import java.io.*;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class TaskQueueImporter {

/**

* Imports task queue data from a file. Supports multiple formats (e.g., simple text, CSV).

*

* @param filePath The path to the task queue data file.

* @return A map where keys are queue names and values are lists of tasks. Returns an empty map on error.

*/

public static Map<String, List<String>> importTaskQueueData(String filePath) {

Map<String, List<String>> taskQueues = new HashMap<>();

try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {

String line;

while ((line = reader.readLine()) != null) {

line = line.trim(); // Remove leading/trailing whitespace

if (line.isEmpty()) {

continue; // Skip empty lines

}

// Attempt to parse the line based on common formats. Adjust regex as needed.

// Format 1: "QueueName: task1,task2,task3"

Pattern pattern1 = Pattern.compile("^(.*?): (.*)$");

Matcher matcher1 = pattern1.matcher(line);

if (matcher1.matches()) {

String queueName = matcher1.group(1).trim();

String tasksString = matcher1.group(2).trim();

List<String> tasks = tasksString.split(",").stream().map(String::trim).toList();

taskQueues.put(queueName, tasks);

continue;

}

// Format 2: "QueueName - task1;task2;task3"

Pattern pattern2 = Pattern.compile("^(.*?)( - )(.*)$");

Matcher matcher2 = pattern2.matcher(line);

if (matcher2.matches()) {

String queueName = matcher2.group(1).trim();

String tasksString = matcher2.group(3).trim();

List<String> tasks = tasksString.split(";").stream().map(String::trim).toList();

taskQueues.put(queueName, tasks);

continue;

}

//Format 3: "QueueName task1 task2 task3" (space separated)

Pattern pattern3 = Pattern.compile("^(.*?)\\s+(.*)$");

Matcher matcher3 = pattern3.matcher(line);

if(matcher3.matches()){

String queueName = matcher3.group(1).trim();

String tasksString = matcher3.group(2).trim();

List<String> tasks = tasksString.split("\\s+").stream().map(String::trim).toList();

taskQueues.put(queueName, tasks);

continue;

}

// If no known format is matched, log a warning. Consider adding more parsing logic

System.err.println("Warning: Unrecognized line format: " + line);

}

} catch (IOException e) {

System.err.println("Error reading file: " + e.getMessage());

return new HashMap<>(); // Return empty map on error.

}

return taskQueues;

}

public static void main(String[] args) {

// Example usage

String filePath = "task_queue_data.txt";

Map<String, List<String>> taskQueues = importTaskQueueData(filePath);

for (Map.Entry<String, List<String>> entry : taskQueues.entrySet()) {

System.out.println("Queue: " + entry.getKey());

System.out.println("Tasks: " + entry.getValue());

}

}

}