package org.activityinfo.ui.client.page.report;

/*
 * #%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.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.inject.Inject;
import com.google.inject.Provider;
import org.activityinfo.legacy.client.Dispatcher;
import org.activityinfo.ui.client.page.*;

/**
 * Loader for the Report pages
 *
 * @author Alex Bertram
 */
public class ReportLoader implements PageLoader {

    private Provider<ReportsPage> reportsPage;
    private Provider<ReportDesignPage> reportDesignPage;

    @Inject
    public ReportLoader(Dispatcher service,
                        NavigationHandler pageManager,
                        PageStateSerializer placeSerializer,
                        Provider<ReportsPage> reportsPage,
                        Provider<ReportDesignPage> reportDesignPage) {
        this.reportsPage = reportsPage;
        this.reportDesignPage = reportDesignPage;

        pageManager.registerPageLoader(ReportsPage.PAGE_ID, this);
        placeSerializer.registerStatelessPlace(ReportsPage.PAGE_ID, new ReportsPlace());

        pageManager.registerPageLoader(ReportDesignPage.PAGE_ID, this);
        placeSerializer.registerParser(ReportDesignPage.PAGE_ID, new ReportDesignPageState.Parser());
    }

    @Override
    public void load(final PageId pageId, final PageState pageState, final AsyncCallback<Page> callback) {

        GWT.runAsync(new RunAsyncCallback() {
            @Override
            public void onFailure(Throwable reason) {
                callback.onFailure(reason);
            }

            @Override
            public void onSuccess() {
                if (ReportsPage.PAGE_ID.equals(pageId)) {
                    callback.onSuccess(reportsPage.get());

                } else if (ReportDesignPage.PAGE_ID.equals(pageId)) {
                    ReportDesignPage page = reportDesignPage.get();
                    page.navigate(pageState);
                    callback.onSuccess(page);

                } else {
                    GWT.log("ReportLoader received a request it didn't know how to handle: " + pageState.toString(),
                            null);
                }
            }
        });
    }
}