/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.krad.uif.util;
  
  import org.apache.commons.lang.ArrayUtils;
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.uif.component.Component;
  import org.kuali.rice.krad.uif.element.Message;
  import org.kuali.rice.krad.uif.lifecycle.ViewLifecycle;
  import org.kuali.rice.krad.uif.lifecycle.ViewPostMetadata;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.util.KRADConstants;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  /**
   * Rich message structure utilities for parsing message content and converting it to components/content
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class MessageStructureUtils {
  
      /**
       * Translate a message with special hooks described in MessageStructureUtils.parseMessage.  However, tags which
       * reference components will not be allowed/translated - only tags which can translate to string content will
       * be included for this translation.
       *
       * @param messageText messageText with only String translateable tags included (no id or component index tags)
       * @return html translation of rich messageText passed in
       * @see MessageStructureUtils#parseMessage
       */
      public static String translateStringMessage(String messageText) {
          if (!StringUtils.isEmpty(messageText)) {
              List<Component> components = MessageStructureUtils.parseMessage(null, messageText, null, null, false);
  
              if (!components.isEmpty()) {
                  Component message = components.get(0);
  
                  if (message instanceof Message) {
                      messageText = ((Message) message).getMessageText();
                  }
              }
          }
  
          return messageText;
      }
  
      /**
       * Parses the message text passed in and returns the resulting rich message component structure.
       *
       * <p>If special characters [] are detected the message is split at that location.  The types of features supported
       * by the parse are (note that &lt;&gt; are not part of the content, they specify placeholders):
       * <ul>
       * <li>[id=&lt;component id&gt;] - insert component with id specified at that location in the message</li>
       * <li>[n] - insert component at index n from the inlineComponent list</li>
       * <li>[&lt;html tag&gt;][/&lt;html tag&gt;] - insert html content directly into the message content at that
       * location,
       * without the need to escape the &lt;&gt; characters in xml</li>
       * <li>[color=&lt;html color code/name&gt;][/color] - wrap content in color tags to make text that color
       * in the message</li>
       * <li>[css=&lt;css classes&gt;][/css] - apply css classes specified to the wrapped content - same as wrapping
       * the content in span with class property set</li>
       * <li>[link=&lt;href src&gt;][/link] - an easier way to create an anchor that will open in a new page to the
       * href specified after =</li>
       * <li>[action=&lt;href src&gt;][/action] - create an action link inline without having to specify a component by
       * id or index.  The options for this are as follows and MUST be in a comma seperated list in the order specified
       * (specify 1-4 always in this order):
       * <ul>
       * <li>methodToCall(String)</li>
       * <li>validateClientSide(boolean) - true if not set</li>
       * <li>ajaxSubmit(boolean) - true if not set</li>
       * <li>successCallback(js function or function declaration) - this only works when ajaxSubmit is true</li>
       * </ul>
       * The tag would look something like this [action=methodToCall]Action[/action] in most common cases.  And in more
       * complex cases [action=methodToCall,true,true,functionName]Action[/action].  <p>In addition to these settings,
       * you can also specify data to send to the server in this fashion (space is required between settings and data):
       * </p>
       * [action=&lt;action settings&gt; data={key1: 'value 1', key2: value2}]
       * </li>
       * </ul>
       * If the [] characters are needed in message text, they need to be declared with an escape character: \\[ \\]
       * </p>
       *
       * @param messageId id of the message
      * @param messageText message text to be parsed
      * @param componentList the inlineComponent list
      * @param view the current view
      * @param parseComponents true to parse components
      * @return list of components representing the parsed message structure
      */
     public static List<Component> parseMessage(String messageId, String messageText, List<Component> componentList,
             View view, boolean parseComponents) {
         messageText = messageText.replace("\\" + KRADConstants.MessageParsing.LEFT_TOKEN,
                 KRADConstants.MessageParsing.LEFT_BRACKET);
         messageText = messageText.replace("\\" + KRADConstants.MessageParsing.RIGHT_TOKEN,
                 KRADConstants.MessageParsing.RIGHT_BRACKET);
         messageText = messageText.replace(KRADConstants.MessageParsing.RIGHT_TOKEN,
                 KRADConstants.MessageParsing.RIGHT_TOKEN_PLACEHOLDER);
         String[] messagePieces = messageText.split("[\\" + KRADConstants.MessageParsing.LEFT_TOKEN +
                 "|\\" + KRADConstants.MessageParsing.RIGHT_TOKEN + "]");
 
