package org.activityinfo.ui.client.component.report.editor.map.symbols;

/*
 * #%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.common.collect.Maps;
import com.google.gwt.http.client.*;
import com.google.gwt.user.client.rpc.AsyncCallback;

import java.util.Map;

public final class AdminGeometryProvider {

    public static final AdminGeometryProvider INSTANCE = new AdminGeometryProvider();

    private Map<Integer, AdminGeometry> cache = Maps.newHashMap();

    public void fetch(final int levelId, final AsyncCallback<AdminGeometry> callback) {
        if (cache.containsKey(levelId)) {
            callback.onSuccess(cache.get(levelId));
        } else {
            fetchGeometry(levelId, callback);
        }
    }

    private void fetchGeometry(final int levelId, final AsyncCallback<AdminGeometry> callback) {
        RequestBuilder request = new RequestBuilder(RequestBuilder.GET,
                "/resources/adminLevel/" + levelId + "/entities/polylines");
        request.setCallback(new RequestCallback() {

            @Override
            public void onResponseReceived(Request request, Response response) {
                try {
                    AdminGeometry geometry = AdminGeometry.fromJson(response.getText());
                    cache.put(levelId, geometry);
                    callback.onSuccess(geometry);
                } catch (Exception e) {
                    callback.onFailure(e);
                }
            }

            @Override
            public void onError(Request request, Throwable exception) {
                callback.onFailure(exception);
            }
        });
        try {
            request.send();
        } catch (RequestException e) {
            callback.onFailure(e);
        }
    }
}