using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using RealTimeGraphX.EventArguments;

namespace RealTimeGraphX
{
    /// <summary>
    /// Represents an <see cref="IGraphController{XDataPoint, YDataPoint}"/> base class.
    /// </summary>
    /// <typeparam name="TDataSeries">The type of the graph data series.</typeparam>
    /// <typeparam name="XDataPoint">The type of the x-axis data point.</typeparam>
    /// <typeparam name="YDataPoint">The type of the y-axis data point.</typeparam>
    /// <seealso cref="RealTimeGraphX.GraphOutputComponentBase{RealTimeGraphX.IGraphRenderer{XDataPoint, YDataPoint}}" />
    /// <seealso cref="RealTimeGraphX.IGraphController{XDataPoint, YDataPoint}" />
    public abstract class GraphControllerBase<TDataSeries, XDataPoint, YDataPoint> :
        GraphOutputComponentBase<IGraphRenderer<TDataSeries, XDataPoint, YDataPoint>>,
        IGraphController<TDataSeries, XDataPoint, YDataPoint>
        where XDataPoint : GraphDataPointBase
        where YDataPoint : GraphDataPointBase
        where TDataSeries : IGraphDataSeries
    {
        #region Events

        /// <summary>
        /// Occurs when one of the <see cref="P:RealTimeGraphX.IGraphController`2.Range" /> properties was modified.
        /// </summary>
        public event EventHandler<GraphRange<XDataPoint, YDataPoint>> RangeChanged;

        /// <summary>
        /// Occurs when one of the <see cref="Range" /> properties was modified.
        /// </summary>
        event EventHandler<IGraphRange> IGraphController<TDataSeries>.RangeChanged
        {
            add
            {
                RangeChanged += new EventHandler<GraphRange<XDataPoint, YDataPoint>>((sender, range) => { value.Invoke(sender, Range); });
            }

            remove
            {
                RangeChanged -= new EventHandler<GraphRange<XDataPoint, YDataPoint>>((sender, range) => { value.Invoke(sender, Range); });
            }
        }

        /// <summary>
        /// Occurs when the connected <see cref="IGraphRenderer"/> has changed.
        /// </summary>
        event EventHandler<OutputChangedEventArgs<IGraphRenderer<TDataSeries>>> IGraphOutputComponent<IGraphRenderer<TDataSeries>>.OutputChanged
        {
            add
            {
                OutputChanged += new EventHandler<OutputChangedEventArgs<IGraphRenderer<TDataSeries,XDataPoint, YDataPoint>>>((sender, output) => { value.Invoke(sender, new OutputChangedEventArgs<IGraphRenderer<TDataSeries>>(output.Output)); });
            }

            remove
            {
                OutputChanged -= new EventHandler<OutputChangedEventArgs<IGraphRenderer<TDataSeries,XDataPoint, YDataPoint>>>((sender, output) => { value.Invoke(sender, new OutputChangedEventArgs<IGraphRenderer<TDataSeries>>(output.Output)); });
            }
        }

        #endregion

        #region Properties



        /// <summary>
        /// Gets the data series collection.
        /// </summary>
        public ReadOnlyObservableCollection<TDataSeries> DataSeriesCollection { get; private set; }

        /// <summary>
        /// Gets the graph range (limits).
        /// </summary>
        public GraphRange<XDataPoint, YDataPoint> Range { get; private set; }

        /// <summary>
        /// Gets the graph range (limits).
        /// </summary>
        IGraphRange IGraphController<TDataSeries>.Range
        {
            get
            {
                return Range;
            }
        }

        /// <summary>
        /// Gets the connected output <see cref="IGraphRenderer"/>.
        /// </summary>
        IGraphRenderer<TDataSeries> IGraphOutputComponent<IGraphRenderer<TDataSeries>>.Output
        {
            get
            {
                return Output;
            }
        }

        private bool _isPaused;
        /// <summary>
        /// Gets or sets a value indicating whether to pause the graph movement.
        /// </summary>
        public bool IsPaused
        {
            get { return _isPaused; }
            set
            {
                _isPaused = value; RaisePropertyChangedAuto();

                if (Output != null)
                {
                    Output.IsPaused = value;
                }
            }
        }

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="GraphControllerBase{XDataPoint, YDataPoint}"/> class.
        /// </summary>
        public GraphControllerBase()
        {
            DataSeriesCollection = new ReadOnlyObservableCollection<TDataSeries>(new ObservableCollection<TDataSeries>());
            Range = new GraphRange<XDataPoint, YDataPoint>();
            Range.PropertyChanged += (x, e) => OnRangeChanged();
        }

        #endregion

        #region Public Methods

        /// <summary>
        /// Clears the graph data.
        /// </summary>
        public void Clear()
        {
            if (Output != null)
            {
                Output.Clear();
            }
        }

        /// <summary>
        /// Submits a matrix of x and y data points. Meaning each data series should process a single collection of x/y data points.
        /// </summary>
        /// <param name="xxxx">X matrix.</param>
        /// <param name="yyyy">Y matrix.</param>
        public void PushData(IEnumerable<IEnumerable<XDataPoint>> xxxx, IEnumerable<IEnumerable<YDataPoint>> yyyy)
        {
            if (DataSeriesCollection.Count == 0) return;

