Problem 3 - Chat Logger

package PodgotovkaZaIzpit;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

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

        List<String> chatHistory = new ArrayList<>();

        String command = scanner.nextLine();
        while (!command.equals("end")) {
            String[] tokens = command.split("\\s+");
            String action = tokens[0];

            switch (action) {
                case "Chat":
                    chatHistory.add(tokens[1]);
                    break;
                case "Delete":
                    String messageToDelete = tokens[1];
                    if (chatHistory.contains(messageToDelete)) {
                        chatHistory.remove(messageToDelete);
                    }
                    break;
                case "Edit":
                    String messageToEdit = tokens[1];
                    String editedMessage = tokens[2];
                    if (chatHistory.contains(messageToEdit)) {
                        int index = chatHistory.indexOf(messageToEdit);
                        chatHistory.set(index, editedMessage);
                    }
                    break;
                case "Pin":
                    String messageToPin = tokens[1];
                    chatHistory.remove(messageToPin);
                    chatHistory.add(messageToPin);
                    break;
                case "Spam":
                    for (int i = 1; i < tokens.length; i++) {
                        chatHistory.add(tokens[i]);
                    }
                    break;
            }

            command = scanner.nextLine();
        }

        for (String message : chatHistory) {
            if (!message.equals("Hi")) {
                System.out.println(message);
            }
        }
    }
}