package com.commafeed.backend.dao;

import java.util.List;
import java.util.Set;

import javax.ejb.Stateless;
import javax.inject.Inject;

import com.commafeed.backend.model.Feed;
import com.commafeed.backend.model.FeedCategory;
import com.commafeed.backend.model.FeedEntry;
import com.commafeed.backend.model.FeedEntryStatus;
import com.commafeed.backend.model.FeedSubscription;
import com.commafeed.backend.model.User;
import com.commafeed.frontend.utils.ModelFactory.MF;
import com.google.api.client.util.Lists;
import com.google.common.collect.Iterables;
import com.uaihebert.factory.EasyCriteriaFactory;
import com.uaihebert.model.EasyCriteria;

@Stateless
@SuppressWarnings("serial")
public class FeedSubscriptionService extends GenericDAO<FeedSubscription> {

	@Inject
	FeedCategoryService feedCategoryService;

	@Inject
	FeedService feedService;

	@Inject
	FeedEntryStatusService feedEntryStatusService;

	public void subscribe(User user, String url, String title,
			FeedCategory category) {

		Feed feed = feedService.findByUrl(url);
		if (feed == null) {
			feed = new Feed();
			feed.setUrl(url);
			feedService.save(feed);
		}

		FeedSubscription sub = findByFeed(user, feed);
		if (sub == null) {
			sub = new FeedSubscription();
			sub.setFeed(feed);
			sub.setUser(user);
		}
		sub.setCategory(category);
		sub.setTitle(title);
		saveOrUpdate(sub);

		List<FeedEntryStatus> statuses = Lists.newArrayList();
		Set<FeedEntry> allEntries = feedService
				.getByIdWithEntries(feed.getId()).getEntries();
		for (FeedEntry entry : allEntries) {
			FeedEntryStatus status = new FeedEntryStatus();
			status.setEntry(entry);
			status.setRead(true);
			status.setSubscription(sub);
			statuses.add(status);
		}
		feedEntryStatusService.save(statuses);
	}

	public FeedSubscription findById(User user, Long id) {
		EasyCriteria<FeedSubscription> criteria = createCriteria();
		criteria.andEquals(MF.i(proxy().getUser()), user);
		criteria.andEquals(MF.i(proxy().getId()), id);
		return Iterables.getFirst(criteria.getResultList(), null);
	}

	public List<FeedSubscription> findByFeed(Feed feed) {
		EasyCriteria<FeedSubscription> criteria = createCriteria();
		criteria.andEquals(MF.i(proxy().getFeed()), feed);
		return criteria.getResultList();
	}

	public FeedSubscription findByFeed(User user, Feed feed) {
		EasyCriteria<FeedSubscription> criteria = createCriteria();
		criteria.andEquals(MF.i(proxy().getUser()), user);
		criteria.andEquals(MF.i(proxy().getFeed()), feed);
		return Iterables.getFirst(criteria.getResultList(), null);
	}

	public List<FeedSubscription> findAll(User user) {
		EasyCriteria<FeedSubscription> criteria = createCriteria();
		criteria.andEquals(MF.i(proxy().getUser()), user);

		criteria.innerJoinFetch(MF.i(proxy().getFeed()));
		criteria.innerJoinFetch(MF.i(proxy().getUser()));
		criteria.leftJoinFetch(MF.i(proxy().getCategory()));
		return criteria.getResultList();
	}

	public List<FeedSubscription> findWithoutCategories(User user) {
		EasyCriteria<FeedSubscription> criteria = EasyCriteriaFactory
				.createQueryCriteria(em, getType());
		criteria.andEquals(MF.i(proxy().getUser()), user);
		criteria.andIsNull(MF.i(proxy().getCategory()));
		return criteria.getResultList();

	}
}