package com.melloware.jukes.gui.view.dialogs;
   
   import java.awt.BorderLayout;
   import java.awt.EventQueue;
   import java.awt.Frame;
   import java.awt.event.ActionEvent;
   import java.io.File;
   import java.io.IOException;
   import java.lang.reflect.InvocationTargetException;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  import javax.swing.AbstractAction;
  import javax.swing.Action;
  import javax.swing.DefaultListModel;
  import javax.swing.JButton;
  import javax.swing.JCheckBox;
  import javax.swing.JComponent;
  import javax.swing.JFileChooser;
  import javax.swing.JList;
  import javax.swing.JPanel;
  import javax.swing.JProgressBar;
  import javax.swing.JScrollPane;
  import javax.swing.JTextField;
  import javax.swing.ListSelectionModel;
  import javax.swing.text.JTextComponent;
  
  import org.apache.commons.collections.list.SetUniqueList;
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.lang.StringUtils;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import com.jgoodies.forms.builder.PanelBuilder;
  import com.jgoodies.forms.factories.Borders;
  import com.jgoodies.forms.factories.ButtonBarFactory;
  import com.jgoodies.forms.layout.CellConstraints;
  import com.jgoodies.forms.layout.FormLayout;
  import com.jgoodies.uif.AbstractDialog;
  import com.jgoodies.uif.util.Worker;
  import com.jgoodies.uifextras.panel.HeaderPanel;
  import com.jgoodies.validation.Severity;
  import com.jgoodies.validation.ValidationMessage;
  import com.melloware.jukes.db.HibernateDao;
  import com.melloware.jukes.exception.InfrastructureException;
  import com.melloware.jukes.file.filter.FilterFactory;
  import com.melloware.jukes.gui.tool.Resources;
  import com.melloware.jukes.gui.tool.Settings;
  import com.melloware.jukes.gui.view.component.ComponentFactory;
  import com.melloware.jukes.gui.view.component.MessageCellRenderer;
  import com.melloware.jukes.util.GuiUtil;
  import com.melloware.jukes.util.JukesValidationMessage;
  import com.melloware.jukes.util.MessageUtil;
  
  /**
   * Compares a text file list of a catalog against the current catalog loaded
   * in the database.  Useful for comparing what one catalog has that the other
   * one doesn't or what they have in common.
   * <p>
   * Copyright (c) 1999-2007 Melloware, Inc. <http://www.melloware.com>
   * @author Emil A. Lefkof III <info@melloware.com>
   * @version 4.0
   */
  @SuppressWarnings("unchecked")
  public final class DifferenceToolDialog
      extends AbstractDialog {
  
      private static final Log LOG = LogFactory.getLog(DifferenceToolDialog.class);
      private static final String BREAK = " - ";
      private final Map mapDiscs = new HashMap();
      private DefaultListModel listModel;
      private JButton buttonCancel;
      private JButton buttonClose;
      private JButton buttonDiff;
      private JButton buttonIntersection;
      private JButton buttonSave;
      private JButton buttonUnion;
      private JComponent buttonBar;
      private JList list;
      private JPanel panel;
      private JProgressBar progressBar;
      private JTextComponent file;
      private JCheckBox caseSensitive;
      private final Settings settings;
      private Worker worker;
  
      /**
       * Constructs a default about dialog using the given owner.
       *
       * @param owner   the dialog's owner
       */
      public DifferenceToolDialog(Frame owner, Settings settings) {
         super(owner);
         LOG.debug("Difference Tool created.");
         this.settings = settings;
         this.settings.getStartInDirectory();
     }
 
     /* (non-Javadoc)
      * @see com.jgoodies.swing.AbstractDialog#doCancel()
      */
     public void doCancel() {
         LOG.debug("Cancel Pressed.");
         if (worker != null) {
             worker.interrupt();
         }
     }
 
     /**
      * Builds and answers the dialog's content.
      *
      * @return the dialog's content with tabbed pane and button bar
      */
     protected JComponent buildContent() {
         JPanel content = new JPanel(new BorderLayout());
         content.add(buildMainPanel(), BorderLayout.CENTER);
         content.add(buttonBar, BorderLayout.SOUTH);
         return content;
     }
 
