//
// Author: Yves Lafon <ylafon@w3.org>
//
// (c) COPYRIGHT MIT, ERCIM, Keio, Beihang 2015.
// 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.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/2020/WD-css-inline-3-20200827/#propdef-vertical-align
 */
public class CssVerticalAlign extends org.w3c.css.properties.css.CssVerticalAlign {

    public static final CssIdent[] allowed_values;

    static {
        String[] _allowed_values = {"first", "last"};
        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 CssVerticalAlign
     */
    public CssVerticalAlign() {
        value = initial;
    }

    /**
     * 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 CssVerticalAlign(ApplContext ac, CssExpression expression,
                            boolean check) throws InvalidParamException {

        if (check && expression.getCount() > 3) {
            throw new InvalidParamException("unrecognize", ac);
        }

        ArrayList<CssValue> v = new ArrayList<>(3);
        setByUser();
        char op;
        CssValue val;
        CssIdent res;
        boolean got_shift = false;
        boolean got_alignment = false;
        boolean got_baseline_source = false;

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

            switch (val.getType()) {
                case CssTypes.CSS_NUMBER:
                    val.getCheckableValue().checkEqualsZero(ac, this);
                case CssTypes.CSS_LENGTH:
                case CssTypes.CSS_PERCENTAGE:
                    if (got_shift) {
                        throw new InvalidParamException("value", expression.getValue(),
                                getPropertyName(), ac);
                    }
                    got_shift = true;
                    v.add(val);
                    break;
                case CssTypes.CSS_IDENT:
                    CssIdent id = val.getIdent();
                    if (CssIdent.isCssWide(id)) {
                        // inherit can only be alone
                        if (expression.getCount() > 1) {
                            throw new InvalidParamException("value", expression.getValue(),
                                    getPropertyName(), ac);
                        }
                        value = val;
                        break;
                    }
                    if (!got_baseline_source) {
                        res = getAllowedIdent(id);
                        if (res != null) {
                            v.add(val);
                            got_baseline_source = true;
                            break;
                        }
                    }
                    if (!got_shift) {
                        res = CssBaselineShift.getAllowedIdent(id);
                        if (res != null) {
                            v.add(val);
                            got_shift = true;
                            break;
                        }
                    }
                    if (!got_alignment) {
                        res = CssAlignmentBaseline.getAllowedIdent(id);
                        if (res != null) {
                            got_alignment = true;
                            v.add(val);
                            break;
                        }
                    }
                    // failed...
                default:
                    throw new InvalidParamException("value", val,
                            getPropertyName(), ac);
            }
            if (op != CssOperator.SPACE) {
                throw new InvalidParamException("operator",
                        Character.toString(op), ac);
            }
            expression.next();
        }
        if (!v.isEmpty()) {
            value = (v.size() == 1) ? v.get(0) : new CssValueList(v);
        }
    }

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


}