public static List <YearlyTally> GetYearlyTalliesForBooks(List <BookRead> allBooks)
{
List <BookRead> sortedBooks = allBooks.OrderBy(x => x.Date).ToList();
DateTime firstDay = sortedBooks.First().Date;
int totalDays = 1 + (int)(sortedBooks.Last().Date - firstDay).TotalDays;
YearlyTally[] yearlyTallies = new YearlyTally[totalDays];
for (int i = 0; i < totalDays; i++)
{
yearlyTallies[i] = new YearlyTally(firstDay, i);
}
YearlyTally currentTally = new YearlyTally();
// fill in the days with books
Dictionary <int, int> updatedDays = new Dictionary <int, int>();
foreach (BookRead book in allBooks)
{
int daysSinceStart = (int)(book.Date - firstDay).TotalDays;
currentTally.TotalPages += book.Pages;
currentTally.TotalBooks++;
if (book.OriginalLanguage == EnglishLanguage)
{
currentTally.TotalBooksInEnglish++;
}
if (book.Format == BookFormat.Book)
{
currentTally.TotalBookFormat++;
}
if (book.Format == BookFormat.Comic)
{
currentTally.TotalComicFormat++;
}
if (book.Format == BookFormat.Audio)
{
currentTally.TotalAudioFormat++;
}
yearlyTallies[daysSinceStart].UpdateTotalsSinceStart(currentTally);
if (!updatedDays.ContainsKey(daysSinceStart))
{
updatedDays.Add(daysSinceStart, daysSinceStart);
}
}
// fill in the missing days with the totals for the day before
for (int i = 1; i < totalDays; i++)
{
if (updatedDays.ContainsKey(i))
{
continue;
}
yearlyTallies[i].UpdateTotalsSinceStart(yearlyTallies[i - 1]);
}
for (int i = DaysPerYear; i < totalDays; i++)
{
var previousYearTally = yearlyTallies[i - DaysPerYear];
yearlyTallies[i].UpdateTotalsYearDelta(previousYearTally);
}
return(yearlyTallies.ToList());
}
