/**
 * Copyright (C) 2009 eXo Platform SAS.
 * 
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 * 
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.services.html.parser;


import org.exoplatform.services.chars.CharsUtil;
import org.exoplatform.services.chars.SpecChar;
import org.exoplatform.services.html.HTMLDocument;
import org.exoplatform.services.html.Name;
import org.exoplatform.services.token.TypeToken;
import org.exoplatform.services.token.TokenParser.Factory;

/**
 *
 * @author nhuthuan
 * Email: nhudinhthuan@yahoo.com
 */
@SuppressWarnings("serial")
public class CharsToken extends Factory<NodeImpl>
{

   private char[] script = {'s', 'c', 'r', 'i', 'p', 't'};

   private char[] style = {'s', 't', 'y', 'l', 'e'};

   private HTMLDocument document;

   public void setDocument(HTMLDocument document)
   {
      this.document = document;
   }

   public int create(char[] data, int start, int end, int type)
   {
      if (start >= end)
         return end;
      if (start > data.length)
         return data.length;
      char[] value = CharsUtil.cutAndTrim(data, start, Math.min(end, data.length));

      //    NodeConfig config = null;
      Name name;
      if (value.length < 1)
         return end;

      if (type != TypeToken.TAG)
      {
         if (type == TypeToken.COMMENT)
            name = Name.COMMENT;
         else
            name = Name.CONTENT;
         push(new NodeImpl(value, name));
         return end;
      }

      if (value[0] == SpecChar.END_TAG)
      {
         if (value.length <= 1)
            return end;
         value = CharsUtil.cutAndTrim(value, 1, value.length);
         name = HTML.getName(new String(value).toUpperCase());
         if (name != null)
         {
            push(new NodeImpl(value, name, TypeToken.CLOSE));
         }
         else
         {
            char[] newValue = new char[value.length + 1];
            newValue[0] = SpecChar.END_TAG;
            System.arraycopy(value, 0, newValue, 1, value.length);
            push(new NodeImpl(newValue, Name.UNKNOWN));
            return end;
         }
         return end;
      }
      String nameValue = new String(CharsUtil.cutBySpace(value, 0)).toUpperCase();
      if (nameValue.charAt(nameValue.length() - 1) == SpecChar.END_TAG)
      {
         nameValue = nameValue.substring(0, nameValue.length() - 1).trim();
      }
      if (nameValue.equals("!DOCTYPE"))
      {
         if (document != null)
            document.setDoctype(new NodeImpl(value, Name.DOCTYPE));
         return end;
      }
      name = HTML.getName(nameValue);
      if (name != null)
      {
         push(new NodeImpl(value, name, TypeToken.TAG));
      }
      else
      {
         push(new NodeImpl(value, Name.UNKNOWN));
         return end;
      }
      if (name == Name.SCRIPT)
      {
         return findEndScript(data, script, end);
      }
      else if (name == Name.STYLE)
      {
         return findEndScript(data, style, end);
      }
      return end;
   }

   private int findEndScript(char[] value, char[] c, int start)
   {
      int[] idx = indexEndNode(value, c, start);
      if (idx.length < 1)
         return start;
      create(value, start + 1, idx[0], TypeToken.CONTENT);
      return create(value, idx[1], idx[2], TypeToken.TAG);
   }

   private int[] indexEndNode(char[] value, char[] c, int start)
   {
      boolean is = false;
      int[] idx = new int[3];
      for (int i = start; i < value.length; i++)
      {
         if (value[i] != SpecChar.OPEN_TAG)
            continue;
         is = true;
         idx[0] = i;
         int k = i + 1;
         if (value[k] == SpecChar.PUNCTUATION_MASK && ParserService.getTokenParser().isComment(value, k))
         {
            int startComment = k;
            int endComment = ParserService.getTokenParser().findEndComment(value, k);
            startComment = create(value, startComment - 1, endComment, TypeToken.COMMENT);
            if (startComment < value.length && value[startComment] == SpecChar.OPEN_TAG)
            {
               i = startComment + 1;
               continue;
            }
            break;
         }
         while (k < value.length)
         {
            if (value[k] == SpecChar.END_TAG)
               idx[1] = k;
            if (value[k] != SpecChar.END_TAG && !Character.isWhitespace(value[k]))
               break;
            k++;
         }
         for (int j = 0; j < c.length; j++)
         {
            if (c[j] == Character.toLowerCase(value[k + j]))
               continue;
            if (k + j == value.length - 1)
            {
               is = false;
               break;
            }
            is = false;
            break;
         }
         if (!is)
            continue;
         k += c.length;
         while (k < value.length)
         {
            if (value[k] != SpecChar.END_TAG && !Character.isWhitespace(value[k]))
               break;
            k++;
         }
         if (k >= value.length)
            return new int[0];
         idx[2] = k;
         if (value[k] == SpecChar.CLOSE_TAG)
            return idx;
      }
      return new int[0];
   }

}
