// feve5814@student.su.se || jaha4972@student.su.se || doha6991@student.su.se

import java.util.*;


public class Register {
    private Scanner keyboard = new Scanner(System.in);


    private List<Event> eventList = new ArrayList<>();
    private List<Participant> participantList = new ArrayList<>();

    private int participantNumber = 99;


    private String readCommand() {

        System.out.println("Vad vill du göra?\n 1: Lägga till gren\n 2: Registrera ny deltagare\n 3: Ta bort deltagare\n 4: Registrera resultat\n 5: Se resultatlista för deltagare\n 6: Se resultatlista för specifik gren\n 7: Skicka meddelande\n 8: Avsluta");
        return inputStrings("Skriv ditt val här: ");
    }

    private boolean useCommand(String command) {

        switch (command) {
            case "1":
            case "Add event":
                addEvent();
                break;
            case "2":
            case "Add participant":
                addParticipant();
                break;
            case "3":
            case "Remove participant":
                removeParticipant();
                break;
            case "4":
            case "Add result":
                addResult();
                break;
            case "5":
            case "Participant":
                viewParticipant();
                break;
            case "7":
                System.out.println(eventList);
                System.out.println(participantList);
                break;
            case "Exit":
                System.out.println("Program closing, goodbye!");
                return false;

            default:
                if (command.startsWith("Message")) {
                    message(command);
                } else if (eventExistsStartMenu(command)) {
                    viewEvent(command);
                }else{
                    System.out.println("Error, wrong command");
                }
        }
        return true;
    }

    private void addEvent() {

        String eventNameTemp = inputStrings("Event name: ");
        while(eventNameTemp.trim().isEmpty() || eventNameTemp.isEmpty()){
            System.out.println("Error: name can't be empty");
            eventNameTemp = inputStrings("Event name: ");
        }
        boolean eventAlreadyExists = false;

        for (Event e : eventList){
            if (eventNameTemp.equals(e.getEventName())){
                eventAlreadyExists = true;
                break;
            }
        }
        if(eventAlreadyExists){
            System.out.println("Error: "+ eventNameTemp + " has already been added");
        }else{
            int attemptsAllowedTemp = inputInts("Attempts allowed: ");
            while (attemptsAllowedTemp <= 0){
                System.out.println("Error: too low, must allow at least one attempt");
                attemptsAllowedTemp = inputInts("Attempts allowed: ");
            }
            System.out.println(eventNameTemp + " with " + attemptsAllowedTemp + " attempts allowed created");
            eventList.add(new Event(eventNameTemp,attemptsAllowedTemp));
        }

    }

    private void addParticipant() {

        String firstName = inputStrings("First name: ");
        while (firstName.trim().isEmpty()) {
            System.out.println("Error: name can't be empty!");
            firstName = inputStrings("First name: ");
        }


        String lastName = inputStrings("Last name: ");
        while (lastName.trim().isEmpty()) {
            System.out.println("Error: name can't be empty!");
            lastName = inputStrings("Last name: ");
        }


        String team = inputStrings("Team: ");
        while (team.trim().isEmpty()) {
            System.out.println("Error: name can't be emtpy!");
            team = inputStrings("Team: ");
        }

        participantNumber++;

        participantList.add(new Participant(firstName, lastName, team, participantNumber));

        System.out.println(participantList.get(participantList.size() - 1) + " added");

    }

    private void removeParticipant() {

        int participantToDelete = inputInts("Number: ");
        if(checkParticipantForRemoval(participantToDelete)){
            for (Event e : eventList){
                e.removeParticipantBoolean(participantToDelete);
            }
        }else{
            System.out.println("Error: no participant with number " + participantToDelete + " exists");
        }


    }

    private void addResult(){

        int participantNumber = inputInts("Number: ");
        if(!participantExists(participantNumber)){
            System.out.println("Error: no participant with number " + participantNumber + " found!");
            return;
        }
        Participant p = addResultParticipant(participantNumber);
        String eventName = inputStrings("Event: ");
        if(!eventExists(eventName)){
            System.out.println("Error: no event called \"" + eventName + "\" found!");
            return;
        }
        Event e = findEvent(eventName);

        if(p.countTries(eventName) < e.getAttemptsAllowed()){
            double result = getResult(inputDoubles("Results for " + getName(participantNumber) + " from " + p.getTeam() + " in " + eventName + ": "), participantNumber, p, eventName);

            p.addResultForParticipant(new Result(result, findEvent(eventName), p));
            e.setResultListEvent(new Result(result, findEvent(eventName), p));


        }else{
            System.out.println("Error: " + getName(participantNumber) + " from " + p.getTeam() + " has already made " + e.getAttemptsAllowed() + " attempts in " + eventName);
        }

