first commit

Core/Calculation/DataProcessing.cs

@@ -0,0 +1,20 @@
+using Core.Entities;
+
+namespace Core.Calculation;
+
+public class DataProcessing
+{
+	public static EventStudentPicks[] GetEventStudentPicks(IList<CompetitiveEvent> events, IList<Student> students)
+	{
+		return
+			students.SelectMany(
+					student => student.RankedEventPicks.Select((e, i) => (e, student, i + 1)))
+				.OrderBy(tuple => tuple.Item3)
+					.ThenByDescending(tuple => tuple.student.Grade + tuple.student.TsaYear)
+				.GroupBy(tuple => tuple.e)
+				.OrderBy(tuples => tuples.Key.Name)
+				.Select(tuples =>
+					new EventStudentPicks(tuples.Key, tuples.Select(tuple => Tuple.Create(tuple.student, tuple.Item3)).ToList())
+				).ToArray();
+	}
+}