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/*
 *  ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one or more
 *    contributor license agreements.  See the NOTICE file distributed with
 *    this work for additional information regarding copyright ownership.
 *    The ASF licenses this file to You under the Apache License, Version 2.0
 *    (the "License"); you may not use this file except in compliance with
 *    the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 * ====================================================================
 */

package org.apache.poi.xslf.model;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamReader;

import org.apache.poi.xslf.usermodel.XSLFShape;
import org.apache.xmlbeans.XmlException;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraph;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTextParagraphProperties;

public abstract class ParagraphPropertyFetcher extends PropertyFetcher {
    static final String PML_NS = "http://schemas.openxmlformats.org/presentationml/2006/main";
    static final String DML_NS = "http://schemas.openxmlformats.org/drawingml/2006/main";

    private static final QName[] TX_BODY = { new QName(PML_NS, "txBody") };
    private static final QName[] LST_STYLE = { new QName(DML_NS, "lstStyle") };

    int _level;

    public ParagraphPropertyFetcher(int level) {
        _level = level;
    }

    public boolean fetch(XSLFShape shape) {
        QName[] lvlProp = { new QName(DML_NS, "lvl" + (_level + 1) + "pPr") };
        CTTextParagraphProperties props = null;
        try {
            props = shape.selectProperty(
                    CTTextParagraphProperties.class, ParagraphPropertyFetcher::parse, TX_BODY, LST_STYLE, lvlProp);
            return (props != null) && fetch(props);
        } catch (XmlException e) {
            return false;
        }
    }

    private static CTTextParagraphProperties parse(XMLStreamReader reader) throws XmlException {
        CTTextParagraph para = CTTextParagraph.Factory.parse(reader);
        return (para != null && para.isSetPPr()) ? para.getPPr() : null;
    }

    public abstract boolean fetch(CTTextParagraphProperties props);
}