//
// $Id: CssFitPosition.java,v 1.2 2005-09-14 15:15:04 ylafon Exp $
// From Sijtsche de Jong (sy.de.jong@let.rug.nl)
//
// (c) COPYRIGHT 1995-2000  World Wide Web Consortium (MIT, INRIA, Keio University)
// Please first read the full copyright statement at
// http://www.w3.org/Consortium/Legal/copyright-software-19980720

package org.w3c.css.properties.css3;

import org.w3c.css.parser.CssStyle;
import org.w3c.css.properties.css1.CssProperty;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.util.Util;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssLength;
import org.w3c.css.values.CssOperator;
import org.w3c.css.values.CssPercentage;
import org.w3c.css.values.CssValue;


public class CssFitPosition extends CssProperty implements CssOperator {

    String fitpos = new String();
    ApplContext ac;
    CssIdent auto = new CssIdent("auto");
    CssIdent initial = new CssIdent("initial");
    CssIdent top = new CssIdent("top");
    CssIdent center = new CssIdent("center");
    CssIdent bottom = new CssIdent("bottom");

    CssIdent left = new CssIdent("left");
    CssIdent right = new CssIdent("right");

    /**
     * Create a new CssFitPosition
     */
    public CssFitPosition() {
	fitpos = "0% 0%";
    }

    /**
     * Create a new CssFitPosition
     *
     * @param expression The expression for this property
     * @exception InvalidParamException Values are incorrect
     */
    public CssFitPosition(ApplContext ac, CssExpression expression,
	    boolean check) throws InvalidParamException {

	this.ac = ac;
	setByUser(); // tell this property is set by the user
	CssValue val = expression.getValue();
	char op = expression.getOperator();

	if (op == SPACE) {

	    val = expression.getValue();

	    if (val != null) {

		if (val instanceof CssIdent) {
		    if (val.equals(top)) {
			fitpos += " " + val.toString();
		    } else if (val.equals(center)) {
			fitpos += " " + val.toString();
		    } else if (val.equals(bottom)) {
			fitpos += " " + val.toString();
		    } else if (val.equals(initial)) {
			fitpos += " " + val.toString();
		    } else {
			throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
		    }

		    expression.next();
		    op = expression.getOperator();
		    val = expression.getValue();

		    if (val != null && val instanceof CssIdent) {
			if (val.equals(left)) {
			    fitpos += " " + val.toString();
			} else if (val.equals(center)) {
			    fitpos += " " + val.toString();
			} else if (val.equals(right)) {
			    fitpos += " " + val.toString();
			} else {
			    throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
			}
		    }

		    expression.next();

		} else if (val instanceof CssLength) {
		    fitpos += " " + val.toString();

		    expression.next();
		    op = expression.getOperator();
		    val = expression.getValue();

		    if (val != null && val instanceof CssLength) {
			fitpos += " " + val.toString();
			expression.next();
		    } else if (val instanceof CssPercentage) {
			fitpos += " " + val.toString();
			expression.next();
		    }

		} else if (val instanceof CssPercentage) {
		    fitpos += " " + val.toString();

		    expression.next();
		    op = expression.getOperator();
		    val = expression.getValue();

		    if (val != null && val instanceof CssLength) {
			fitpos += " " + val.toString();
			expression.next();
		    } else if (val instanceof CssPercentage) {
			fitpos += " " + val.toString();
			expression.next();
		    }

		} else {
		    throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
		}
	    }

	}
	else if (val instanceof CssIdent) {
	    if (val.equals(inherit)) {
		fitpos = "inherit";
		expression.next();
	    } else if (val.equals(auto)) {
		fitpos = "auto";
		expression.next();
	    } else if (val.equals(initial)) {
		fitpos = "initial";
		expression.next();
	    }
	}
	else {
	    throw new InvalidParamException("value", val.toString(), getPropertyName(), ac);
	}
    }

    public CssFitPosition(ApplContext ac, CssExpression expression)
    throws InvalidParamException {
	this(ac, expression, false);
    }

    /**
     * Brings all values back between 0 and 1
     *
     * @param opac The value to be modified if necessary
     */
    private float clampedValue(ApplContext ac, float opac) {
	if (opac < 0 || opac > 1) {
	    ac.getFrame().addWarning("out-of-range", Util.displayFloat(opac));
	    return ((opac<0)?0:1);
	}
	else return(opac);
    }

    /**
     * Add this property to the CssStyle.
     *
     * @param style The CssStyle
     */
    public void addToStyle(ApplContext ac, CssStyle style) {
	if (((Css3Style) style).cssFitPosition != null)
	    style.addRedefinitionWarning(ac, this);
	((Css3Style) style).cssFitPosition = 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 ((Css3Style) style).getFitPosition();
	} else {
	    return ((Css3Style) style).cssFitPosition;
	}
    }

    /**
     * Compares two properties for equality.
     *
     * @param value The other property.
     */
    public boolean equals(CssProperty property) {
	return (property instanceof CssFitPosition &&
		fitpos.equals( ((CssFitPosition) property).fitpos));
    }

    /**
     * Returns the name of this property
     */
    public String getPropertyName() {
	return "fit-position";
    }

    /**
     * Returns the value of this property
     */
    public Object get() {
	return fitpos;
    }

    /**
     * Returns true if this property is "softly" inherited
     */
    public boolean isSoftlyInherited() {
	return fitpos.equals("inherit");
    }

    /**
     * Returns a string representation of the object
     */
    public String toString() {
	return fitpos;
    }

    /**
     * Is the value of this property a default value
     * It is used by all macro for the function <code>print</code>
     */
    public boolean isDefault() {
	return fitpos.equals("0% 0%");
    }

}

