/* CachePane.java -- Displays the specified folder and allows modification to its content.
Copyright (C) 2013 Red Hat

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package net.sourceforge.jnlp.controlpanel;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.SystemColor;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.channels.FileLock;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.Enumeration;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableModel;
import javax.swing.table.TableRowSorter;

import net.sourceforge.jnlp.cache.CacheDirectory;
import net.sourceforge.jnlp.cache.CacheLRUWrapper;
import net.sourceforge.jnlp.cache.DirectoryNode;
import net.sourceforge.jnlp.config.DeploymentConfiguration;
import net.sourceforge.jnlp.runtime.Translator;
import net.sourceforge.jnlp.util.FileUtils;
import net.sourceforge.jnlp.util.PropertiesFile;
import net.sourceforge.jnlp.util.logging.OutputController;
import net.sourceforge.jnlp.util.ui.NonEditableTableModel;

public class CachePane extends JPanel {
    JDialog parent;
    DeploymentConfiguration config;
    private String location;
    private JComponent defaultFocusComponent;
    DirectoryNode root;
    String[] columns = {
            Translator.R("CVCPColName"),
            Translator.R("CVCPColPath"),
            Translator.R("CVCPColType"),
            Translator.R("CVCPColDomain"),
            Translator.R("CVCPColSize"),
            Translator.R("CVCPColLastModified") };
    JTable cacheTable;
    private JButton deleteButton, refreshButton, doneButton;

    /**
     * Creates a new instance of the CachePane.
     * 
     * @param parent The parent dialog that uses this pane.
     * @param config The DeploymentConfiguration file.
     */
    public CachePane(JDialog parent, DeploymentConfiguration config) {
        super(new BorderLayout());
        this.parent = parent;
        this.config = config;
        location = config.getProperty(DeploymentConfiguration.KEY_USER_CACHE_DIR);

        addComponents();
    }

    /**
     * Add components to the pane.
     */
    private void addComponents() {
        JPanel topPanel = new JPanel(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.BOTH;

        TableModel model = new NonEditableTableModel(columns, 0);

        cacheTable = new JTable(model);
        cacheTable.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        cacheTable.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
            final public void valueChanged(ListSelectionEvent listSelectionEvent) {
                // If no row has been selected, disable the delete button, else enable it
                if (cacheTable.getSelectionModel().isSelectionEmpty())
                    // Disable delete button, since nothing selected
                    deleteButton.setEnabled(false);
                else
                    // Enable delete button, since something selected
                    deleteButton.setEnabled(true);
            }
        });
        cacheTable.setAutoResizeMode(JTable.AUTO_RESIZE_NEXT_COLUMN);
        cacheTable.setPreferredScrollableViewportSize(new Dimension(600, 200));
        cacheTable.setFillsViewportHeight(true);
        JScrollPane scrollPane = new JScrollPane(cacheTable);

        TableRowSorter<TableModel> tableSorter = new TableRowSorter<TableModel>(model);
        final Comparator comparator = new Comparator<Comparable>() { // General purpose Comparator
            public final int compare(final Comparable a, final Comparable b) {
                return a.compareTo(b);
            }
        };
        tableSorter.setComparator(1, comparator); // Comparator for path column.
        tableSorter.setComparator(4, comparator); // Comparator for size column.
        tableSorter.setComparator(5, comparator); // Comparator for modified column.
        cacheTable.setRowSorter(tableSorter);
        final DefaultTableCellRenderer tableCellRenderer = new DefaultTableCellRenderer() {
            @Override
            public final Component getTableCellRendererComponent(final JTable table, final Object value, final boolean isSelected, final boolean hasFocus, final int row, final int column) {
                super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);

                switch (column) {
                    case 1: // Path column
                    // Render absolute path
                    super.setText(((File)value).getAbsolutePath());
                    break;
                    case 4: // Size column
                    // Render size formatted to default locale's number format
                    super.setText(NumberFormat.getInstance().format(value));
                    break;
                    case 5: // last modified column
                    // Render modify date formatted to default locale's date format
                    super.setText(DateFormat.getDateInstance().format(value));
                }

                return this;
            }
        };
        // TableCellRenderer for path column
        cacheTable.getColumn(this.columns[1]).setCellRenderer(tableCellRenderer);
        // TableCellRenderer for size column
        cacheTable.getColumn(this.columns[4]).setCellRenderer(tableCellRenderer);
        // TableCellRenderer for last modified column
        cacheTable.getColumn(this.columns[5]).setCellRenderer(tableCellRenderer);

        c.weightx = 1;
        c.weighty = 1;
        c.gridx = 0;
        c.gridy = 0;
        topPanel.add(scrollPane, c);
        this.add(topPanel, BorderLayout.CENTER);
        this.add(createButtonPanel(), BorderLayout.SOUTH);
    }

