.0;
            double totalJitter = 0.0;
            double totalDelay = 0.0;
            double totalBalance = 0.0;

            // Calculate mean value
            for (int i = 0; i < Time.Count; i++) {
                totalOffset += Math.Abs (Offset [i]);
                totalJitter += Math.Abs (Jitter [i]);
                totalDelay += Math.Abs (delay [i]);
                totalBalance += Math.Abs (balance [i]);
            }

            double avgOffset = totalOffset / Time.Count;
            double avgJitter = totalJitter / Time.Count;
            double avgDelay = totalDelay / Time.Count;
            double avgBalance = totalBalance / Time.Count;

            List<Int32> indexes = new List<Int32> ();

            // Find invalid values
            for (int i = 0; i < Time.Count; i++) {
                if (Math.Abs (Offset [i]) > avgOffset * config.FilterFactor ||
                    Math.Abs (Jitter [i]) > avgJitter * config.FilterFactor ||
                    Math.Abs (delay [i]) > avgDelay * config.FilterFactor ||
                    Math.Abs (balance [i]) > avgBalance * config.FilterFactor) {
                    indexes.Add (i);
                }
            }

            // Remove invalid values
            for (int i = indexes.Count - 1; i >= 0; i--) {
                Time.RemoveAt (indexes [i]);
                Offset.RemoveAt (indexes [i]);
                Jitter.RemoveAt (indexes [i]);
                delay.RemoveAt (indexes [i]);
                balance.RemoveAt (indexes [i]);
            }
        }
    }
}