//
// 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-area
 */
public class CssGridArea extends org.w3c.css.properties.css.CssGridArea {

    private CssGridRowStart _row_start;
    private CssGridRowEnd _row_end;
    private CssGridColumnStart _col_start;
    private CssGridColumnEnd _col_end;

    /**
     * Create a new CssGridArea
     */
    public CssGridArea() {
        value = initial;
        _row_start = new CssGridRowStart();
        _row_end = new CssGridRowEnd();
        _col_start = new CssGridColumnStart();
        _col_end = new CssGridColumnEnd();

    }

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

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

        _row_start = new CssGridRowStart();
        _row_end = new CssGridRowEnd();
        _col_start = new CssGridColumnStart();
        _col_end = new CssGridColumnEnd();

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

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

            if (val.getType() == CssTypes.CSS_SWITCH) {
                if (nb_switch > 2) {
                    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);
        // the following is not entirely true (as we need to check that the value is
        // a custom ident), but we just need to warn for a redefinition here.
        _row_start.value = values.get(0);
        _col_start.value = (values.size() == 1) ? CssGridRowStart.auto : values.get(2);
        _row_end.value = (values.size() <= 3) ? CssGridRowStart.auto : values.get(4);
        _col_end.value = (values.size() <= 5) ? CssGridRowStart.auto : values.get(6);


    }

    public CssGridArea(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);
        _row_start.addToStyle(ac, style);
        _row_end.addToStyle(ac, style);
        _col_start.addToStyle(ac, style);
        _col_end.addToStyle(ac, style);
    }

}