package org.apache.jmeter.functions.gui;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.apache.jmeter.config.Argument;
import org.apache.jmeter.config.Arguments;
import org.apache.jmeter.config.gui.ArgumentsPanel;
import org.apache.jmeter.functions.Function;
import org.apache.jmeter.gui.action.ActionRouter;
import org.apache.jmeter.testelement.property.PropertyIterator;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.gui.ComponentUtil;
import org.apache.jorphan.gui.JLabeledChoice;
import org.apache.jorphan.gui.JLabeledTextField;
import org.apache.jorphan.reflect.ClassFinder;

/**
 * @version $Revision$
 */
public class FunctionHelper
    extends JDialog
    implements ActionListener, ChangeListener
{
    JLabeledChoice functionList;
    ArgumentsPanel parameterPanel;
    JLabeledTextField cutPasteFunction;
    private Map functionMap = new HashMap();
    JButton generateButton;

    public FunctionHelper()
    {
        super(
            (JFrame) null,
            JMeterUtils.getResString("function_helper_title"),
            false);
        init();
    }

    private void init()
    {
        parameterPanel =
            new ArgumentsPanel(JMeterUtils.getResString("function_params"));
        initializeFunctionList();
        this.getContentPane().setLayout(new BorderLayout(10, 10));
        JPanel comboPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        comboPanel.add(functionList);
        JButton helpButton = new JButton(JMeterUtils.getResString("help"));
        helpButton.addActionListener(new HelpListener());
        comboPanel.add(helpButton);
        this.getContentPane().add(comboPanel, BorderLayout.NORTH);
        this.getContentPane().add(parameterPanel, BorderLayout.CENTER);
        JPanel resultsPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        cutPasteFunction =
            new JLabeledTextField(
                JMeterUtils.getResString("cut_paste_function"),
                35);
        resultsPanel.add(cutPasteFunction);
        generateButton = new JButton(JMeterUtils.getResString("generate"));
        generateButton.addActionListener(this);
        resultsPanel.add(generateButton);
        this.getContentPane().add(resultsPanel, BorderLayout.SOUTH);
        this.pack();
        ComponentUtil.centerComponentInWindow(this);
    }

    private void initializeFunctionList()
    {
        try
        {
            List functionClasses =
                ClassFinder.findClassesThatExtend(
                    JMeterUtils.getSearchPaths(),
                    new Class[] { Function.class },
                    true);
            Iterator iter = functionClasses.iterator();
            String[] functionNames = new String[functionClasses.size()];
            int count = 0;
            while (iter.hasNext())
            {
                Class cl = Class.forName((String) iter.next());
                functionNames[count] =
                    ((Function) cl.newInstance()).getReferenceKey();
                functionMap.put(functionNames[count], cl);
                count++;
            }
            functionList =
                new JLabeledChoice(
                    JMeterUtils.getResString("choose_function"),
                    functionNames);
            functionList.addChangeListener(this);
        }
        catch (IOException e)
        {
        }
        catch (ClassNotFoundException e)
        {
        }
        catch (InstantiationException e)
        {
        }
        catch (IllegalAccessException e)
        {
        }
    }

    public void stateChanged(ChangeEvent event)
    {
        try
        {
            Arguments args = new Arguments();
            Function function =
                (Function) ((Class) functionMap.get(functionList.getText()))
                    .newInstance();
            List argumentDesc = function.getArgumentDesc();
            Iterator iter = argumentDesc.iterator();
            while (iter.hasNext())
            {
                String help = (String) iter.next();
                args.addArgument(help, "");
            }
            parameterPanel.configure(args);
            parameterPanel.revalidate();
            getContentPane().remove(parameterPanel);
            this.pack();
            getContentPane().add(parameterPanel, BorderLayout.CENTER);
            this.pack();
            this.validate();
            this.repaint();
        }
        catch (InstantiationException e)
        {
        }
        catch (IllegalAccessException e)
        {
        }
    }

    public void actionPerformed(ActionEvent e)
    {
        StringBuffer functionCall = new StringBuffer("${");
        functionCall.append(functionList.getText());
        Arguments args = (Arguments) parameterPanel.createTestElement();
        if (args.getArguments().size() > 0)
        {
            functionCall.append("(");
            PropertyIterator iter = args.iterator();
            boolean first = true;
            while (iter.hasNext())
            {
                Argument arg = (Argument) iter.next().getObjectValue();
                if (!first)
                {
                    functionCall.append(",");
                }
                functionCall.append((String) arg.getValue());
                first = false;
            }
            functionCall.append(")");
        }
        functionCall.append("}");
        cutPasteFunction.setText(functionCall.toString());
    }

    private class HelpListener implements ActionListener
    {
        public void actionPerformed(ActionEvent e)
        {
            String[] source =
                new String[] {
                    JMeterUtils.getJMeterHome()
                        + "/docs/usermanual/component_index.html",
                    functionList.getText()};
            ActionEvent helpEvent = new ActionEvent(source, e.getID(), "help");
            ActionRouter.getInstance().actionPerformed(helpEvent);
        }
    }
}

@@ -711,24 +711,66 @@
 tionRouter;%0A
+import org.apache.jmeter.gui.action.Help;%0A
 import org.a
@@ -6092,122 +6092,23 @@
 %5B%5D %7B
-%0A                    JMeterUtils.getJMeterHome()%0A                        + %22/docs/usermanual/component_index.html%22
+ Help.HELP_PAGE
 ,%0A  

Fix Help page URL (scheme was missing)