/*
 Wotonomy: OpenStep design patterns for pure Java applications.
 Copyright (C) 2000 Blacksmith, Inc.

 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, see http://www.gnu.org
 */

package net.wotonomy.web;

import java.util.Collection;
import java.util.Iterator;

import net.wotonomy.foundation.NSDictionary;

public class WORepetition extends WODynamicElement {

	protected int count;
	protected int index;
	protected Object item;
	protected Collection list;
	protected Iterator iterator;

	protected WORepetition() {
		super();
	}

	public WORepetition(String aName, NSDictionary aMap, WOElement template) {
		super(aName, aMap, template);
	}

	public void setCount(int value) {
		count = value;
	}

	public int count() {
		return count;
	}

	public void setIndex(int value) {
		index = value;
	}

	public int index() {
		return index;
	}

	public void setItem(Object value) {
		item = value;
	}

	public Object item() {
		return item;
	}

	public void setList(Collection value) {
		list = value;
	}

	public Collection list() {
		return list;
	}

	public void takeValuesFromRequest(WORequest r, WOContext c) {
		c.appendZeroElementIDComponent();
		pullValuesFromParent(c.component());
		index = 0;
		WOAssociation countAsoc = (WOAssociation) associations.objectForKey("count");
		item = getNextItem();
		while (item != null) {
			pushValuesToParent(c.component());
			rootElement.takeValuesFromRequest(r, c);
			index++;
			c.incrementLastElementIDComponent();
			if (countAsoc != null && index >= count())
				item = null;
			else
				item = getNextItem();
		}
		iterator = null;
		c.deleteLastElementIDComponent();
	}

	public WOActionResults invokeAction(WORequest r, WOContext c) {
		c.appendZeroElementIDComponent();
		pullValuesFromParent(c.component());
		index = 0;
		WOAssociation countAsoc = (WOAssociation) associations.objectForKey("count");
		item = getNextItem();
		while (item != null) {
			pushValuesToParent(c.component());
			WOActionResults e = rootElement.invokeAction(r, c);
			if (e != null) {
				iterator = null;
				return e;
			}
			index++;
			c.incrementLastElementIDComponent();
			if (countAsoc != null && index >= count())
				item = null;
			else
				item = getNextItem();
		}
		iterator = null;
		c.deleteLastElementIDComponent();
		return null;
	}

	public void appendToResponse(WOResponse r, WOContext c) {
		c.appendZeroElementIDComponent();
		pullValuesFromParent(c.component());
		index = 0;
		WOAssociation countAsoc = (WOAssociation) associations.objectForKey("count");
		item = getNextItem();
		while (item != null) {
			pushValuesToParent(c.component());
			rootElement.appendToResponse(r, c);
			index++;
			c.incrementLastElementIDComponent();
			if (countAsoc != null || index < count())
				item = null;
			else
				item = getNextItem();
		}
		iterator = null;
		c.deleteLastElementIDComponent();
	}

	protected Object getNextItem() {
		if (iterator == null) {
			if (list == null)
				return null;
			iterator = list.iterator();
		}
		if (iterator.hasNext()) {
			return iterator.next();
		}
		return null;
	}

	protected void pullValuesFromParent(WOComponent c) {
		Object value;

		value = valueForProperty("count", c);
		if (value instanceof Number) {
			setCount(((Number) value).intValue());
		} else {
			setCount(-1);
		}

		value = valueForProperty("list", c);
		if (value instanceof Collection) {
			setList((Collection) value);
		} else {
			setList(null);
		}
	}

	protected void pushValuesToParent(WOComponent c) {
		setValueForProperty("index", new Integer(index), c);
		setValueForProperty("item", item, c);
	}

}