    /**
     * Create the buttons panel.
     * 
     * @return JPanel containing the buttons.
     */
    private Component createButtonPanel() {
        JPanel buttonPanel = new JPanel(new GridLayout(1, 0));
        JPanel leftPanel = new JPanel(new FlowLayout(FlowLayout.LEADING));
        JPanel rightPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));

        List<JButton> buttons = new ArrayList<JButton>();

        this.deleteButton = new JButton(Translator.R("CVCPButDelete"));
        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // Deleting may take a while, so indicate busy by cursor
                parent.getContentPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
                // Disable dialog and buttons while deleting
                deleteButton.setEnabled(false);
                refreshButton.setEnabled(false);
                doneButton.setEnabled(false);
                // Delete on AWT thread after this action has been performed
                // in order to allow the cache viewer to update itself
                invokeLaterDelete();
            }
        });
        deleteButton.setEnabled(false);
        buttons.add(deleteButton);

        this.refreshButton = new JButton(Translator.R("CVCPButRefresh"));
        refreshButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // Disable all its controls when performing cacheTable refresh (populating)
                deleteButton.setEnabled(false);
                refreshButton.setEnabled(false);
                doneButton.setEnabled(false);
                // Populate cacheTable on AWT thread after this action event has been performed
                invokeLaterPopulateTable();
            }
        });
        refreshButton.setEnabled(false);
        buttons.add(refreshButton);

        this.doneButton = new JButton(Translator.R("ButDone"));
        doneButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(
                        new WindowEvent(parent, WindowEvent.WINDOW_CLOSING));
            }
        });

        int maxWidth = 0;
        int maxHeight = 0;
        for (JButton button : buttons) {
            maxWidth = Math.max(button.getMinimumSize().width, maxWidth);
            maxHeight = Math.max(button.getMinimumSize().height, maxHeight);
        }

        int wantedWidth = maxWidth + 10;
        int wantedHeight = maxHeight;
        for (JButton button : buttons) {
            button.setPreferredSize(new Dimension(wantedWidth, wantedHeight));
            leftPanel.add(button);
        }

        doneButton.setPreferredSize(new Dimension(wantedWidth, wantedHeight));
        doneButton.setEnabled(false);
        rightPanel.add(doneButton);
        buttonPanel.add(leftPanel);
        buttonPanel.add(rightPanel);

        return buttonPanel;
    }

    /**
     * Posts an event to the event queue to delete the currently selected
     * resource in {@link CachePane#cacheTable} after the {@code CachePane} and
     * {@link CacheViewer} have been instantiated and painted.
     * @see CachePane#cacheTable
     */
    private final void invokeLaterDelete() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    FileLock fl = null;
                    File netxRunningFile = new File(config.getProperty(DeploymentConfiguration.KEY_USER_NETX_RUNNING_FILE));
                    if (!netxRunningFile.exists()) {
                        try {
                            FileUtils.createParentDir(netxRunningFile);
                            FileUtils.createRestrictedFile(netxRunningFile, true);
                        } catch (IOException e1) {
                            OutputController.getLogger().log(OutputController.Level.ERROR_ALL, e1);
                        }
                    }

                    try {
                        fl = FileUtils.getFileLock(netxRunningFile.getPath(), false, false);
                    } catch (FileNotFoundException e1) {
                    }

                    int row = cacheTable.getSelectedRow();
                    try {
                        if (fl == null) return;
                        int modelRow = cacheTable.convertRowIndexToModel(row);
                        DirectoryNode fileNode = ((DirectoryNode) cacheTable.getModel().getValueAt(modelRow, 0));
                        if (fileNode.getFile().delete()) {
                            updateRecentlyUsed(fileNode.getFile());
                            fileNode.getParent().removeChild(fileNode);
                            FileUtils.deleteWithErrMesg(fileNode.getInfoFile());
                            ((NonEditableTableModel) cacheTable.getModel()).removeRow(modelRow);
                            cacheTable.getSelectionModel().clearSelection();
                            CacheDirectory.cleanParent(fileNode);
                        }
                    } catch (Exception exception) {
                        // ignore
                    }

