/**
    * This file Copyright (c) 2003-2013 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.cms.gui.dialog;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.core.NodeData;
  import info.magnolia.cms.i18n.Messages;
  import info.magnolia.cms.i18n.MessagesManager;
  import info.magnolia.cms.i18n.MessagesUtil;
  import info.magnolia.cms.util.AlertUtil;
  import info.magnolia.cms.util.ContentUtil;
  import info.magnolia.cms.util.NodeDataUtil;
  import info.magnolia.cms.util.RequestFormUtil;
  import info.magnolia.util.EscapeUtil;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.Date;
  import java.util.Hashtable;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Pattern;
  
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.servlet.http.HttpSession;
  
  import org.apache.commons.lang.BooleanUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * @author Vinzenz Wyser
   * @version 2.0
   */
  public abstract class DialogControlImpl implements DialogControl {
  
      private static final String REQUIRED_PROPERTY = "required";
  
      public static final String VALIDATION_PATTERN_PROPERTY = "validationPattern";
  
      public static final String DEFAULT_VALUE_PROPERTY = "defaultValue";
  
      private static final String I18N_BASENAME_PROPERTY = "i18nBasename";
  
      public static final String SESSION_ATTRIBUTENAME_DIALOGOBJECT = "mgnlSessionAttribute"; //$NON-NLS-1$
  
      public static final String SESSION_ATTRIBUTENAME_DIALOGOBJECT_REMOVE = "mgnlSessionAttributeRemove"; //$NON-NLS-1$
  
      /**
       * Logger.
       */
      private static Logger log = LoggerFactory.getLogger(DialogControlImpl.class);
  
      /**
       * Current request.
       */
      private HttpServletRequest request;
  
     /**
      * Current response.
      */
     private HttpServletResponse response;
 
     /**
      * content data.
      */
     private Content storageNode;
 
     /**
      * config data.
      */
     private Map config = new Hashtable();
 
     /**
      * Sub controls.
      */
     private final List subs = new ArrayList();
 
     /**
      * options (radio, checkbox...).
      */
     private List options = new ArrayList();
 
     /**
      * The id is used to make the controls unic. Used by the javascripts. This is not a configurable value. See method
      * set and getName().
      */
     private String id = "mgnlControl"; //$NON-NLS-1$
 
     protected String value;
 
     /**
      * multiple values, e.g. checkbox.
      */
     private List values;
 
     private DialogControlImpl parent;
 
     private DialogControlImpl topParent;
 
     /**
      * Used if this control has its own message bundle defined or if this is the dialog object itself. Use getMessages
      * method to get the object for a control.
      */
     private Messages messages;
 
     /**
      */
     @Override
     public void init(HttpServletRequest request, HttpServletResponse response, Content storageNode, Content configNode)
         throws RepositoryException {
 
         if (log.isDebugEnabled()) {
             log.debug("Init " + getClass().getName()); //$NON-NLS-1$
         }
 
         this.storageNode = storageNode;
         this.request = request;
         this.response = response;
 
         this.initializeConfig(configNode);
     }
 
     /**
      * @see info.magnolia.cms.gui.dialog.DialogControl#drawHtml(Writer)
      */
     @Override
     public void drawHtml(Writer out) throws IOException {
         this.drawHtmlPreSubs(out);
         this.drawSubs(out);
         this.drawHtmlPostSubs(out);
     }
 
     public void addSub(Object o) {
         this.getSubs().add(o);
         if(o instanceof DialogControlImpl){
             ((DialogControlImpl)o).setParent(this);
         }
     }
 
     public void setConfig(String key, String value) {
         if (value != null) {
             this.config.put(key, value);
         }
     }
 
     public void setConfig(String key, boolean value) {
         this.config.put(key, BooleanUtils.toBooleanObject(value).toString());
     }
 
     public void setConfig(String key, int value) {
         this.config.put(key, Integer.toString(value));
     }
 
     public String getConfigValue(String key, String nullValue) {
         if (this.config.containsKey(key)) {
             return (String) this.config.get(key);
         }
 
         return nullValue;
     }
 
     public String getConfigValue(String key) {
         return this.getConfigValue(key, StringUtils.EMPTY);
     }
 
     public void setValue(String s) {
         this.value = s;
     }
 
     public String getValue() {
         if (this.value == null) {
             if (this.getStorageNode() != null) {
                 this.value = readValue();
                 if(this instanceof UUIDDialogControl){
                     String repository = ((UUIDDialogControl)this).getRepository();
                     this.value = ContentUtil.uuid2path(repository, this.value);
                 }
             }
             RequestFormUtil params = new RequestFormUtil(request);
             if (params.getParameter(this.getName()) != null) {
                 this.value = params.getParameter(this.getName());
             }
 
