/*
 *  ====================================================================
 *    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.xssf.usermodel;

import javax.xml.namespace.QName;

import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.util.Internal;
import org.apache.xmlbeans.XmlCursor;
import org.openxmlformats.schemas.drawingml.x2006.main.CTGraphicalObjectData;
import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps;
import org.openxmlformats.schemas.drawingml.x2006.main.CTPoint2D;
import org.openxmlformats.schemas.drawingml.x2006.main.CTPositiveSize2D;
import org.openxmlformats.schemas.drawingml.x2006.main.CTShapeProperties;
import org.openxmlformats.schemas.drawingml.x2006.main.CTTransform2D;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTGraphicalObjectFrame;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTGraphicalObjectFrameNonVisual;
import org.openxmlformats.schemas.officeDocument.x2006.relationships.STRelationshipId;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Represents DrawingML GraphicalObjectFrame.
 */
public final class XSSFGraphicFrame extends XSSFShape {

    private static CTGraphicalObjectFrame prototype;

    private final CTGraphicalObjectFrame graphicFrame;

    /**
     * Construct a new XSSFGraphicFrame object.
     *
     * @param drawing the XSSFDrawing that owns this frame
     * @param ctGraphicFrame the XML bean that stores this frame content
     */
    protected XSSFGraphicFrame(XSSFDrawing drawing, CTGraphicalObjectFrame ctGraphicFrame) {
        this.drawing = drawing; // protected field on XSSFShape
        this.graphicFrame = ctGraphicFrame;

        // TODO: there may be a better way to delegate this
        CTGraphicalObjectData graphicData = graphicFrame.getGraphic() == null ?
                null : graphicFrame.getGraphic().getGraphicData();
        if (graphicData != null) {
            NodeList nodes = graphicData.getDomNode().getChildNodes();
            for (int i = 0; i < nodes.getLength(); i++) {
                final Node node = nodes.item(i);
                // if the frame references a chart, associate the chart with this instance
                if (node.getNodeName().equals("c:chart")) {
                    // this better succeed or the document is invalid
                    POIXMLDocumentPart relation = drawing.getRelationById(node.getAttributes().getNamedItem("r:id").getNodeValue());
                    // Do XWPF charts need similar treatment?
                    if (relation instanceof XSSFChart) {
                        ((XSSFChart) relation).setGraphicFrame(this);
                    }
                }
            }
        }
    }

    @Internal
    public CTGraphicalObjectFrame getCTGraphicalObjectFrame() {
        return graphicFrame;
    }

    /**
     * Initialize default structure of a new graphic frame
     */
    protected static CTGraphicalObjectFrame prototype() {
        if (prototype == null) {
            CTGraphicalObjectFrame graphicFrame = CTGraphicalObjectFrame.Factory.newInstance();

            CTGraphicalObjectFrameNonVisual nvGraphic = graphicFrame.addNewNvGraphicFramePr();
            CTNonVisualDrawingProps props = nvGraphic.addNewCNvPr();
            props.setId(0);
            props.setName("Diagramm 1");
            nvGraphic.addNewCNvGraphicFramePr();

            CTTransform2D transform = graphicFrame.addNewXfrm();
            CTPositiveSize2D extPoint = transform.addNewExt();
            CTPoint2D offPoint = transform.addNewOff();

            extPoint.setCx(0);
            extPoint.setCy(0);
            offPoint.setX(0);
            offPoint.setY(0);

            /* CTGraphicalObject graphic = */ graphicFrame.addNewGraphic();

            prototype = graphicFrame;
        }
        return prototype;
    }

    /**
     * Sets the frame macro.
     */
    public void setMacro(String macro) {
        graphicFrame.setMacro(macro);
    }

    /**
     * Sets the frame name.
     */
    public void setName(String name) {
        getNonVisualProperties().setName(name);
    }

    /**
     * Returns the frame name.
     * @return name of the frame
     */
    public String getName() {
        return getNonVisualProperties().getName();
    }

    private CTNonVisualDrawingProps getNonVisualProperties() {
        CTGraphicalObjectFrameNonVisual nvGraphic = graphicFrame.getNvGraphicFramePr();
        return nvGraphic.getCNvPr();
    }

    /**
     * Attaches frame to an anchor.
     */
    protected void setAnchor(XSSFClientAnchor anchor) {
        this.anchor = anchor;
    }

    /**
     * Returns the frame anchor.
     * @return the XSSFClientAnchor anchor this frame is attached to
     */
    @Override
    public XSSFClientAnchor getAnchor() {
        return (XSSFClientAnchor) anchor;
    }

    /**
     * Assign a DrawingML chart to the graphic frame.
     */
    protected void setChart(XSSFChart chart, String relId) {
        CTGraphicalObjectData data = graphicFrame.getGraphic().addNewGraphicData();
        appendChartElement(data, relId);
        chart.setGraphicFrame(this);
    }

    /**
     * Gets the frame id.
     */
    public long getId() {
        return graphicFrame.getNvGraphicFramePr().getCNvPr().getId();
    }

    /**
     * Sets the frame id.
     */
    protected void setId(long id) {
        graphicFrame.getNvGraphicFramePr().getCNvPr().setId(id);
    }

    /**
     * The low level code to insert {@code <c:chart>} tag into
     * {@code <a:graphicData>}.
     *
     * Here is the schema (ECMA-376):
     * <pre>
     * {@code
     * <complexType name="CT_GraphicalObjectData">
     *   <sequence>
     *     <any minOccurs="0" maxOccurs="unbounded" processContents="strict"/>
     *   </sequence>
     *   <attribute name="uri" type="xsd:token"/>
     * </complexType>
     * }
     * </pre>
     */
    private void appendChartElement(CTGraphicalObjectData data, String id) {
        String r_namespaceUri = STRelationshipId.type.getName().getNamespaceURI();
        String c_namespaceUri = XSSFDrawing.NAMESPACE_C;
        try (XmlCursor cursor = data.newCursor()) {
            cursor.toNextToken();
            cursor.beginElement(new QName(c_namespaceUri, "chart", "c"));
            cursor.insertAttributeWithValue(new QName(r_namespaceUri, "id", "r"), id);
        }
        data.setUri(c_namespaceUri);
    }

    @Override
    protected CTShapeProperties getShapeProperties(){
        return null;
    }

    @Override
    public String getShapeName() {
        return graphicFrame.getNvGraphicFramePr().getCNvPr().getName();
    }
}