/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.help.internal.webapp.data;

import java.io.*;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

import org.eclipse.help.internal.webapp.servlet.*;
import org.eclipse.help.internal.workingset.*;

/**
 * This class manages help working sets
 */
public class WorkingSetManagerData extends RequestData {
	private final static int NONE = 0;
	private final static int ADD = 1;
	private final static int REMOVE = 2;
	private final static int EDIT = 3;

	private String name;
	private WebappWorkingSetManager wsmgr;
	// Indicates whether operation specified in the request failed
	private boolean saved = true;

	public WorkingSetManagerData(ServletContext context,
			HttpServletRequest request, HttpServletResponse response) {
		super(context, request, response);
		wsmgr = new WebappWorkingSetManager(request, response, getLocale());
		name = request.getParameter("workingSet"); //$NON-NLS-1$
		try {
			switch (getOperation()) {
				case ADD :
					addWorkingSet();
					break;
				case REMOVE :
					removeWorkingSet();
					break;
				case EDIT :
					editWorkingSet();
					break;
				default :
					break;
			}
		} catch (IOException ioe) {
			saved = false;
		}
	}

	public void addWorkingSet() throws IOException {
		if (name != null && name.length() > 0) {

			String[] hrefs = request.getParameterValues("hrefs"); //$NON-NLS-1$
			if (hrefs == null)
				hrefs = new String[0];

			ArrayList selectedElements = new ArrayList(hrefs.length);
			for (int i = 0; i < hrefs.length; i++) {
				AdaptableHelpResource res = getAdaptableHelpResource(hrefs[i]);
				if (res != null)
					selectedElements.add(res);
			}

			AdaptableHelpResource[] elements = new AdaptableHelpResource[selectedElements
					.size()];
			selectedElements.toArray(elements);
			WorkingSet ws = wsmgr.createWorkingSet(name, elements);
			wsmgr.addWorkingSet(ws);
		}
	}

	public void removeWorkingSet() {
		if (name != null && name.length() > 0) {

			WorkingSet ws = wsmgr.getWorkingSet(name);
			if (ws != null)
				wsmgr.removeWorkingSet(ws);
		}
	}

	public void editWorkingSet() throws IOException {
		if (name != null && name.length() > 0) {

			String oldName = request.getParameter("oldName"); //$NON-NLS-1$
			if (oldName == null || oldName.length() == 0)
				oldName = name;
			WorkingSet ws = wsmgr.getWorkingSet(oldName);
			if (ws != null) {
				String[] hrefs = request.getParameterValues("hrefs"); //$NON-NLS-1$
				if (hrefs == null)
					hrefs = new String[0];

				ArrayList selectedElements = new ArrayList(hrefs.length);
				for (int i = 0; i < hrefs.length; i++) {
					AdaptableHelpResource res = getAdaptableHelpResource(hrefs[i]);
					if (res != null)
						selectedElements.add(res);
				}

				AdaptableHelpResource[] elements = new AdaptableHelpResource[selectedElements
						.size()];
				selectedElements.toArray(elements);

				ws.setElements(elements);
				ws.setName(name);
				// should also change the name....

				// We send this notification, so that the manager fires to its
				// listeners
				wsmgr.workingSetChanged(ws);
			}
		}
	}

	public String[] getWorkingSets() {
		WorkingSet[] workingSets = wsmgr.getWorkingSets();
		String[] sets = new String[workingSets.length];
		for (int i = 0; i < workingSets.length; i++)
			sets[i] = workingSets[i].getName();

		return sets;
	}

	public String getWorkingSetName() {
		if (name == null || name.length() == 0) {
			// See if anything is set in the preferences
			name = wsmgr.getCurrentWorkingSet();
			if (name == null || name.length() == 0
					|| wsmgr.getWorkingSet(name) == null)
				name = ServletResources.getString("All", request); //$NON-NLS-1$
		}
		return name;
	}

	public WorkingSet getWorkingSet() {
		if (name != null && name.length() > 0)
			return wsmgr.getWorkingSet(name);
		return null;
	}

	public boolean isCurrentWorkingSet(int i) {
		WorkingSet[] workingSets = wsmgr.getWorkingSets();
		return workingSets[i].getName().equals(name);
	}

	private int getOperation() {
		String op = request.getParameter("operation"); //$NON-NLS-1$
		if ("add".equals(op)) //$NON-NLS-1$
			return ADD;
		else if ("remove".equals(op)) //$NON-NLS-1$
			return REMOVE;
		else if ("edit".equals(op)) //$NON-NLS-1$
			return EDIT;
		else
			return NONE;
	}

	private AdaptableHelpResource getAdaptableHelpResource(String internalId) {
		AdaptableHelpResource res = wsmgr.getAdaptableToc(internalId);
		if (res == null)
			res = wsmgr.getAdaptableTopic(internalId);
		return res;
	}
	/**
	 * @return null or error message if saving saved
	 */
	public String getSaveError() {
		if (saved) {
			return null;
		}
		return UrlUtil.JavaScriptEncode(ServletResources.getString(
				"cookieSaveFailed", request)); //$NON-NLS-1$
	}
}