O2. Treasure Hunt / O6. Mid Exam Retake

package MidExam.O6;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class O2TreasureHunt {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<String> test = Arrays.stream(scanner.nextLine().split("\\|")).
                map(String::toString).collect(Collectors.toList());

        String input = scanner.nextLine();

        while (!input.equals("Yohoho!")) {

            List<String> a = Arrays.stream((input.split(" "))).
                    map(String::toString).collect(Collectors.toList());
            String command = a.get(0);
            switch (command) {
                case "Loot":
                    for (int i = 1; i < a.size(); i++) {
                        if (!test.contains(a.get(i))) {
                            test.add(0, a.get(i));
                        }
                    }
                    break;
                case "Drop":
                    int index = Integer.parseInt(a.get(1));
                    if (index < 0 || index >= test.size()) {
                        break;
                    }
                    String item = test.get(index);
                    test.remove(index);
                    test.add(item);
                    break;
                case "Steal":
                    index = Integer.parseInt(a.get(1));
                    List<String> stolenItems = new ArrayList<>();
                    String output = "";
                   if (index>= test.size()){
                       output =String.join(", ", test);
                       System.out.println(output);
                       test.clear();
                       break;
                   }else{
                       for (int i = 0; i < index; i++) {
                           int lastIndex = test.size() - 1;
                           stolenItems.add(0, test.remove(lastIndex));
                       }

                       output = String.join(", ", stolenItems);
                       System.out.println(output);
                   }
                    break;
            }
            input = scanner.nextLine();
        }

        if (test.size() > 0) {
            double sum = 0;
            for (String s : test) {
                sum += s.length();
            }
            System.out.printf("Average treasure gain: %.2f pirate credits.", sum / test.size());
        } else {
            System.out.println("Failed treasure hunt.");
        }

    }
}