/**
    * This file Copyright (c) 2003-2012 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.admininterface;
  
  import info.magnolia.cms.beans.runtime.MultipartForm;
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.HierarchyManager;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.gui.dialog.Dialog;
  import info.magnolia.cms.gui.dialog.DialogControlImpl;
  import info.magnolia.cms.gui.dialog.DialogFactory;
  import info.magnolia.cms.gui.i18n.I18nAuthoringSupport;
  import info.magnolia.cms.gui.misc.Sources;
  import info.magnolia.cms.i18n.Messages;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.security.AccessDeniedException;
  import info.magnolia.cms.servlets.MVCServletHandlerImpl;
  import info.magnolia.cms.util.ExclusiveWrite;
  import info.magnolia.cms.util.NodeDataUtil;
  import info.magnolia.cms.util.RequestFormUtil;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.objectfactory.Classes;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.objectfactory.MgnlInstantiationException;
  import info.magnolia.repository.RepositoryConstants;
  
  import java.io.IOException;
  import java.io.PrintWriter;
  
  import javax.jcr.RepositoryException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpSession;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * This is the MVCHandler for dialogs. You can make a subclass to take influence on creation or saving.
   * @author Philipp Bracher
   * @version $Id$
   */
  
  public class DialogMVCHandler extends MVCServletHandlerImpl {
  
      /**
       * Logger.
       */
      private static Logger log = LoggerFactory.getLogger(DialogMVCHandler.class);
  
      /*
       * Commands
       */
      protected static final String COMMAND_SAVE = "save"; //$NON-NLS-1$
  
      protected static final String COMMAND_SELECT_PARAGRAPH = "selectParagraph"; //$NON-NLS-1$
  
      protected static final String COMMAND_SHOW_DIALOG = "showDialog"; //$NON-NLS-1$
  
      /*
       * Views
       */
      protected static final String VIEW_CLOSE_WINDOW = "close"; //$NON-NLS-1$
  
      protected static final String VIEW_SHOW_DIALOG = "show"; //$NON-NLS-1$
  
     /**
      * The posted multipart form. Use params for easy access.
      */
     protected MultipartForm form;
 
     /**
      * Path to the node containing the data
      */
     protected String path = StringUtils.EMPTY;
 
     /**
      * If the dialog serves a collection (multiple instances of the same dialog)
      */
     private String nodeCollectionName = StringUtils.EMPTY;
 
     /**
      * the node containing the date for this dialog
      */
     protected String nodeName = StringUtils.EMPTY;
 
     protected String richE = StringUtils.EMPTY;
 
     protected String richEPaste = StringUtils.EMPTY;
 
     protected String repository = StringUtils.EMPTY;
 
     protected String locale;
 
     protected HierarchyManager hm;
 
     private Dialog dialog;
 
     protected Messages msgs;
 
     protected RequestFormUtil params;
 
     protected Content storageNode;
 
     private SaveHandler saveHandler;
 
     private String jsExecutedAfterSaving;
 
     private String itemType;
 
     private final I18nAuthoringSupport i18nAuthoringSupport;
 
     /**
      * Initialize the used parameters: path, nodeCollectionName, nodeName, ..
      * @param request
      * @param response
      */
     public DialogMVCHandler(String name, HttpServletRequest request, HttpServletResponse response) {
         super(name, request, response);
 
         form = MgnlContext.getPostedForm();
         if(form != null || request != null){
             params = new RequestFormUtil(request, form);
 
             path = params.getParameter("mgnlPath"); //$NON-NLS-1$
             nodeCollectionName = params.getParameter("mgnlNodeCollection"); //$NON-NLS-1$
             nodeName = params.getParameter("mgnlNode"); //$NON-NLS-1$
             richE = params.getParameter("mgnlRichE"); //$NON-NLS-1$
             richEPaste = params.getParameter("mgnlRichEPaste"); //$NON-NLS-1$
             repository = params.getParameter("mgnlRepository", getRepository()); //$NON-NLS-1$
             locale = params.getParameter("mgnlLocale"); //$NON-NLS-1$
             if (StringUtils.isNotEmpty(repository)) {
                 hm = MgnlContext.getHierarchyManager(repository);
             }
         }
         msgs = MessagesManager.getMessages();
         // proxied. no need to refresh instance every time.
         i18nAuthoringSupport = I18nAuthoringSupport.Factory.getInstance();
 
     }
 
     /*
      * @see info.magnolia.cms.servlets.MVCServletHandler#getCommand()
      */
     @Override
     public String getCommand() {
         if (form != null) {
             return COMMAND_SAVE;
         }
         return COMMAND_SHOW_DIALOG;
     }
 