     /**
      * Builds and returns the dialog's header.
      *
      * @return the dialog's header component
      */
     protected JComponent buildHeader() {
         return new HeaderPanel("Difference Analyzer Tool ",
                                "Select an exported catalog text file and this tool will \n"
                                + "compare all differences, unions, or intersections with the current catalog.\n",
                                Resources.DIFFERENCE_TOOL_ICON);
     }
 
     /**
      * Builds and returns the dialog's pane.
      *
      * @return the dialog's  pane component
      */
     protected JComponent buildMainPanel() {
         // Create an action with an icon
         Action diff = new AbstractAction("Differences", Resources.DIFFERENCE_TOOL_DIFF_ICON) {
             // This method is called when the button is pressed
             public void actionPerformed(ActionEvent evt) {
                 doCompare(evt);
             }
         };
         Action intersection = new AbstractAction("Intersection", Resources.DIFFERENCE_TOOL_INTERSECTION_ICON) {
             // This method is called when the button is pressed
             public void actionPerformed(ActionEvent evt) {
                 doCompare(evt);
             }
         };
         Action union = new AbstractAction("Union", Resources.DIFFERENCE_TOOL_UNION_ICON) {
             // This method is called when the button is pressed
             public void actionPerformed(ActionEvent evt) {
                 doCompare(evt);
             }
         };
         Action export = new AbstractAction("Save", Resources.FILE_TEXT_ICON) {
             // This method is called when the button is pressed
             public void actionPerformed(ActionEvent evt) {
                 save(evt);
             }
         };
         buttonSave = new JButton(export);
         buttonDiff = new JButton(diff);
         buttonIntersection = new JButton(intersection);
         buttonUnion = new JButton(union);
         buttonCancel = createCancelButton();
         buttonClose = createCloseButton(true);
         buttonCancel.setEnabled(false);
         JButton[] buttons = new JButton[6];
         buttons[0] = buttonDiff;
         buttons[1] = buttonIntersection;
         buttons[2] = buttonUnion;
         buttons[3] = buttonSave;
         buttons[4] = buttonCancel;
         buttons[5] = buttonClose;
         buttonBar = ButtonBarFactory.buildCenteredBar(buttons);
         FormLayout layout = new FormLayout("fill:pref:grow", "p, p, p, p, p, p, p, p");
         PanelBuilder builder = new PanelBuilder(layout);
         builder.setDefaultDialogBorder();
         CellConstraints cc = new CellConstraints();
         int row = 1;
         builder.addSeparator("Find", cc.xy(1, row++));
         builder.add(buildFilePanel(), cc.xy(1, row++));
         builder.add(buildProgressPanel(), cc.xy(1, row++));
         builder.add(buildOptionsPanel(), cc.xy(1, row++));
         builder.add(buildListPanel(), cc.xy(1, 8));
         panel = builder.getPanel();
         panel.setBorder(Borders.DIALOG_BORDER);
         return panel;
     }
 
     /* (non-Javadoc)
      * @see com.jgoodies.swing.AbstractDialog#doCloseWindow()
      */
     protected void doCloseWindow() {
         super.doClose();
     }
 
     /**
     * Performs the comparison in a thread.
     *
     * @param aEvt the ActionEvent fired
     */
     protected void doCompare(ActionEvent aEvt) {
         LOG.debug(aEvt.getActionCommand());
 
         final String command = aEvt.getActionCommand();
         buttonCancel.setEnabled(true);
         buttonDiff.setEnabled(false);
         buttonUnion.setEnabled(false);
         buttonIntersection.setEnabled(false);
         buttonClose.setEnabled(false);
         buttonSave.setEnabled(false);
         GuiUtil.setBusyCursor(this, true);
 
         /* Invoking start() on the SwingWorker causes a new Thread
          * to be created that will call construct(), and then finished().  Note that finished() is called even if the
          * worker is interrupted because we catch the InterruptedException in doWork().
          */
         worker = new Worker() {
                 public Object construct() {
                     return doWork(command);
                 }
 
                 public void finished() {
                     threadFinished(get());
                 }
             };
         worker.start();
 
