/**
 * This file Copyright (c) 2003-2010 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package info.magnolia.module.workflow.pages;

import info.magnolia.cms.core.Content;
import info.magnolia.module.admininterface.TemplatedMVCHandler;
import info.magnolia.cms.core.HierarchyManager;
import info.magnolia.cms.security.Security;
import info.magnolia.cms.security.UserManager;
import info.magnolia.context.MgnlContext;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import javax.jcr.RepositoryException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.jdesktop.dom.SimpleDocument;
import org.jdesktop.dom.SimpleDocumentBuilder;
import org.jdesktop.dom.SimpleNodeList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 *
 */
public class WorkflowStatusPage extends TemplatedMVCHandler {

    /**
     *
     */
    private static final long serialVersionUID = 222L;

    /**
     * Logger
     */
    private static Logger log = LoggerFactory.getLogger(WorkflowStatusPage.class);

    /**
     * @param name
     * @param request
     * @param response
     */
    public WorkflowStatusPage(String name, HttpServletRequest request, HttpServletResponse response) {
        super(name, request, response);
    }

    public List getFlowList() throws RepositoryException {
        HierarchyManager hm = MgnlContext.getHierarchyManager("Expressions");
        if (!hm.getRoot().hasContent("owfe")) {
            return Collections.EMPTY_LIST;
        }
        List<FlowDescription> flowList = new ArrayList<FlowDescription>();
        Collection<Content> flows = hm.getContent("owfe").getChildren();
        for (Iterator<Content> iterator = flows.iterator(); iterator.hasNext();) {
            Content flow = iterator.next();
            Collection<Content> flowInst = flow.getChildren();
            FlowDescription descr = null;
            // ordering?
            for (Iterator<Content> iterator2 = flowInst.iterator(); iterator2.hasNext();) {
                Content instance = iterator2.next();
                int idx = instance.getName().indexOf('.');
                if (idx == -1) {
                    descr = new FlowDescription();
                    descr.setId(instance.getName());
                    descr.setFlowName(flow.getName());
                    flowList.add(descr);
                } else if (descr.getId().equals(instance.getName().substring(0, idx))) {
                    descr.setStep(descr.getStep() + 1);
                }
                Collection<Content> entries = instance.getChildren();
                for (Iterator<Content> iterator3 = entries.iterator(); iterator3.hasNext();) {
                    Content entry = iterator3.next();
                    if (entry.getName().endsWith("participant")) {
                        try {
                            SimpleDocument doc = SimpleDocumentBuilder.simpleParse(entry.getNodeData("value").getString());
                            Node participantNode = doc.getElement("/bean/field[@name='appliedWorkitem']/bean/field[@name='participantName']/primitive");
                            descr.setLastParticipant(participantNode == null ? null : participantNode.getTextContent());
                            SimpleNodeList attrs = doc.getElements("/bean/field[@name='appliedWorkitem']/bean/field[@name='attributes']/map/entry");
                            int len = attrs.getLength();
                            Method m = null;
                            for (int i = 0; i < len ; i++) {
                                Node beanAttrName = getFirstNonTextChild(attrs.item(i));
                                if (getNonTextSibling(beanAttrName) == null) {
                                    continue;
                                }
                                descr.addAttribute(getFirstNonTextChild(getFirstNonTextChild(beanAttrName)).getTextContent(), getFirstNonTextChild(getFirstNonTextChild(getNonTextSibling(beanAttrName))).getTextContent());
                            }
                            String lastMod = doc.getElement("/bean/field[@name='appliedWorkitem']/bean/field[@name='lastModified']/primitive").getTextContent();
                            descr.setLastModified(lastMod);
                        } catch (SAXException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    
                }
            }
        }
        return flowList;
    }

    /**
     * @param item
     * @return
     */
    private Node getFirstNonTextChild(Node item) {
        NodeList nodes = item.getChildNodes();
        int len = nodes.getLength();
        for (int i = 0; i < len; i++) {
            if (nodes.item(i).hasAttributes() || nodes.item(i).getLocalName() != null) {
                return nodes.item(i);
            }
        }
        return null;
    }

    /**
     * @param item
     * @return
     */
    private Node getNonTextSibling(Node item) {
        item = item.getNextSibling();
        while (item != null) {
            if (item.hasAttributes() || item.getLocalName() != null) {
                return item;
            }
            item = item.getNextSibling();
        };
        return item;
    }
    
    public String getUser(String userName) {
        if (userName == null) {
            return null;
        }
        UserManager man = Security.getUserManager();
        return man.getUser(userName).getProperty("title");
    }
}