/*
 * Copyright 2001,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

import org.apache.axis.monitor.SOAPMonitorConstants;

/**
 * This is a SOAP Mointor Applet class.  This class provides
 * the user interface for displaying data from the SOAP
 * monitor service.
 *
 * @author Brian Price (pricebe@us.ibm.com)
 *
 */
public class SOAPMonitorApplet extends JApplet {

    /**
     * Private data
     */
    private JPanel      main_panel = null;
    private JTabbedPane tabbed_pane = null;
    private int         port = 0;
    private Vector      pages = null;

    /**
     * Constructor
     */
    public SOAPMonitorApplet() {
    }

    /**
     * Applet initialization
     */
    public void init() {
        // Get the port to be used
        String port_str = getParameter("port");
        if (port_str != null) {
            port = Integer.parseInt(port_str);
        }
        // Try to use the system look and feel
        try {
           UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e){
        }
        // Create main panel to hold notebook
        main_panel = new JPanel();
        main_panel.setBackground(Color.white);
        main_panel.setLayout(new BorderLayout());
        setContentPane(main_panel);
        // Create the notebook
        tabbed_pane = new JTabbedPane(JTabbedPane.TOP);
        main_panel.add(tabbed_pane,BorderLayout.CENTER);
        // Add notebook page for default host connection
        pages = new Vector();
        addPage(new SOAPMonitorPage(getCodeBase().getHost()));
    }

    /**
     * Add a page to the notebook
     */
    private void addPage(SOAPMonitorPage pg) {
        tabbed_pane.addTab("  "+pg.getHost()+"  ", pg);
        pages.addElement(pg);
    }

    /** 
     * Applet is being displayed 
     */
    public void start() {
        // Tell all pages to start talking to the server
        Enumeration e = pages.elements();
        while (e.hasMoreElements()) {
            SOAPMonitorPage pg = (SOAPMonitorPage) e.nextElement();
            if (pg != null) {
                pg.start();
            }
        }
    }

    /*
     * Applet is no longer displayed
     */
    public void stop() {
        // Tell all pages to stop talking to the server
        Enumeration e = pages.elements();
        while (e.hasMoreElements()) {
            SOAPMonitorPage pg = (SOAPMonitorPage) e.nextElement();
            if (pg != null) {
                pg.stop();
            }
        }
    }

    /**
     * Applet cleanup
     */
    public void destroy() {
        tabbed_pane = null;
        main_panel = null;
    }

    /**
     * This class provides the contents of a notebook page
     * representing a server connection.
     */
    class SOAPMonitorPage extends JPanel 
                          implements Runnable,
                                     ListSelectionListener,
                                     ActionListener {

        /**
         * Status Strings
         */
        private final String STATUS_ACTIVE    = "The SOAP Monitor is started.";
        private final String STATUS_STOPPED   = "The SOAP Monitor is stopped.";
        private final String STATUS_CLOSED    = "The server communication has been terminated.";
        private final String STATUS_NOCONNECT = "The SOAP Monitor is unable to communcate with the server.";

        /**
         * Private data
         */
        private String                host = null;
        private Socket                socket = null;
        private ObjectInputStream     in = null;
        private ObjectOutputStream    out = null;
        private SOAPMonitorTableModel model = null;
        private JTable                table = null;
        private JScrollPane           scroll = null;
        private JPanel                list_panel = null;
        private JPanel                list_buttons = null;
        private JButton               remove_button = null;
        private JButton               remove_all_button = null;
        private JButton               filter_button = null;
        private JPanel                details_panel = null;
        private JPanel                details_header = null;
        private JSplitPane            details_soap = null;
        private JPanel                details_buttons = null;
        private JLabel                details_time = null;
        private JLabel                details_target = null;
        private JLabel                details_status = null;
        private JLabel                details_time_value = null;
        private JLabel                details_target_value = null;
        private JLabel                details_status_value = null;
        private EmptyBorder           empty_border = null;
        private EtchedBorder          etched_border = null;
        private JPanel                request_panel = null;
        private JPanel                response_panel = null;
        private JLabel                request_label = null;
        private JLabel                response_label = null;
        private SOAPMonitorTextArea   request_text = null;
        private SOAPMonitorTextArea   response_text = null;
        private JScrollPane           request_scroll = null;
        private JScrollPane           response_scroll = null;
        private JButton               layout_button = null;
        private JSplitPane            split = null;
        private JPanel                status_area = null;
        private JPanel                status_buttons = null;
        private JButton               start_button = null;
        private JButton               stop_button = null;
        private JLabel                status_text = null;
        private JPanel                status_text_panel = null;
        private SOAPMonitorFilter     filter = null;
        private GridBagLayout         details_header_layout = null;
        private GridBagConstraints    details_header_constraints = null;
        private JCheckBox             reflow_xml = null;