         List<Component> messageComponentStructure = new ArrayList<Component>();
 
         //current message object to concatenate to after it is generated to prevent whitespace issues and
         //creation of multiple unneeded objects
         Message currentMessageComponent = null;
 
         for (String messagePiece : messagePieces) {
             if (messagePiece.endsWith(KRADConstants.MessageParsing.RIGHT_TOKEN_MARKER)) {
                 messagePiece = StringUtils.removeEnd(messagePiece, KRADConstants.MessageParsing.RIGHT_TOKEN_MARKER);
 
                 if (StringUtils.startsWithIgnoreCase(messagePiece, KRADConstants.MessageParsing.COMPONENT_BY_ID + "=")
                         && parseComponents) {
                     //Component by Id
                     currentMessageComponent = processIdComponentContent(messagePiece, messageComponentStructure,
                             currentMessageComponent, view);
                 } else if (messagePiece.matches("^[0-9]+( .+=.+)*$") && parseComponents) {
                     //Component by index of inlineComponents
                     currentMessageComponent = processIndexComponentContent(messagePiece, componentList,
                             messageComponentStructure, currentMessageComponent, view, messageId);
                 } else if (StringUtils.startsWithIgnoreCase(messagePiece, KRADConstants.MessageParsing.COLOR + "=")
                         || StringUtils.startsWithIgnoreCase(messagePiece, "/" + KRADConstants.MessageParsing.COLOR)) {
                     //Color span
                     currentMessageComponent = processColorContent(messagePiece, currentMessageComponent, view);
                 } else if (StringUtils.startsWithIgnoreCase(messagePiece,
                         KRADConstants.MessageParsing.CSS_CLASSES + "=") || StringUtils.startsWithIgnoreCase(
                         messagePiece, "/" + KRADConstants.MessageParsing.CSS_CLASSES)) {
                     //css class span
                     currentMessageComponent = processCssClassContent(messagePiece, currentMessageComponent, view);
                 } else if (StringUtils.startsWithIgnoreCase(messagePiece, KRADConstants.MessageParsing.LINK + "=")
                         || StringUtils.startsWithIgnoreCase(messagePiece, "/" + KRADConstants.MessageParsing.LINK)) {
                     //link (a tag)
                     currentMessageComponent = processLinkContent(messagePiece, currentMessageComponent, view);
                 } else if (StringUtils.startsWithIgnoreCase(messagePiece,
                         KRADConstants.MessageParsing.ACTION_LINK + "=") || StringUtils.startsWithIgnoreCase(
                         messagePiece, "/" + KRADConstants.MessageParsing.ACTION_LINK)) {
                     //action link (a tag)
                     currentMessageComponent = processActionLinkContent(messagePiece, currentMessageComponent, view);
                 } else if (messagePiece.equals("")) {
                     //do nothing    
                 } else {
                     //raw html content
                     currentMessageComponent = processHtmlContent(messagePiece, currentMessageComponent, view);
                 }
             } else {
                 //raw string
                 messagePiece = addBlanks(messagePiece);
                 currentMessageComponent = concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
             }
         }
 
         if (currentMessageComponent != null && StringUtils.isNotEmpty(currentMessageComponent.getMessageText())) {
             messageComponentStructure.add(currentMessageComponent);
             currentMessageComponent = null;
         }
 
