/*
 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
 * Copyright (C) $$Year-Rel$$ The Jalview Authors
 * 
 * This file is part of Jalview.
 * 
 * Jalview 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 3
 * of the License, or (at your option) any later version.
 *  
 * Jalview 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 Jalview.  If not, see <http://www.gnu.org/licenses/>.
 * The Jalview Authors are detailed in the 'AUTHORS' file.
 */
package jalview.gui;

import jalview.util.MessageManager;
import jalview.ws.params.ArgumentI;
import jalview.ws.params.OptionI;
import jalview.ws.params.ParameterI;
import jalview.ws.params.ValueConstrainI;
import jalview.ws.params.ValueConstrainI.ValueType;
import jalview.ws.params.simple.LogarithmicParameter;
import jalview.ws.params.simple.StringParameter;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.net.URL;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import net.miginfocom.swing.MigLayout;

/**
 * GUI generator/manager for options and parameters. Originally abstracted from
 * the WsJobParameters dialog box.
 * 
 * @author jprocter
 * 
 */
public class OptsAndParamsPage
{
  public static final int PARAM_WIDTH = 340;

  public static final int PARAM_HEIGHT = 150;

  public static final int PARAM_CLOSEDHEIGHT = 80;

  URL linkImageURL = getClass().getResource("/images/link.gif");

  Map<String, OptionBox> optSet = new LinkedHashMap<>();

  Map<String, ParamBox> paramSet = new LinkedHashMap<>();

  /*
   * compact or verbose style parameters
   */
  boolean compact = false;

  OptsParametersContainerI poparent;

  /**
   * A class that models a panel rendering a single option (checkbox or choice
   * list)
   */
  public class OptionBox extends JPanel
          implements MouseListener, ActionListener
  {
    JCheckBox enabled;

    final URL finfo;

    boolean hasLink = false;

    boolean initEnabled = false;

    String initVal = null;

    OptionI option;

    JComboBox<String> val;

    public OptionBox(OptionI opt)
    {
      option = opt;
      setLayout(new FlowLayout(FlowLayout.LEFT));
      enabled = new JCheckBox();
      enabled.setSelected(opt.isRequired()); // TODO: lock required options
      enabled.setFont(new Font("Verdana", Font.PLAIN, 11));
      enabled.setText("");
      enabled.setText(opt.getName());
      enabled.addActionListener(this);
      finfo = option.getFurtherDetails();
      String desc = opt.getDescription();
      if (finfo != null)
      {
        hasLink = true;

        enabled.setToolTipText(JvSwingUtils.wrapTooltip(true,
                ((desc == null || desc.trim().length() == 0)
                        ? MessageManager.getString(
                                "label.opt_and_params_further_details")
                        : desc) + "<br><img src=\"" + linkImageURL
                        + "\"/>"));
        enabled.addMouseListener(this);
      }
      else
      {
        if (desc != null && desc.trim().length() > 0)
        {
          enabled.setToolTipText(
                  JvSwingUtils.wrapTooltip(true, opt.getDescription()));
        }
      }
      add(enabled);

      // todo combo or radio buttons?
      val = new JComboBox<>();
      for (String str : opt.getPossibleValues())
      {
        val.addItem(str);
      }
      val.setSelectedItem(opt.getValue());
      if (opt.getPossibleValues().size() > 1 || opt.isRequired())
      {
        val.addActionListener(this);
        add(val);
      }
      // TODO: add actionListeners for popup (to open further info),
      // and to update list of parameters if an option is enabled
      // that takes a value. JBPNote: is this TODO still valid ?
      setInitialValue();
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
      if (e.getSource() != enabled)
      {
        enabled.setSelected(true);
      }
      checkIfModified();
    }

    private void checkIfModified()
    {
      boolean notmod = (initEnabled == enabled.isSelected());
      if (enabled.isSelected())
      {
        if (initVal != null)
        {
          notmod &= initVal.equals(val.getSelectedItem());
        }
        else
        {
          // compare against default service setting
          notmod &= option.getValue() == null
                  || option.getValue().equals(val.getSelectedItem());
        }
      }
      else
      {
        notmod &= (initVal != null) ? initVal.equals(val.getSelectedItem())
                : val.getSelectedItem() != initVal;
      }
      poparent.argSetModified(this, !notmod);
    }

