/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: Xiao F. Yu, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.cdm;

import org.greenstone.gatherer.DebugStream;
import org.greenstone.gatherer.util.Codec;
import org.greenstone.gatherer.util.StaticStrings;
import org.greenstone.gatherer.util.XMLTools;
import org.w3c.dom.*;
import org.greenstone.gatherer.metadata.MetadataElement;
import org.greenstone.gatherer.metadata.MetadataTools;


/** This class is the greenstone 3 version of the Format.java in gs2 for handling 'gsf' format statements.
 */
public class Format4gs3 implements DOMProxyListEntry {
    
    /** The element this format is based on. */
    private Element element = null;
    /** We keep a copy of the feature name */
    private String feature_name = null;
    /** The format statement for this feature (also contains classifier options if its a classifier), used by the format list on the top in GLI. */
    private String feature_format = null;
    
    /** The format statement for this feature (does not contain options in the front), displayed in the format editor at the bottom in GLI. 
     *  If this format is not a classifier, feature_format==pure_format*/
    private String pure_format = null;
    
    /** Wether this feature is about a classifier. The other way to check this is to see if feature_name starts with "CL" */
    private static boolean is_classifier = false;
    /** If this format is about a classifier, this contains all its options */
    private String classifier_options = "";
    
    /** Constructor only to be used during DOMProxyListModel initialization. */
    public Format4gs3 () {
        
    }
    /** Constructor for a format-string format command.
     * @param element The <Strong>element</strong> this format object contains.
     */
    public Format4gs3 (Element element) {
        this.element = element;
        
        is_classifier = element.getParentNode().getNodeName().equals(StaticStrings.CLASSIFY_ELEMENT);
        
        if(is_classifier) {
            //The getClassifierPosition() method also sets the classifier_options variable.
            feature_name = Classifier.CLASSIFIER_PREFIX + getClassifierPosition(element);   
            Classifier classifier = getClassifier(feature_name);
            //set the classifier_options string
            classifier_options = classifier.toString();

                    
            pure_format = toOneLineFormat(XMLTools.getNodeText(element));
            feature_format = classifier_options + " " + pure_format;
        } else {
            feature_name = element.getAttribute(StaticStrings.NAME_ATTRIBUTE);
            feature_format = toOneLineFormat(XMLTools.getNodeText(element));
            pure_format = feature_format;
        }

     }
    //
    public Format4gs3 (String feature_name, String feature_format) {
        this.feature_name = feature_name;
        this.feature_format = feature_format;
        this.pure_format = feature_format;
        
        is_classifier = feature_name.startsWith (Classifier.CLASSIFIER_PREFIX);
        
        element = CollectionConfiguration.createElement (StaticStrings.FORMAT_STR);
        if(is_classifier) {
            
            //Now get the options of the classifier
            Classifier classifier = getClassifier(feature_name);
            //set the classifier_options string
            classifier_options = classifier.toString();
            
            feature_format = classifier_options + " " + feature_format;
        } else {
            element.setAttribute (StaticStrings.NAME_ATTRIBUTE, feature_name);
        }

        XMLTools.setNodeText(element, toOneLineFormat(pure_format));

    }
    public int getClassifierPosition(Element element) {
        //we could also here use 'element.getParentNode().getParentNode()' to get this root node
        Element root = CollectionDesignManager.collect_config.getDocumentElement ();
        NodeList classify_list = root.getElementsByTagName(StaticStrings.CLASSIFY_ELEMENT);   
        int num_classify_elements = classify_list.getLength();
        for(int i=0; i<num_classify_elements; i++) {
            Element classify = (Element)classify_list.item(i);
            Element format = (Element)XMLTools.getChildByTagName(classify, StaticStrings.FORMAT_STR);
            if(format == element) {
                //Now get the options of the classifier
                Classifier classifier = CollectionDesignManager.classifier_manager.getClassifier(i);
                classifier_options = classifier.toString();
                // i+1 because java is from 0 up, greenstone starts from 1.
                return i + 1;
            }
        }
        return -1;
    }
    public static Classifier getClassifier(String feature_name) {
            int index = Integer.parseInt(feature_name.substring(Classifier.CLASSIFIER_PREFIX.length()));
            Classifier classifier = CollectionDesignManager.classifier_manager.getClassifier(index-1);
            return classifier;
    }
    //This method is used when the add button is clicked and a new format element for a classifier is added to
    // the DOM tree, we need to figure out which Classify element to append this format element to.
    public Element getClassifyElement () {
        
