/*
 * Copyright (c) 2012, grossmann, waheckma
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.addons.widgets.office.impl.ole;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

import org.jowidgets.addons.widgets.office.api.IOfficeControl;
import org.jowidgets.addons.widgets.office.api.IOfficeControlSetupBuilder;
import org.jowidgets.addons.widgets.ole.api.IOleAutomation;
import org.jowidgets.addons.widgets.ole.api.IOleControl;
import org.jowidgets.addons.widgets.ole.document.api.IOleDocument;
import org.jowidgets.addons.widgets.ole.document.tools.OleDocumentWrapper;
import org.jowidgets.api.threads.IUiThreadAccess;
import org.jowidgets.api.toolkit.Toolkit;
import org.jowidgets.common.widgets.controller.IFocusListener;
import org.jowidgets.util.concurrent.DaemonThreadFactory;
import org.jowidgets.util.event.ChangeObservable;
import org.jowidgets.util.event.IChangeListener;

final class OfficeControlImpl extends OleDocumentWrapper implements IOfficeControl {

    private static final String COUNT = "Count";
    private static final String VISIBLE = "Visible";
    private static final String COMMAND_BARS = "CommandBars";

    private final ChangeObservable dirtyStateChangeObservable;
    private final ScheduledExecutorService executorService;
    private final DirtyCheckRunnable dirtyCheckRunnable;
    private final int dirtyCheckInterval;
    private final boolean toolbarVisible;

    private ScheduledFuture<?> dirtyCheckSchedule;

    OfficeControlImpl(final IOleDocument oleDocument, final IOfficeControlSetupBuilder<?> setup) {
        super(oleDocument);

        this.dirtyStateChangeObservable = new ChangeObservable();
        this.executorService = Executors.newScheduledThreadPool(1, new DaemonThreadFactory());
        this.toolbarVisible = setup.getToolbarVisible();
        this.dirtyCheckInterval = setup.getDirtyCheckIntervalMs();
        this.dirtyCheckRunnable = new DirtyCheckRunnable();

        oleDocument.addDocumentChangeListener(new DocumenChangetListener());
        oleDocument.getOleControl().addFocusListener(new DirtyListener());

        setToolbarVisibility();
    }

    private void setToolbarVisibility() {
        if (!toolbarVisible) {
            final IOleControl oleControl = getOleControl();
            final IOleAutomation commandBars = oleControl.getAutomation().getProperty(COMMAND_BARS);
            if (commandBars != null) {
                final Integer commandBarsCount = commandBars.getProperty(COUNT);
                if (commandBarsCount != null) {
                    for (int i = 0; i < commandBarsCount.intValue(); i++) {
                        final IOleAutomation commandBar = oleControl.getAutomation().getProperty(COMMAND_BARS, i);
                        if (commandBar != null) {
                            commandBar.setProperty(VISIBLE, toolbarVisible);
                            commandBar.dispose();
                        }
                    }
                }
                commandBars.dispose();
            }
        }
    }

    @Override
    public void addDirtyStateListener(final IChangeListener changeListener) {
        dirtyStateChangeObservable.addChangeListener(changeListener);
    }

    @Override
    public void removeDirtyStateListener(final IChangeListener changeListener) {
        dirtyStateChangeObservable.removeChangeListener(changeListener);
    }

    private class DirtyListener implements IFocusListener {
        @Override
        public void focusGained() {
            startDirtyChecking();
        }

        @Override
        public void focusLost() {
            stopDirtyChecking();
        }
    }

    private void startDirtyChecking() {
        if (dirtyCheckSchedule == null) {
            dirtyCheckSchedule = executorService.scheduleAtFixedRate(
                    dirtyCheckRunnable,
                    0,
                    dirtyCheckInterval,
                    TimeUnit.MILLISECONDS);
        }
    }

    private void stopDirtyChecking() {
        if (dirtyCheckSchedule != null) {
            dirtyCheckSchedule.cancel(true);
            dirtyCheckSchedule = null;
        }
    }

    private final class DirtyCheckRunnable implements Runnable {

        private final IUiThreadAccess uiThreadAccess;
        private boolean currentDirtyState;

        private DirtyCheckRunnable() {
            this.uiThreadAccess = Toolkit.getUiThreadAccess();
            this.currentDirtyState = isDirty();
        }

        @Override
        public void run() {
            uiThreadAccess.invokeLater(new Runnable() {
                @Override
                public void run() {
                    if (isDisposed()) {
                        dirtyCheckSchedule.cancel(true);
                    }
                    else {
                        final boolean newDirtyState = getOleControl().isDirty();
                        if (currentDirtyState != newDirtyState) {
                            currentDirtyState = newDirtyState;
                            dirtyStateChangeObservable.fireChangedEvent();
                        }
                    }
                }
            });
        }
    }

    private class DocumenChangetListener implements IChangeListener {
        @Override
        public void changed() {
            setToolbarVisibility();
        }
    }

}