    }

    private double getResult(double result, int startNumber, Participant o, String eventName){

        while (result < 0) {
            System.out.println("Error: must be greater than or equal to zero!");
            result = inputDoubles("Results for " + getName(startNumber) + " from " + o.getTeam() + " in " + eventName + ": ");
        }

        return result;
    }

    private void viewParticipant(){

        int inputViewParticipant = inputInts("Number: ");
        if(!participantExists(inputViewParticipant)) {
            System.out.println("Error: no participant with number " + inputViewParticipant + " found!");
            return;
        }
        Participant p = findParticipant(inputViewParticipant);

        for (Event e : eventList) {
            if(p.didParticipate(e.getEventName())) {
                System.out.print("Results for " + getName(inputViewParticipant) + " in " + e.getEventName() + ": ");

                p.getResultPerEvent(e.getEventName());
            }

            System.out.println(" ");
        }
    }

    private Participant findParticipant(int participantNumber){
        for (Participant p : participantList){
            if(p.getNumber() == participantNumber){
                return p;
            }
        }
        return null;
    }

    private void viewEvent(String eventName) {

        for (Event e : eventList){
            if (eventName.equals(e.getEventName())){
                e.viewEventList();

            }
        }

    }

    private boolean checkParticipantForRemoval(int participantNumber){
        for (Participant p : participantList){
            if(p.getNumber() == participantNumber){
                System.out.println(p.getFullName() + " from " + p.getTeam() + " with number " + participantNumber + " removed");
                participantList.remove(p);
                return true;
            }
        }
        return false;
    }

    private boolean participantExists (int participantNumber){

        for (Participant o : participantList){
            if(o.getNumber() == participantNumber){
                return true;
            }
        }
        return false;
    }

    private boolean eventExists(String eventName){
        boolean exists = false;

        for (Event e : eventList){
            if(eventName.equals(e.getEventName())) {
                exists = true;
                break;
            }else{
                exists = false;
            }
        }
        return exists;
    }

    private Participant addResultParticipant(int participantNumber) {
        Participant o = null;
        for (Participant p : participantList) {
            if (participantNumber != p.getNumber()) {
                o = null;
            } else {
                o = p;
                return o;
            }
        }
        return o;
    }

    private Event findEvent(String eventName){
        Event w = null;
        for (Event e : eventList){
            if(!eventName.equals(e.getEventName())){
                w = null;
            }else{
                w = e;
                return w;
            }
        }
        return w;
    }

    private boolean eventExistsStartMenu(String command){
        for (Event e : eventList){
            if(command.equals(e.getEventName())){
                return true;
            }
        }
        return false;
    }

    private void message(String command) {

        String cutMessage = command.substring(8, Math.min(command.length(), 62));

        if (cutMessage.length() % 2 == 0) {
            int paddingNeededPerSide = (58 - cutMessage.length()) / 2;
            String paddingLeftSide = String.format("%" + paddingNeededPerSide + "s", "");
            String paddingRightSide = String.format("%-" + paddingNeededPerSide + "s", "");

            System.out.println("############################################################");
            System.out.println("#                                                          #");
            System.out.println("#" + paddingLeftSide + cutMessage.toUpperCase() + paddingRightSide + "#");
            System.out.println("#                                                          #");
            System.out.println("############################################################");
        } else {
            int paddingNeededPerSide = (58 - cutMessage.length()) / 2;
            String paddingLeftSide = String.format("%" + paddingNeededPerSide + "s", "");
            String paddingRightSide = String.format("%-" + paddingNeededPerSide + "s", "");

            System.out.println("############################################################");
            System.out.println("#                                                          #");
            System.out.println("#" + paddingLeftSide + cutMessage.toUpperCase() + paddingRightSide + " #");
            System.out.println("#                                                          #");
            System.out.println("############################################################");
        }


    }

    private String getName(int number) {

        String fullName = null;

        for (Participant p : participantList) {
            if (p.getNumber() == number) {
                fullName = p.getFirstName() + " " + p.getLastName();
                return fullName;
            }
        }

        return fullName;
    }

    private String inputStrings(String prompt) {
        System.out.print(prompt);
        String s = keyboard.nextLine().toLowerCase().trim();

        if(s.isEmpty()){
            s = " ";
        }
        String sNormalized = s.substring(0, 1).toUpperCase() + s.substring(1).toLowerCase();
        return sNormalized;
    }

    private int inputInts(String prompt) {
        System.out.print(prompt);
        int i = keyboard.nextInt();
        keyboard.nextLine();
        return i;
    }

    private double inputDoubles(String prompt) {
        System.out.print(prompt);
        double d = keyboard.nextDouble();
        keyboard.nextLine();
        return d;
    }

    private void run() {
        boolean running;

        do {

            String command = readCommand();
            running = useCommand(command);

        } while (running);
    }

    public static void main(String[] args) {
        new Register().run();