         return messageComponentStructure;
     }
 
     /**
      * Concatenates string content onto the message passed in and passes it back.  If the message is null, creates
      * a new message object with the string content and passes that back.
      *
      * @param currentMessageComponent Message object
      * @param messagePiece string content to be concatenated
      * @param view the current view
      * @return resulting concatenated Message
      */
     private static Message concatenateStringMessageContent(Message currentMessageComponent, String messagePiece,
             View view) {
         if (currentMessageComponent == null) {
             currentMessageComponent = ComponentFactory.getMessage();
             currentMessageComponent.setMessageText(messagePiece);
             currentMessageComponent.setRenderWrapperTag(false);
         } else {
             currentMessageComponent.setMessageText(currentMessageComponent.getMessageText() + messagePiece);
         }
 
         return currentMessageComponent;
     }
 
     /**
      * Process the additional properties beyond index 0 of the tag (that was split into parts).
      *
      * <p>This will evaluate and set each of properties on the component passed in.  This only allows
      * setting of properties that can easily be converted to/from/are String type by Spring.</p>
      *
      * @param component component to have its properties set
      * @param tagParts the tag split into parts, index 0 is ignored
      * @return component with its properties set found in the tag's parts
      */
     private static Component processAdditionalProperties(Component component, String[] tagParts) {
         String componentString = tagParts[0];
         tagParts = (String[]) ArrayUtils.remove(tagParts, 0);
 
         for (String part : tagParts) {
             String[] propertyValue = part.split("=");
 
             if (propertyValue.length == 2) {
                 String path = propertyValue[0];
                 String value = propertyValue[1].trim();
                 value = StringUtils.removeStart(value, "'");
                 value = StringUtils.removeEnd(value, "'");
                 ObjectPropertyUtils.setPropertyValue(component, path, value);
             } else {
                 throw new RuntimeException(
                         "Invalid Message structure for component defined as " + componentString + " around " + part);
             }
         }
 
         return component;
     }
 
     /**
      * Inserts &amp;nbsp; into the string passed in, if spaces exist at the beginning and/or end,
      * so spacing is not lost in html translation.
      *
      * @param text string to insert  &amp;nbsp;
      * @return String with  &amp;nbsp; inserted, if applicable
      */
     public static String addBlanks(String text) {
         if (StringUtils.startsWithIgnoreCase(text, " ")) {
             text = "&nbsp;" + StringUtils.removeStart(text, " ");
         }
 
         if (text.endsWith(" ")) {
             text = StringUtils.removeEnd(text, " ") + "&nbsp;";
         }
 
         return text;
     }
 
     /**
      * Process a piece of the message that has id content to get a component by id and insert it in the structure
      *
      * @param messagePiece String piece with component by id content
      * @param messageComponentStructure the structure of the message being built
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return null if currentMessageComponent had a value (it is now added to the messageComponentStructure passed in)
      */
     private static Message processIdComponentContent(String messagePiece, List<Component> messageComponentStructure,
             Message currentMessageComponent, View view) {
         //splits around spaces not included in single quotes
         String[] parts = messagePiece.trim().trim().split("([ ]+(?=([^']*'[^']*')*[^']*$))");
         messagePiece = parts[0];
 
         //if there is a currentMessageComponent add it to the structure and reset it to null
         //because component content is now interrupting the string content
         if (currentMessageComponent != null && StringUtils.isNotEmpty(currentMessageComponent.getMessageText())) {
             messageComponentStructure.add(currentMessageComponent);
             currentMessageComponent = null;
         }
 