     }
 
     /**
     * Resizes the given component to give it a quadratic aspect ratio.
     *
     * @param component   the component to be resized
     */
     protected void resizeHook(JComponent component) {
         //Resizer.ONE2ONE.resizeDialogContent(component);
     }
 
     /**
      * Saves the list to a text file.
      * <p>
      * @param aEvt the ActionEvent fired.
      */
     protected void save(ActionEvent aEvt) {
         LOG.debug("Save pressed.");
         JFileChooser chooser = new JFileChooser();
         chooser.setDialogTitle("Save Report");
 
         chooser.setFileFilter(FilterFactory.textFileFilter());
         chooser.setMultiSelectionEnabled(false);
         chooser.setFileHidingEnabled(true);
         final int returnVal = chooser.showSaveDialog(this);
         if (returnVal != JFileChooser.APPROVE_OPTION) {
             return;
         }
         File file = chooser.getSelectedFile();
         if (LOG.isDebugEnabled()) {
             LOG.debug("Absolute: " + file.getAbsolutePath());
         }
 
         // add the extension if missing
         file = FilterFactory.forceTextExtension(file);
 
         try {
             // now query the catalog and save the results to the file
             ArrayList results = new ArrayList();
             Enumeration enumeration = listModel.elements();
             while (enumeration.hasMoreElements()) {
                 ValidationMessage message = (ValidationMessage)enumeration.nextElement();
                 results.add(message.formattedText());
             }
 
             FileUtils.writeLines(file, null, results);
 
             MessageUtil.showInformation(this, "Report saved successfully.");
         } catch (IOException ex) {
             LOG.error("Error writing file: \n\n" + ex.getMessage(), ex);
         } catch (InfrastructureException ex) {
             LOG.error("Error writing file: \n\n" + ex.getMessage(), ex);
         } catch (Exception ex) {
             LOG.error("Unexpected error writing file.", ex);
         }
     }
 
     /**
      * Finds if we have this disc in the database by artist and disc name.
      * <p>
      * @param aArtistName the artist name to find
      * @param aDiscName the disc name to find
      * @return true if we already have this, false if not
      */
     private boolean isHashMatch(String aArtistName, String aDiscName) {
         final String key = aArtistName + BREAK + aDiscName;
         return mapDiscs.containsKey(key.toUpperCase(Locale.US));
     }
 
     /**
      * Builds the file selection panel.
      * <p>
      * @return the panel used to select the file.
      */
     private JComponent buildFilePanel() {
         file = new JTextField();
         ((JTextField)file).setColumns(50);
         file.setText("");
         final FormLayout layout = new FormLayout("right:max(14dlu;pref), 4dlu, left:min(60dlu;pref):grow, pref, 40dlu, ,pref, pref",
                                            "p");
         final PanelBuilder builder = new PanelBuilder(layout);
         final CellConstraints cc = new CellConstraints();
 
         builder.addLabel("Select File:", cc.xy(1, 1));
         builder.add(file, cc.xyw(3, 1, 3));
         builder.add(ComponentFactory.createFileChooserButton(file, "Select Catalog", FilterFactory.textFileFilter()),
                     cc.xy(6, 1));
 
         return builder.getPanel();
     }
 
     /**
      * Builds the message list panel.
      * <p>
      * @return the panel used to display messages
      */
     private JComponent buildListPanel() {
         listModel = new DefaultListModel();
         // Create the list and put it in a scroll pane.
         list = new JList(listModel);
         list.setFocusable(false);
         list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
         list.setSelectedIndex(0);
         list.setCellRenderer(new MessageCellRenderer());
         list.setVisibleRowCount(18);
         return new JScrollPane(list);
     }
 
