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/********************************************************************************
 * Copyright (c) 2022 Imixs Software Solutions GmbH and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/
package org.openbpmn.bpmn.util;

import org.openbpmn.bpmn.BPMNModel;
import org.openbpmn.bpmn.elements.Event;
import org.openbpmn.bpmn.elements.Gateway;
import org.openbpmn.bpmn.elements.core.BPMNElementNode;
import org.openbpmn.bpmn.elements.core.BPMNLabel;
import org.openbpmn.bpmn.exceptions.BPMNMissingElementException;

/**
 * The BPMNModelUtil provides helper methods for a BPMNModel and the XML
 * representation of a model.
 * 
 * @author rsoika
 *
 */
public class BPMNModelUtil {

    /**
     * This method resets the Label Postion and bounds to its default values. The
     * method is used in cases where no bounds are set or in case the postion should
     * be reset to the default position of a label. This will also reflect to the
     * source model, if the model will be saved later by the user...
     * 
     * @throws BPMNMissingElementException
     */
    public static void resetLabelBounds(final BPMNElementNode flowElement) throws BPMNMissingElementException {
        double x = 0;
        double y = 0;
        if (BPMNModel.isGateway(flowElement)) {
            // gateway dimensions...
            x = flowElement.getBounds().getPosition().getX() + (Gateway.DEFAULT_WIDTH / 2)
                    - (BPMNLabel.DEFAULT_WIDTH / 2);
            y = flowElement.getBounds().getPosition().getY() + Gateway.DEFAULT_HEIGHT + Gateway.LABEL_OFFSET;
        } else {
            // default (events)
            x = flowElement.getBounds().getPosition().getX() + (Event.DEFAULT_WIDTH / 2)
                    - (BPMNLabel.DEFAULT_WIDTH / 2);
            y = flowElement.getBounds().getPosition().getY() + Event.DEFAULT_HEIGHT + Event.LABEL_OFFSET;
        }

        // update source model with default width/height!
        flowElement.getLabel().getBounds().setPosition(x, y);
        // update source model with default width/height!
        flowElement.getLabel().getBounds().setDimension(BPMNLabel.DEFAULT_WIDTH, BPMNLabel.DEFAULT_HEIGHT);
    }

    /**
     * This method removes whitespace around CDATA Tags like:
     * 
     * 
     * 
     * 
     * 
     * results in:
     * 
     * 
     * 
     * We can not use regex (replaceAll) here
     * 
     * xmlString =
     * xmlString.replaceAll(">\\s*+(<\\!\\[CDATA\\[(.|\\n|\\r\\n)*?]\\]>)\\s*$1'
            int backwardTagPos = xml.lastIndexOf(">", pos);
            // do we have whitespace?
            if (pos > backwardTagPos - 1) {
                xml = xml.substring(0, backwardTagPos + 1) + xml.substring(pos);
            }
            lastPos = backwardTagPos + 9;
            /**
             * next search for
             * CDATA end ']]>'
             */
            pos = xml.indexOf("]]>", lastPos);
            if (pos == -1) {
                // wrong CDATA!
                System.out.println("WRONG CDATA ELEMENT - unexpected end at: " + lastPos);
                completed = true;
                break;
            }
            pos = pos + 3;
            // find upper '>'
            int forwardTagPos = xml.indexOf("<", pos);
            // do we have whitespace?
            if (forwardTagPos > pos) {
                xml = xml.substring(0, pos) + xml.substring(forwardTagPos);
            }
            lastPos = pos + 1;
        }

        return xml;
    }

}