    }

}

NY KLASS EVENT

// Felix Vejdegren || Jack Hällström || Douglas Hammarstam
// feve5814@student.su.se || jaha4972@student.su.se || doha6991@student.su.se


import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class Event {

    private String eventName;
    private int attemptsAllowed;
    private List<Result> resultListEvent = new ArrayList<>();

    public Event(String eventName, int attemptsAllowed) {
        this.eventName = eventName;
        this.attemptsAllowed = attemptsAllowed;
    }

    public String getEventName() {
        return eventName;
    }

    public int getAttemptsAllowed() {
        return attemptsAllowed;
    }

    public void setResultListEvent(Result r){

        Result tempResult = null;

        if (resultListEvent.isEmpty()){
            resultListEvent.add(r);
            return;
        }

        if(!hasParticipated(r)){
            resultListEvent.add(r);

            return;
        }

        for (Result t : resultListEvent){
            if(t.getResult() < r.getResult() && t.getParticipant().getNumber() == r.getParticipant().getNumber()){

                tempResult = t;
            }
        }

        if(tempResult != null){
            resultListEvent.remove(tempResult);
            resultListEvent.add(r);
        }

    }

    private boolean hasParticipated (Result r){

        for (Result t : resultListEvent) {
            if (t.getParticipant().getNumber() == r.getParticipant().getNumber()) {
                return true;
            }
        }
        return false;
    }

    private List<Result> bubbleSortList(List<Result> listToSort){
        int n = resultListEvent.size();
        Result temp;

        for (Result r : listToSort){
            for(int i = 0 ; i < n; i++){
                for ( int j = 1; j < (n - i); j++){
                    if(listToSort.get(j-1).getResult() < listToSort.get(j).getResult()){
                        temp = listToSort.get(j - 1);
                        listToSort.set(j -1, listToSort.get(j));
                        listToSort.set(j, temp);
                    }
                }
            }
        }
        return listToSort;

    }

    public void viewEventList() {
        bubbleSortList(sortAlphabetically(resultListEvent));
        int [] placements = new int [resultListEvent.size()];
        placements = createPlacementList();


        System.out.println("Results for " + eventName);
        for (int i = 0; i < resultListEvent.size(); i++){
            System.out.print(placements[i] + ": ");
            System.out.println(resultListEvent.get(i).getResult() + " " + resultListEvent.get(i).getParticipant().getFullName() + " " + resultListEvent.get(i).getParticipant().getTeam());
        }
    }

    private int [] createPlacementList(){

        int [] placements = new int [resultListEvent.size()];
        if(placements.length != 0)
            placements[0] = 1;

        for (int i = 1 ; i < placements.length; i++){
            for (Result r : resultListEvent){
                placements[i] = resultListEvent.get(i).getResult() == resultListEvent.get(i-1).getResult() ? placements[i-1] : i+1;
            }
        }
        return placements;
    }

    private List<Result> sortAlphabetically(List<Result> listToSort){

        listToSort.sort(new Comparator<Result>() {
            public int compare(Result r1, Result r2) {
                return r1.getParticipant().getFullName().compareTo(r2.getParticipant().getFullName());
            }
        });
        return listToSort;

    }

    public boolean removeParticipantBoolean (int startNumber){
        for (Result r : resultListEvent){
            if(startNumber == r.getParticipant().getNumber()){
                resultListEvent.remove(r);
                return true;
            }
        }
        return false;
    }

    public String toString() {
        return (eventName + " " + attemptsAllowed);
    }

}

ny klass participant

// Felix Vejdegren || Jack Hällström || Douglas Hammarstam
// feve5814@student.su.se || jaha4972@student.su.se || doha6991@student.su.se
import java.util.ArrayList;
import java.util.List;

public class Participant {

    private String firstName;
    private String lastName;

    private String team;
    private int number;
    private List<Result> resultList = new ArrayList<>();


    public Participant(String firstName, String lastName, String team, int number) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.team = team;
        this.number = number;
    }

    public String getFirstName() {
        return firstName;
    }


    public String getLastName() {
        return lastName;
    }


    public String getFullName() {
        return firstName + " " + lastName;
    }

    public String getTeam() {
        return team;
    }


    public int getNumber() {
        return number;
    }


    public void addResultForParticipant(Result r){

            resultList.add(r);
            bubbleSortList(resultList);

    }

    public int countTries(String eventName){
        int tries = 0;
        for(Result r : resultList){
            if(r.getEventName().equals(eventName))
                tries++;
        }
        return tries;
    }

    public void getResultPerEvent (String eventName){

        List<Result> participantResults = new ArrayList<>();

        for(Result r : resultList){
            if(r.getEventName().equals(eventName)){
                participantResults.add(r);
            }
        }
        System.out.print(participantResults);
    }

    public boolean didParticipate (String eventName){
        for (Result r : resultList){
            if(getNumber()==this.number &&  r.getEventName().equals(eventName)){
                return true;
            }
        }
        return false;
    }

    private List<Result> bubbleSortList(List<Result> listToSort){
        int n = resultList.size();
        Result temp;

        for (Result r : listToSort){
            for(int i = 0 ; i < n; i++){
                for ( int j = 1; j < (n - i); j++){
                    if(listToSort.get(j-1).getResult() < listToSort.get(j).getResult()){
                        temp = listToSort.get(j - 1);
                        listToSort.set(j -1, listToSort.get(j));
                        listToSort.set(j, temp);
                    }
                }
            }
        }
        return listToSort;

    }

    public String toString() {
        return (firstName + " " + lastName + " from " + team + " with number " + number);
    }
}