/**
 * 
 */
package org.gcube.portlets.user.dataminermanager.client.form;

import java.util.ArrayList;
import java.util.List;

import org.gcube.portlets.user.dataminermanager.client.DataMinerManager;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.TabularListParameter;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.TabularParameter;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.widget.core.client.button.TextButton;
import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.event.SelectEvent;

/**
 * 
 * @author Giancarlo Panichi
 * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
 *
 */
public class TabularListFld extends AbstractFld {

	private List<Item> items = new ArrayList<Item>();
	private VerticalLayoutContainer vp;
	private TabularListParameter tabularListParameter;

	/**
	 * @param parameter
	 */
	public TabularListFld(Parameter parameter) {
		super(parameter);
		Log.debug("TabularListField");
		this.tabularListParameter = (TabularListParameter) parameter;
		vp = new VerticalLayoutContainer();
		addField(null);
	}

	private void addField(Item upperItem) {

		TabularParameter tabPar = new TabularParameter(
				tabularListParameter.getName(),
				tabularListParameter.getDescription(),null,
				tabularListParameter.getTemplates());

		if (upperItem == null) {
			Item item = new Item(tabPar, true);
			items.add(item);
			vp.add(item);
		} else {
			// search the position of the upper item
			int pos = 0;
			for (int i = 0; i < items.size(); i++)
				if (items.get(i) == upperItem) {
					pos = i;
					break;
				}

			upperItem.showCancelButton();
			Item item = new Item(tabPar, false);
			items.add(pos + 1, item);
			vp.insert(item, pos + 1);
		}

		vp.forceLayout();
	}

	/**
	 * @param item
	 */
	protected void removeField(Item item) {
		items.remove(item);

		vp.remove(item);
		vp.forceLayout();

		if (items.size() == 1) {
			items.get(0).hideCancelButton();
		}

	}

	/**
	 * 
	 */
	@Override
	public String getValue() {
		String separator = tabularListParameter.getSeparator();
		String value = "";
		boolean first = true;
		for (Item item : items) {
			String itemValue = item.getValue();
			if (itemValue != null && !itemValue.contentEquals("")) {
				value += (first ? "" : separator) + itemValue;
				first = false;
			}
		}
		return value;
	}

	/**
	 * 
	 */
	@Override
	public Widget getWidget() {
		return vp;
	}

	/**
	 * 
	 */
	@Override
	public boolean isValid() {
		boolean valid = false;
		for (Item item : items)
			if (item.getField().getValue() != null) {
				valid = true;
				break;
			}
		return valid;
	}

	private class Item extends HorizontalLayoutContainer {

		private TabularFld field;
		private TextButton addButton;
		
		private TextButton removeButton;
		
		
		/**
		 * 
		 * @param tabularParameter
		 * @param first
		 */
		public Item(TabularParameter tabularParameter, boolean first) {
			super();
			this.field = new TabularFld(tabularParameter);
			this.add(field.getWidget());
			
			addButton=  new TextButton("");
			addButton.setIcon(DataMinerManager.resources.add());
			addButton.addSelectHandler(new SelectEvent.SelectHandler() {
				
				@Override
				public void onSelect(SelectEvent event) {
					addField(Item.this);
				}
			});
							

			removeButton= new TextButton("");
			removeButton.setIcon(DataMinerManager.resources.cancel());

			removeButton.addSelectHandler(new SelectEvent.SelectHandler() {
				
				@Override
				public void onSelect(SelectEvent event) {
					removeField(Item.this);
				}
			});

			removeButton.setVisible(!first);

			this.add(addButton);
			this.add(removeButton);
		}

		public void showCancelButton() {
			removeButton.setVisible(true);
		}

		public void hideCancelButton() {
			removeButton.setVisible(false);
		}

		public String getValue() {
			return field.getValue();
		}

		public TabularFld getField() {
			return field;
		}
	}

}