/// <summary>
/// Reorder the ItemProperties collection so that the ungrouped properties come first,
/// followed by the grouped properties.
/// If a group contains multiple series, the properties from those series are interleaved
/// with each other.
/// </summary>
/// <returns></returns>
public PivotedProperties ReorderItemProperties()
{
var groupedPropertyIndexes = SeriesGroups
.SelectMany(group => group.SeriesList.SelectMany(series => series.PropertyIndexes)).ToHashSet();
var newOrder = new List <int>();
newOrder.AddRange(Enumerable.Range(0, ItemProperties.Count).Where(i => !groupedPropertyIndexes.Contains(i)));
newOrder.AddRange(SeriesGroups.SelectMany(group =>
Enumerable.Range(0, group.PivotKeys.Count)
.SelectMany(i => group.SeriesList.Select(series => series.PropertyIndexes[i]))));
var newNumbering = new int[newOrder.Count];
for (int i = 0; i < newOrder.Count; i++)
{
newNumbering[newOrder[i]] = i;
}
var newItemProperties = new ItemProperties(newOrder.Select(i => ItemProperties[i]));
var result = new PivotedProperties(newItemProperties, SeriesGroups.Select(group => group.RenumberProperties(newItemProperties, newNumbering)));
#if DEBUG
Debug.Assert(ItemProperties.ToHashSet().SetEquals(result.ItemProperties.ToHashSet()));
Debug.Assert(SeriesGroups.Count == result.SeriesGroups.Count);
for (int iGroup = 0; iGroup < SeriesGroups.Count; iGroup++)
{
Debug.Assert(SeriesGroups[iGroup].SeriesList.Count == result.SeriesGroups[iGroup].SeriesList.Count);
Debug.Assert(SeriesGroups[iGroup].PivotKeys.SequenceEqual(result.SeriesGroups[iGroup].PivotKeys));
for (int iSeries = 0; iSeries < SeriesGroups[iGroup].SeriesList.Count; iSeries++)
{
var resultSeries = result.SeriesGroups[iGroup].SeriesList[iSeries];
Debug.Assert(resultSeries.PropertyIndexes.OrderBy(i => i).SequenceEqual(resultSeries.PropertyIndexes));
var series = SeriesGroups[iGroup].SeriesList[iSeries];
Debug.Assert(series.PropertyIndexes.Select(i => ItemProperties[i])
.SequenceEqual(resultSeries.PropertyIndexes.Select(i => result.ItemProperties[i])));
}
}
#endif
return(result);
}