/* LanguageTool, a natural language style checker 
 * Copyright (C) 2005 Daniel Naber (http://www.danielnaber.de)
 * 
 * This library 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 library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

package de.danielnaber.languagetool;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import de.danielnaber.languagetool.tools.StringTools;

/**
 * An array of {@link AnalyzedToken}s used to store multiple POS tags and lemmas
 * for a given single token.
 * 
 * @author Marcin Milkowski
 */
public class AnalyzedTokenReadings {

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + Arrays.hashCode(anTokReadings);
    result = prime * result + (isLinebreak ? 1231 : 1237);
    result = prime * result + (isParaEnd ? 1231 : 1237);
    result = prime * result + (isSentEnd ? 1231 : 1237);
    result = prime * result + (isSentStart ? 1231 : 1237);
    result = prime * result + (isWhitespace ? 1231 : 1237);
    result = prime * result + (isWhitespaceBefore ? 1231 : 1237);
    result = prime * result + startPos;
    result = prime * result + ((token == null) ? 0 : token.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    final AnalyzedTokenReadings other = (AnalyzedTokenReadings) obj;
    if (!Arrays.equals(anTokReadings, other.anTokReadings))
      return false;
    if (isLinebreak != other.isLinebreak)
      return false;
    if (isParaEnd != other.isParaEnd)
      return false;
    if (isSentEnd != other.isSentEnd)
      return false;
    if (isSentStart != other.isSentStart)
      return false;
    if (isWhitespace != other.isWhitespace)
      return false;
    if (isWhitespaceBefore != other.isWhitespaceBefore)
      return false;
    if (startPos != other.startPos)
      return false;
    if (token == null) {
      if (other.token != null)
        return false;
    } else if (!token.equals(other.token))
      return false;
    return true;
  }

  protected AnalyzedToken[] anTokReadings;
  private int startPos;
  private String token;

  private boolean isWhitespace;
  private boolean isLinebreak;
  private boolean isSentEnd;
  private boolean isSentStart;
  private boolean isParaEnd;

  private boolean isWhitespaceBefore;
  
  public AnalyzedTokenReadings(final AnalyzedToken[] r, final int startPos) {
    anTokReadings = r.clone();
    this.startPos = startPos;
    init();
  }
  
  public AnalyzedTokenReadings(final List<AnalyzedToken> list, final int startPos) {
    anTokReadings = list.toArray(new AnalyzedToken[list.size()]);
    this.startPos = startPos;
    init();
  }
    
  AnalyzedTokenReadings(final AnalyzedToken at) {
    anTokReadings = new AnalyzedToken[1];
    anTokReadings[0] = at;    
    isWhitespaceBefore = at.isWhitespaceBefore();
    init();
  }

  public AnalyzedTokenReadings(final AnalyzedToken at, final int startPos) {    
    this(at);    
    this.startPos = startPos;
  }
    
  private void init() {    
    token = anTokReadings[0].getToken();
    isWhitespace = StringTools.isWhitespace(token);
    isLinebreak = "\n".equals(token) || "\r\n".equals(token)
        || "\r".equals(token) || "\n\r".equals(token);
    isSentStart = JLanguageTool.SENTENCE_START_TAGNAME.equals(anTokReadings[0]
        .getPOSTag());
    isParaEnd = hasPosTag(JLanguageTool.PARAGRAPH_END_TAGNAME);
    isSentEnd = hasPosTag(JLanguageTool.SENTENCE_END_TAGNAME);
  }

  public final List<AnalyzedToken> getReadings() {
    return Arrays.asList(anTokReadings);
  }

