/*******************************************************************************
 * Copyright (c) 2010 Boeing.
 * 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:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.ote.message;

import java.io.Serializable;
import java.util.LinkedList;
import java.util.List;

/**
 * @author Ken J. Aguilar
 */
public class ElementPath implements Serializable {

   private static final long serialVersionUID = 4928814252711879251L;

   private final List<Object> elementPath;
   private String elementPathAsString = null;
   private final boolean isHeaderElement;

   public static ElementPath decode(String encodedPath) {
      List<Object> path = new LinkedList<>();
      String[] components = encodedPath.split("\\+");

      for (String component : components) {
         try {
            Integer i = Integer.parseInt(component);
            path.add(i);
         } catch (NumberFormatException e) {
            path.add(component);
         }
      }

      return new ElementPath(path);
   }

   public String getMessageClass() {
      return elementPath.get(0).toString();
   }

   public boolean isHeaderElement() {
      return isHeaderElement;
   }

   public String getElementName() {
      return elementPath.get(elementPath.size() - 1).toString();
   }

   public ElementPath(List<Object> path) {
      elementPath = path;
      String string = (String) path.get(1);
      isHeaderElement = string.startsWith("HEADER(");

   }

   public List<Object> getList() {
      return elementPath;
   }

   @Override
   public String toString() {
      if (elementPathAsString == null) {
         StringBuilder sb = new StringBuilder(64);
         if (isHeaderElement) {
            String string = (String) elementPath.get(1);
            String headerName = string.substring(string.indexOf('(') + 1, string.indexOf(')'));
            sb.append(headerName).append("-HEADER").append('.').append(elementPath.get(2).toString());
         } else {
            for (int i = 1; i < elementPath.size(); i++) {
               Object obj = elementPath.get(i);
               if (obj instanceof Integer) {
                  sb.delete(sb.length() - 1, sb.length());
                  sb.append('[');
                  sb.append(((Integer) obj).intValue());
                  sb.append(']');
               } else {

                  sb.append(obj.toString());
               }
               sb.append('.');
            }
            sb.deleteCharAt(sb.length() - 1);
         }
         elementPathAsString = sb.toString();
      }
      return elementPathAsString;
   }

   public String encode() {

      StringBuilder buffer = new StringBuilder(256);
      for (Object component : elementPath) {
         buffer.append(component.toString());
         buffer.append('+');
      }
      buffer.deleteCharAt(buffer.length() - 1);
      return buffer.toString();
   }

}