// $Id$
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css21;

import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssIdent;
import org.w3c.css.values.CssLength;
import org.w3c.css.values.CssNumber;
import org.w3c.css.values.CssPercentage;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;

import java.util.Arrays;

/**
 * @spec http://www.w3.org/TR/2011/REC-CSS2-20110607/fonts.html#font-size-props
 */
public class CssFontSize extends org.w3c.css.properties.css.CssFontSize {

    public static final CssIdent[] allowed_values;

    static {
        String[] absolute_values = {"xx-small", "x-small", "small", "medium", "large", "x-large", "xx-large"};
        String[] relative_values = {"smaller", "larger"};

        allowed_values = new CssIdent[absolute_values.length + relative_values.length];
        int i = 0;
        for (String s : absolute_values) {
            allowed_values[i++] = CssIdent.getIdent(s);
        }
        for (String s : relative_values) {
            allowed_values[i++] = CssIdent.getIdent(s);
        }
        Arrays.sort(allowed_values);
    }

    public static CssIdent getAllowedValue(CssIdent ident) {
        int idx = Arrays.binarySearch(allowed_values, ident);
        if (idx >= 0) {
            return allowed_values[idx];
        }
        return null;
    }

    /**
     * Create a new CssFontSize
     */
    public CssFontSize() {
    }

    /**
     * Creates a new CssFontSize
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssFontSize(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;

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

        switch (val.getType()) {
            case CssTypes.CSS_NUMBER:
                val = ((CssNumber) val).getLength();
            case CssTypes.CSS_LENGTH:
                CssLength l = (CssLength) val;
                if (!l.isPositive()) {
                    throw new InvalidParamException("negative-value",
                            val.toString(), ac);
                }
                value = l;
                break;
            case CssTypes.CSS_PERCENTAGE:
                CssPercentage p = (CssPercentage) val;
                if (!p.isPositive()) {
                    throw new InvalidParamException("negative-value",
                            val.toString(), ac);
                }
                value = p;
                break;
            case CssTypes.CSS_IDENT:
                CssIdent ident = (CssIdent) val;
                if (inherit.equals(ident)) {
                    value = inherit;
                    break;
                }
                value = getAllowedValue(ident);
                if (value == null) {
                    throw new InvalidParamException("value",
                            expression.getValue().toString(),
                            getPropertyName(), ac);
                }
                break;
            default:
                throw new InvalidParamException("value",
                        expression.getValue().toString(),
                        getPropertyName(), ac);
        }
        expression.next();
    }

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


}