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 * 
 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
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package org.openoffice.xmerge.converter.xml.sxc;

import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Element;

import org.openoffice.xmerge.converter.xml.Style;
import org.openoffice.xmerge.converter.xml.StyleCatalog;
import org.openoffice.xmerge.util.Debug;
import org.openoffice.xmerge.util.TwipsConverter;

/**
 *  Represents a text <code>Style</code> in an OpenOffice document.
 *
 *  @author	Martin Maher 
 */
public class ColumnStyle extends Style implements Cloneable {

	private	int colWidth = 0; 
    /**
     *  Constructor for use when going from DOM to client device format.
     *
     *  @param  node  The <i>style:style</i> <code>Node</code> containing
     *                the <code>Style</code>.  (This <code>Node</code> is
     *                assumed have a <i>family</i> attribute of <i>text</i>).
     *  @param  sc    The <code>StyleCatalog</code>, which is used for
     *                looking up ancestor <code>Style</code> objects.
     */
    public ColumnStyle(Node node, StyleCatalog sc) {
        super(node, sc);
        
        // Run through the attributes of this node, saving
        // the ones we're interested in.
        NamedNodeMap attrNodes = node.getAttributes();
        if (attrNodes != null) {
            int len = attrNodes.getLength();
            for (int i = 0; i < len; i++) {
                Node attr = attrNodes.item(i);
                handleAttribute(attr.getNodeName(), attr.getNodeValue());
            }
        }
        
        // Look for children.  Only ones we care about are "style:properties"
        // nodes.  If any are found, recursively traverse them, passing
        // along the style element to add properties to.
        if (node.hasChildNodes()) {
            NodeList children = node.getChildNodes();
            int len = children.getLength();
            for (int i = 0; i < len; i++) {
                Node child = children.item(i);
                String name = child.getNodeName();
                if (name.equals("style:properties")) {
                    NamedNodeMap childAttrNodes = child.getAttributes();
                    if (childAttrNodes != null) {
                        int nChildAttrNodes = childAttrNodes.getLength();
                        for (int j = 0; j < nChildAttrNodes; j++) {
                            Node attr = childAttrNodes.item(j);
                            handleAttribute(attr.getNodeName(),
                            attr.getNodeValue());
                        }
                    }
                }
            }
        }
    }
    
    
    /**
     *  Constructor for use when going from client device format to DOM
     *
     *  @param  name     Name of text <code>Style</code>.  Can be null.
     *  @param  family   Family of text <code>Style</code> (usually
     *                   <i>text</i>).  Can be null.
     *  @param  parent   Name of parent text <code>Style</code>, or null
     *                   for none.
     *  @param  colWidth the width of this column 
     *  @param sc        The <code>StyleCatalog</code>, which is used for
     *                   looking up ancestor <code>Style</code> objects.
     */
    public ColumnStyle(String name, String family, String parent,int colWidth, StyleCatalog sc) {
        super(name, family, parent, sc);
		this.colWidth = colWidth;
	}

	/**
	 * Returns the width of this column
	 *
	 * @return the <code>Format</code> object 
	 */
	public int getColWidth() {
		return colWidth;
	}
	
	/**
	 * Sets the width of this column
	 *
	 * @param colWidth the column width
	 */
	public void setColWidth(int colWidth) {

		this.colWidth = colWidth;
	}
	
    /**
     *  Parse a colwidth in the form "1.234cm" to twips  
     *
     *  @param  value  <code>String</code> specification to parse.
     *
     *  @return  The twips equivalent.
     */
    private int parseColWidth(String value) {

		int width = 255;	// Default value
		
		if(value.indexOf("cm")!=-1) {
			float widthCM = Float.parseFloat(value.substring(0,value.indexOf("c")));
			width = TwipsConverter.cm2twips(widthCM);
		} else if(value.indexOf("inch")!=-1) {
			float widthInch = Float.parseFloat(value.substring(0,value.indexOf("i")));
			width = TwipsConverter.inches2twips(widthInch);
		}
		
		return (width);
    }
 

    /**
     *  Set an attribute.
     *
     *  @param  attr   The attribute to set.
     *  @param  value  The attribute value to set.
     */
    private void handleAttribute(String attr, String value) {
        
        if (attr.equals("style:column-width")) {
			colWidth = parseColWidth(value);
        }
        else {
            Debug.log(Debug.INFO, "ColumnStyle Unhandled: " + attr + "=" + value);
        }
    }
    