    public OptionI getOptionIfEnabled()
    {
      if (!enabled.isSelected())
      {
        return null;
      }
      OptionI opt = option.copy();
      if (opt.getPossibleValues() != null
              && opt.getPossibleValues().size() == 1)
      {
        // Hack to make sure the default value for an enabled option with only
        // one value is actually returned
        opt.setValue(opt.getPossibleValues().get(0));
      }
      if (val.getSelectedItem() != null)
      {
        opt.setValue((String) val.getSelectedItem());
      }
      else
      {
        if (option.getValue() != null)
        {
          opt.setValue(option.getValue());
        }
      }
      return opt;
    }

    @Override
    public void mouseClicked(MouseEvent e)
    {
      if (e.isPopupTrigger()) // for Windows
      {
        showUrlPopUp(this, finfo.toString(), e.getX(), e.getY());
      }
    }

    @Override
    public void mouseEntered(MouseEvent e)
    {
    }

    @Override
    public void mouseExited(MouseEvent e)
    {
    }

    @Override
    public void mousePressed(MouseEvent e)
    {
      if (e.isPopupTrigger()) // Mac
      {
        showUrlPopUp(this, finfo.toString(), e.getX(), e.getY());
      }
    }

    @Override
    public void mouseReleased(MouseEvent e)
    {
    }

    public void resetToDefault(boolean setDefaultParams)
    {
      enabled.setSelected(false);
      if (option.isRequired()
              || (setDefaultParams && option.getValue() != null))
      {
        // Apply default value
        selectOption(option, option.getValue());
      }
    }

    public void setInitialValue()
    {
      initEnabled = enabled.isSelected();
      if (option.getPossibleValues() != null
              && option.getPossibleValues().size() > 1)
      {
        initVal = (String) val.getSelectedItem();
      }
      else
      {
        initVal = (initEnabled) ? (String) val.getSelectedItem() : null;
      }
    }

    /**
     * toString representation for identification in the debugger only
     */
    @Override
    public String toString()
    {
      return option == null ? super.toString() : option.toString();
    }

  }

  /**
   * A class that models a panel rendering a single parameter
   */
  public class ParamBox extends JPanel
          implements ChangeListener, ActionListener, MouseListener
  {
    /*
     * parameter values (or their logs) are multiplied by this
     * scaling factor to ensure an integer range for the slider
     */
    private int sliderScaleFactor = 1;

    boolean isLogarithmicParameter;

    boolean isChoiceParameter;

    boolean isIntegerParameter;

    boolean isStringParameter;

    boolean adjusting;

    JComboBox<String> choicebox;

    JPanel controlsPanel = new JPanel();

    boolean descriptionIsVisible = false;

    JScrollPane descPanel = new JScrollPane();

    final URL finfo;

    Object lastVal;

    ParameterI parameter;

    final OptsParametersContainerI pmdialogbox;

    JPanel settingPanel = new JPanel();

    JSlider slider;

    JTextArea descriptionText = new JTextArea();

    ValueConstrainI validator;

    JTextField valueField;

    private String descTooltip;

    public ParamBox(final OptsParametersContainerI paramContainer,
            ParameterI parm)
    {
      pmdialogbox = paramContainer;
      finfo = parm.getFurtherDetails();
      validator = parm.getValidValue();
      parameter = parm;

      isLogarithmicParameter = parm instanceof LogarithmicParameter;

      if (validator != null)
      {
        ValueType type = validator.getType();
        isIntegerParameter = type == ValueType.Integer;
        isStringParameter = type == ValueType.String;

        /*
         * ensure slider has an integer range corresponding to
         * the min-max range of the parameter
         */
        if (validator.getMin() != null && validator.getMax() != null
        // && !isIntegerParameter
                && !isStringParameter)
        {
          double min = validator.getMin().doubleValue();
          double max = validator.getMax().doubleValue();
          if (isLogarithmicParameter)
          {
            min = Math.log(min);
            max = Math.log(max);
          }
          sliderScaleFactor = (int) (1000000 / (max - min));
          // todo scaleMin, scaleMax could also be final fields
        }
      }