  /**
   * Checks if the token has a particular POS tag.
   * 
   * @param pos
   *          POS Tag to check
   * @return True if it does.
   */
  public final boolean hasPosTag(final String pos) {
    boolean found = false;
    for (final AnalyzedToken reading : anTokReadings) {
      if (reading.getPOSTag() != null) {
        found = pos.equals(reading.getPOSTag());
        if (found) {
          break;
        }
      }
    }
    return found;
  }

  public final AnalyzedToken getAnalyzedToken(final int i) {
    return anTokReadings[i];
  }

  public final void addReading(final AnalyzedToken tok) {
    final ArrayList<AnalyzedToken> l = new ArrayList<AnalyzedToken>();
    for (int i = 0; i < anTokReadings.length - 1; i++) {
      l.add(anTokReadings[i]);
    }
    if (anTokReadings[anTokReadings.length - 1].getPOSTag() != null) {
      l.add(anTokReadings[anTokReadings.length - 1]);
    }
    tok.setWhitespaceBefore(isWhitespaceBefore);
    l.add(tok);    
    anTokReadings = l.toArray(new AnalyzedToken[l.size()]);
    if (tok.getToken().length() > token.length()) { //in case a longer token is added
      token = tok.getToken();
    }
    anTokReadings[anTokReadings.length - 1].
      setWhitespaceBefore(isWhitespaceBefore);
    isParaEnd = hasPosTag(JLanguageTool.PARAGRAPH_END_TAGNAME);
    isSentEnd = hasPosTag(JLanguageTool.SENTENCE_END_TAGNAME);     
  }   

  public final void removeReading(final AnalyzedToken tok) {
    final ArrayList<AnalyzedToken> l = new ArrayList<AnalyzedToken>();
    final AnalyzedToken tmpTok = new AnalyzedToken(tok.getToken(), tok
        .getPOSTag(), tok.getLemma());
    tmpTok.setWhitespaceBefore(isWhitespaceBefore);
    for (AnalyzedToken anTokReading : anTokReadings) {
      if (!anTokReading.equals(tmpTok)) {
        l.add(anTokReading);
      }
    }
    anTokReadings = l.toArray(new AnalyzedToken[l.size()]);
  }

  public final int getReadingsLength() {
    return anTokReadings.length;
  }

  public final boolean isWhitespace() {
    return isWhitespace;
  }
  
  /**
   * Returns true if the token equals \n, \r\n \n\r or \r\n.
   */
  public final boolean isLinebreak() {
    return isLinebreak;
  }

  public final boolean isSentStart() {
    return isSentStart;
  }

  /**
   * @return true when the token is a last token in a paragraph.
   */
  public final boolean isParaEnd() {
    return isParaEnd;
  }

  /**
   * Add PARA_END tag.
   */
  public void setParaEnd() {
    final AnalyzedToken paragraphEnd = new AnalyzedToken(getToken(),
        JLanguageTool.PARAGRAPH_END_TAGNAME, getAnalyzedToken(0).getLemma());
    addReading(paragraphEnd);    
  }

  /**
   * @return true when the token is a last token in a sentence.
   */
  public final boolean isSentEnd() {
    return isSentEnd;
  }
  
  /**
   * @since 0.9.9
   * @return true if the token is OpenOffice field code.
   */
  public final boolean isFieldCode() {
    return "\u0001".equals(token) || "\u0002".equals(token);
  }

  /**
   * Add a SENT_END tag.
   */
  public final void setSentEnd() {
    final AnalyzedToken sentenceEnd = new AnalyzedToken(getToken(),
        JLanguageTool.SENTENCE_END_TAGNAME, getAnalyzedToken(0).getLemma());
    addReading(sentenceEnd);    
  }

  public final int getStartPos() {
    return startPos;
  }

  public final void setStartPos(final int position) {
    startPos = position;
  }

  public final String getToken() {
    return token;
  }

  public final void setWhitespaceBefore(final boolean isWhite) {
    isWhitespaceBefore = isWhite;
    for (final AnalyzedToken aTok : anTokReadings) {
      aTok.setWhitespaceBefore(isWhite);
    }
  }

  public final boolean isWhitespaceBefore() {
    return isWhitespaceBefore;
  }

  @Override
  public String toString() {
    final StringBuilder sb = new StringBuilder();
    for (final AnalyzedToken element : anTokReadings) {
      sb.append(element);
    }
    return sb.toString();
  }

}