package com.onaro.util.jfc.tables.filter;

import java.awt.EventQueue;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Set;
import java.util.TreeSet;

import javax.swing.JComboBox;
import javax.swing.table.TableModel;

import org.apache.commons.lang3.StringUtils;

import com.onaro.util.jfc.EnumJComboBox;
import com.onaro.util.jfc.tables.FilterTable;

/**
 * A filter editor displas a border-less popup window containig a text field in which the user types the search pattern.
 * The editor is closed whenever the table or the window changes or the mouse is clicked outside the editor.
 */
public class EnumComboBoxFilterEditor extends AbstractFilterEditor implements ActionListener{	
    /**
     * Installs a borderless pop up window on top a column's header and configures the listeners needed to close
     * this popup.
     */
    public EnumComboBoxFilterEditor(FilterTable filterTable, EnumFilter filter, int selectedColumnInModel) {
        super(filterTable, selectedColumnInModel, filter, new EnumJComboBox());
        Set<Object> nonEnumValuesInQuery = collectAllNonEnumValuesInQuery(selectedColumnInModel, filter.getAttributesSet());
        EnumJComboBox comboBox = ((EnumJComboBox) field);
        comboBox.setValues(filter.getAttributes(), nonEnumValuesInQuery, filter.getPattern());
        comboBox.addActionListener(this);
        comboBox.setEditable(false);
        comboBox.addPopupMenuListener(this);
    }


    protected Set<Object> collectAllNonEnumValuesInQuery(int selectedColumnInModel, Set<Object> attributes) {
        //the values should be sorted by their lexicographic order - which is the default
        Set<Object> set = new TreeSet<Object>();
        TableModel model = filterTable.getFilterModel().getEncapsulatedTableModel();
        int rows = model.getRowCount();
        for (int i = 0; i < rows; i++) {
            Object valueAt = model.getValueAt(i, selectedColumnInModel);

            //add only if value is not an enum (which are listed in the EnumFilter) or the same as the enum name
            if (valueAt != null && StringUtils.isNotBlank(valueAt.toString()) && !attributes.contains(valueAt) && !attributes.contains(valueAt.toString().toLowerCase())) {
                set.add(valueAt);
            }
        }
        return set;
    }

    public Object getPattern() {
        EnumJComboBox comboBox = ((EnumJComboBox) field);
        return comboBox.getSelectedValue();
    }

    protected void hideLater(AbstractFilterEditor filterEditor) {
    	@SuppressWarnings("unchecked")
        JComboBox<Object> comboBox = ((JComboBox<Object>) field);
    	comboBox.setPopupVisible(false);
        comboBox.removeActionListener(this);
    	super.hideLater(filterEditor);
    }

    public void show(Rectangle headerRect) {
        super.show(headerRect);

        //make sure that the combo box will be opened after the pop up is shown
        //if invoke later is not used, the setting will have no effect since is it still not shown
        final EnumJComboBox comboBox = ((EnumJComboBox) field);
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                comboBox.setPopupVisible(true);
            }
        });
    }

    /**
     * Invoked when an action occurs.<br>
     * There is an interesting behaviour that we want to achive in this class.
     * As a result of implementing Customer Case #3509 we introduce autocompletion.
     * If there are 2 or more options that share the same initial sequence of letters we want to 
     * highlight the first option matching user's input, but without closing the combo-box, this will allow the user to 
     * see the remaining options so he/she can continue typing and looking the next remaining matching options.
     * Once the user is satisfied with the selected item he/she will press ENTER key triggering the closing of the 
     * combo-box and the underline processing.
     *  
     */
	public void actionPerformed(ActionEvent e) {
    	if (e.getActionCommand().equals("comboBoxChanged")){ //$NON-NLS-1$
    		// Dismiss this event so the combo-box remains open until the user presses ENTER key
    		// or select the combo-box's item using a mouse-click-event.
    		return;
    	}
    	// Any other event proceeed closing the combo-box.
        close(true);
    }
}