swiss-backend/src/main/java/nl/connectedit/swiss/domain/StandingsEntry.java

package nl.connectedit.swiss.domain;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import nl.connectedit.swiss.domain.entity.Team;

@Getter
@Setter
@ToString
public class StandingsEntry {

  public StandingsEntry(Team team) {
    this.team = team;
  }

  private Long position;

  private Team team;

  private Long played = 0L;

  private Long won = 0L;

  private Long lost = 0L;

  private Long points = 0L;

  private Long gamesWon = 0L;

  private Long gamesLost = 0L;

  private Long pointsWon = 0L;

  private Long pointsLost = 0L;

  public static int compare(StandingsEntry s1, StandingsEntry s2) {
    var pointsPerMatchS1 = safeDivide(s1.points, s1.played);
    var pointsPerMatchS2 = safeDivide(s2.points, s2.played);
    if (pointsPerMatchS1 > pointsPerMatchS2) {
      return -1;
    } else if (pointsPerMatchS1 < pointsPerMatchS2) {
      return 1;
    } else {
      if (s1.played < s2.played) {
        return -1;
      } else if (s1.played > s2.played) {
        return 1;
      } else {
        var gamesPerMatchS1 = safeDivide(s1.gamesWon - s1.gamesLost, s1.played);
        var gamesPerMatchS2 = safeDivide(s2.gamesWon - s2.gamesLost, s2.played);
        if (gamesPerMatchS1 > gamesPerMatchS2) {
          return -1;
        } else if (gamesPerMatchS1 < gamesPerMatchS2) {
          return 1;
        } else {
          var ptsPerMatchS1 = safeDivide(s1.pointsWon - s1.pointsLost, s1.played);
          var ptsPerMatchS2 = safeDivide(s2.pointsWon - s2.pointsLost, s2.played);
          return Double.compare(ptsPerMatchS2, ptsPerMatchS1);
        }
      }
    }
  }

  private static double safeDivide(Long a, Long b) {
    return (a == 0 && b == 0) ? 0 : (double) a / b;
  }
}