MainApp.java - Swing GUI

package edu.bu.LanguageCorrection;

import javax.swing.*;

import java.awt.*;

// import java.awt.event.ActionEvent;

import java.io.ByteArrayOutputStream;

import java.io.PrintStream;

import java.nio.file.Files;

import java.nio.file.Paths;

import java.util.List;

public class MainApp extends JFrame {

    private final JTextField urlField;

    private final JTextArea resultArea;

    private final JButton runButton;

    private final JComboBox<String> moduleSelector;

    public MainApp() {

        super("Language Correction Tool");

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setSize(800, 600);

        setLocationRelativeTo(null);

        setLayout(new BorderLayout());

        // Module selector

        String[] modules = {"Select Module", "Crawler", "Checker", "Corrector"};

        moduleSelector = new JComboBox<>(modules);

        // User inout entry field and run button

        urlField = new JTextField();

        runButton = new JButton("Run");

        runButton.addActionListener(e -> {

            String selectedModule = (String) moduleSelector.getSelectedItem();

            String input = urlField.getText().trim();

            switch (selectedModule) {

                case "Crawler":

                    runCrawler(input);

                    break;

                case "Checker":

                    runChecker(input);

                    break;

                case "Corrector":

                    runCorrector(input);

                    break;

                default:

                    JOptionPane.showMessageDialog(this, "Select a valid module");

            }

        });

        JPanel northPanel = new JPanel(new BorderLayout());

        northPanel.add(moduleSelector, BorderLayout.WEST);

        northPanel.add(urlField, BorderLayout.CENTER);

        northPanel.add(runButton, BorderLayout.EAST);

        // Result area

        resultArea = new JTextArea();

        resultArea.setEditable(false);

        JScrollPane scrollPane = new JScrollPane(resultArea);

        add(northPanel, BorderLayout.NORTH);

        add(scrollPane, BorderLayout.CENTER);

    }

    private void runCrawler(String input) {

        crawler webCrawler = new crawler();

        if (input.startsWith("http")) {

            // Input is a single URL

            webCrawler.add_to_queue(input);

        } else {

            // Input is file path

            try {

                List<String> lines = Files.readAllLines(Paths.get(input));

                lines.forEach(webCrawler::add_to_queue);

            } catch (Exception e) {

                resultArea.setText("Error reading file: " + e.getMessage());

                return;

            }

        }

        // Redirect output to the GUI

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        PrintStream printStream = new PrintStream(outputStream);

        PrintStream oldStream = System.out;

        System.setOut(printStream);

        // Run the crawler

        webCrawler.crawl(1); // Adjust the limit (DEFAULT SET TO 1)

        // Restore standard output and update the GUI

        System.setOut(oldStream);

        resultArea.setText(outputStream.toString());

    }

    private void runChecker(String filePath) {

        try {

            String content = new String(Files.readAllBytes(Paths.get(filePath)));

            Checker checker = new Checker();

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            PrintStream ps = new PrintStream(baos);

            PrintStream old = System.out;

            System.setOut(ps);

            checker.analyze(content);

            System.out.flush();

            System.setOut(old);

            resultArea.setText(baos.toString());

        } catch (Exception e) {

            resultArea.setText("Error: " + e.getMessage());

        }

    }

    private void runCorrector(String filePath) {

        try {

            String content = new String(Files.readAllBytes(Paths.get(filePath)));

            Corrector corrector = new Corrector();

            String corrected = corrector.correct(content);

            resultArea.setText("Corrected Text:\n" + corrected);

        } catch (Exception e) {

            resultArea.setText("Error: " + e.getMessage());

        }

    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(() -> {

            MainApp mainApp = new MainApp();

            mainApp.setVisible(true);

        });

    }

}