03_Tanks_Collector_ProgramFundMidExam_2Nov2019_Group2

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

public class TanksCollector {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        List<String> alreadyOwned = Arrays.stream(scanner.nextLine().split(", "))
                .collect(Collectors.toList());

        int commandCount = Integer.parseInt(scanner.nextLine());

        for (int i = 1; i <= commandCount; i++) {
            String command = scanner.nextLine();
            String[] tokens = command.split(", ");
            String tankName = "";
            int index = 0;

            switch (tokens[0]) {

                case "Add":
                    tankName = tokens[1];

                    if (alreadyOwned.contains(tankName)) {
                        System.out.println("Tank is already bought");
                    } else {
                        System.out.println("Tank successfully bought");
                        alreadyOwned.add(tankName);
                    }
                    break;

                case "Remove":
                    tankName = tokens[1];

                    if (alreadyOwned.contains(tankName)) {
                        System.out.println("Tank successfully sold");
                        alreadyOwned.remove(tankName);
                    } else {
                        System.out.println("Tank not found");
                    }
                    break;

                case "Remove At":
                    index = Integer.parseInt(tokens[1]);

                    if (checkIfIndexExists(alreadyOwned, index)) {
                        alreadyOwned.remove(index);
                        System.out.println("Tank successfully sold");
                    } else {
                        System.out.println("Index out of range");
                    }
                    break;

                case "Insert":
                    index = Integer.parseInt(tokens[1]);
                    tankName = tokens[2];

                    if (checkIfIndexExists(alreadyOwned, index)) {
                        if (alreadyOwned.contains(tankName)) {
                            System.out.println("Tank is already bought");
                        } else {
                            alreadyOwned.add(index, tankName);
                            System.out.println("Tank successfully bought");
                        }
                    } else {
                        System.out.println("Index out of range");
                    }
                    break;
            }
        }
        System.out.print(String.join(", ", alreadyOwned));
    }

    private static boolean checkIfIndexExists(List<String> alreadyOwned, int index) {
        return index >= 0 && index < alreadyOwned.size();
    }
}