private static List<FoodSchedule> schedule(
List<String> breakfastParticipants,
List<String> snackParticipants,
List<DateTime> fridaysAvailable) {
// shuffle both lists
Collections.shuffle(breakfastParticipants);
List<String> modifiableBreakfast = new ArrayList<String>(breakfastParticipants);
Collections.shuffle(snackParticipants);
List<String> modifiableSnack = new ArrayList<String>(snackParticipants);
// while not empty, schedule
int participantCount = breakfastParticipants.size();
List<FoodSchedule> schedule = new ArrayList<FoodSchedule>();
for (int i = 0; i < participantCount; i += 2) {
String bp1 = modifiableBreakfast.remove(0);
String bp2 = modifiableBreakfast.remove(0);
String sp1 = modifiableSnack.remove(0);
String sp2 = modifiableSnack.remove(0);
DateTime friday = fridaysAvailable.remove(0);
FoodSchedule fs = new FoodSchedule();
fs.setDateTime(friday);
fs.setBreakfastParticipantIds(Arrays.asList(bp1, bp2));
fs.setSnackParticipantIds(Arrays.asList(sp1, sp2));
schedule.add(fs);
}
return schedule;
}
private static void transposeList(List<FoodSchedule> schedule, int transpose) {
// Get date from first event
FoodSchedule foodSchedule = schedule.get(0);
DateTime dateTime = foodSchedule.getDateTime();
// we need at least as many fridays as are scheduled
int minFridays = schedule.size();
int year = dateTime.getYear();
String lastDate = "31/12/" + year;
// Get fridays and remove count
String startDate = dateTime.toString(FridayFinder.DATE_PATTERN);
List<DateTime> fridaysOfYear = FridayFinder.getFridays(startDate, lastDate);
// check that fridays is at least minFridays+transpose
if (fridaysOfYear.size() < minFridays + transpose) {
// add a new year
DateTime lastDayOfCurrYear = FridayFinder.DATE_PATTERN.parseDateTime(lastDate);
DateTime firstDayNextYear = lastDayOfCurrYear.plusDays(1);
DateTime nextYearLastDay = lastDayOfCurrYear.plusYears(1);
// get new list and add all
fridaysOfYear.addAll(FridayFinder.getFridays(firstDayNextYear, nextYearLastDay));
}
for (int i = 0; i < transpose; i++) {
fridaysOfYear.remove(0);
}
// rebuild participant list
for (int i = 0; i < schedule.size(); i++) {
FoodSchedule fs = schedule.get(i);
fs.setDateTime(fridaysOfYear.get(i));
}
}