             if (this.value == null && StringUtils.isNotEmpty(getConfigValue(DEFAULT_VALUE_PROPERTY))) {
                 return this.getMessage(this.getConfigValue(DEFAULT_VALUE_PROPERTY));
             }
 
             if (this.value == null) {
                 this.value = StringUtils.EMPTY;
             }
         }
         return this.value;
     }
 
     protected String readValue() {
         try {
             if(!this.getStorageNode().hasNodeData(this.getName())){
                 return null;
             }
         }
         catch (RepositoryException e) {
             log.error("can't read nodedata [" + this.getName() + "]", e);
             return null;
         }
         return this.getStorageNode().getNodeData(this.getName()).getString();
     }
 
     public void setSaveInfo(boolean b) {
         this.setConfig("saveInfo", b); //$NON-NLS-1$
     }
 
     /**
      * Set the name of this control. This is not the same value as the id setted by the parent. In common this value is
      * setted in the dialog configuration.
      */
     public void setName(String s) {
         this.setConfig("name", s); //$NON-NLS-1$
     }
 
     /**
      * Return the configured name of this control (not the id).
      * @return the name
      */
     public String getName() {
         return EscapeUtil.escapeXss(this.getConfigValue("name")); //escape to prevent XSS attack
     }
 
     public void addOption(Object o) {
         this.getOptions().add(o);
     }
 
     public Content getStorageNode() {
         return this.storageNode;
     }
 
     public void setLabel(String s) {
         this.config.put("label", s); //$NON-NLS-1$
     }
 
     public void setDescription(String s) {
         this.config.put("description", s); //$NON-NLS-1$
     }
 
     public void removeSessionAttribute() {
         String name = this.getConfigValue(SESSION_ATTRIBUTENAME_DIALOGOBJECT);
         HttpServletRequest request = this.getRequest();
         if (request == null) {
             request = this.getTopParent().getRequest();
         }
         try {
             HttpSession httpsession = request.getSession(false);
             if (httpsession != null) {
                 httpsession.removeAttribute(name);
             }
         }
         catch (Exception e) {
             if (log.isDebugEnabled()) {
                 log.debug("removeSessionAttribute() for " + name + " failed because this.request is null"); //$NON-NLS-1$ //$NON-NLS-2$
             }
         }
     }
 
     public HttpServletRequest getRequest() {
         return this.request;
     }
 
     public void setOptions(List options) {
         this.options = options;
     }
 
     protected void drawHtmlPreSubs(Writer out) throws IOException {
         // do nothing
     }
 
     protected void drawSubs(Writer out) throws IOException {
         Iterator it = this.getSubs().iterator();
         int i = 0;
         while (it.hasNext()) {
             // use underscore (not divis)! could be used as js variable names
             String dsId = this.getId() + "_" + i; //$NON-NLS-1$
             DialogControlImpl ds = (DialogControlImpl) it.next();
             // set the parent in case not yet set. this is the case when custom code manipulates the subs list manually
             ds.setParent(this);
             ds.setId(dsId);
             ds.drawHtml(out);
             i++;
         }
     }
 
     protected void drawHtmlPostSubs(Writer out) throws IOException {
         // do nothing
     }
 
     public DialogControlImpl getParent() {
         return this.parent;
     }
 
     protected void setTopParent(DialogControlImpl top) {
         this.topParent = top;
     }
 
     public DialogControlImpl getTopParent() {
         DialogControlImpl topParent = this;
         if(this.topParent ==  null){
             while(topParent.getParent() != null){
                 topParent = topParent.getParent();
             }
             this.topParent = topParent;
         }
         return this.topParent;
     }
 
     public List getSubs() {
         return this.subs;
     }
 
     /**
      * Find a control by its name
      * @param name the name of the control to find
      * @return the found control or null
      */
     public DialogControlImpl getSub(String name) {
         DialogControlImpl found;
         for (Iterator iter = subs.iterator(); iter.hasNext();) {
             Object control = iter.next();
 
             // could be an implementation of DialogControl only
             if (control instanceof DialogControlImpl) {
                 if (StringUtils.equals(((DialogControlImpl) control).getName(), name)) {
                     return (DialogControlImpl) control;
                 }
                 found = ((DialogControlImpl) control).getSub(name);
                 if (found != null) {
                     return found;
                 }
             }
         }
         return null;
     }
 
     protected HttpServletResponse getResponse() {
         return this.response;
     }
 
