//
// 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-scroll-anchoring-1-20201111/#propdef-overflow-anchor
 */
public class CssOverflowAnchor extends org.w3c.css.properties.css.CssOverflowAnchor {

    public static final CssIdent[] allowed_values;

    static {
        String[] _allowed_values = {"auto", "none"};
        allowed_values = new CssIdent[_allowed_values.length];
        int i = 0;
        for (String s : _allowed_values) {
            allowed_values[i++] = CssIdent.getIdent(s);
        }
    }

    public static CssIdent getAllowedIdent(CssIdent ident) {
        for (CssIdent id : allowed_values) {
            if (id.equals(ident)) {
                return id;
            }
        }
        return null;
    }

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

    /**
     * Create new CssOverflowAnchor
     *
     * @param expression The expression for this property
     * @throws InvalidParamException Values are incorrect
     */
    public CssOverflowAnchor(ApplContext ac, CssExpression expression,
                             boolean check) throws InvalidParamException {
        setByUser();
        CssValue val = expression.getValue();

        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }

        if (val.getType() != CssTypes.CSS_IDENT) {
            throw new InvalidParamException("value",
                    expression.getValue(),
                    getPropertyName(), ac);
        }
        CssIdent id = val.getIdent();
        if (!CssIdent.isCssWide(id) && getAllowedIdent(id) == null) {
            throw new InvalidParamException("value",
                    expression.getValue(),
                    getPropertyName(), ac);
        }
        value = val;
        expression.next();
    }


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

}