      List<String> possibleValues = parameter.getPossibleValues();
      isChoiceParameter = possibleValues != null
              && possibleValues.size() > 1;

      if (compact)
      {
        addCompactParameter(parm);
      }
      else
      {
        addExpandableParam(parm);
      }
    }

    /**
     * Adds a 'compact' format parameter, with any help text shown as a tooltip
     * 
     * @param parm
     */
    private void addCompactParameter(ParameterI parm)
    {
      setLayout(new MigLayout("", "[][grow]"));
      String ttipText = null;

      controlsPanel.setLayout(new BorderLayout());

      if (parm.getDescription() != null
              && parm.getDescription().trim().length() > 0)
      {
        ttipText = (JvSwingUtils.wrapTooltip(true,
                parm.getDescription() + (finfo != null ? "<br><img src=\""
                        + linkImageURL + "\"/>"
                        + MessageManager.getString(
                                "label.opt_and_params_further_details")
                        : "")));
      }

      JvSwingUtils.addtoLayout(this, ttipText, new JLabel(parm.getName()),
              controlsPanel, "");
      updateControls(parm);
      validate();
    }

    /**
     * Adds an 'expanded' format parameter, with any help shown in a panel that
     * may be shown or hidden
     * 
     * @param parm
     */
    private void addExpandableParam(ParameterI parm)
    {
      setPreferredSize(new Dimension(PARAM_WIDTH, PARAM_CLOSEDHEIGHT));
      setBorder(new TitledBorder(parm.getName()));
      setLayout(null);
      descriptionText.setFont(new Font("Verdana", Font.PLAIN, 11));
      descriptionText.setBackground(getBackground());

      descriptionText.setEditable(false);
      descPanel.getViewport().setView(descriptionText);

      descPanel.setVisible(false);

      JPanel firstrow = new JPanel();
      firstrow.setLayout(null);
      controlsPanel.setLayout(new BorderLayout());
      controlsPanel.setBounds(new Rectangle(39, 10, PARAM_WIDTH - 70,
              PARAM_CLOSEDHEIGHT - 50));
      firstrow.add(controlsPanel);
      firstrow.setBounds(new Rectangle(10, 20, PARAM_WIDTH - 30,
              PARAM_CLOSEDHEIGHT - 30));

      if (parm.getDescription() != null
              && parm.getDescription().trim().length() > 0)
      {
        addExpandableHelp(firstrow, parm);
      }
      add(firstrow);
      validator = parm.getValidValue();
      parameter = parm;
      if (validator != null)
      {
        isIntegerParameter = validator.getType() == ValueType.Integer;
      }
      else
      {
        if (parameter.getPossibleValues() != null)
        {
          isChoiceParameter = true;
        }
      }
      updateControls(parm);
      descPanel.setBounds(new Rectangle(10, PARAM_CLOSEDHEIGHT,
              PARAM_WIDTH - 20, PARAM_HEIGHT - PARAM_CLOSEDHEIGHT - 5));
      add(descPanel);
      validate();
    }

    /**
     * Adds a button which can be clicked to show or hide help text
     * 
     * @param container
     * @param param
     */
    protected void addExpandableHelp(JPanel container, ParameterI param)
    {
      JButton showDescBtn = new JButton("+");
      showDescBtn.setFont(new Font("Verdana", Font.PLAIN, 8));
      if (finfo != null)
      {
        descTooltip = JvSwingUtils.wrapTooltip(true,
                MessageManager.formatMessage(
                        "label.opt_and_params_show_brief_desc_image_link",
                        new String[]
                        { linkImageURL.toExternalForm() }));
        showDescBtn.addMouseListener(this);
      }
      else
      {
        descTooltip = JvSwingUtils.wrapTooltip(true, MessageManager
                .getString("label.opt_and_params_show_brief_desc"));
      }
      showDescBtn.setToolTipText(descTooltip);
      showDescBtn.addActionListener(new ActionListener()
      {
        @Override
        public void actionPerformed(ActionEvent e)
        {
          descriptionIsVisible = !descriptionIsVisible;
          showDescBtn.setText(descriptionIsVisible ? "-" : "+");
          showDescBtn.setToolTipText(
                  descriptionIsVisible ? null : descTooltip);
          descPanel.setVisible(descriptionIsVisible);
          descPanel.getVerticalScrollBar().setValue(0);
          ParamBox.this.setPreferredSize(new Dimension(PARAM_WIDTH,
                  (descriptionIsVisible) ? PARAM_HEIGHT
                          : PARAM_CLOSEDHEIGHT));
          ParamBox.this.validate();
          pmdialogbox.refreshParamLayout();
        }
      });
      descriptionText.setWrapStyleWord(true);
      descriptionText.setLineWrap(true);
      descriptionText.setColumns(32);
      descriptionText.setText(param.getDescription());
      showDescBtn.setBounds(new Rectangle(10, 10, 16, 16));
      container.add(showDescBtn);
    }