     /**
      * Builds the progressbar panel.
      * <p>
      * @return the panel used to select the directory.
      */
     private JComponent buildProgressPanel() {
         progressBar = new JProgressBar();
         progressBar.setIndeterminate(false);
         progressBar.setStringPainted(true);
         final FormLayout layout = new FormLayout("right:max(14dlu;pref), 4dlu, fill:pref:grow", "p"); 
         final PanelBuilder builder = new PanelBuilder(layout);
         final CellConstraints cc = new CellConstraints();
 
         builder.addLabel("Progress:", cc.xy(1, 1));
         builder.add(progressBar, cc.xy(3, 1));
 
         return builder.getPanel();
     }
 
     /**
      * Builds the options panel.
      * <p>
      * @return the panel containing any options
      */
     private JComponent buildOptionsPanel() {
         caseSensitive = new JCheckBox();
         caseSensitive.setSelected(true);
         final FormLayout layout = new FormLayout("right:max(14dlu;pref), 4dlu, fill:pref:grow", "p, 4px, p");    // extra bottom space for icons
 
         layout.setRowGroups(new int[][] {
                                 { 1, 3 }
                             });
         final PanelBuilder builder = new PanelBuilder(layout);
         final CellConstraints cc = new CellConstraints();
 
         builder.addLabel("Case Sensitive:", cc.xy(1, 1));
         builder.add(caseSensitive, cc.xy(3, 1));
 
         return builder.getPanel();
     }
     
     /**
      * Compares the text catalog to the database for differences
      * <p>
      * @param aDirectory the file to recurse
      * @throws InterruptedException if the thread is Interrupted stop processing
      */
     private void comparison(File aFile, String aCommand)
                      throws InterruptedException {
 
         // build a hasmap of discs for fast searching
         final Collection allDiscs = loadAllDiscs();
         for (Iterator iter = allDiscs.iterator(); iter.hasNext();) {
             final String key = (String)iter.next();
             mapDiscs.put(key.toUpperCase(Locale.US), key);
         }
 
         // load the file as Strings
         Collection lines;
         List unionList = new ArrayList();
         try {
             lines = FileUtils.readLines(aFile, null);
             
             if (!caseSensitive.isSelected()) {
                List ucList = new ArrayList();
                final Iterator itLines = lines.iterator();
                while (itLines.hasNext()) {
                   String element = (String) itLines.next();
                   ucList.add(element.toUpperCase());
                }
                lines = ucList;
             }
 
             int counter = 0;
             resetProgressBar(lines.size());
 
             for (Iterator iter = lines.iterator(); iter.hasNext();) {
                 counter++;
                 String line = (String)iter.next();
                 if (Thread.interrupted()) {
                     LOG.debug("Thread interrupted.");
                     throw new InterruptedException();
                 }
                 final String[] value = StringUtils.split(line, Resources.TAB);
                 final String artist = value[0];
                 final String disc = value[1];
                 final String discString = artist + BREAK + disc;
                 if ("Differences".equals(aCommand)) {
                     if (!isHashMatch(artist, disc)) {
                         final String output = "TAKE " + discString;
                         final String message = output;
                         final Severity severity = Severity.WARNING;
                         updateList(message, severity, counter);
                     }
                 } else if ("Intersection".equals(aCommand)) {
                     if (isHashMatch(artist, disc)) {
                         final String message = discString;
                         final Severity severity = Severity.OK;
                         updateList(message, severity, counter);
                     }
                 } else if ("Union".equals(aCommand)) {
                     unionList.add(discString);
                 } else {
                     throw new InterruptedException("Not a valid command button.");
                 }
             }
             
             progressBar.setValue(counter);
 
             // now get the differences the other way
             if ("Differences".equals(aCommand)) {
                 // loop through all discs in the catalog and look in file
                 final Collection discs = loadAllDiscs();
                 counter = 0;
                 resetProgressBar(discs.size());
                 for (Iterator iter = discs.iterator(); iter.hasNext();) {
                     counter++;
                     final String disc = (String)iter.next();
                     String line = StringUtils.replace(disc, BREAK, Resources.TAB, 1);
                     if (!lines.contains(line)) {
                         final String message = "GIVE " + disc;
                         final Severity severity = Severity.OK;
                         updateList(message, severity, counter);
                     }
                 }
                 progressBar.setValue(counter);
             }
 
