/**
 * 
 */
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.ListParameter;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.ObjectParameter;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;

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.SimpleContainer;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.event.SelectEvent;

/**
 * @author ceras
 *
 */
public class ListIntFld extends AbstractFld {

	private List<Item> items;
	private SimpleContainer simpleContainer;
	private VerticalLayoutContainer vp;
	private ListParameter listParameter;

	/**
	 * @param parameter
	 */
	public ListIntFld(Parameter parameter) {
		super(parameter);
		this.listParameter = (ListParameter) parameter;
		simpleContainer=new SimpleContainer();
		vp = new VerticalLayoutContainer();
		simpleContainer.add(vp);
		items = new ArrayList<Item>();
		addField(null);
	}

	private void addField(Item upperItem) {

		ObjectParameter objPar = new ObjectParameter(listParameter.getName(),
				listParameter.getDescription(), listParameter.getType(), null);

		if (upperItem == null) {
			Item item = new Item(objPar, 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(objPar, false);
			items.add(pos + 1, item);
			vp.insert(item, pos + 1);
		}

		simpleContainer.forceLayout();
	}

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

		vp.remove(item);
		
		if (items.size() == 1) {
			items.get(0).hideCancelButton();
		}
		
		simpleContainer.forceLayout();

	}

	/**
	 * 
	 */
	@Override
	public String getValue() {
		String separator = listParameter.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 simpleContainer;
	}

	/**
	 * 
	 */
	@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 IntFld field;
		private TextButton addButton;
		private TextButton removeButton;

		/**
		 * @param objPar
		 */
		public Item(ObjectParameter objectParameter, boolean first) {
			super();
			this.field = new IntFld(objectParameter);
			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 IntFld getField() {
			return field;
		}
	}

}