//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang, 2017.
// 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;
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-auto-flow
 */
public class CssGridAutoFlow extends org.w3c.css.properties.css.CssGridAutoFlow {

    public static final CssIdent[] allowed_values;
    public static final CssIdent dense = CssIdent.getIdent("dense");
    public static final CssIdent row;
    public static final CssIdent column;


    static {
        row = CssIdent.getIdent("row");
        column = CssIdent.getIdent("column");
        allowed_values = new CssIdent[]{row, column};
    }

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

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

    /**
     * Creates a new CssGridAutoFlow
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException
     *          Expressions are incorrect
     */
    public CssGridAutoFlow(ApplContext ac, CssExpression expression, boolean check)
            throws InvalidParamException {
        if (check && expression.getCount() > 2) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();

        CssValue val;
        char op;


        boolean got_axis = false;
        ArrayList<CssValue> values = new ArrayList<>();

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

            switch (val.getType()) {
                case CssTypes.CSS_IDENT:
                    CssIdent id = val.getIdent();
                    if (CssIdent.isCssWide(id)) {
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("unrecognize", ac);
                        }
                        values.add(val);
                        break;
                    }
                    if (getAllowedIdent(id) != null) {
                        if (got_axis) {
                            throw new InvalidParamException("value",
                                    val.toString(),
                                    getPropertyName(), ac);
                        } else {
                            got_axis = true;
                            values.add(val);
                            break;
                        }
                    }
                    if (dense.equals(id)) {
                        // did we get another 'dense' ?
                        if (values.size() > 0 && !got_axis) {
                            throw new InvalidParamException("value",
                                    val.toString(),
                                    getPropertyName(), ac);
                        }
                        values.add(val);
                        break;
                    }
                default:
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
            }
            if (op != SPACE) {
                throw new InvalidParamException("operator", op,
                        getPropertyName(), ac);
            }
            expression.next();
        }
        value = (values.size() == 1) ? values.get(0) : new CssValueList(values);
    }

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

}