                    if (fl != null) {
                        try {
                            fl.release();
                            fl.channel().close();
                        } catch (IOException e1) {
                            OutputController.getLogger().log(OutputController.Level.ERROR_ALL, e1);
                        }
                    }
                } catch (Exception exception) {
                        OutputController.getLogger().log(OutputController.Level.ERROR_DEBUG, exception);
                } finally {
                    // If nothing selected then keep deleteButton disabled
                    if (!cacheTable.getSelectionModel().isSelectionEmpty()) deleteButton.setEnabled(true);
                    // Enable buttons
                    refreshButton.setEnabled(true);
                    doneButton.setEnabled(true);
                    // If cacheTable is empty disable it and set background
                    // color to indicate being disabled
                    if (cacheTable.getModel().getRowCount() == 0) {
                        cacheTable.setEnabled(false);
                        cacheTable.setBackground(SystemColor.control);
                    }
                    // Reset cursor
                    parent.getContentPane().setCursor(Cursor.getDefaultCursor());
                }
            }

            private void updateRecentlyUsed(File f) {
                File recentlyUsedFile = new File(location + File.separator + CacheLRUWrapper.CACHE_INDEX_FILE_NAME);
                PropertiesFile pf = new PropertiesFile(recentlyUsedFile);
                pf.load();
                Enumeration<Object> en = pf.keys();
                while (en.hasMoreElements()) {
                    String key = (String) en.nextElement();
                    if (pf.get(key).equals(f.getAbsolutePath())) {
                        pf.remove(key);
                    }
                }
                pf.store();
            }
        });
    }

    /**
     * Posts an event to the event queue to populate the
     * {@link CachePane#cacheTable} after the {@code CachePane} and
     * {@link CacheViewer} have been instantiated and painted.
     * @see CachePane#populateTable
     */
    final void invokeLaterPopulateTable() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    populateTable();
                    // Disable cacheTable when no data to display, so no events are generated
                    if (cacheTable.getModel().getRowCount() == 0) {
                        cacheTable.setEnabled(false);
                        cacheTable.setBackground(SystemColor.control);
                        // No data in cacheTable, so nothing to delete
                        deleteButton.setEnabled(false);
                    } else {
                        cacheTable.setEnabled(true);
                        cacheTable.setBackground(SystemColor.text);
                    }
                } catch (Exception exception) {
                        OutputController.getLogger().log(OutputController.Level.ERROR_DEBUG, exception);
                } finally {
                    refreshButton.setEnabled(true);
                    doneButton.setEnabled(true);
                }
            }
        });
    }

    /**
     * Populate the table with fresh data. Any manual updates to the cache
     * directory will be updated in the table.
     */
    private void populateTable() {
        try {
            // Populating the cacheTable may take a while, so indicate busy by cursor
            parent.getContentPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

            NonEditableTableModel tableModel;
            (tableModel = (NonEditableTableModel)cacheTable.getModel()).setRowCount(0); //Clears the table
            for (Object[] v : generateData(root)) tableModel.addRow(v);
        } catch (Exception exception) {
            OutputController.getLogger().log(OutputController.Level.ERROR_DEBUG, exception);
        } finally {
            // Reset cursor
            parent.getContentPane().setCursor(Cursor.getDefaultCursor());
        }
    }

    /**
     * This creates the data for the table.
     * 
     * @param root The location of cache data.
     * @return ArrayList containing an Object array of data for each row in the table.
     */
    private ArrayList<Object[]> generateData(DirectoryNode root) {
        root = new DirectoryNode("Root", location, null);
        CacheDirectory.getDirStructure(root);
        ArrayList<Object[]> data = new ArrayList<Object[]>();

        for (DirectoryNode identifier : root.getChildren()) {
            for (DirectoryNode type : identifier.getChildren()) {
                for (DirectoryNode domain : type.getChildren()) {
                    for (DirectoryNode leaf : CacheDirectory.getLeafData(domain)) {
                        final File f = leaf.getFile();
                        Object[] o = {
                            leaf,
                            f.getParentFile(),
                            type,
                            domain,
                            f.length(),
                            new Date(f.lastModified())
                        };
                        data.add(o);
                    }
                }
            }
        }

        return data;
    }

    /**
     * Put focus onto default button.
     */
    public void focusOnDefaultButton() {
        if (defaultFocusComponent != null) {
            defaultFocusComponent.requestFocusInWindow();
        }
    }
}