using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace FeatureVectorCalculator
{
    public class SignalChart
    {
        public static Chart GetChart(float[] data, float period, string caption, string captionY, bool fromZero = true,
                                     PointF[] extendedOutliers = null, PointF[] outliers = null)
        {
            Series series1 = null, series2 = null, series3 = null;

            series1 = new Series { Name = caption, ChartArea = "area1", ChartType = SeriesChartType.Line, Color = Color.DeepSkyBlue };
            float minY = float.MaxValue;
            float maxY = float.MinValue;
            for (int x = 0; x < data.Length; x++)
            {
                float y = data[x];
                if (minY > y) minY = y;
                if (maxY < y) maxY = y;
                series1.Points.AddXY(x * period, y);
            }

            if (extendedOutliers != null)
            {
                series2 = new Series { Name = "extended outliers", ChartArea = "area1", ChartType = SeriesChartType.Point, Color = Color.Yellow };
                for (int i = 0; i < extendedOutliers.Length; i++)
                {
                    series2.Points.AddXY(extendedOutliers[i].X * period, extendedOutliers[i].Y);
                }
            }

            if (outliers != null)
            {
                series3 = new Series { Name = "outliers", ChartArea = "area1", ChartType = SeriesChartType.Point, Color = Color.DarkRed };
                for (int i = 0; i < outliers.Length; i++)
                {
                    series3.Points.AddXY(outliers[i].X * period, outliers[i].Y);
                }
            }

            ChartArea chArea = new ChartArea { Name = "area1" };            
            chArea.AxisX.Title = "Time [s]";
            chArea.AxisX.IsLogarithmic = false;
            chArea.AxisX.IsLabelAutoFit = true;
            chArea.AxisX.Minimum = 0;
            chArea.AxisX.Maximum = (data.Length - 1) * period;
            // for (int j = i; j < i + 3; j++)
            // {
            //     CustomLabel cl = new CustomLabel();
            //     cl.Text = string.Format("{0} {1}", xs[j], flowUnit.ToDescription());
            //     cl.FromPosition = Math.Log10(xs[j] * spacer);
            //     cl.ToPosition = Math.Log10(xs[j] / spacer);
            //     chArea.AxisX.CustomLabels.Add(cl);
            // }

            chArea.AxisY.Title = captionY;
            chArea.AxisY.IsLogarithmic = false;
            chArea.AxisY.IsLabelAutoFit = true;
            
            if (!fromZero)
            {
                /// fromZero = false
                chArea.AxisY.IsStartedFromZero = false;
                float diff = maxY - minY;
                chArea.AxisY.Minimum = minY - 0.05 * diff;
                chArea.AxisY.Maximum = maxY + 0.05 * diff;
            }
            else if (minY >= 0)
            {
                /// fromZero = true, All points are above zero
                chArea.AxisY.IsStartedFromZero = true;
                chArea.AxisY.Minimum = 0;
                chArea.AxisY.Maximum = 1.05 * maxY;
            }
            else if (maxY <= 0)
            {
                /// fromZero = true, All points are below zero
                chArea.AxisY.IsStartedFromZero = true;
                chArea.AxisY.Minimum = 1.05 * minY;
                chArea.AxisY.Maximum = 0;
            }
            else
            {
                /// Points are both below and above zero
                chArea.AxisY.IsStartedFromZero = false;
                float diff = maxY - minY;
                chArea.AxisY.Minimum = minY - 0.05 * diff;
                chArea.AxisY.Maximum = maxY + 0.05 * diff;
            }
            
            if (chArea.AxisY.Maximum == chArea.AxisY.Minimum)
            {
                chArea.AxisY.Maximum = chArea.AxisY.Maximum + 1;
            }

            Chart chart = new Chart { Text = caption, Dock = DockStyle.Fill };
            chart.ChartAreas.Add(chArea);
            chart.Series.Add(series1);
            if (series2 != null) chart.Series.Add(series2);
            if (series3 != null) chart.Series.Add(series3);

            return chart;
        }
    }
}