     /**
      * @deprecated websitenode should only be set in init(), this is a workaround used in DialogDate
      */
     protected void clearWebsiteNode() {
         this.storageNode = null;
     }
 
     public String getId() {
         return this.id;
     }
 
     public String getLabel() {
         return this.getConfigValue("label", StringUtils.EMPTY); //$NON-NLS-1$
     }
 
     public String getDescription() {
         return this.getConfigValue("description", StringUtils.EMPTY); //$NON-NLS-1$
     }
 
     public List getOptions() {
         return this.options;
     }
 
     public List getValues() {
         if (this.values == null) {
             this.values = readValues();
 
             if(this instanceof UUIDDialogControl){
                 String repository = ((UUIDDialogControl)this).getRepository();
                 List pathes = new ArrayList();
                 for (Iterator iter = this.values.iterator(); iter.hasNext();) {
                     String uuid = (String) iter.next();
                     String path = ContentUtil.uuid2path(repository, uuid);
                     pathes.add(path);
                 }
                 this.values = pathes;
             }
 
             if (request != null) {
                 RequestFormUtil params = new RequestFormUtil(request);
                 String[] values = params.getParameterValues(this.getName());
                 if (values != null && values.length > 0) {
                     this.values.clear();
                     for (int i = 0; i < values.length; i++) {
                         String value = values[i];
                         this.values.add(value);
                     }
                 }
             }
         }
 
         return this.values;
     }
 
     protected List readValues() {
         List values = new ArrayList();
         if (this.getStorageNode() != null) {
             try {
                 NodeData node = this.getStorageNode().getNodeData(this.getName());
                 if(node.isMultiValue() == NodeData.MULTIVALUE_TRUE) {
                     values = NodeDataUtil.getValuesStringList(node.getValues());
                 } else {
                     Collection<NodeData> nodeDataCollection = this.getStorageNode().getContent(this.getName()).getNodeDataCollection();
                     List<NodeData> nodeDatas = new ArrayList<NodeData>(nodeDataCollection);
                     Collections.sort(nodeDatas, new Comparator<NodeData> () {
                         @Override
                         public int compare(NodeData o1, NodeData o2) {
                           return o1.getName().compareTo(o2.getName());
                         }
                     });
                     Iterator<NodeData> it = nodeDatas.iterator();
                     while (it.hasNext()) {
                         NodeData data = it.next();
                         values.add(data.getString());
                     }
                 }
             }
             catch (PathNotFoundException e) {
                 // not yet existing: OK
             }
             catch (RepositoryException re) {
                 log.error("can't set values", re);
             }
         }
         return values;
     }
 
     /**
      * This method sets a control into the session
      */
     public void setSessionAttribute() {
         String name = SESSION_ATTRIBUTENAME_DIALOGOBJECT + "_" + this.getName() + "_" + new Date().getTime(); //$NON-NLS-1$ //$NON-NLS-2$
         this.setConfig(SESSION_ATTRIBUTENAME_DIALOGOBJECT, name);
         HttpServletRequest request = this.getRequest();
         if (request == null) {
             request = this.getTopParent().getRequest();
         }
         try {
 
             // @todo IMPORTANT remove use of http session
             HttpSession httpsession = request.getSession(true);
             httpsession.setAttribute(name, this);
         }
         catch (Exception e) {
             log.error("setSessionAttribute() for " + name + " failed because this.request is null"); //$NON-NLS-1$ //$NON-NLS-2$
         }
     }
 
     private void setId(String id) {
         this.id = id;
     }
 
     private void initializeConfig(Content configNodeParent) throws RepositoryException {
 
         // create config and subs out of dialog structure
         Map config = new Hashtable();
 
         if (configNodeParent == null) {
             // can happen only if Dialog is instantiated directly
             return;
         }
 
         // get properties -> to this.config
         Iterator itProps = configNodeParent.getNodeDataCollection().iterator();
         while (itProps.hasNext()) {
             NodeData data = (NodeData) itProps.next();
             String name = data.getName();
             String value = data.getString();
             config.put(name, value);
         }
 
         config.put("handle", configNodeParent.getHandle());
 
         // name is usually mandatory, use node name if a name property is not set
         if (!config.containsKey("name")) {
             config.put("name", configNodeParent.getName());
         }
 
         this.config = config;
 
         Iterator it = configNodeParent.getChildren(ItemType.CONTENTNODE).iterator();
         while (it.hasNext()) {
             Content configNode = (Content) it.next();
 
