package com.dogcows;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;

import com.topcoder.client.contestApplet.common.Common;
import com.topcoder.client.contestApplet.common.LocalPreferences;
import com.topcoder.client.contestant.ProblemComponentModel;
import com.topcoder.shared.language.Language;
import com.topcoder.shared.problem.Renderer;

/**
 * @author Charles McGarvey
 * The TopCoder Arena editor plug-in providing support for Vim.
 * 
 * Distributable under the terms and conditions of the 2-clause BSD license;
 * see the file COPYING for a complete text of the license.
 */
public class VimCoder
{
    /**
     * The name and version of this plugin.
     */
    public final static String version = "VimCoder 0.3.6";


    /**
     * The first part of the command used to invoke the Vim server.
     */
    private static String vimCommand = "gvim";

    /**
     * The path to the main VimCoder directory.
     */
    private static File rootDir;
    static
    {
        if (System.getProperty("os.name").toLowerCase().equals("win"))
        {
            vimCommand = "C:\\WINDOWS\\gvim.bat";
        }
        rootDir = new File(System.getProperty("user.home") + System.getProperty("file.separator") + ".vimcoder");
    }

    /**
     * Whether or not to use the contest name and point value as problem
     * directory names.
     */
    private static boolean contestDirNames = false;


    /**
     * The panel given to the Arena applet when it is requested.
     */
    private JPanel panel;

    /**
     * The text widget where log messages are appended.
     */
    private JTextArea logArea;

    /**
     * The current editor object (or null if there is none).
     */
    private Editor editor;

    /**
     * The configuration panel.
     */
    private JDialog configDialog;


    /**
     * The key for the vim command preference.
     */
    private final static String VIMCOMMAND = "com.dogcows.VimCoder.config.vimcommand";

    /**
     * The key for the root directory preference.
     */
    private final static String ROOTDIR = "com.dogcows.VimCoder.config.rootdir";

    /**
     * The key for the problem directory name preference.
     */
    private final static String CONTESTDIRNAMES = "com.dogcows.VimCoder.config.contestdirnames";

    /**
     * The preferences object for storing plugin settings.
     */
    private static LocalPreferences prefs = LocalPreferences.getInstance();


    /**
     * Get the command for invoking vim.
     * @return The command.
     */
    public static String getVimCommand()
    {
        return vimCommand;
    }

    /**
     * Get the storage directory.
     * @return The directory.
     */
    public static File getStorageDirectory()
    {
        return rootDir;
    }

    /**
     * Get whether or not to save problems in a human-readable directory
     * structure.
     * @return The directory name setting.
     */
    public static boolean isContestDirNames()
    {
        return contestDirNames;
    }


    /**
     * Instantiate the entry point of the editor plugin.
     * Sets up the log widget and panel.
     */
    public VimCoder()
    {
        logArea = new JTextArea();
        logArea.setForeground(Color.GREEN);
        logArea.setBackground(Color.BLACK);
        logArea.setEditable(false);
        Font font = new Font("Courier", Font.PLAIN, 12);
        if (font != null) logArea.setFont(font);

        panel = new JPanel(new BorderLayout());
        panel.add(new JScrollPane(logArea), BorderLayout.CENTER);
    }


    /**
     * Called by the Arena when the plugin is about to be used.
     */
    public void startUsing()
    {
        Runnable task = new Runnable()
        {
            public void run()
            {
                logArea.setText("");
            }
        };
        if (SwingUtilities.isEventDispatchThread())
        {
            task.run();
        }
        else
        {
            SwingUtilities.invokeLater(task);
        }
        loadConfiguration();
    }

    /**
     * Called by the Arena when the plugin is no longer needed.
     */
    public void stopUsing()
    {
        editor = null;
    }

    /**
     * Called by the Arena to obtain the editor panel which we will use to
     * show log messages.
     * @return The editor panel.
     */
    public JPanel getEditorPanel()
    {
        return panel;
    }

    /**
     * Called by the Arena to obtain the current source.
     * This happens when the user is saving, compiling, and/or submitting.
     * @return The current source code.
     * @throws Exception If the source file edited by Vim couldn't be read.
     */
    public String getSource() throws Exception
    {
        try
        {
            String source = editor.getSource();
            logInfo("Source code uploaded to server.");
            return source;
        }
        catch (Exception exception)
        {
            logError("Failed to get source code: " + exception.getLocalizedMessage());
            throw exception;
        }
    }

    /**
     * Called by the Arena to pass the source it has.
     * @param source The source code.
     */
    public void setSource(String source)
    {
        try
        {
            editor.setSource(source);
            logInfo("Source code downloaded from server.");
        }
        catch (Exception exception)
        {
            logError("Failed to save the source given by the server: " + exception.getLocalizedMessage());
            return;
        }
    }

    /**
     * Called by the Arena to pass along information about the current
     * problem.
     * @param component A container for the particulars of the problem.
     * @param language The currently selected language.
     * @param renderer A helper object to help format the problem
     * statement.
     */
    public void setProblemComponent(ProblemComponentModel component,
                    Language language, Renderer renderer)
    {
        try
        {
            editor = new Editor(component, language, renderer);
        }
        catch (Exception exception)
        {
            logError("An error occurred while loading the problem: " + exception.getLocalizedMessage());
        }
    }

    /**
     * Called by the Arena when it's time to show our configuration panel.
     */
    public void configure()
    {
        final int border = 10;
        final int inset = 2;

        loadConfiguration();

        configDialog = new JDialog();
        Container container = configDialog.getContentPane();
        container.setForeground(Common.FG_COLOR);
        container.setBackground(Common.WPB_COLOR);

