private void UpdateBookDeltas()
{
// clear the list and the counts
BookDeltas.Clear();
if (BooksRead.Count < 1)
{
return;
}
DateTime startDate = BooksRead[0].Date;
// get all the dates a book has been read (after the first quarter)
Dictionary <DateTime, DateTime> bookReadDates = GetBookReadDates(startDate);
// then add the delta made up of the books up to that date
foreach (var date in bookReadDates.Keys.ToList())
{
BooksDelta delta = new BooksDelta(date, startDate);
foreach (var book in BooksRead)
{
if (book.Date <= date)
{
delta.BooksReadToDate.Add(book);
}
else
{
break;
}
}
delta.UpdateTallies();
BookDeltas.Add(delta);
}
}
private void UpdateBookPerYearDeltas()
{
// clear the list and the counts
BookPerYearDeltas.Clear();
if (BooksRead.Count < 1)
{
return;
}
DateTime startDate = BooksRead[0].Date;
startDate = startDate.AddYears(1);
// get all the dates a book has been read that are at least a year since the start
Dictionary <DateTime, DateTime> bookReadDates = new Dictionary <DateTime, DateTime>();
foreach (var book in BooksRead)
{
if (startDate > book.Date)
{
continue;
}
if (!bookReadDates.ContainsKey(book.Date))
{
bookReadDates.Add(book.Date, book.Date);
}
}
// then add the delta made up of the books up to that date
foreach (var date in bookReadDates.Keys.ToList())
{
DateTime startYearDate = date;
startYearDate = startYearDate.AddYears(-1);
BooksDelta delta = new BooksDelta(date, startYearDate);
foreach (var book in BooksRead)
{
if (book.Date < startYearDate)
{
continue;
}
if (book.Date <= date)
{
delta.BooksReadToDate.Add(book);
}
else
{
break;
}
}
delta.UpdateTallies();
BookPerYearDeltas.Add(delta);
}
}
