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package IO;

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import exercises.Exercise2;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.SwingUtilities;
import javax.swing.filechooser.*;
 
/*
 * FileChooserDemo.java uses these files:
 *   images/Open16.gif
 *   images/Save16.gif
 */
public class FileManagerGUI extends JPanel
                             implements ActionListener {
    static private final String newline = "\n";
    JButton openButton;
    static JTextArea log;
    JFileChooser fc;
 
    public FileManagerGUI() {
        super(new BorderLayout());
 
        //Create the log first, because the action listeners
        //need to refer to it.
        log = new JTextArea(5,20);
        log.setMargin(new Insets(5,5,5,5));
        log.setEditable(false);
        JScrollPane logScrollPane = new JScrollPane(log);
 
        //Create a file chooser
        fc = new JFileChooser();
 
        //Uncomment one of the following lines to try a different
        //file selection mode.  The first allows just directories
        //to be selected (and, at least in the Java look and feel,
        //shown).  The second allows both files and directories
        //to be selected.  If you leave these lines commented out,
        //then the default mode (FILES_ONLY) will be used.
        //
        //fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        //fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
 
        //Create the open button.  We use the image from the JLF
        //Graphics Repository (but we extracted it from the jar).
        openButton = new JButton("Open a File...");
        openButton.addActionListener(this);
 
 
        //For layout purposes, put the buttons in a separate panel
        JPanel buttonPanel = new JPanel(); //use FlowLayout
        buttonPanel.add(openButton);
 
        //Add the buttons and the log to this panel.
        add(buttonPanel, BorderLayout.PAGE_START);
        add(logScrollPane, BorderLayout.CENTER);
    }
 
    public void actionPerformed(ActionEvent e) {
 
        //Handle open button action.
        if (e.getSource() == openButton) {
            int returnVal = fc.showOpenDialog(FileManagerGUI.this);
 
            if (returnVal == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                //This is where a real application would open the file.
                log.append("Opening: " + file.getName() + "." + newline);
                Input input=InputReader.readFile(file.getName());
                Exercise2.run(input);
            } else {
                log.append("Open command cancelled by user." + newline);
            }
            log.setCaretPosition(log.getDocument().getLength());
 
        //Handle save button action.
        } 
    }
 

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event dispatch thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("FileChooser");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
 
        //Add content to the window.
        frame.add(new FileManagerGUI());
 
        //Display the window.
        frame.pack();
        frame.setVisible(true);
        frame.setSize(500, 300);
    }
 
    public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
                UIManager.put("swing.boldMetal", Boolean.FALSE); 
                createAndShowGUI();
            }
        });
    }
}
