using System;
using System.Collections.Generic;
using CPF.Drawing;

namespace CPF.ReoGrid.Chart
{
	public class PieChart : Chart
	{
		internal virtual PieChartDataInfo DataInfo { get; private set; }

		internal virtual List<float> PlotPieAngles { get; private set; }

		internal virtual PiePlotView PiePlotView { get; private set; }

		public PieChart()
		{
			this.DataInfo = new PieChartDataInfo();
			this.PlotPieAngles = new List<float>();
			this.AddPlotViewLayer(this.PiePlotView = this.CreatePlotViewInstance());
		}

		protected override ChartLegend CreateChartLegend(LegendType type)
		{
			ChartLegend chartLegend = base.CreateChartLegend(type);
			bool flag = type == LegendType.PrimaryLegend;
			if (flag)
			{
				chartLegend.LegendPosition = LegendPosition.Bottom;
			}
			return chartLegend;
		}

		protected virtual PiePlotView CreatePlotViewInstance()
		{
			return new PiePlotView(this);
		}

		protected override Rect GetPlotViewBounds(Rect bodyBounds)
		{
			float num = Math.Min(bodyBounds.Width, bodyBounds.Height);
			float num2 = bodyBounds.X + (bodyBounds.Width - num) / 2f;
			float num3 = bodyBounds.Y + (bodyBounds.Height - num) / 2f;
			return new Rect(ref num2, ref num3, ref num, ref num);
		}

		protected override void UpdatePlotData()
		{
			WorksheetChartDataSource dataSource = this.DataSource;
			bool flag = dataSource == null;
			if (!flag)
			{
				double num = 0.0;
				bool flag2 = dataSource != null && dataSource.SerialCount > 0;
				if (flag2)
				{
					for (int i = 0; i < dataSource.SerialCount; i++)
					{
						double? num2 = dataSource[i][0];
						bool flag3 = num2 != null;
						if (flag3)
						{
							num += num2.Value;
						}
					}
				}
				this.DataInfo.Total = num;
				this.UpdatePlotPoints();
			}
		}

		protected virtual void UpdatePlotPoints()
		{
			WorksheetChartDataSource dataSource = this.DataSource;
			bool flag = dataSource != null;
			if (flag)
			{
				int serialCount = dataSource.SerialCount;
				Rect clientBounds = this.ClientBounds;
				float num = (float)(360.0 / this.DataInfo.Total);
				for (int i = 0; i < serialCount; i++)
				{
					double? num2 = dataSource[i][0];
					bool flag2 = num2 != null;
					if (flag2)
					{
						float num3 = (float)(num2 * (double)num).Value;
						bool flag3 = i >= this.PlotPieAngles.Count;
						if (flag3)
						{
							this.PlotPieAngles.Add(num3);
						}
						else
						{
							this.PlotPieAngles[i] = num3;
						}
					}
				}
			}
			else
			{
				this.PlotPieAngles.Clear();
			}
			bool flag4 = this.PiePlotView != null;
			if (flag4)
			{
				this.PiePlotView.Invalidate();
			}
		}
	}
}