/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  The ASF licenses this file to You
 * 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.
 * 
 */

package org.apache.jmeter.protocol.java.config.gui;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.chain.Command;
import org.apache.jmeter.config.Argument;
import org.apache.jmeter.config.Arguments;
import org.apache.jmeter.config.gui.AbstractConfigGui;
import org.apache.jmeter.config.gui.ArgumentsPanel;
import org.apache.jmeter.gui.util.HorizontalPanel;
import org.apache.jmeter.protocol.java.config.JavaConfig;
import org.apache.jmeter.protocol.java.sampler.JavaSampler;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.property.PropertyIterator;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.jorphan.reflect.ClassFinder;
import org.apache.log.Logger;

/**
 * The <code>ChainConfigGui</code> class provides the user interface for the
 * {@link JavaConfig}object.
 * 
 * @author Edgar Poce
 */
public class ChainConfigGui extends AbstractConfigGui implements ActionListener {
	/**
     * <code>serialVersionUID</code>
     */
    private static final long serialVersionUID = 3545799879432615731L;

    /** Logging */
	private static transient Logger log = LoggingManager.getLoggerForClass();

	/** The name of the classnameCombo JComboBox */
	private static final String CLASSNAMECOMBO = "chainclassnamecombo";

	/** A combo box allowing the user to choose a test class. */
	private JComboBox classnameCombo;

	/**
	 * Indicates whether or not the name of this component should be displayed
	 * as part of the GUI. If true, this is a standalone component. If false, it
	 * is embedded in some other component.
	 */
	private boolean displayName = true;

	/** A panel allowing the user to set arguments for this test. */
	private ArgumentsPanel argsPanel;

	/**
	 * Create a new JavaConfigGui as a standalone component.
	 */
	public ChainConfigGui() {
		this(true);
	}

	/**
	 * Create a new JavaConfigGui as either a standalone or an embedded
	 * component.
	 * 
	 * @param displayNameField
	 *            tells whether the component name should be displayed with the
	 *            GUI. If true, this is a standalone component. If false, this
	 *            component is embedded in some other component.
	 */
	public ChainConfigGui(boolean displayNameField) {
		this.displayName = displayNameField;
		init();
	}

	public String getLabelResource() {
		return "chain_config_title";
	}

	/**
	 * Initialize the GUI components and layout.
	 */
	protected void init() {
		setLayout(new BorderLayout(0, 5));

		if (displayName) {
			setBorder(makeBorder());
			add(makeTitlePanel(), BorderLayout.NORTH);
		}

		JPanel classnameRequestPanel = new JPanel(new BorderLayout(0, 5));
		classnameRequestPanel.add(createClassnamePanel(), BorderLayout.NORTH);
		classnameRequestPanel.add(createParameterPanel(), BorderLayout.CENTER);

		add(classnameRequestPanel, BorderLayout.CENTER);
	}

	/**
	 * Create a panel with GUI components allowing the user to select a test
	 * class.
	 * 
	 * @return a panel containing the relevant components
	 */
	private JPanel createClassnamePanel() {
		List possibleClasses = null;

		try {
			// Find all the classes which implement the JavaSamplerClient
			// interface.
			possibleClasses = ClassFinder.findClassesThatExtend(JMeterUtils
					.getSearchPaths(), new Class[] { Command.class });

			// Remove the JavaConfig class from the list since it only
			// implements the interface for error conditions.

			possibleClasses.remove(Command.class.getName()
					+ "$ErrorSamplerClient");
		} catch (Exception e) {
			log.debug("Exception getting interfaces.", e);
		}

		JLabel label = new JLabel(JMeterUtils
				.getResString("protocol_java_classname"));

		classnameCombo = new JComboBox(possibleClasses.toArray());
		classnameCombo.addActionListener(this);
		classnameCombo.setName(CLASSNAMECOMBO);
		classnameCombo.setEditable(false);
		label.setLabelFor(classnameCombo);

