//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2021.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

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.CssTypes;
import org.w3c.css.values.CssValue;

/**
 * @spec https://www.w3.org/TR/2020/WD-css-text-decor-4-20200506/#text-underline-offset-property
 */
public class CssTextUnderlineOffset extends org.w3c.css.properties.css.CssTextUnderlineOffset {

    public static final CssIdent auto;

    static {
        auto = CssIdent.getIdent("auto");
    }


    public static final CssIdent getAllowedValue(CssIdent ident) {
        if (auto.equals(ident)) {
            return auto;
        }
        return null;
    }

    /**
     * Create a new CssTextUnderlineOffset
     */
    public CssTextUnderlineOffset() {
        value = initial;
    }

    /**
     * Creates a new CssTextUnderlineOffset
     *
     * @param expression The expression for this property
     * @throws InvalidParamException Expressions are incorrect
     */
    public CssTextUnderlineOffset(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.getCheckableValue().getLength();
            case CssTypes.CSS_LENGTH:
            case CssTypes.CSS_PERCENTAGE:
                value = val;
                break;
            case CssTypes.CSS_IDENT:
                if (CssIdent.isCssWide(val.getIdent())) {
                    value = val;
                    break;
                }
                if (getAllowedValue(val.getIdent() )!= null) {
                    value = val;
                    break;
                }
            default:
                throw new InvalidParamException("value",
                        val.toString(),
                        getPropertyName(), ac);
        }
        expression.next();
    }

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