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;
}