     /**
      * Calls createDialog and sets the common parameters on the dialog
      */
     public String showDialog() {
         return VIEW_SHOW_DIALOG;
     }
 
     protected void configureDialog(Dialog dialog) {
         dialog.setConfig("dialog", getName()); //$NON-NLS-1$
         dialog.setConfig("path", path); //$NON-NLS-1$
         dialog.setConfig("nodeCollection", nodeCollectionName); //$NON-NLS-1$
         dialog.setConfig("node", nodeName); //$NON-NLS-1$
         dialog.setConfig("richE", richE); //$NON-NLS-1$
         dialog.setConfig("richEPaste", richEPaste); //$NON-NLS-1$
         dialog.setConfig("repository", repository); //$NON-NLS-1$
         if (StringUtils.isNotEmpty(locale)) {
             dialog.setConfig("locale", locale);
         }
 
         i18nAuthoringSupport.i18nIze(dialog);
     }
 
     /**
      * Is called during showDialog(). Here can you create/ add controls for the dialog.
      * @param configNode
      * @param storageNode
      * @throws RepositoryException
      */
     protected Dialog createDialog(Content configNode, Content storageNode) throws RepositoryException {
         return DialogFactory.getDialogInstance(this.getRequest(), this.getResponse(), storageNode, configNode);
     }
 
     /**
      * Uses the SaveControl. Override to take influence.
      * todo - this should take care of exceptions thrown while writing
      * - onPreSave, Save and onPostSave should be allowed to throw an exception on failure
      * @return close view name
      */
     public String save() {
         if (!validate()) {
             return onValidationFailed();
         }
         SaveHandler saveHandler = getSaveHandler();
         if (!onPreSave(saveHandler)) {
             return onSaveFailed();
         }
         if (!onSave(saveHandler)) {
             return onSaveFailed();
         }
         synchronized (ExclusiveWrite.getInstance()) {
             if (!onPostSave(saveHandler)) {
                 return onSaveFailed();
             }
         }
         removeSessionAttributes();
         return VIEW_CLOSE_WINDOW;
     }
 
     private String onValidationFailed() {
         return showDialog();
     }
 
     protected boolean validate() {
         boolean passed = this.getDialog().validate();
 
         SaveHandler saveHandler = this.getSaveHandler();
         if ((passed) && (saveHandler instanceof ValidatingSaveHandler)) {
             passed = ((ValidatingSaveHandler) saveHandler).validate();
         }
 
         if (!passed) {
             // after failing validation on creation of the paragraph, the paragraph info would get lost
             if (StringUtils.isEmpty(this.dialog.getConfigValue("paragraph"))) {
                 // make sure paragraph name is set even after reloading the dialog due to failed validation
                 String paragraphName = params.getParameter("mgnlParagraph");
                 this.dialog.setConfig("paragraph", paragraphName);
             }
             if (StringUtils.isEmpty(this.dialog.getConfigValue("collectionNodeCreationItemType"))) {
                 this.dialog.setConfig("collectionNodeCreationItemType", params.getParameter("mgnlCollectionNodeCreationItemType"));
             }
             if (StringUtils.isEmpty(this.dialog.getConfigValue("creationItemType"))) {
                 this.dialog.setConfig("creationItemType", params.getParameter("mgnlCreationItemType"));
             }
         }
 
         return passed;
     }
 
     /**
      * Called if the save failed.
      */
     protected String onSaveFailed() {
         return showDialog();
     }
 
     /**
      * Returns the save handler used by this dialog handler.
      * @return the handler
      */
     protected SaveHandler getSaveHandler() {
         if (this.saveHandler == null) {
             createSaveHandler();
 
             configureSaveHandler(this.saveHandler);
         }
         return this.saveHandler;
     }
 
     /**
      * If there is the property saveHandler defined in the config it instantiates the configured save handler. Else it
      * instantiates the default save handler
      */
     protected void createSaveHandler() {
         Content configNode = this.getConfigNode();
         if (configNode != null) {
             String className = NodeDataUtil.getString(configNode, "saveHandler");
             if (StringUtils.isNotEmpty(className)) {
                 try {
                     this.saveHandler = Classes.newInstance(className);
                 }
                 catch (MgnlInstantiationException e) {
                     log.error("can't create save handler", e);
                 }
                 catch (ClassNotFoundException e) {
                     log.error("can't create save handler", e);
                 }
             }
         }
 
         if (this.saveHandler == null) {
             this.saveHandler = Components.getComponentProvider().newInstance(SaveHandler.class);
         }
     }
 
     /**
      * Configure the save control
      */
     protected void configureSaveHandler(SaveHandler saveHandler) {
         saveHandler.init(form);
 
         saveHandler.setPath(form.getParameter("mgnlPath")); //$NON-NLS-1$
         saveHandler.setNodeCollectionName(form.getParameter("mgnlNodeCollection")); //$NON-NLS-1$
         saveHandler.setNodeName(form.getParameter("mgnlNode")); //$NON-NLS-1$
         saveHandler.setParagraph(form.getParameter("mgnlParagraph")); //$NON-NLS-1$
         saveHandler.setRepository(form.getParameter("mgnlRepository")); //$NON-NLS-1$
         if (StringUtils.isNotEmpty(form.getParameter("mgnlCollectionNodeCreationItemType"))) {
             saveHandler.setCollectionNodeCreationItemType(new ItemType(form.getParameter("mgnlCollectionNodeCreationItemType")));
         }
         if (StringUtils.isNotEmpty(getItemType())) {
             saveHandler.setCreationItemType(new ItemType(getItemType()));
         } else if (StringUtils.isNotEmpty(form.getParameter("mgnlCreationItemType"))) {
             saveHandler.setCreationItemType(new ItemType(form.getParameter("mgnlCreationItemType")));
         }
 
