/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.properties.celleditors.value;

import java.awt.Component;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import javax.swing.AbstractCellEditor;
import javax.swing.JComboBox;
import javax.swing.JTable;

import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorChain;
import com.rapidminer.parameter.ParameterTypeInnerOperator;


/**
 * Parameter editor for {@link com.rapidminer.parameter.ParameterTypeInnerOperator}.
 * 
 * @author Ingo Mierswa
 */
public class InnerOperatorValueCellEditor extends AbstractCellEditor implements PropertyValueCellEditor {//, Observer<Operator> {

    private static final long serialVersionUID = -2559892872774108384L;

    private JComboBox operatorCombo = new JComboBox();

    private transient OperatorChain parentOperator;

    public InnerOperatorValueCellEditor(ParameterTypeInnerOperator type) {
    }
    
    public void setOperator(Operator parentOperator) {
        this.parentOperator = (OperatorChain)parentOperator;
        // We cannot add observers here. First, it hangs the GUI and second it is not guaranteed 
        // that it is removed again later. To be more precise, it is guaranteed that it is not removed.
        //this.parentOperator.addObserver(this, true);
        this.operatorCombo = new JComboBox();
        updateOperatorCombo();        
    }
        
    private void updateOperatorCombo() {
        Object selectedItem = this.operatorCombo.getSelectedItem();
        this.operatorCombo.removeAllItems();
        List<Operator> allInnerOps = parentOperator.getAllInnerOperators();
        Vector<String> allOpNames = new Vector<String>();
        Iterator<Operator> i = allInnerOps.iterator();
        while (i.hasNext())
            allOpNames.add(i.next().getName());
        Collections.sort(allOpNames);
        Iterator<String> s = allOpNames.iterator();
        while (s.hasNext()) {
            this.operatorCombo.addItem(s.next());
        }
        this.operatorCombo.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent e) {
                fireEditingStopped();
            }
        });
        if (this.operatorCombo.getItemCount() == 0)
            this.operatorCombo.addItem("add inner operators");
        this.operatorCombo.setSelectedItem(selectedItem);
    }

    public Object getCellEditorValue() {
        return operatorCombo.getSelectedItem();
    }

    public void setValue(String valueName) {
        if (valueName != null) {
            operatorCombo.setSelectedItem(valueName);
        } else {
            operatorCombo.setSelectedIndex(0);
        }
    }
    
    public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int col) {
        setValue((String) value);
        return operatorCombo;
    }

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        return getTableCellEditorComponent(table, value, isSelected, row, column);
    }
    
    public boolean useEditorAsRenderer() { return true; }

//	@Override
//	public void update(Observable<Operator> observable, Operator arg) {		
//		updateOperatorCombo();
//	}

	@Override
	public boolean rendersLabel() {
		return false;
	}
}