        /**
         * Constructor (create and layout page)
         */
        public SOAPMonitorPage(String host_name) {
            host = host_name;
            // Set up default filter (show all messages)
            filter = new SOAPMonitorFilter();
            // Use borders to help improve appearance
            etched_border = new EtchedBorder();
            // Build top portion of split (list panel) 
            model = new SOAPMonitorTableModel();
            table = new JTable(model);
            table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            table.setRowSelectionInterval(0,0);
            table.setPreferredScrollableViewportSize(new Dimension(600, 96));
            table.getSelectionModel().addListSelectionListener(this);
            scroll = new JScrollPane(table);
            remove_button = new JButton("Remove");
            remove_button.addActionListener(this);
            remove_button.setEnabled(false);
            remove_all_button = new JButton("Remove All");
            remove_all_button.addActionListener(this);
            filter_button = new JButton("Filter ...");
            filter_button.addActionListener(this);
            list_buttons = new JPanel();
            list_buttons.setLayout(new FlowLayout());
            list_buttons.add(remove_button);
            list_buttons.add(remove_all_button);
            list_buttons.add(filter_button);
            list_panel = new JPanel();
            list_panel.setLayout(new BorderLayout());
            list_panel.add(scroll,BorderLayout.CENTER);
            list_panel.add(list_buttons, BorderLayout.SOUTH);
            list_panel.setBorder(empty_border);
            // Build bottom portion of split (message details) 
            details_time = new JLabel("Time: ", SwingConstants.RIGHT);
            details_target = new JLabel("Target Service: ", SwingConstants.RIGHT);
            details_status = new JLabel("Status: ", SwingConstants.RIGHT);
            details_time_value = new JLabel();
            details_target_value = new JLabel();
            details_status_value = new JLabel();
            Dimension preferred_size = details_time.getPreferredSize();
            preferred_size.width = 1;
            details_time.setPreferredSize(preferred_size); 
            details_target.setPreferredSize(preferred_size); 
            details_status.setPreferredSize(preferred_size); 
            details_time_value.setPreferredSize(preferred_size); 
            details_target_value.setPreferredSize(preferred_size); 
            details_status_value.setPreferredSize(preferred_size);
            details_header = new JPanel();
            details_header_layout = new GridBagLayout();
            details_header.setLayout(details_header_layout);
            details_header_constraints = new GridBagConstraints();
            details_header_constraints.fill=GridBagConstraints.BOTH;
            details_header_constraints.weightx=0.5;
            details_header_layout.setConstraints(details_time,details_header_constraints);
            details_header.add(details_time);
            details_header_layout.setConstraints(details_time_value,details_header_constraints);
            details_header.add(details_time_value);
            details_header_layout.setConstraints(details_target,details_header_constraints);
            details_header.add(details_target);
            details_header_constraints.weightx=1.0;
            details_header_layout.setConstraints(details_target_value,details_header_constraints);
            details_header.add(details_target_value);
            details_header_constraints.weightx=.5;
            details_header_layout.setConstraints(details_status,details_header_constraints);
            details_header.add(details_status);
            details_header_layout.setConstraints(details_status_value,details_header_constraints);
            details_header.add(details_status_value);
            details_header.setBorder(etched_border);
            request_label = new JLabel("SOAP Request", SwingConstants.CENTER);
            request_text = new SOAPMonitorTextArea();
            request_text.setEditable(false);
            request_scroll = new JScrollPane(request_text);
            request_panel = new JPanel();
            request_panel.setLayout(new BorderLayout());
            request_panel.add(request_label, BorderLayout.NORTH);
            request_panel.add(request_scroll, BorderLayout.CENTER);
            response_label = new JLabel("SOAP Response", SwingConstants.CENTER);
            response_text = new SOAPMonitorTextArea();
