/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included with this distribution in
 * the LICENSE file.
 */
package server.ftp.gui;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.JButton;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;

import gui.GuiUtils;
import io.IoUtils;
import server.ftp.FtpConfig;
import server.ftp.FtpUser;

/**
 * This panel holds all connection spy panels.
 * 
 * @author <a href="mailto:rana_b@yahoo.com">Rana Bhattacharyya</a>
 */
public
class FtpSpyContainerPanel extends PluginPanel {
  
    public final static String SPY_PAGE = "server/ftp/gui/spy.html";
  
    private JTabbedPane mjTabbedPane   = null;
    
    private JButton mjClearButton      = null;
    private JButton mjCloseButton      = null;
    private JButton mjDisconnectButton = null;
    private JScrollPane mjAboutPane    = null;
    
    private FtpConfig mConfig          = null;
    
    /**
     * Constructor - create empty tabbed frame
     */
    public FtpSpyContainerPanel(FtpTree tree) {
        super(tree);
        initComponents();
    }
    
    /**
     * Initialize all components
     */
    private void initComponents() {
        setLayout(new BorderLayout());
        mjTabbedPane = new JTabbedPane();
        mjTabbedPane.setPreferredSize(new Dimension(470, 340));
        add(mjTabbedPane, BorderLayout.CENTER);
        
        JPanel bottomPane = new JPanel();
        bottomPane.setLayout(new FlowLayout(FlowLayout.CENTER));
        
        mjClearButton = new JButton("Clear");
        bottomPane.add(mjClearButton);
        mjClearButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent evt) {
                clearLog();
             }
        });
        
        mjDisconnectButton = new JButton("Disconnect");
        bottomPane.add(mjDisconnectButton);
        mjDisconnectButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent evt) {
                disconnectUser();
             }
        });
        
        mjCloseButton = new JButton("Close");
        bottomPane.add(mjCloseButton);
        mjCloseButton.addActionListener(new ActionListener() {
             public void actionPerformed(ActionEvent evt) {
                closePane();
             }
        });
        add(bottomPane, BorderLayout.SOUTH);
        
        // initialize component to be displayed if 
        // there is no currently monitored connection
        JEditorPane editorPane = new JEditorPane();
        editorPane.setEditable(false);
        editorPane.setContentType("text/html");
        InputStream is = null;
        try {
            is = getClass().getClassLoader().getResourceAsStream(SPY_PAGE);
            if (is != null) {
                editorPane.read(is, null);
            }
        }
        catch(IOException ex) {
        }
        finally {
            IoUtils.close(is);
        }
        
        mjAboutPane = new JScrollPane(editorPane, 
                    JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                    JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        mjTabbedPane.addTab("Spy", mjAboutPane);        
                
    }
       
    
    /**
     * Clear user log
     */
    private void clearLog() {
        Component selComp = mjTabbedPane.getSelectedComponent();
        if ( (selComp != null) && (selComp != mjAboutPane) ) {
            ((SpyPanel)selComp).clearLog();
        }
    }
     
    /**
     * Close connection spy panel.
     */ 
    private void closePane() {
        Component selComp = mjTabbedPane.getSelectedComponent();
        if ( (selComp != null) && (selComp != mjAboutPane) ) {
            ((SpyPanel)selComp).closePane();
            mjTabbedPane.remove(selComp);
            if (mjTabbedPane.getTabCount() == 0) {
                mjTabbedPane.addTab("Spy", mjAboutPane);
            }
        }
    }
    
    /**
     * Disconnected user connection
     */
    private void disconnectUser() {
        Component selComp = mjTabbedPane.getSelectedComponent();
        if ( (selComp != null) && (selComp != mjAboutPane) ) {
            boolean bConf = GuiUtils.getConfirmation(getTree().getRootPanel(), "Do you want to close the connection?");
            if(bConf) {
                ((SpyPanel)selComp).disconnect();
            }
        }
    }
    
    /**
     * Monitor connection
     */
    public void monitorConnection(FtpUser user) {    
        String userName    = getName(user);
        String userSession = user.getSessionId(); 
        
        // don't add another tab if already being monitored
        int tabCount = mjTabbedPane.getTabCount();
        for(int i=0; i<tabCount; i++) {
            Component selComp = mjTabbedPane.getComponentAt(i);
            if ( (selComp != null) && (selComp != mjAboutPane) ) {
                String tabUserSessionId = ((SpyPanel)selComp).getSessionId();
                if (tabUserSessionId.equals(userSession)) {
                    mjTabbedPane.setTitleAt(i, userName);
                    mjTabbedPane.setSelectedIndex(i);
                    return;
                }
            }
        }
        
        // add new tab
        SpyPanel spyPane = new SpyPanel(mConfig, userSession);
        mjTabbedPane.remove(mjAboutPane);
        mjTabbedPane.add(userName, spyPane);
        mjTabbedPane.setSelectedComponent(spyPane);
    } 
    
    /**
     * Get name
     */
    private String getName(FtpUser user) {
        String name = "";
        if (user != null) {
            name = user.getName();
            if (name == null) {
                name = "UNKNOWN";
            }
        }
        return name;
    } 
    
    /**
     * Refresh panel
     */
    public void refresh(FtpConfig config) {
        mConfig = config;
        int tabCount = mjTabbedPane.getTabCount();
        for(int i=0; i<tabCount; i++) {
            Component selComp = mjTabbedPane.getComponentAt(i);
            if ( (selComp != null) && (selComp != mjAboutPane) ) {
                ((SpyPanel)selComp).closePane();
                mjTabbedPane.remove(selComp);
            }
        }
        
        if (mjTabbedPane.getTabCount() == 0) {
            mjTabbedPane.addTab("Spy", mjAboutPane);
        }
    }  
    
    /**
     * Not displayable when server stopped
     */
    public boolean isDisplayable() {
        return mConfig != null;
    } 
     
}