    @Override
    public void actionPerformed(ActionEvent e)
    {
      if (adjusting)
      {
        return;
      }
      if (!isChoiceParameter)
      {
        updateSliderFromValueField();
      }
      checkIfModified();
    }

    /**
     * Checks whether the value of this parameter has been changed and notifies
     * the parent page accordingly
     */
    private void checkIfModified()
    {
      Object newValue = updateSliderFromValueField();
      boolean modified = true;
      if (newValue.getClass() == lastVal.getClass())
      {
        modified = !newValue.equals(lastVal);
      }
      pmdialogbox.argSetModified(this, modified);
    }

    @Override
    public int getBaseline(int width, int height)
    {
      return 0;
    }

    // from
    // http://stackoverflow.com/questions/2743177/top-alignment-for-flowlayout
    // helpful hint of using the Java 1.6 alignBaseLine property of FlowLayout
    @Override
    public Component.BaselineResizeBehavior getBaselineResizeBehavior()
    {
      return Component.BaselineResizeBehavior.CONSTANT_ASCENT;
    }

    public ParameterI getParameter()
    {
      ParameterI prm = parameter.copy();
      if (isChoiceParameter)
      {
        prm.setValue((String) choicebox.getSelectedItem());
      }
      else
      {
        prm.setValue(valueField.getText());
      }
      return prm;
    }

    public void init()
    {
      // reset the widget's initial value.
      lastVal = null;
    }

    @Override
    public void mouseClicked(MouseEvent e)
    {
      if (e.isPopupTrigger()) // for Windows
      {
        showUrlPopUp(this, finfo.toString(), e.getX(), e.getY());
      }
    }

    @Override
    public void mouseEntered(MouseEvent e)
    {
    }

    @Override
    public void mouseExited(MouseEvent e)
    {
    }

    @Override
    public void mousePressed(MouseEvent e)
    {
      if (e.isPopupTrigger()) // for Mac
      {
        showUrlPopUp(this, finfo.toString(), e.getX(), e.getY());
      }
    }

    @Override
    public void mouseReleased(MouseEvent e)
    {
    }

    @Override
    public void stateChanged(ChangeEvent e)
    {
      if (!adjusting)
      {
        if (!isLogarithmicParameter)
        {
          /*
           * set (int or float formatted) text field value
           */
          valueField.setText(isIntegerParameter
                  ? String.valueOf(slider.getValue())
                  : formatDouble(
                          slider.getValue() / (float) sliderScaleFactor));
        }
        else
        {
          double value = Math.pow(Math.E,
                  slider.getValue() / (double) sliderScaleFactor);
          valueField.setText(formatDouble(value));
        }
        checkIfModified();
      }
    }

    /**
     * Answers the value formatted as a string to 3 decimal places - in
     * scientific notation if the value is less than 0.001
     * 
     * @param value
     * @return
     */
    String formatDouble(double value)
    {
      String format = value < 0.001 ? "%3.1E" : "%3.3f";
      return String.format(format, value);
    }

