using System;
using CPF.Drawing;
using CPF.ReoGrid.Common;
using CPF.ReoGrid.Drawing;
using CPF.ReoGrid.Rendering;

namespace CPF.ReoGrid.Chart
{
	public class ChartLegend : DrawingComponent
	{
		public virtual IChart Chart { get; protected set; }

		public ChartLegend(IChart chart)
		{
			this.Chart = chart;
			base.LineColor = Color.Transparent;
			base.FillColor = Color.Transparent;
			this.FontSize *= 0.8f;
		}

		public LegendType LegendType { get; set; }

		public LegendPosition LegendPosition
		{
			get
			{
				return this.legendPosition;
			}
			set
			{
				bool flag = this.legendPosition != value;
				if (flag)
				{
					this.legendPosition = value;
					bool flag2 = this.Chart is Chart;
					if (flag2)
					{
						Chart chart = (Chart)this.Chart;
						chart.DirtyLayout();
					}
				}
			}
		}

		protected virtual Size GetSymbolSize(int index)
		{
			float num = 14f;
			float num2 = 14f;
			return new Size(ref num, ref num2);
		}

		protected virtual Size GetLabelSize(int index)
		{
			WorksheetChartDataSource dataSource = this.Chart.DataSource;
			bool flag = dataSource == null;
			Size result;
			if (flag)
			{
				result = default(Size);
			}
			else
			{
				string label = dataSource[index].Label;
				result = DrawingFactory.Default.MeasureString(label, ResourcePoolManager.CreateFont(this.FontName, (double)this.FontSize, PlatformUtility.ToWPFFontStyle(this.FontStyles)));
			}
			return result;
		}

		public override Size GetPreferredSize()
		{
			return this.layoutedSize;
		}

		public virtual void MeasureSize(Rect parentClientRect)
		{
			WorksheetChartDataSource dataSource = this.Chart.DataSource;
			bool flag = dataSource == null;
			if (!flag)
			{
				int serialCount = dataSource.SerialCount;
				this.Children.Clear();
				float num = 0f;
				float num2 = 0f;
				float num3 = 0f;
				float num4 = 0f;
				float num5;
				for (int i = 0; i < serialCount; i++)
				{
					ChartLegendItem chartLegendItem = new ChartLegendItem(this, i);
					Size symbolSize = this.GetSymbolSize(i);
					bool flag2 = num < symbolSize.Width;
					if (flag2)
					{
						num = symbolSize.Width;
					}
					bool flag3 = num2 < symbolSize.Height;
					if (flag3)
					{
						num2 = symbolSize.Height;
					}
					ChartLegendItem chartLegendItem2 = chartLegendItem;
					num5 = 0f;
					float num6 = 0f;
					Point point = new Point(ref num5, ref num6);
					chartLegendItem2.SymbolBounds = new Rect(ref point, ref symbolSize);
					Size labelSize = this.GetLabelSize(i);
					labelSize.Width += 6f;
					bool flag4 = num3 < labelSize.Width;
					if (flag4)
					{
						num3 = labelSize.Width;
					}
					bool flag5 = num4 < labelSize.Height;
					if (flag5)
					{
						num4 = labelSize.Height;
					}
					ChartLegendItem chartLegendItem3 = chartLegendItem;
					num5 = 0f;
					num6 = 0f;
					point = new Point(ref num5, ref num6);
					chartLegendItem3.LabelBounds = new Rect(ref point, ref labelSize);
					this.Children.Add(chartLegendItem);
				}
				float num7 = num + 4f + num3;
				float num8 = Math.Max(num2, num4);
				Rect rect = parentClientRect;
				float num9 = 0f;
				float num10 = 0f;
				float num11 = 0f;
				float num12 = 0f;
				for (int j = 0; j < serialCount; j++)
				{
					ChartLegendItem chartLegendItem4 = this.Children[j] as ChartLegendItem;
					bool flag6 = chartLegendItem4 != null;
					if (flag6)
					{
						chartLegendItem4.SetSymbolLocation(0f, (num8 - chartLegendItem4.SymbolBounds.Height) / 2f);
						chartLegendItem4.SetLabelLocation(num + 4f, (num8 - chartLegendItem4.LabelBounds.Height) / 2f);
						chartLegendItem4.Bounds = new Rect(ref num9, ref num10, ref num7, ref num8);
						bool flag7 = num11 < chartLegendItem4.Right;
						if (flag7)
						{
							num11 = chartLegendItem4.Right;
						}
						bool flag8 = num12 < chartLegendItem4.Bottom;
						if (flag8)
						{
							num12 = chartLegendItem4.Bottom;
						}
					}
					num9 += num7;
					bool flag9 = this.LegendPosition == LegendPosition.Left || this.LegendPosition == LegendPosition.Right;
					if (flag9)
					{
						num9 = 0f;
						num10 += num8 + 10f;
					}
					else
					{
						num9 += 10f;
						bool flag10 = num9 > rect.Width;
						if (flag10)
						{
							num9 = 0f;
							num10 += num8 + 10f;
						}
					}
				}
				num5 = num11 + 10f;
				this.layoutedSize = new Size(ref num5, ref num12);
			}
		}

		private LegendPosition legendPosition;

		private Size layoutedSize;
	}
}