package org.activityinfo.ui.client.local.capability;

/*
 * #%L
 * ActivityInfo Server
 * %%
 * Copyright (C) 2009 - 2013 UNICEF
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import com.bedatadriven.rebar.appcache.client.AppCache;
import com.bedatadriven.rebar.appcache.client.AppCache.Status;
import com.bedatadriven.rebar.appcache.client.AppCacheFactory;
import com.google.gwt.user.client.rpc.AsyncCallback;

/**
 * FireFox offline capability profile.
 * <p/>
 * <p/>
 * Though Mozilla has decided not to implement WebSQL, we use a add-on to expose
 * the sqlite database service Mozilla provides for extensions.
 */
public class FFCapabilityProfile extends LocalCapabilityProfile {

    private boolean hasPlugin;

    public FFCapabilityProfile() {
        hasPlugin = hasPlugin();
    }

    @Override
    public boolean isOfflineModeSupported() {
        return hasPlugin;
    }

    @Override
    public void acquirePermission(final AsyncCallback<Void> callback) {

        final AppCache appCache = AppCacheFactory.get();
        if (appCache.getStatus() != Status.UNCACHED) {
            callback.onSuccess(null);
        } else {
            FFPermissionsDialog dialog = new FFPermissionsDialog(callback);
            dialog.show();
        }
    }

    @Override
    public String getInstallInstructions() {
        return ProfileResources.INSTANCE.startupMessageFirefox().getText();
    }

    private static native boolean hasPlugin() /*-{
      return !!$wnd.openDatabase;
    }-*/;

}