//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2016.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

import org.w3c.css.parser.CssStyle;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssExpression;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

import static org.w3c.css.values.CssOperator.SPACE;

/**
 * @spec https://www.w3.org/TR/2020/CRD-css-grid-1-20201218/#propdef-grid-column
 */
public class CssGridColumn extends org.w3c.css.properties.css.CssGridColumn {

    private CssGridRowStart _start;
    private CssGridRowEnd _end;

    /**
     * Create a new CssGridColumn
     */
    public CssGridColumn() {
        value = initial;
        _start = new CssGridRowStart();
        _end = new CssGridRowEnd();
    }

    /**
     * Creates a new CssGridColumn
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssGridColumn(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        CssExpression exp;

        CssValue val;
        char op;
        exp = new CssExpression();
        int nb_switch = 0;

        _start = new CssGridRowStart();
        _end = new CssGridRowEnd();

        ArrayList<CssValue> values = new ArrayList<>();

        while (!expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();

            if (val.getType() == CssTypes.CSS_SWITCH) {
                if (nb_switch > 0) {
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
                }
                values.add(CssGridRowStart.checkGridLine(ac, exp, check, this));
                values.add(val);
                exp = new CssExpression();
                nb_switch++;
            } else {
                exp.addValue(val);
            }
            if (op != SPACE) {
                throw new InvalidParamException("operator", op,
                        getPropertyName(), ac);
            }
            expression.next();
        }
        values.add(CssGridRowStart.checkGridLine(ac, exp, check, this));

        value = (values.size() == 1) ? values.get(0) : new CssValueList(values);
        _start.value = values.get(0);
        _end.value = (values.size() == 1) ? CssGridRowStart.auto : values.get(2);
    }

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

    /**
     * Add this property to the CssStyle.
     *
     * @param style The CssStyle
     */
    public void addToStyle(ApplContext ac, CssStyle style) {
        super.addToStyle(ac, style);
        _start.addToStyle(ac, style);
        _end.addToStyle(ac, style);
    }

}