		HorizontalPanel panel = new HorizontalPanel();
		panel.add(label);
		panel.add(classnameCombo);

		return panel;
	}

	/**
	 * Handle action events for this component. This method currently handles
	 * events for the classname combo box.
	 * 
	 * @param evt
	 *            the ActionEvent to be handled
	 */
public void actionPerformed(ActionEvent evt)
    {
        if (evt.getSource() == classnameCombo)
        {
            String className =
                ((String) classnameCombo.getSelectedItem()).trim();
            try
            {
                Command command = (Command) Class.forName(
                            className,
                            true,
                            Thread.currentThread().getContextClassLoader()
                        ).newInstance();

                Arguments currArgs = new Arguments();
                argsPanel.modifyTestElement(currArgs);
                Map currArgsMap = currArgs.getArgumentsAsMap();

                Arguments newArgs = new Arguments();
                Arguments testParams = new Arguments();
                try
                {
                	Map descrip =  BeanUtils.describe(command) ;
                	Iterator iter = descrip.entrySet().iterator() ;
                	while (iter.hasNext()) {
						Map.Entry entry = (Map.Entry)iter.next();
						if (!entry.getKey().equals("type") && !entry.getKey().equals("class")) {
							String key = entry.getKey().toString() ;
							String value = ((entry.getValue()==null)?"":entry.getValue().toString()); 
							testParams.addArgument(new Argument(key, value)) ;
						}
						
					}
                }
                catch (AbstractMethodError e)
                {
                    log.warn ("JavaSamplerClient doesn't implement "
                            + "getDefaultParameters.  Default parameters won't "
                            + "be shown.  Please update your client class: "
                            + className);
                }
                
                if (testParams != null)
                {
                    PropertyIterator i = testParams.getArguments().iterator();
                    while (i.hasNext())
                    {
                        Argument arg = (Argument) i.next().getObjectValue();
                        String name = arg.getName();
                        String value = arg.getValue();

                        // If a user has set parameters in one test, and then
                        // selects a different test which supports the same
                        // parameters, those parameters should have the same
                        // values that they did in the original test.
                        if (currArgsMap.containsKey(name))
                        {
                            String newVal = (String) currArgsMap.get(name);
                            if (newVal != null
                                    && newVal.length() > 0)
                            {
                                value = newVal;
                            }
                        }
                        newArgs.addArgument(name, value);
                    }
                }

                argsPanel.configure(newArgs);
            }
            catch (Exception e)
            {
                log.error("Error getting argument list for " + className, e);
            }
        }
    }
	/**
	 * Create a panel containing components allowing the user to provide
	 * arguments to be passed to the test class instance.
	 * 
	 * @return a panel containing the relevant components
	 */
	private JPanel createParameterPanel() {
		argsPanel = new ArgumentsPanel(JMeterUtils.getResString("paramtable"));
		return argsPanel;
	}

	/* Overrides AbstractJMeterGuiComponent.configure(TestElement) */
	public void configure(TestElement config) {
		super.configure(config);

		argsPanel.configure((Arguments) config.getProperty(
				JavaSampler.ARGUMENTS).getObjectValue());

		classnameCombo.setSelectedItem(config
				.getPropertyAsString(JavaSampler.CLASSNAME));
	}

	/* Implements JMeterGUIComponent.createTestElement() */
	public TestElement createTestElement() {
        JavaConfig config = new JavaConfig();
		modifyTestElement(config);
		return config;
	}

	/* Implements JMeterGUIComponent.modifyTestElement(TestElement) */
	public void modifyTestElement(TestElement config) {
		configureTestElement(config);
		((JavaConfig) config).setArguments((Arguments) argsPanel
				.createTestElement());
        if (classnameCombo.getSelectedItem()!=null ) {
            ((JavaConfig) config).setClassname(classnameCombo.getSelectedItem()
                .toString());
        }
	}
}