             // now union the current catalog into it
             if ("Union".equals(aCommand)) {
                 final Collection discs = loadAllDiscs();
 
                 for (Iterator iter = discs.iterator(); iter.hasNext();) {
                     String disc = (String)iter.next();
                     unionList.add(disc);
                 }
                 Collections.sort(unionList);
                 final SetUniqueList uniqueList = SetUniqueList.decorate(unionList);
                 counter = 0;
                 resetProgressBar(uniqueList.size());
                 for (Iterator iter = uniqueList.iterator(); iter.hasNext();) {
                     counter++;
                     String element = (String)iter.next();
                     final Severity severity = Severity.OK;
                     updateList(element, severity, counter);
                 }
                 progressBar.setValue(counter);
             }
             
         } catch (IOException ex) {
             final String error = "Error reading file: " + ex.getMessage();
             LOG.error(error);
             throw new InterruptedException(error);
         } catch (InfrastructureException ex) {
             final String error = "Error querying database: " + ex.getMessage();
             LOG.error(error);
             throw new InterruptedException(error);
         } catch (Exception ex) {
             final String error = "Error reading file: " + ex.getMessage();
             LOG.error(error);
             throw new InterruptedException(error);
         }
     }
 
     /**
      * This method represents the application code that we'd like to
      * run on a separate thread.
      */
     private Object doWork(String aCommand) {
         Object result = null;
 
         try {
 
             // clear all old elements out
             listModel.removeAllElements();
 
             // get the file from the text box
             String filename = this.file.getText();
             File file = new File(filename);
             // make sure it is a file
             if (!file.exists()) {
                 LOG.error("Please select a valid file");
                 throw new InterruptedException();
             }
 
             // now do differences
             comparison(file, aCommand);
 
             if (Thread.interrupted()) {
                 LOG.debug("Thread interrupted.");
                 throw new InterruptedException();
             }
 
         } catch (InterruptedException e) {
             return result;    // SwingWorker.get() returns this
         }
         return result;    // or this
     }
 
     /**
      * Speadily loads all discs sorted by artist and disc.  Puts them into a
      * collection as "Artist - Disc".
      * <p>
      * @return the collection of discs strings
      */
     private Collection loadAllDiscs() {
         ArrayList results = new ArrayList();
         Collection discs = HibernateDao.findByQuery(Resources.getString("hql.export.catalog"));
 
         for (Iterator iter = discs.iterator(); iter.hasNext();) {
             Object[] queryResult = (Object[])iter.next();
 
             // Artist - Disc
             String disc = queryResult[0] + BREAK + queryResult[1];
             if (!caseSensitive.isSelected()) {
                disc = disc.toUpperCase();
             } 
             results.add(disc);
         }
         return results;
     }
 
     /**
      * Resets the progress bar and gives it a max progress.
      * <p>
      * @param aMaxProgress the maximum value of the progress bar.
      */
     private void resetProgressBar(int aMaxProgress) {
         progressBar.setMaximum(aMaxProgress);
         progressBar.setValue(0);
         progressBar.setIndeterminate(false);
     }
 
     /**
      * When the thread is finished this method is called.
      * <p>
      * @param result the Object return from the doWork thread.
      */
     private void threadFinished(Object result) {
     	if (LOG.isDebugEnabled()) {
         	LOG.debug("Thread Finished");
 			LOG.debug(result);
 		}
         GuiUtil.setBusyCursor(this, false);
         buttonCancel.setEnabled(false);
         buttonDiff.setEnabled(true);
         buttonUnion.setEnabled(true);
         buttonIntersection.setEnabled(true);
         buttonClose.setEnabled(true);
         buttonSave.setEnabled(true);
     }
 
     /**
      * When the worker needs to update the GUI we do so by queuing
      * a Runnable for the event dispatching thread with
      * SwingUtilities.invokeLater().  In this case we're just
      * changing the progress bars value.
      * @throws InvocationTargetException
      * @throws InterruptedException
      */
     private void updateList(final String aMessage, final Severity aSeverity, final int aProgress)
                      throws InterruptedException, InvocationTargetException {
         Runnable updateList = new Runnable() {
             public void run() {
                 progressBar.setValue(aProgress);
                 ValidationMessage message = new JukesValidationMessage(aMessage, aSeverity);
                 listModel.addElement(message);
                 int index = listModel.indexOf(message);
                 list.setSelectedIndex(index);
                 list.ensureIndexIsVisible(index);
             }
         };
         EventQueue.invokeAndWait(updateList);
     }
 
 }