            Output.Render(DataSeriesCollection, xxxx, yyyy);
        }

        /// <summary>
        /// Submits the specified collections of x and y data points.
        /// If the controller has more than one data series the data points will be distributed evenly.
        /// </summary>
        /// <param name="xx">X data point collection.</param>
        /// <param name="yy">Y data point collection.</param>
        public void PushData(IEnumerable<XDataPoint> xx, IEnumerable<YDataPoint> yy)
        {
            if (DataSeriesCollection.Count == 0) return;

            var xList = xx.ToList();
            var yList = yy.ToList();

            List<List<XDataPoint>> xxList = new List<List<XDataPoint>>();
            List<List<YDataPoint>> yyList = new List<List<YDataPoint>>();

            foreach (var series in DataSeriesCollection.ToList())
            {
                xxList.Add(new List<XDataPoint>());
                yyList.Add(new List<YDataPoint>());
            }

            int counter = 0;

            for (int i = 0; i < xList.Count; i++)
            {
                xxList[counter].Add(xList[i]);
                yyList[counter].Add(yList[i]);

                counter++;

                if (counter >= xxList.Count)
                {
                    counter = 0;
                }
            }

            Output.Render(DataSeriesCollection, xxList, yyList);
        }

        /// <summary>
        /// Submits the specified x and y data points the controller.
        /// If the controller has more than one data series the data points will be duplicated.
        /// </summary>
        /// <param name="x">X data point.</param>
        /// <param name="y">Y data point.</param>
        public void PushData(XDataPoint x, YDataPoint y)
        {
            if (DataSeriesCollection.Count == 0) return;

            List<List<XDataPoint>> xxList = new List<List<XDataPoint>>();
            List<List<YDataPoint>> yyList = new List<List<YDataPoint>>();

            foreach (var series in DataSeriesCollection.ToList())
            {
                xxList.Add(new List<XDataPoint>() { x });
                yyList.Add(new List<YDataPoint>() { y });
            }

            Output.Render(DataSeriesCollection, xxList, yyList);
        }

        /// <summary>
        /// Adds a new data series.
        /// </summary>
        /// <param name="series">The series.</param>
        public void AddDataSeries(TDataSeries series)
        {
            var current_collection = DataSeriesCollection.ToList();
            current_collection.Add(series);
            DataSeriesCollection = new ReadOnlyObservableCollection<TDataSeries>(new ObservableCollection<TDataSeries>(current_collection));
        }

        /// <summary>
        /// Removed the specified data series
        /// </summary>
        /// <param name="series">The series.</param>
        public void RemoveDataSeries(TDataSeries series)
        {
            var current_collection = DataSeriesCollection.ToList();
            current_collection.Remove(series);
            DataSeriesCollection = new ReadOnlyObservableCollection<TDataSeries>(new ObservableCollection<TDataSeries>(current_collection));
        }

        /// <summary>
        /// Connects this controller to the specified <see cref="IGraphRenderer{XDataPoint, YDataPoint}"/>.
        /// </summary>
        /// <param name="renderer">The renderer.</param>
        /// <param name="fromOutput">Specifies whether this call was made from an <see cref="IGraphRenderer{XDataPoint, YDataPoint}"/> component.</param>
        public override void ConnectOutput(IGraphRenderer<TDataSeries, XDataPoint, YDataPoint> renderer, bool fromOutput = false)
        {
            renderer.ThrowIfNull("Cannot connect a null renderer.");

            Output = renderer;

            if (!fromOutput)
            {
                Output.ConnectInput(this, true);
            }
        }

        /// <summary>
        /// Disconnects this component from the connected <see cref="P:RealTimeGraphX.IGraphOutputComponent`1.Output" /><see cref="T:RealTimeGraphX.IGraphComponent" />.
        /// </summary>
        /// <param name="fromOutput">Specifies whether this call was made from an <see cref="IGraphRenderer{XDataPoint, YDataPoint}"/> component.</param>
        public override void DisconnectOutput(bool fromOutput = false)
        {
            if (Output != null)
            {
                if (!fromOutput)
                {
                    (Output as IGraphInputComponent<IGraphController<TDataSeries, XDataPoint, YDataPoint>>).DisconnectInput(true);
                }

                Output = null;
            }
        }

        /// <summary>
        /// Connects this controller to the specified <see cref="IGraphRenderer"/>.
        /// </summary>
        /// <param name="renderer">The renderer.</param>
        /// <param name="fromOutput">Specifies whether this call was made from the output <see cref="IGraphRenderer"/>.</param>
        void IGraphOutputComponent<IGraphRenderer<TDataSeries>>.ConnectOutput(IGraphRenderer<TDataSeries> renderer, bool fromOutput)
        {
            ConnectOutput(renderer as IGraphRenderer<TDataSeries,XDataPoint, YDataPoint>);
        }

        /// <summary>
        /// Disconnects the current connected output <see cref="IGraphRenderer"/>.
        /// </summary>
        /// <param name="fromOutput">Specifies whether this call was made from the output <see cref="IGraphRenderer"/>.</param>
        void IGraphOutputComponent<IGraphRenderer<TDataSeries>>.DisconnectOutput(bool fromOutput)
        {
            DisconnectOutput();
        }

        #endregion

        #region Protected Methods

        /// <summary>
        /// Raises the <see cref="RangeChanged"/> event.
        /// </summary>
        protected virtual void OnRangeChanged()
        {
            RangeChanged?.Invoke(this, Range);
        }

        



        #endregion
    }
}