         if (this.saveHandler instanceof DialogAwareSaveHandler) {
             ((DialogAwareSaveHandler) saveHandler).setDialog(this.getDialog());
         }
     }
 
     protected boolean onPreSave(SaveHandler control) {
         return true;
     }
 
     protected boolean onSave(SaveHandler control) {
         boolean result = control.save();
         if (result) {
             this.nodeName = control.getNodeName();
         }
         return result;
     }
 
     protected boolean onPostSave(SaveHandler control) {
         return true;
     }
 
     /**
      * Defines the node/page containing the data editing in this dialog. The default implementation is using the path
      * parameter
      */
     public Content getStorageNode() {
         // hm is null if this dialog is not used to show content
         if (storageNode == null && hm != null) {
             try {
                 if(this.path == null){
                     log.debug("No path defined for a dialog called by the url [{}]", this.getRequest().getRequestURL());
                     return null;
                 }
                 Content parentContent = hm.getContent(path);
                 if (StringUtils.isEmpty(nodeName)) {
                     if (StringUtils.isEmpty(nodeCollectionName)) {
                         storageNode = parentContent;
                     }
                     else {
                         storageNode = parentContent.getContent(nodeCollectionName);
                     }
                 }
                 else {
                     if (StringUtils.isEmpty(nodeCollectionName)) {
                         storageNode = parentContent.getContent(nodeName);
 
                     }
                     else {
                         storageNode = parentContent.getContent(nodeCollectionName).getContent(nodeName);
 
                     }
                 }
             }
             catch(AccessDeniedException ade){
                 log.error("can't read content to edit", ade);
             }
             catch (RepositoryException re) {
                 // content does not exist yet
                 log.debug("can't read content or it does not exist yet", re);
             }
         }
         return storageNode;
     }
 
     /**
      * Returns the node with the dialog definition. Default: null
      */
     public Content getConfigNode() {
         return null;
     }
 
     /**
      * @see info.magnolia.cms.servlets.MVCServletHandler#renderHtml(java.lang.String)
      */
     @Override
     public void renderHtml(String view) throws IOException {
         PrintWriter out = this.getResponse().getWriter();
 
         // after saving
         if (VIEW_CLOSE_WINDOW.equals(view)) {
 
             out.write("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" ");
             out.write(" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n");
             out.println("<html>"); //$NON-NLS-1$
             out.println(new Sources(this.getRequest().getContextPath()).getHtmlJs());
             out.println("<script type=\"text/javascript\">"); //$NON-NLS-1$
             out.println("var path = '" + this.path + "'");
             out.println(StringUtils.defaultIfEmpty(getJsExecutedAfterSaving(), "mgnlDialogReloadOpener();")); //$NON-NLS-1$
             out.println("window.close();"); //$NON-NLS-1$
             out.println("</script></html>"); //$NON-NLS-1$
         }
         // show the created dialog
         else if (VIEW_SHOW_DIALOG.equals(view)) {
             try {
                 getDialog().drawHtml(out);
             }
             catch (IOException e) {
                 log.error("Exception caught", e);
             }
         }
     }
 
     /**
      * @return the default repository
      */
     public String getRepository() {
         return RepositoryConstants.WEBSITE;
     }
 
     public void removeSessionAttributes() {
         String[] toRemove = form.getParameterValues(DialogControlImpl.SESSION_ATTRIBUTENAME_DIALOGOBJECT_REMOVE);
         if (toRemove != null) {
             for (int i = 0; i < toRemove.length; i++) {
                 HttpSession httpsession = this.getRequest().getSession(false);
                 if (httpsession != null) {
                     httpsession.removeAttribute(toRemove[i]);
                 }
             }
         }
     }
 
     /**
      * @param dialog The dialog to set.
      */
     public void setDialog(Dialog dialog) {
         this.dialog = dialog;
     }
 
     /**
      * @return Returns the dialog.
      */
     public Dialog getDialog() {
         if (this.dialog == null) {
             try {
                 this.dialog = createDialog(this.getConfigNode(), this.getStorageNode());
             }
             catch (RepositoryException e) {
                 log.error("can't create dialog", e);
             }
             configureDialog(this.dialog);
         }
         return this.dialog;
     }
 
 
     public String getJsExecutedAfterSaving() {
         return this.jsExecutedAfterSaving;
     }
 
 
     public void setJsExecutedAfterSaving(String jsExecutedAfterSaving) {
         this.jsExecutedAfterSaving = jsExecutedAfterSaving;
     }
 
 
     public String getItemType() {
         return this.itemType;
     }
 
 
     public void setItemType(String itemType) {
         this.itemType = itemType;
     }
 }