//
// 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.CssIdent;
import org.w3c.css.values.CssOperator;
import org.w3c.css.values.CssTypes;
import org.w3c.css.values.CssValue;
import org.w3c.css.values.CssValueList;

import java.util.ArrayList;

/**
 * @spec https://www.w3.org/TR/2018/CR-css-flexbox-1-20181119/#propdef-flex-flow
 */
public class CssFlexFlow extends org.w3c.css.properties.css.CssFlexFlow {

    private CssFlexDirection flexDirection;
    private CssFlexWrap flexWrap;

    /**
     * Create a new CssFlexFlow
     */
    public CssFlexFlow() {
        value = initial;
        flexDirection = new CssFlexDirection();
        flexWrap = new CssFlexWrap();
    }

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

        CssValue directionVal = null;
        CssValue wrapVal = null;
        CssValue val;
        char op;

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

            switch (val.getType()) {
                case CssTypes.CSS_IDENT:
                    CssIdent ident = val.getIdent();
                    if (CssIdent.isCssWide(ident)) {
                        value = val;
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("value",
                                    val.toString(),
                                    getPropertyName(), ac);
                        }
                        break;
                    }
                    if (directionVal == null) {
                        if (CssFlexDirection.getAllowedIdent(ident) != null) {
                            directionVal = val;
                            break;
                        }
                    }
                    if (wrapVal == null) {
                        if (CssFlexWrap.getAllowedIdent(ident) != null) {
                            wrapVal = val;
                            break;
                        }
                    }
                default:
                    throw new InvalidParamException("value",
                            val.toString(),
                            getPropertyName(), ac);
            }
            if (op != CssOperator.SPACE) {
                throw new InvalidParamException("operator",
                        Character.toString(op), ac);
            }
            expression.next();
        }
        // for addToStyle, redefinitions and equality check
        flexDirection = new CssFlexDirection();
        flexWrap = new CssFlexWrap();
        if (wrapVal == null && directionVal == null) {
            // css-wide ident
            flexDirection.value = value;
            flexWrap.value = value;
        } else {
            ArrayList<CssValue> v = new ArrayList<>();
            if (directionVal != null) {
                v.add(directionVal);
                flexDirection.value = directionVal;
            }
            if (wrapVal != null) {
                v.add(wrapVal);
                flexWrap.value = wrapVal;
            }
            value = (v.size() == 1) ? v.get(0) : new CssValueList(v);
        }
    }

    public CssFlexFlow(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);
        flexDirection.addToStyle(ac, style);
        flexWrap.addToStyle(ac, style);
    }
}