08. User Logs

package Uprajnenie;

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

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


        // TreeMap to store users' logs, sorted alphabetically by username
        TreeMap<String, LinkedHashMap<String, Integer>> users = fillUsersMap(scanner);

        // Print the users' logs
        printUsersMap(users);

        scanner.close();
    }

    // Method to fill the users' map with logs
    private static TreeMap<String, LinkedHashMap<String, Integer>> fillUsersMap(Scanner scanner) {
        TreeMap<String, LinkedHashMap<String, Integer>> users = new TreeMap<>();

        String input = scanner.nextLine();
        while (!input.equals("end")) {
            // Split input to extract IP address and username
            String internetProtocol = input.split(" ")[0].split("=")[1];
            String username = input.split(" ")[2].split("=")[1];

            // Update the users' map with the log entry
            users.putIfAbsent(username, new LinkedHashMap<>());
            users.get(username).put(internetProtocol, users.get(username).getOrDefault(internetProtocol, 0) + 1);

            input = scanner.nextLine();
        }

        return users;
    }

    // Method to print the users' logs
    private static void printUsersMap(TreeMap<String, LinkedHashMap<String, Integer>> users) {
        users.forEach((username, ipsMap) -> {
            System.out.println(username + ": ");
            int ipCount = ipsMap.size();
            int currentIpIndex = 0;
            for (Map.Entry<String, Integer> ipEntry : ipsMap.entrySet()) {
                System.out.print(ipEntry.getKey() + " => " + ipEntry.getValue());
                if (currentIpIndex < ipCount - 1) {
                    System.out.print(", ");
                } else {
                    System.out.print(".");
                }
                currentIpIndex++;
            }
            System.out.println();
        });
    }
}