/*
    *******************************************************************************
    * Copyright (c) 2005 Chris Rose and AIMedia
    * All rights reserved. NutritionDataFood and the accompanying materials
    * are made available under the terms of the Common Public License v1.0
    * which accompanies this distribution, and is available at
    * http://www.eclipse.org/legal/cpl-v10.html
    * 
    * Contributors:
   *     Chris Rose
   *******************************************************************************/
  package ca.spaz.cron.datasource.www;
  
  import java.io.IOException;
  import java.util.*;
  import java.util.regex.*;
  
  import javax.swing.text.BadLocationException;
  
  import org.apache.log4j.Logger;
  import org.xml.sax.SAXException;
  
  import ca.spaz.cron.database.*;
  import ca.spaz.cron.datasource.*;
  
  import com.meterware.httpunit.*;
  
  /***
   * A Food implementation for NutritionDataDatasource 
   * @author Chris Rose
   */
  public class NutritionDataFood implements Food {
     /***
      * Logger for this class
      */
     private static final Logger logger = Logger
           .getLogger(NutritionDataFood.class);
     
     private static final Pattern MEASURE = Pattern.compile("(.+?)//(([^)]+)g//)");
     private NutritionDataDatasource source;
  
     private String description;
  
     private List measures;
  
     public NutritionDataFood(NutritionDataDatasource source, WebResponse response) {
        super();
        this.source = source;
        try {
           loadWebData(response);
        } catch (IOException e) {
           throw new FoodDatasourceException("Error reading web data for food", e);
        } catch (BadLocationException e) {
           throw new FoodDatasourceException("Error reading web data for food", e);
        } catch (SAXException e) {
           throw new FoodDatasourceException("Error reading web data for food", e);
        }
     }
  
     /***
      * @todo Load measures
      * @todo Load food group
      * @todo load nutrients
      * @todo set baseline values.
      * @todo Parse the table layout of this page in order to get the info we need.
      * @param response
      * @throws IOException
      * @throws BadLocationException
      * @throws SAXException
      */
     private void loadWebData(WebResponse response) throws IOException, BadLocationException, SAXException {
        WebTable mainTable = getTable(response);
        if (null == mainTable) {
           throw new FoodDatasourceException("Error in food construction, web table structure has changed.");
        }
        loadName(mainTable);
        loadMeasures(mainTable);
        // Nutrients start at getTables(4)
     }
     
     private void loadMeasures(WebTable mainTable) {
        
        measures = new ArrayList();
        
        TableCell topcell = mainTable.getTableCell(0,0);
        WebTable tbl = topcell.getTables()[0];
        TableCell cell = tbl.getTableCell(1,0);
        tbl = cell.getTables()[0];
        cell = tbl.getTableCell(0,1);
        // At this point, we should have the whole shebang. Groups 2 and 3 of the expression
        String cellText = cell.getText();
        Matcher m = MEASURE.matcher(cellText);
        int idx = 0;
        while (m.find(idx)) {
           Measure meas = new Measure();
           meas.setAmount(1);
           meas.setDescription(m.group(1));
           meas.setGrams(Double.parseDouble(m.group(2)));
           measures.add(meas);
          idx = m.end();
       }
    }
 
    private void loadName(WebTable mainTable) {
       TableCell cell = mainTable.getTableCell(0,0); // This is the title table cell
       WebTable tbl = cell.getTables()[0]; // This is the table the title is in
       TableCell tcell = tbl.getTableCell(0,0); // This is the title cell;
       setDescription(tcell.getText());
    }
 
    private WebTable getTable(WebResponse response) {
       // This is quite fragile.  Even a small change to the page layout will BORK this.
       // This is quite fragile.  Even a small change to the page layout will BORK this.
       WebTable tbl = null;
       try {
          tbl = response.getTables()[0].getTableCell(1,0).getTables()[0].getTableCell(0,0).getTables()[0];
       } catch (SAXException e) {
          logger.error("getTable(WebResponse)", e);
       } catch (NullPointerException e) {
          logger.error("getTable(WebResponse)", e);
       } catch (ArrayIndexOutOfBoundsException e) {
          logger.error("getTable(WebResponse)", e);
       }
       return tbl;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getFoodGroup()
     */
    public FoodGroup getFoodGroup() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getSource()
     */
    public String getSource() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getMeasures()
     */
    public List getMeasures() {
       return Collections.unmodifiableList(measures);
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#setMeasures(java.util.List)
     */
    public void setMeasures(List measures) {
       this.measures.clear();
       this.measures.addAll(measures);
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getCalories()
     */
    public double getCalories() {
       return 0;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getMacroNutrients()
     */
    public MacroNutrients getMacroNutrients() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getDescription()
     */
    public String getDescription() {
       return this.description;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getMinerals()
     */
    public Minerals getMinerals() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getVitamins()
     */
    public Vitamins getVitamins() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getAminoAcids()
     */
    public AminoAcids getAminoAcids() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getLipids()
     */
    public Lipids getLipids() {
       return null;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getNutrientAmount(ca.spaz.cron.database.NutrientInfo)
     */
    public double getNutrientAmount(NutrientInfo ni) {
       return 0;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#setNutrientAmount(ca.spaz.cron.database.NutrientInfo, double)
     */
    public void setNutrientAmount(NutrientInfo ni, double val) {
 
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#setDescription(java.lang.String)
     */
    public void setDescription(String text) {
       this.description = text;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#setFoodGroup(ca.spaz.cron.database.FoodGroup)
     */
    public void setFoodGroup(FoodGroup foodGroup) {
 
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getNumTimesConsumed()
     */
    public int getNumTimesConsumed() {
       return 0;
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#setSource(java.lang.String)
     */
    public void setSource(String string) {
 
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getDataSource()
     */
    public IFoodDatasource getDataSource() {
       return source;
    }
 
    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    public String toString() {
       return getDescription();
    }
 
    /* (non-Javadoc)
     * @see ca.spaz.cron.database.Food#getSourceUID()
     */
    public String getSourceUID() {
       return null;
    }
 
    public void setModified() {
       // TODO Auto-generated method stub
       
    }
 
    public void setSourceUID(String uid) {
       // TODO Auto-generated method stub
       
    }
 
 }