using System;
using System.Collections.Generic;
using System.Text;
using FastReport.DataVisualization.Charting;

namespace FastReport.MSChart
{
    internal class DataPointComparer : IComparer<DataPoint>
    {
        private SortBy sortBy;
        private ChartSortOrder sortOrder;

        public int Compare(DataPoint x, DataPoint y)
        {
            int result = 0;
            IComparable i1;
            IComparable i2;

            if (sortBy == SortBy.XValue)
            {
                if (!String.IsNullOrEmpty(x.AxisLabel))
                {
                    i1 = x.AxisLabel as IComparable;
                    i2 = y.AxisLabel as IComparable;
                }
                else
                {
                    i1 = x.XValue as IComparable;
                    i2 = y.XValue as IComparable;
                }
            }
            else
            {
                i1 = x.YValues[0] as IComparable;
                i2 = y.YValues[0] as IComparable;
            }

            if (i1 != null)
                result = i1.CompareTo(i2);
            else if (i2 != null)
                result = -1;
            if (sortOrder == ChartSortOrder.Descending)
                result = -result;

            return result;
        }

        public DataPointComparer(SortBy sortBy, ChartSortOrder sortOrder)
        {
            this.sortBy = sortBy;
            this.sortOrder = sortOrder;
        }
    }
}