         //match component by id from the view
         messagePiece = StringUtils.remove(messagePiece, "'");
         messagePiece = StringUtils.remove(messagePiece, "\"");
         Component component = ComponentFactory.getNewComponentInstance(StringUtils.removeStart(messagePiece,
                 KRADConstants.MessageParsing.COMPONENT_BY_ID + "="));
 
         if (component != null) {
             component.addStyleClass(KRADConstants.MessageParsing.INLINE_COMP_CLASS);
 
             if (parts.length > 1) {
                 component = processAdditionalProperties(component, parts);
             }
             messageComponentStructure.add(component);
         }
 
         return currentMessageComponent;
     }
 
     /**
      * Process a piece of the message that has index content to get a component by index in the componentList passed in
      * and insert it in the structure
      *
      * @param messagePiece String piece with component by index content
      * @param componentList list that contains the component referenced by index
      * @param messageComponentStructure the structure of the message being built
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @param messageId id of the message being parsed (for exception notification)
      * @return null if currentMessageComponent had a value (it is now added to the messageComponentStructure passed in)
      */
     private static Message processIndexComponentContent(String messagePiece, List<Component> componentList,
             List<Component> messageComponentStructure, Message currentMessageComponent, View view, String messageId) {
         //splits around spaces not included in single quotes
         String[] parts = messagePiece.trim().trim().split("([ ]+(?=([^']*'[^']*')*[^']*$))");
         messagePiece = parts[0];
 
         //if there is a currentMessageComponent add it to the structure and reset it to null
         //because component content is now interrupting the string content
         if (currentMessageComponent != null && StringUtils.isNotEmpty(currentMessageComponent.getMessageText())) {
             messageComponentStructure.add(currentMessageComponent);
             currentMessageComponent = null;
         }
 
         //match component by index from the componentList passed in
         int cIndex = Integer.parseInt(messagePiece);
 
         if (componentList != null && cIndex < componentList.size() && !componentList.isEmpty()) {
             Component component = componentList.get(cIndex);
 
             if (component != null) {
                 if (parts.length > 1) {
                     component = processAdditionalProperties(component, parts);
                 }
 
                 component.addStyleClass(KRADConstants.MessageParsing.INLINE_COMP_CLASS);
                 messageComponentStructure.add(component);
             }
         } else {
             throw new RuntimeException("Component with index " + cIndex +
                     " does not exist in inlineComponents of the message component with id " + messageId);
         }
 
         return currentMessageComponent;
     }
 
     /**
      * Process a piece of the message that has color content by creating a span with that color style set
      *
      * @param messagePiece String piece with color content
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return currentMessageComponent with the new textual content generated by this method appended to its
      *         messageText
      */
     private static Message processColorContent(String messagePiece, Message currentMessageComponent, View view) {
         if (!StringUtils.startsWithIgnoreCase(messagePiece, "/")) {
             messagePiece = StringUtils.remove(messagePiece, "'");
             messagePiece = StringUtils.remove(messagePiece, "\"");
             messagePiece = "<span style='color: " + StringUtils.removeStart(messagePiece,
                     KRADConstants.MessageParsing.COLOR + "=") + ";'>";
         } else {
             messagePiece = "</span>";
         }
 
         return concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
     }
 
     /**
      * Process a piece of the message that has css content by creating a span with those css classes set
      *
      * @param messagePiece String piece with css class content
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return currentMessageComponent with the new textual content generated by this method appended to its
      *         messageText
      */
     private static Message processCssClassContent(String messagePiece, Message currentMessageComponent, View view) {
         if (!StringUtils.startsWithIgnoreCase(messagePiece, "/")) {
             messagePiece = StringUtils.remove(messagePiece, "'");
             messagePiece = StringUtils.remove(messagePiece, "\"");
             messagePiece = "<span class='" + StringUtils.removeStart(messagePiece,
                     KRADConstants.MessageParsing.CSS_CLASSES + "=") + "'>";
         } else {
             messagePiece = "</span>";
         }
 
