/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */

package org.libreoffice.report.pentaho.layoutprocessor;

import org.libreoffice.report.pentaho.model.VariablesDeclarationSection;

import org.jfree.report.DataSourceException;
import org.jfree.report.ReportData;
import org.jfree.report.ReportDataFactoryException;
import org.jfree.report.ReportProcessingException;
import org.jfree.report.data.GlobalMasterRow;
import org.jfree.report.data.ReportDataRow;
import org.jfree.report.flow.FlowController;
import org.jfree.report.flow.ReportTarget;
import org.jfree.report.flow.layoutprocessor.ElementLayoutController;
import org.jfree.report.flow.layoutprocessor.LayoutController;
import org.jfree.report.flow.layoutprocessor.SectionLayoutController;

/**
 * Creation-Date: 11.04.2007, 11:04:02
 *
 */
public class OfficeDetailLayoutController extends SectionLayoutController
{

    public static final int STATE_PROCESS_VARIABLES = 2;
    public static final int STATE_PROCESS_NORMAL_FLOW = 3;
    private boolean waitForJoin;
    private int state;

    /**
     * Initializes the layout controller. This method is called exactly once. It
     * is the creators responsibility to call this method.
     *
     * <p>Calling initialize after the first advance must result in a
     * IllegalStateException.</p>
     *
     * @param node           the currently processed object or layout node.
     * @param flowController the current flow controller.
     * @param parent         the parent layout controller that was responsible for
     *                       instantiating this controller.
     * @throws org.jfree.report.DataSourceException
     *          if there was a problem reading data from the datasource.
     * @throws org.jfree.report.ReportProcessingException
     *          if there was a general problem during the report processing.
     * @throws org.jfree.report.ReportDataFactoryException
     *          if a query failed.
     */
    @Override
    public void initialize(final Object node,
            final FlowController flowController,
            final LayoutController parent)
            throws DataSourceException, ReportDataFactoryException,
            ReportProcessingException
    {
        super.initialize(node, flowController, parent);
        state = OfficeDetailLayoutController.STATE_PROCESS_VARIABLES;
    }

    /**
     * This method is called for each newly instantiated layout controller. The returned layout controller instance should
     * have a processing state of either 'OPEN' or 'FINISHING' depending on whether there is any content or any child
     * nodes to process.
     *
     * @param target the report target that receives generated events.
     * @return the new layout controller instance representing the new state.
     * @throws org.jfree.report.DataSourceException
     *          if there was a problem reading data from the datasource.
     * @throws org.jfree.report.ReportProcessingException
     *          if there was a general problem during the report processing.
     * @throws org.jfree.report.ReportDataFactoryException
     *          if a query failed.
     */
    @Override
    protected LayoutController startElement(final ReportTarget target)
            throws DataSourceException, ReportProcessingException, ReportDataFactoryException
    {
        final FlowController fc = getFlowController();
        final GlobalMasterRow masterRow = fc.getMasterRow();
        final ReportDataRow reportDataRow = masterRow.getReportDataRow();
        final ReportData reportData = reportDataRow.getReportData();
        if (!reportData.isReadable())
        {
            reportData.isReadable();
            // If this report has no data, then do not print the detail section. The detail section
            // is the only section that behaves this way, and for now this is only done in the OO-implementation
            final SectionLayoutController derived = (SectionLayoutController) clone();
            derived.setProcessingState(ElementLayoutController.FINISHED);
            derived.setFlowController(fc);
            return derived;
        }

        if (state == OfficeDetailLayoutController.STATE_PROCESS_VARIABLES)
        {
            final VariablesDeclarationSection variables = new VariablesDeclarationSection();
            final OfficeDetailLayoutController controller = (OfficeDetailLayoutController) clone();
            controller.state = OfficeDetailLayoutController.STATE_PROCESS_NORMAL_FLOW;
            controller.waitForJoin = true;
            return processChild(controller, variables, fc);
        }

        return super.startElement(target);
    }

    @Override
    protected void resetSectionForRepeat()
    {
        super.resetSectionForRepeat();
        state = STATE_PROCESS_VARIABLES;
    }

    /**
     * Joins with a delegated process flow. This is generally called from a child
     * flow and should *not* (I mean it!) be called from outside. If you do,
     * you'll suffer.
     *
     * @param flowController the flow controller of the parent.
     * @return the joined layout controller that incorperates all changes from the
     *         delegate.
     */
    @Override
    public LayoutController join(final FlowController flowController)
    {
        if (waitForJoin)
        {
            final OfficeDetailLayoutController derived = (OfficeDetailLayoutController) clone();
            derived.setProcessingState(ElementLayoutController.NOT_STARTED);
            derived.setFlowController(flowController);
            derived.waitForJoin = false;
            return derived;
        }
        return super.join(flowController);
    }
}
