using System;
using System.Drawing;

namespace Server.Engines.Reports
{
  //*********************************************************************
  //
  // Chart Class
  //
  // Base class implementation for BarChart and PieChart
  //
  //*********************************************************************

  public abstract class ChartRenderer
  {
    private const int _colorLimit = 9;

    private Color[] _color =
    {
      Color.Firebrick,
      Color.SkyBlue,
      Color.MediumSeaGreen,
      Color.MediumOrchid,
      Color.Chocolate,
      Color.SlateBlue,
      Color.LightPink,
      Color.LightGreen,
      Color.Khaki
    };

    public ChartItemsCollection DataPoints{ get; set; } = new ChartItemsCollection();

    // Represent collection of all data points for the chart

    // The implementation of this method is provided by derived classes
    public abstract Bitmap Draw();

    public void SetColor(int index, Color NewColor)
    {
      if (index < _colorLimit)
        _color[index] = NewColor;
      else
        throw new Exception("Color Limit is " + _colorLimit);
    }

    public Color GetColor(int index)
    {
      //return _color[index%_colorLimit];

      if (index < _colorLimit) return _color[index];

      return _color[(index + 2) % _colorLimit];
      //throw new Exception("Color Limit is " + _colorLimit);
    }
  }
}