         return concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
     }
 
     /**
      * Process a piece of the message that has link content by creating an anchor (a tag) with the href set
      *
      * @param messagePiece String piece with link content
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return currentMessageComponent with the new textual content generated by this method appended to its
      *         messageText
      */
     private static Message processLinkContent(String messagePiece, Message currentMessageComponent, View view) {
         if (!StringUtils.startsWithIgnoreCase(messagePiece, "/")) {
             //clean up href
             messagePiece = StringUtils.removeStart(messagePiece, KRADConstants.MessageParsing.LINK + "=");
             messagePiece = StringUtils.removeStart(messagePiece, "'");
             messagePiece = StringUtils.removeEnd(messagePiece, "'");
             messagePiece = StringUtils.removeStart(messagePiece, "\"");
             messagePiece = StringUtils.removeEnd(messagePiece, "\"");
 
             messagePiece = "<a href='" + messagePiece + "' target='_blank'>";
         } else {
             messagePiece = "</a>";
         }
 
         return concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
     }
 
     /**
      * Process a piece of the message that has action link content by creating an anchor (a tag) with the onClick set
      * to perform either ajaxSubmit or submit to the controller with a methodToCall
      *
      * @param messagePiece String piece with action link content
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return currentMessageComponent with the new textual content generated by this method appended to its
      *         messageText
      */
     private static Message processActionLinkContent(String messagePiece, Message currentMessageComponent, View view) {
         if (!StringUtils.startsWithIgnoreCase(messagePiece, "/")) {
             messagePiece = StringUtils.removeStart(messagePiece, KRADConstants.MessageParsing.ACTION_LINK + "=");
             String[] splitData = messagePiece.split(KRADConstants.MessageParsing.ACTION_DATA + "=");
 
             String[] params = splitData[0].trim().split("([,]+(?=([^']*'[^']*')*[^']*$))");
             String methodToCall = ((params.length >= 1) ? params[0] : "");
             String validate = ((params.length >= 2) ? params[1] : "true");
             String ajaxSubmit = ((params.length >= 3) ? params[2] : "true");
             String successCallback = ((params.length >= 4) ? params[3] : "null");
 
             String submitData = "null";
 
             if (splitData.length > 1) {
                 submitData = splitData[1].trim();
             }
 
             methodToCall = StringUtils.remove(methodToCall, "'");
             methodToCall = StringUtils.remove(methodToCall, "\"");
 
             messagePiece = "<a href=\"javascript:void(null)\" onclick=\"submitForm(" +
                     "'" +
                     methodToCall +
                     "'," +
                     submitData +
                     "," +
                     validate +
                     "," +
                     ajaxSubmit +
                     "," +
                     successCallback +
                     "); return false;\">";
 
             ViewPostMetadata viewPostMetadata = ViewLifecycle.getViewPostMetadata();
             if (viewPostMetadata != null) {
                 viewPostMetadata.addAccessibleMethodToCall(methodToCall);
                 viewPostMetadata.addAvailableMethodToCall(methodToCall);
             }
         } else {
             messagePiece = "</a>";
         }
 
         return concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
     }
 
     /**
      * Process a piece of the message that is assumed to have a valid html tag
      *
      * @param messagePiece String piece with html tag content
      * @param currentMessageComponent the state of the current text based message being built
      * @param view current View
      * @return currentMessageComponent with the new textual content generated by this method appended to its
      *         messageText
      */
     private static Message processHtmlContent(String messagePiece, Message currentMessageComponent, View view) {
         //raw html
         messagePiece = messagePiece.trim();
 
         if (StringUtils.startsWithAny(messagePiece, KRADConstants.MessageParsing.UNALLOWED_HTML) || StringUtils
                 .endsWithAny(messagePiece, KRADConstants.MessageParsing.UNALLOWED_HTML)) {
             throw new RuntimeException("The following html is not allowed in Messages: " + Arrays.toString(
                     KRADConstants.MessageParsing.UNALLOWED_HTML));
         }
 
         messagePiece = "<" + messagePiece + ">";
 
         return concatenateStringMessageContent(currentMessageComponent, messagePiece, view);
     }
 }