            response_text.setEditable(false);
            response_scroll = new JScrollPane(response_text);
            response_panel = new JPanel();
            response_panel.setLayout(new BorderLayout());
            response_panel.add(response_label, BorderLayout.NORTH);
            response_panel.add(response_scroll, BorderLayout.CENTER);
            details_soap = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
            details_soap.setTopComponent(request_panel);
            details_soap.setRightComponent(response_panel);
            details_soap.setResizeWeight(.5);
            details_panel = new JPanel();
            layout_button = new JButton("Switch Layout");
            layout_button.addActionListener(this);
            reflow_xml = new JCheckBox("Reflow XML text");
            reflow_xml.addActionListener(this);
            details_buttons = new JPanel();
            details_buttons.setLayout(new FlowLayout());
            details_buttons.add(reflow_xml);
            details_buttons.add(layout_button);
            details_panel.setLayout(new BorderLayout());
            details_panel.add(details_header,BorderLayout.NORTH);
            details_panel.add(details_soap,BorderLayout.CENTER);
            details_panel.add(details_buttons,BorderLayout.SOUTH);
            details_panel.setBorder(empty_border);
            // Add the two parts to the age split pane
            split = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
            split.setTopComponent(list_panel);
            split.setRightComponent(details_panel);
            // Build status area
            start_button = new JButton("Start");
            start_button.addActionListener(this);
            stop_button = new JButton("Stop");
            stop_button.addActionListener(this);
            status_buttons = new JPanel();
            status_buttons.setLayout(new FlowLayout());
            status_buttons.add(start_button);
            status_buttons.add(stop_button);
            status_text = new JLabel();
            status_text.setBorder(new BevelBorder(BevelBorder.LOWERED));
            status_text_panel = new JPanel();
            status_text_panel.setLayout(new BorderLayout());
            status_text_panel.add(status_text, BorderLayout.CENTER);
            status_text_panel.setBorder(empty_border);
            status_area = new JPanel();
            status_area.setLayout(new BorderLayout());
            status_area.add(status_buttons, BorderLayout.WEST);
            status_area.add(status_text_panel, BorderLayout.CENTER);
            status_area.setBorder(etched_border);
            // Add the split and status area to page
            setLayout(new BorderLayout());
            add(split, BorderLayout.CENTER);
            add(status_area, BorderLayout.SOUTH);
        }

        /**
         * Get the name of the host we are displaying
         */
        public String getHost() {
            return host;
        }

        /**
         * Set the status text
         */
        public void setStatus(String txt) {
            status_text.setForeground(Color.black);
            status_text.setText("  "+txt);
        }

        /**
         * Set the status text to an error
         */
        public void setErrorStatus(String txt) {
            status_text.setForeground(Color.red);
            status_text.setText("  "+txt);
        }

        /**
         * Start talking to the server
         */
        public void start() {
            String codehost = getCodeBase().getHost();
            if (socket == null) {
                try {
                    // Open the socket to the server
                    socket = new Socket(codehost, port);
                    // Create output stream
                    out = new ObjectOutputStream(socket.getOutputStream());
                    out.flush();
                    // Create input stream and start background
                    // thread to read data from the server
                    in = new ObjectInputStream(socket.getInputStream());
                    new Thread(this).start();
                } catch (Exception e) {
                    // Exceptions here are unexpected, but we can't
                    // really do anything (so just write it to stdout
                    // in case someone cares and then ignore it)
                    System.out.println("Exception! "+e.toString());
                    e.printStackTrace();
                    setErrorStatus(STATUS_NOCONNECT);
                    socket = null;
                }