             // allow references
             while(configNode.hasNodeData("reference")){
                 configNode = configNode.getNodeData("reference").getReferencedContent();
             }
 
             String controlType = configNode.getNodeData("controlType").getString(); //$NON-NLS-1$
 
             if (StringUtils.isEmpty(controlType)) {
                 String name = configNode.getName();
                 if (!name.startsWith("options")) { //$NON-NLS-1$
                     log.debug("Missing control type for configNode " + name); //$NON-NLS-1$
                 }
                 continue;
             }
 
             if (log.isDebugEnabled()) {
                 log.debug("Loading control \"" + controlType + "\" for " + configNode.getHandle()); //$NON-NLS-1$ //$NON-NLS-2$
             }
             DialogControl dialogControl = DialogFactory
                 .loadDialog(request, response, this.getStorageNode(), configNode);
             this.addSub(dialogControl);
         }
     }
 
     private void setParent(DialogControlImpl parent) {
         this.parent = parent;
     }
 
     /**
      * Get the AbstractMessagesImpl object for this dialog/control. It checks first if there was a bundle defined
      * <code>i18nBasename</code>, then it tries to find the parent with the first definition.
      * @return
      */
     protected Messages getMessages() {
         if (messages == null) {
             // if this is the root
             if (this.getParent() == null) {
                 messages = MessagesManager.getMessages();
             }
             else {
                 // try to get it from the control nearest to the root
                 messages = this.getParent().getMessages();
             }
             // if this control defines a bundle (basename in the terms of jstl)
             String basename = this.getConfigValue(I18N_BASENAME_PROPERTY);
             if (StringUtils.isNotEmpty(basename)) {
                 // extend the chain with this bundle
                 messages = MessagesUtil.chain(basename, messages);
             }
         }
         return messages;
     }
 
     /**
      * Get the message.
      * @param key key
      * @return message
      */
     public String getMessage(String key) {
         return this.getMessages().getWithDefault(key, key);
     }
 
     /**
      * Get the message with replacement strings. Use the {nr} syntax
      * @param key key
      * @param args replacement strings
      * @return message
      */
     public String getMessage(String key, Object[] args) {
         return this.getMessages().getWithDefault(key, args, key);
     }
 
     /**
      * If the validation fails the code will set a message in the context using the AlertUtil.
      * @return true if valid
      */
     public boolean validate() {
 
         if (this.isRequired()) {
             boolean valueFound = false;
             for (Iterator iter = this.getValues().iterator(); iter.hasNext();) {
                 String value = (String) iter.next();
                 if(!StringUtils.isEmpty(value)){
                     valueFound = true;
                     break;
                 }
             }
             if (!valueFound && StringUtils.isEmpty(this.getValue())) {
                 setValidationMessage("dialogs.validation.required");
                 return false;
             }
         }
         if(StringUtils.isNotEmpty(getValidationPattern()) && StringUtils.isNotEmpty(this.getValue())){
             if(!Pattern.matches(getValidationPattern(), this.getValue())){
                 setValidationMessage("dialogs.validation.invalid");
                 return false;
             }
         }
         for (Iterator iter = this.getSubs().iterator(); iter.hasNext();) {
             DialogControl sub = (DialogControl) iter.next();
             if (sub instanceof DialogControlImpl) {
                 DialogControlImpl subImpl = (DialogControlImpl) sub;
                 subImpl.setParent(this);
                 if (!subImpl.validate()) {
                     return false;
                 }
             }
 
         }
         return true;
     }
 
     protected void setValidationMessage(String msg) {
         String name = this.getMessage(this.getLabel());
         String tabName = "";
         if (this.getParent() instanceof DialogTab) {
             DialogTab tab = (DialogTab) this.getParent();
             tabName = tab.getMessage(tab.getLabel());
         }
         AlertUtil.setMessage(this.getMessage(msg, new Object[]{name, tabName, this.getValue()}));
     }
 
     public String getValidationPattern() {
         return this.getConfigValue(VALIDATION_PATTERN_PROPERTY);
     }
 
     /**
      * True if a value is required. Set it in the configuration
      * @return
      */
     public boolean isRequired() {
         if (BooleanUtils.toBoolean(this.getConfigValue(REQUIRED_PROPERTY))) {
             return true;
         }
         return false;
     }
 
     public void setRequired(boolean required) {
         this.setConfig(REQUIRED_PROPERTY, BooleanUtils.toStringTrueFalse(required));
     }
 
     /**
      * @deprecated use getStorageNode()
      */
     public Content getWebsiteNode() {
         return getStorageNode();
     }
 
 }