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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: [email protected]
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android.samples.db;

import android.content.Context;
import org.solovyev.android.App;
import org.solovyev.android.samples.Locator;

import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

/**
 * User: serso
 * Date: 8/10/12
 * Time: 4:41 PM
 */
public class DbItemServiceImpl implements DbItemService {

	// cached items
	@Nonnull
	private final List items = new ArrayList();

	@Nonnull
	@Override
	public List getAllDbItems(@Nonnull Context context) {
		synchronized (items) {
			if (items.isEmpty()) {
				// assuming: empty => not loaded
				items.addAll(getDbItemDao().loadAll());
			}

			return Collections.unmodifiableList(items);
		}
	}

	@Nonnull
	@Override
	public List getAllStartsWith(@Nonnull String prefix, @Nonnull Context context) {
		final List result;
		synchronized (items) {
			result = new ArrayList(getAllDbItems(context));
		}

		prefix = prefix.toLowerCase();

		// filter by prefix
		for (Iterator it = result.iterator(); it.hasNext(); ) {
			final DbItem notFilteredItem = it.next();
			if (!notFilteredItem.getName().toLowerCase().startsWith(prefix)) {
				it.remove();
			}
		}

		return result;
	}

	@Override
	public void addItem(@Nonnull DbItem dbItem, @Nonnull Context context) {
		synchronized (items) {
			getDbItemDao().insert(dbItem);
			// if successfully insert => add to the cache
			items.add(dbItem);
		}
	}

	@Nonnull
	@Override
	public List removeItemByName(@Nonnull String name, @Nonnull Context context) {
		synchronized (items) {
			final List removedItems = new ArrayList();

			// remove from db
			getDbItemDao().removeByName(name);

			// remove from cache
			for (Iterator it = items.iterator(); it.hasNext(); ) {
				final DbItem dbItem = it.next();
				if (name.equals(dbItem.getName())) {
					it.remove();
					removedItems.add(dbItem);
				}
			}

			return removedItems;
		}
	}

	@Nonnull
	private DbItemDao getDbItemDao() {
		return ((Locator) App.getLocator()).getDbItemDao();
	}
}