    /**
     * Formats a number as integer or float (3dp) or scientific notation (1dp)
     * 
     * @param n
     * @return
     */
    String formatNumber(Number n)
    {
      return n instanceof Integer ? String.valueOf(n.intValue())
              : formatDouble(n.doubleValue());
    }

    void updateControls(ParameterI parm)
    {
      adjusting = true;
      boolean init = (choicebox == null && valueField == null);
      if (init)
      {
        if (isChoiceParameter)
        {
          choicebox = new JComboBox<>();
          choicebox.addActionListener(this);
          controlsPanel.add(choicebox, BorderLayout.CENTER);
        }
        else
        {
          slider = new JSlider();
          slider.addChangeListener(this);
          int cols = parm instanceof StringParameter ? 20 : 0;
          valueField = new JTextField(cols);
          valueField.addActionListener(this);
          valueField.addKeyListener(new KeyAdapter()
          {
            @Override
            public void keyReleased(KeyEvent e)
            {
              int keyCode = e.getKeyCode();
              if (e.isActionKey() && keyCode != KeyEvent.VK_LEFT
                      && keyCode != KeyEvent.VK_RIGHT)
              {
                if (valueField.getText().trim().length() > 0)
                {
                  actionPerformed(null);
                }
              }
            }
          });
          valueField.setPreferredSize(new Dimension(65, 25));
          controlsPanel.add(slider, BorderLayout.WEST);
          controlsPanel.add(valueField, BorderLayout.EAST);
        }
      }

      if (parm != null)
      {
        if (isChoiceParameter)
        {
          if (init)
          {
            for (String val : parm.getPossibleValues())
            {
              choicebox.addItem(val);
            }
          }
          if (parm.getValue() != null)
          {
            choicebox.setSelectedItem(parm.getValue());
          }
        }
        else
        {
          valueField.setText(parm.getValue());
        }
      }
      lastVal = updateSliderFromValueField();
      adjusting = false;
    }

    /**
     * Action depends on the type of the input parameter:
     * <ul>
     * <li>if a text input, returns the trimmed value</li>
     * <li>if a choice list, returns the selected value</li>
     * <li>if a value slider and input field, sets the value of the slider from
     * the value in the text field, limiting it to any defined min-max
     * range.</li>
     * </ul>
     * Answers the (possibly modified) input value, as a String, Integer, Float
     * or Double.
     * 
     * @return
     */
    Object updateSliderFromValueField()
    {
      if (validator == null || isStringParameter)
      {
        if (isChoiceParameter)
        {
          return choicebox.getSelectedItem();
        }
        slider.setVisible(false);
        return valueField.getText().trim();
      }

      valueField.setText(valueField.getText().trim());

      /*
       * ensure not outside min-max range
       * TODO: provide some visual indicator if limit reached
       */
      try
      {
        valueField.setBackground(Color.WHITE);
        double d = Double.parseDouble(valueField.getText());
        if (validator.getMin() != null
                && validator.getMin().doubleValue() > d)
        {
          valueField.setText(formatNumber(validator.getMin()));
        }
        if (validator.getMax() != null
                && validator.getMax().doubleValue() < d)
        {
          valueField.setText(formatNumber(validator.getMax()));
        }
      } catch (NumberFormatException e)
      {
        valueField.setBackground(Color.yellow);
        return Float.NaN;
      }

      if (isIntegerParameter)
      {
        int iVal = 0;
        try
        {
          iVal = Integer.valueOf(valueField.getText());
        } catch (Exception e)
        {
          valueField.setBackground(Color.yellow);
          return Integer.valueOf(0);
        }

        if (validator.getMin() != null && validator.getMax() != null)
        {
          slider.getModel().setRangeProperties(iVal, 1,
                  validator.getMin().intValue(),
                  validator.getMax().intValue() + 1, true);
        }
        else
        {
          slider.setVisible(false);
        }
        return new Integer(iVal);
      }

      if (isLogarithmicParameter)
      {
        double dVal = 0d;
        try
        {
          double eValue = Double.valueOf(valueField.getText());
          dVal = Math.log(eValue) * sliderScaleFactor;
        } catch (Exception e)
        {
          // shouldn't be possible here
          valueField.setBackground(Color.yellow);
          return Double.NaN;
        }
        if (validator.getMin() != null && validator.getMax() != null)
        {
          double scaleMin = Math.log(validator.getMin().doubleValue())
                  * sliderScaleFactor;
          double scaleMax = Math.log(validator.getMax().doubleValue())
                  * sliderScaleFactor;
          slider.getModel().setRangeProperties((int) (dVal), 1,
                  (int) scaleMin, 1 + (int) scaleMax, true);
        }
        else
        {
          slider.setVisible(false);
        }
        return new Double(dVal);
      }

