/*
 * Copyright (c) 2011, grossmann
 * 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.spi.impl.swt.common.widgets;

import java.io.File;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
import org.jowidgets.common.types.DialogResult;
import org.jowidgets.common.types.FileChooserType;
import org.jowidgets.common.types.IFileChooserFilter;
import org.jowidgets.spi.widgets.IFileChooserSpi;
import org.jowidgets.spi.widgets.setup.IFileChooserSetupSpi;
import org.jowidgets.util.Assert;

public class FileChooserImpl implements IFileChooserSpi {

    private static final String WILD_CARD = "*.";

    private final FileDialog fileDialog;
    private final ArrayList<IFileChooserFilter> filterList;

    public FileChooserImpl(final Object parentUiReference, final IFileChooserSetupSpi setup) {
        fileDialog = new FileDialog((Shell) parentUiReference, getStyle(setup));
        if (setup.getTitle() != null) {
            fileDialog.setText(setup.getTitle());
        }

        if (setup.getFilterList() != null) {
            this.filterList = new ArrayList<IFileChooserFilter>(setup.getFilterList());
            final String[] filterNames = new String[filterList.size()];
            final String[] filterExtensions = new String[filterList.size()];

            int index = 0;
            for (final IFileChooserFilter filter : filterList) {
                filterNames[index] = filter.getFilterName();
                final StringBuilder extensions = new StringBuilder();
                for (final String extension : filter.getExtensions()) {
                    extensions.append(WILD_CARD + extension + ";");
                }
                if (filter.getExtensions().size() > 0) {
                    extensions.replace(extensions.length() - 1, extensions.length(), "");
                }
                filterExtensions[index] = extensions.toString();
                index++;
            }

            fileDialog.setFilterNames(filterNames);
            fileDialog.setFilterExtensions(filterExtensions);
        }
        else {
            this.filterList = new ArrayList<IFileChooserFilter>();
        }
    }

    @Override
    public Object getUiReference() {
        return fileDialog;
    }

    @Override
    public void setSelectedFile(final File file) {
        Assert.paramNotNull(file, "file");
        fileDialog.setFileName(file.getAbsolutePath());
    }

    @Override
    public DialogResult open() {
        final String result = fileDialog.open();
        if (result != null) {
            return DialogResult.OK;
        }
        else {
            return DialogResult.CANCEL;
        }
    }

    @Override
    public List<File> getSelectedFiles() {
        final List<File> result = new LinkedList<File>();
        for (final String fileName : fileDialog.getFileNames()) {
            final String filterPath = fileDialog.getFilterPath();
            if (filterPath != null && !filterPath.trim().isEmpty()) {
                final File path = new File(filterPath);
                result.add(new File(path, fileName));
            }
            else {
                result.add(new File(fileName));
            }
        }
        return result;
    }

    @Override
    public IFileChooserFilter getSelectedFilter() {
        final int filterIndex = fileDialog.getFilterIndex();
        if (filterIndex != -1) {
            return filterList.get(filterIndex);
        }
        else {
            return null;
        }
    }

    @Override
    public void setEnabled(final boolean enabled) {
        if (!enabled) {
            throw new IllegalArgumentException("Can not disable a file chooser");
        }
    }

    @Override
    public boolean isEnabled() {
        return true;
    }

    private static int getStyle(final IFileChooserSetupSpi setup) {
        int result = SWT.NONE;
        if (setup.getType() == FileChooserType.SAVE) {
            result = result | SWT.SAVE;
        }
        if (setup.getType() == FileChooserType.OPEN_FILE) {
            result = result | SWT.OPEN;
        }
        if (setup.getType() == FileChooserType.OPEN_FILE_LIST) {
            result = result | SWT.OPEN | SWT.MULTI;
        }
        return result;
    }
}