        //String name = classifier.getPositionString();
        int classifier_index = Integer.parseInt (feature_name.substring (Classifier.CLASSIFIER_PREFIX.length ()));
        Element root = CollectionDesignManager.collect_config.getDocumentElement ();
        NodeList classify_list = root.getElementsByTagName (StaticStrings.CLASSIFY_ELEMENT);
        
        // - 1 because java is from 0 up, greenstone starts from 1.
        classifier_index = classifier_index - 1;
        return (Element)classify_list.item (classifier_index);
    }
            
    /** Method to translate this class information into a line of text as you would expect on the format list panel
     * @return A <strong>String</strong> containing the format command.
     */
    public String toString () {

        return feature_name + " " + toOneLineFormat(feature_format);
    }
    public void update () {
     
        if (is_classifier) {
           feature_name = Classifier.CLASSIFIER_PREFIX + getClassifierPosition(element); 
           Classifier classifier = getClassifier(feature_name);
            //update the classifier_options string
            classifier_options = classifier.toString();
            pure_format = toOneLineFormat(XMLTools.getNodeText(element));
            feature_format = classifier_options + " " + pure_format;
        }
    }    
    public String getFormatedFormat() {
        return toFormatedFormat(feature_format);
    }
    public String getPureFormat() {
        return toFormatedFormat(pure_format);
    }
    
    public Classifier getClassifier() {
        if(!isClassifier()) {
            
            return null;
        }
        int index = Integer.parseInt(feature_name.substring(Classifier.CLASSIFIER_PREFIX.length()));
        //index-1 because java indexes from 0, but greenstone is from 1.
        index = index - 1;
        return CollectionDesignManager.classifier_manager.getClassifier(index);
    }
    public void setFeatureName (String name) {
        feature_name = name;
    }
    /** Set the value of value. Hmmm.
     * @param value The new value from value as a <strong>String</strong>.
     */
    public void setFeatureFormat (String value) {
        if(is_classifier) {
          feature_format = classifier_options + " " + value;
        } else {
          feature_format = value;
        }
    }
    public void setPureFormat (String value) {
        pure_format = value;
        setFeatureFormat (value);
        XMLTools.setNodeText(element, pure_format);
    }
    public static String toOneLineFormat(String str) {
        return str.replaceAll("\n", "").replaceAll("  ", "").replaceAll(" <", "<");
    }
    public static String toFormatedFormat(String str) {
        return str.replaceAll("  ", "").replaceAll("<", "\n<").replaceFirst("\n", "");
    }
    public int compareTo (Object object) {
        if(object == null) { // It seems that occasionally compareTo is called and somehow null ends up in comparison.
            return -1;
        }
        return this.getFeatureName ().compareToIgnoreCase (((Format4gs3)object).getFeatureName());
    }
    
    public DOMProxyListEntry create (Element element) {
        return new Format4gs3 (element);
    }
    
    public boolean equals (Object object) {
        return (compareTo (object) == 0);
    }
    
    public Element getElement () {
        return element;
    }
    public boolean isClassifier() {
        return feature_name.startsWith(Classifier.CLASSIFIER_PREFIX);
    }
    public String getFeatureName () {
        return feature_name;
    }
    //The format appended as a row of string used to display in the format list panel
    public String getFeatureFormat () {
        return feature_format;
    }    
    public void setElement (Element element) {
        this.element = element;
    }
    public boolean isAssigned() {
        return true;
    }

    public void setAssigned(boolean assigned) {
    }

}