      float fVal = 0f;
      try
      {
        fVal = Float.valueOf(valueField.getText());
      } catch (Exception e)
      {
        return Float.valueOf(0f); // shouldn't happen
      }
      if (validator.getMin() != null && validator.getMax() != null)
      {
        float scaleMin = validator.getMin().floatValue()
                * sliderScaleFactor;
        float scaleMax = validator.getMax().floatValue()
                * sliderScaleFactor;
        slider.getModel().setRangeProperties(
                (int) (fVal * sliderScaleFactor), 1, (int) scaleMin,
                1 + (int) scaleMax, true);
      }
      else
      {
        slider.setVisible(false);
      }
      return new Float(fVal);
    }
  }

  /**
   * Constructor with the option to show 'compact' format (parameter description
   * as tooltip) or 'expanded' format (parameter description in a textbox which
   * may be opened or closed). Use compact for simple description text, expanded
   * for more wordy or formatted text.
   * 
   * @param paramContainer
   */
  public OptsAndParamsPage(OptsParametersContainerI paramContainer,
          boolean compact)
  {
    poparent = paramContainer;
    this.compact = compact;
  }

  public static void showUrlPopUp(JComponent invoker, final String finfo,
          int x, int y)
  {

    JPopupMenu mnu = new JPopupMenu();
    JMenuItem mitem = new JMenuItem(
            MessageManager.formatMessage("label.view_params", new String[]
            { finfo }));
    mitem.addActionListener(new ActionListener()
    {

      @Override
      public void actionPerformed(ActionEvent e)
      {
        Desktop.showUrl(finfo);

      }
    });
    mnu.add(mitem);
    mnu.show(invoker, x, y);
  }

  public Map<String, OptionBox> getOptSet()
  {
    return optSet;
  }

  public void setOptSet(Map<String, OptionBox> optSet)
  {
    this.optSet = optSet;
  }

  public Map<String, ParamBox> getParamSet()
  {
    return paramSet;
  }

  public void setParamSet(Map<String, ParamBox> paramSet)
  {
    this.paramSet = paramSet;
  }

  OptionBox addOption(OptionI opt)
  {
    OptionBox cb = optSet.get(opt.getName());
    if (cb == null)
    {
      cb = new OptionBox(opt);
      optSet.put(opt.getName(), cb);
      // jobOptions.add(cb, FlowLayout.LEFT);
    }
    return cb;
  }

  ParamBox addParameter(ParameterI arg)
  {
    ParamBox pb = paramSet.get(arg.getName());
    if (pb == null)
    {
      pb = new ParamBox(poparent, arg);
      paramSet.put(arg.getName(), pb);
      // paramList.add(pb);
    }
    pb.init();
    // take the defaults from the parameter
    pb.updateControls(arg);
    return pb;
  }

  void selectOption(OptionI option, String string)
  {
    OptionBox cb = optSet.get(option.getName());
    if (cb == null)
    {
      cb = addOption(option);
    }
    cb.enabled.setSelected(string != null); // initial state for an option.
    if (string != null)
    {
      if (option.getPossibleValues().contains(string))
      {
        cb.val.setSelectedItem(string);
      }
      else
      {
        throw new Error(String.format("Invalid value '%s' for option '%s'",
                string, option.getName()));
      }
    }
    if (option.isRequired() && !cb.enabled.isSelected())
    {
      // TODO: indicate paramset is not valid.. option needs to be selected!
    }
    cb.setInitialValue();
  }

  void setParameter(ParameterI arg)
  {
    ParamBox pb = paramSet.get(arg.getName());
    if (pb == null)
    {
      addParameter(arg);
    }
    else
    {
      pb.updateControls(arg);
    }

  }

  /**
   * recover options and parameters from GUI
   * 
   * @return
   */
  public List<ArgumentI> getCurrentSettings()
  {
    List<ArgumentI> argSet = new ArrayList<>();
    for (OptionBox opts : getOptSet().values())
    {
      OptionI opt = opts.getOptionIfEnabled();
      if (opt != null)
      {
        argSet.add(opt);
      }
    }
    for (ParamBox parambox : getParamSet().values())
    {
      ParameterI parm = parambox.getParameter();
      if (parm != null)
      {
        argSet.add(parm);
      }
    }

    return argSet;
  }
}