    
    /**
     *  Return a <code>Style</code> object corresponding to this one, 
     *  but with all of the inherited information from parent
     *  <code>Style</code> objects filled in.  The object returned will
     *  be a new object, not a reference to this object, even if it does
     *  not need any information added.
     *
     *  @return  The <code>StyleCatalog</code> in which to look up
     *           ancestors.
     */
    public Style getResolved() {
        // Create a new object to return, which is a clone of this one.
        ColumnStyle resolved = null;
        try {
            resolved = (ColumnStyle)this.clone();
        } catch (Exception e) {
            Debug.log(Debug.ERROR, "Can't clone", e);
        }
        
        // Look up the parentStyle.  (If there is no style catalog
        // specified, we can't do any lookups.)
        ColumnStyle parentStyle = null;
        if (sc != null) {
            if (parent != null) {
                parentStyle = (ColumnStyle)sc.lookup(parent, family, null,
                           this.getClass());
                if (parentStyle == null)
                    Debug.log(Debug.ERROR, "parent style lookup of "
                      + parent + " failed!");
                else
                    parentStyle = (ColumnStyle)parentStyle.getResolved();

            } else if (!name.equals("DEFAULT_STYLE")) {
                parentStyle = (ColumnStyle)sc.lookup("DEFAULT_STYLE", null,
                    null, this.getClass());
            }
        }
        
        // If we found a parent, for any attributes which we don't have
        // set, try to get the values from the parent.
        if (parentStyle != null) {
            parentStyle = (ColumnStyle)parentStyle.getResolved();
		   	
            if ((colWidth == 0) && (parentStyle.getColWidth() != 0))
                resolved.setColWidth(parentStyle.getColWidth());
        }
        return resolved;
    }
    
    
    /**
     *  Create a new <code>Node</code> in the <code>Document</code>, and
     *  write this <code>Style</code> to it.
     *
     *  @param  parentDoc  Parent <code>Document</code> of the
     *                    <code>Node</code> to create.
     *  @param  name       Name to use for the new <code>Node</code> (e.g.
     *                    <i>style:style</i>)
     *
     *  @return  Created <code>Node</code>.
     */
    public Node createNode(org.w3c.dom.Document parentDoc, String name) {
        Element node = parentDoc.createElement(name);
        writeAttributes(node);
        return node;
    }
    
    
    /**
     *  Return true if <code>style</code> specifies as much or less 
     *  than this <code>Style</code>, and nothing it specifies
     *  contradicts this <code>Style</code>.
     *
     *  @param  style  The <code>Style</code> to check.
     *
	 *  @return  true if <code>style</code> is a subset, false
     *           otherwise.
     */
    public boolean isSubset(Style style) {
        if (style.getClass() != this.getClass()) 
                return false;
        ColumnStyle tStyle = (ColumnStyle)style;
        
		if(colWidth!=tStyle.getColWidth())
			return false;

        return true;
    }
    
    
    /**
     *  Write this <code>Style</code> object's attributes to a
     *  <code>Node</code> in the <code>Document</code>.
     *
     *  @param  node  The <code>Node</code> to add <code>Style</code>
     *                attributes.
     */
    public void writeAttributes(Element node) {

		if(colWidth!=0) {
			String width = TwipsConverter.twips2cm(colWidth) + "cm"; 
			node.setAttribute("style:column-width", width);
		}
    }


    private static String[] ignored = {
        "fo:break-before", "fo:keep-with-next"
    };


    /*
     * This code checks whether an attribute is one that we
     * intentionally ignore.
     *
     *  @param  attribute  The attribute to check.
     *
     *  @return  true if <code>attribute</code> can be ignored,
     *           otherwise false.
     */
    private boolean isIgnored(String attribute) {
        for (int i = 0; i < ignored.length; i++) {
            if (ignored[i].equals(attribute)) 
                return true;
        }
        return false;
    }
}