package org.skylight1.neny;



import static com.google.appengine.api.memcache.jsr107cache.GCacheFactory.EXPIRATION_DELTA;



import java.io.IOException;

import java.util.Calendar;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.logging.Logger;



import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import net.sf.jsr107cache.Cache;

import net.sf.jsr107cache.CacheFactory;

import net.sf.jsr107cache.CacheManager;



import org.skylight1.neny.model.Restaurant;

import org.skylight1.neny.server.RestaurantDAO;



import com.google.gson.Gson;



@SuppressWarnings("serial")

public class NewRestaurantsServlet extends HttpServlet {



	private static final int ONE_DAY = 24 * 60 * 60;



	private static final Logger LOGGER = Logger.getLogger(NewRestaurantsServlet.class.getName());



	@SuppressWarnings("unchecked")

	public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

		try {

			LOGGER.info("starting");



			resp.setContentType("application/json");

			final Calendar calendar = Calendar.getInstance();

			calendar.add(Calendar.MONTH, -3);

			calendar.set(Calendar.HOUR_OF_DAY, 0);

			calendar.clear(Calendar.MINUTE);

			calendar.clear(Calendar.SECOND);

			calendar.clear(Calendar.MILLISECOND);



			final Date cutoffDate = calendar.getTime();

			final List<Restaurant> listOfRestaurants;



			final CacheFactory cacheFactory = CacheManager.getInstance().getCacheFactory();

			final Map<Object, Object> properties = new HashMap<Object, Object>();

			properties.put(EXPIRATION_DELTA, ONE_DAY);

			final Cache cache = cacheFactory.createCache(properties);



			LOGGER.info("cache key is " + cutoffDate);

			if (cache.containsKey(cutoffDate)) {

				listOfRestaurants = (List<Restaurant>) cache.get(cutoffDate);

				LOGGER.info("found in cache; list length = " + listOfRestaurants.size());

			} else {

				listOfRestaurants = new RestaurantDAO().getListOfRestaurants(cutoffDate);

				cache.put(cutoffDate, listOfRestaurants);

				LOGGER.info("did not find in cache, so retrieved from database and stored in cache; list length = " + listOfRestaurants.size());

			}



			new Gson().toJson(listOfRestaurants, resp.getWriter());



			LOGGER.info("done");

		} catch (Exception e) {

			throw new IOException(e);

		}

	}

}