//
// $Id$
// From Philippe Le Hegaret (Philippe.Le_Hegaret@sophia.inria.fr)
//
// (c) COPYRIGHT MIT and INRIA, 1997.
// Please first read the full copyright statement in file COPYRIGHT.html
/*
 */

package org.w3c.css.font;

import java.util.Vector;
import java.util.Enumeration;
import org.w3c.css.util.Util;
import org.w3c.css.properties.CssProperty;
import org.w3c.css.values.CssOperator;
import org.w3c.css.parser.CssStyle;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssString;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.util.ApplContext;

/** 
 */
public class FontFamily extends FontProperty implements CssOperator {
    
    Vector family_name = new Vector();

    /**
     * Create a new FontFamily
     */
    public FontFamily() {
    }  
    
    /**
     * Create a new FontFamily
     *
     * @param expression the font name
     * @exception InvalidParamException The expression is incorrect
     */
    public FontFamily(ApplContext ac, CssExpression expression) 
	    throws InvalidParamException {
	boolean family = true;
	CssValue val = expression.getValue();
	char op;

	setByUser();
	//@@ and if name is already in the vector ?
	

	while (family) {
	    val = expression.getValue();
	    op = expression.getOperator();
	    
	    if ((op != COMMA) && (op != SPACE)) {
		throw new InvalidParamException("operator", 
						((new Character(op)).toString()),
						ac);
	    }
	    
	    if (val instanceof CssString) {
		if (op == COMMA) { // "helvetica", "roman"
		    String name = (String) val.get();
		    family_name.addElement(trimToOneSpace(name));
		    expression.next();
		} else { // "helvetica" CssValue
		    String name = (String) val.get();
		    family_name.addElement(trimToOneSpace(name));
		    family = false;
		    expression.next();
		}
	    } else if (val instanceof CssIdent) {
		if (op == COMMA) {
		    family_name.addElement(val.toString());
		    expression.next();
		} else {
		    CssValue next = expression.getNextValue();
		    
		    if (next instanceof CssIdent) {
			CssIdent New = new CssIdent(val.get() + " " 
						    + next.get());
			expression.remove();
			op = expression.getOperator();
			expression.remove();
			expression.insert(New);
			expression.setCurrentOperator(op);
		    } else {
			family_name.addElement(val.toString());
			expression.next();
			family = false;
		    }
		}
	    } else
		throw new InvalidParamException("value", expression.getValue(),
						getPropertyName(), ac);
	}
	
    }
    
    /**
     * Returns all fonts name
     */  
    public Enumeration elements() {
	return family_name.elements();
    }
    
    /**
     * Returns the size
     */
    public int size() {
	return family_name.size();
    }
    
    /**
     * Returns the font (null if no font)
     */  
    public Object get() {
	if (family_name.size() == 0) {
	    return null;
	}
	return family_name.firstElement();
    }
    
    /**
     * Returns a string representation of the object.
     */
    public String toString() {
	String r = "";
	for (Enumeration e = elements(); e.hasMoreElements();)
	    r += ", " + convertString(e.nextElement().toString());
	if (r.length() < 3) {
	    return null;
	}
	return r.substring(2);
    }
    
    String convertString (String value) {
	if (value.indexOf('"') != -1) {
	    return '\'' + value + '\'';
	} else if (value.indexOf('\'') != -1) {
	    return '"' + value + '"';	    
	} else {
	    return value;
	}
    }

    /**
     * Returns the name of this property
     */  
    public String getPropertyName() {
	return "font-family";
    }
    
    /**
     * Add this property to the CssStyle.
     *
     * @param style The CssStyle
     */
    public void addToStyle(ApplContext ac, CssStyle style) {
	Css2Style style0 = (Css2Style) style;

	if (style0.fontFamily != null) {
	    style.addRedefinitionWarning(ac, this);
	}
	style0.fontFamily = this;
    }
    
    /**
     * Get this property in the style.
     *
     * @param style The style where the property is
     * @param resolve if true, resolve the style to find this property
     */  
    public CssProperty getPropertyInStyle(CssStyle style, boolean resolve) {
	if (resolve) {
	    return ((Css2Style) style).getFaceFontFamily();
	} else {
	    return ((Css2Style) style).fontFamily;
	}
    }
    
    /**
     * Compares two properties for equality.
     *
     * @param value The other property.
     */  
    public boolean equals(CssProperty property) {
	return false; //@@ FIXME
    }
    
    private static String trimToOneSpace(String name) {
	int count = name.length();
	char[] dst = new char[count];
	char[] src = new char[count];
	int index = -1;
	
	name.getChars(0, count, src, 0);
	for(int i=0; i < count; i++)
	    if ( i == 0 || ! Util.isWhiteSpace(src[i]) || 
		 ( Util.isWhiteSpace(src[i]) && 
		   !Util.isWhiteSpace(dst[index]) ) )
		dst[++index] = src[i];
	
	return new String(dst, 0, index+1);
    }
    
}
