// $Id$
// @author Yves Lafon <ylafon@w3.org>

// (c) COPYRIGHT MIT, ERCIM and Keio University, 2012.
// Please first read the full copyright statement in file COPYRIGHT.html
package org.w3c.css.properties.css3;

import org.w3c.css.properties.css.CssProperty;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.InvalidParamException;
import org.w3c.css.values.CssCheckableValue;
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/2021/CRD-css-backgrounds-3-20210726/#propdef-border-width
 */
public class CssBorderWidth extends org.w3c.css.properties.css.CssBorderWidth {


    public static final CssIdent[] allowed_values;

    static {
        String[] _allowed_values = {"thin", "medium", "thick"};
        int i = 0;
        allowed_values = new CssIdent[_allowed_values.length];
        for (String s : _allowed_values) {
            allowed_values[i++] = CssIdent.getIdent(s);
        }
    }

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

    /**
     * Create a new CssBorderWidth
     */
    public CssBorderWidth() {
        value = initial;
        top = new CssBorderTopWidth();
        right = new CssBorderRightWidth();
        bottom = new CssBorderBottomWidth();
        left = new CssBorderLeftWidth();
    }

    /**
     * Set the value of the property<br/>
     * Does not check the number of values
     *
     * @param expression The expression for this property
     * @throws org.w3c.css.util.InvalidParamException The expression is incorrect
     */
    public CssBorderWidth(ApplContext ac, CssExpression expression)
            throws InvalidParamException {
        this(ac, expression, false);
    }

    /**
     * Set the value of the property
     *
     * @param expression The expression for this property
     * @param check      set it to true to check the number of values
     * @throws org.w3c.css.util.InvalidParamException The expression is incorrect
     */
    public CssBorderWidth(ApplContext ac, CssExpression expression,
                          boolean check) throws InvalidParamException {
        if (check && expression.getCount() > 4) {
            throw new InvalidParamException("unrecognize", ac);
        }
        setByUser();
        CssValue val;
        char op;
        boolean gotCssWide = false;

        ArrayList<CssValue> res = new ArrayList<CssValue>();
        while (res.size() < 4 && !expression.end()) {
            val = expression.getValue();
            op = expression.getOperator();

            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getCheckableValue().checkEqualsZero(ac, this);
                    res.add(val);
                    break;
                case CssTypes.CSS_LENGTH:
                    CssCheckableValue length = val.getCheckableValue();
                    length.checkPositiveness(ac, this);
                    res.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    CssIdent id = val.getIdent();
                    if (CssIdent.isCssWide(id)) {
                        gotCssWide = true;
                        res.add(id);
                        value = val;
                        break;
                    }
                    if (getAllowedIdent(id) == null) {
                        throw new InvalidParamException("value", val,
                                getPropertyName(), ac);
                    }
                    res.add(val);
                    break;
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            expression.next();
            if (op != SPACE) {
                throw new InvalidParamException("operator",
                        Character.toString(op),
                        ac);
            }
        }
        // check that inherit is alone
        if (res.size() > 1 && gotCssWide) {
            throw new InvalidParamException("value", value,
                    getPropertyName(), ac);
        }
        value = (res.size() == 1) ? res.get(0) : new CssValueList(res);

        // now assign the computed values...
        top = new CssBorderTopWidth();
        right = new CssBorderRightWidth();
        bottom = new CssBorderBottomWidth();
        left = new CssBorderLeftWidth();

        switch (res.size()) {
            case 1:
                top.value = left.value = right.value = bottom.value = res.get(0);
                break;
            case 2:
                top.value = bottom.value = res.get(0);
                right.value = left.value = res.get(1);
                break;
            case 3:
                top.value = res.get(0);
                right.value = left.value = res.get(1);
                bottom.value = res.get(2);
                break;
            case 4:
                top.value = res.get(0);
                right.value = res.get(1);
                bottom.value = res.get(2);
                left.value = res.get(3);
                break;
            default:
                // can't happen
                throw new InvalidParamException("unrecognize", ac);
        }
        shorthand = true;
    }


    /**
     * Check the border-*-width and returns a value.
     * It makes sense to do it only once for all the sides, so by having the code here.
     */
    protected static CssValue parseBorderSideWidth(ApplContext ac, CssExpression expression,
                                                   boolean check, CssProperty caller)
            throws InvalidParamException {
        if (check && expression.getCount() > 1) {
            throw new InvalidParamException("unrecognize", ac);
        }
        CssValue retval = null;
        CssValue val = expression.getValue();
        switch (val.getType()) {
            case CssTypes.CSS_NUMBER:
                val.getCheckableValue().checkEqualsZero(ac, caller);
                retval = val;
                break;
            case CssTypes.CSS_LENGTH:
                CssCheckableValue length = val.getCheckableValue();
                length.checkPositiveness(ac, caller);
                retval = val;
                break;
            case CssTypes.CSS_IDENT:
                CssIdent id = val.getIdent();
                if (CssIdent.isCssWide(id) || getAllowedIdent(id) != null) {
                    retval = val;
                    break;
                }
                // else fail
            default:
                throw new InvalidParamException("value", expression.getValue(),
                        caller.getPropertyName(), ac);
        }
        expression.next();
        return retval;
    }
}