        JPanel pane = new JPanel();
        container.add(pane);

        BoxLayout boxLayout = new BoxLayout(pane, BoxLayout.Y_AXIS);
        pane.setLayout(boxLayout);
        pane.setBorder(BorderFactory.createEmptyBorder(border, border, border, border));

        JPanel fieldPanel = new JPanel(new GridBagLayout());
        pane.add(fieldPanel);
        pane.add(Box.createRigidArea(new Dimension(0, border)));

        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.HORIZONTAL;
        c.insets = new Insets(inset, inset, inset, inset);

        JLabel rootDirLabel = new JLabel("Storage Directory:");
        rootDirLabel.setForeground(Common.FG_COLOR);
        c.gridx = 0;
        c.gridy = 0;
        c.gridwidth = 1;
        fieldPanel.add(rootDirLabel, c);

        final JTextField rootDirField = new JTextField(rootDir.getPath());
        rootDirField.setPreferredSize(new Dimension(0, 24));
        c.gridx = 1;
        c.gridy = 0;
        c.weightx = 1.0;
        fieldPanel.add(rootDirField, c);

        JButton browseButton = new JButton("Browse");
        c.gridx = 2;
        c.gridy = 0;
        c.weightx = 0.0;
        c.anchor = GridBagConstraints.BASELINE_LEADING;
        fieldPanel.add(browseButton, c);

        final JCheckBox contestDirNamesButton = new JCheckBox(
            "Store problems according to contest name and point value.",
            contestDirNames
        );
        contestDirNamesButton.setForeground(Common.FG_COLOR);
        contestDirNamesButton.setBackground(Common.WPB_COLOR);
        contestDirNamesButton.setFont(rootDirLabel.getFont());
        c.gridx = 1;
        c.gridy = 1;
        c.gridwidth = 2;
        fieldPanel.add(contestDirNamesButton, c);

        JLabel vimCommandLabel = new JLabel("Vim Command:");
        vimCommandLabel.setForeground(Common.FG_COLOR);
        c.gridx = 0;
        c.gridy = 2;
        c.gridwidth = 1;
        fieldPanel.add(vimCommandLabel, c);

        final JTextField vimCommandField = new JTextField(vimCommand);
        vimCommandField.setPreferredSize(new Dimension(0, 24));
        c.gridx = 1;
        c.gridy = 2;
        c.weightx = 1.0;
        c.gridwidth = 2;
        fieldPanel.add(vimCommandField, c);

        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING, inset, inset));
        buttonPanel.setPreferredSize(new Dimension(400, 24 + 2 * inset));
        pane.add(buttonPanel);

        JButton saveButton = new JButton("Save");
        buttonPanel.add(saveButton);
        buttonPanel.add(Box.createRigidArea(new Dimension(1, 0)));

        JButton closeButton = new JButton("Close");
        buttonPanel.add(closeButton);

        browseButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                JFileChooser chooser = new JFileChooser();
                chooser.setCurrentDirectory(new File("."));
                chooser.setDialogTitle("Choose Storage Directory");
                chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                chooser.setAcceptAllFileFilterUsed(false);

                if (chooser.showOpenDialog(configDialog) == JFileChooser.APPROVE_OPTION)
                {
                    rootDirField.setText(chooser.getSelectedFile().getPath());
                }
            }
        });

        closeButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                configDialog.dispose();
            }
        });

        saveButton.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent actionEvent)
            {
                prefs.setProperty(VIMCOMMAND, vimCommandField.getText());
                prefs.setProperty(ROOTDIR, rootDirField.getText());
                prefs.setProperty(CONTESTDIRNAMES, String.valueOf(contestDirNamesButton.isSelected()));
                JOptionPane.showMessageDialog(null, "Preferences were saved successfully.");
            }
        });

        configDialog.setTitle("VimCoder Preferences");
        configDialog.pack();
        configDialog.setLocationRelativeTo(null);   // Center dialog in screen.
        configDialog.setModalityType(Dialog.DEFAULT_MODALITY_TYPE);
        configDialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        configDialog.setVisible(true);
    }


    /**
     * Load the local preferences related to this plugin.
     */
    private void loadConfiguration()
    {
        String vc  = prefs.getProperty(VIMCOMMAND);
        if (vc != null) vimCommand = vc;

        String dir = prefs.getProperty(ROOTDIR);
        if (dir != null) rootDir = new File(dir);

        String cn  = prefs.getProperty(CONTESTDIRNAMES);
        if (cn != null) contestDirNames = Boolean.parseBoolean(cn);
    }


    /**
     * A generic logging function, appends text to the text area.  A timestamp
     * is also prepended to the next text.
     * @param what The text to append.
     */
    private void log(final String what)
    {
        Runnable task = new Runnable()
        {
            public void run()
            {
                SimpleDateFormat format = new SimpleDateFormat("kk:mm:ss");
                logArea.append(format.format(new Date()) + ", " + what);
            }
        };
        if (SwingUtilities.isEventDispatchThread())
        {
            task.run();
        }
        else
        {
            SwingUtilities.invokeLater(task);
        }
    }

    /**
     * Output non-critical messages to the log.
     * @param what The text of the message.
     */
    private void logInfo(String what)
    {
        log(" INFO: " + what + System.getProperty("line.separator"));
    }

    /**
     * Output critical messages and errors to the log.
     * @param what The text of the message.
     */
    private void logError(String what)
    {
        log("ERROR: " + what + System.getProperty("line.separator"));
    }
}

// vim:et:ts=8:sts=4:sw=4