/*****************************************************************
 *   Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.
 ****************************************************************/
package org.apache.cayenne.configuration;

import org.apache.cayenne.map.DataMap;
import org.apache.cayenne.resource.Resource;

/**
 * @since 3.1
 */
public class DefaultConfigurationNameMapper implements ConfigurationNameMapper {

	private static final String DEFAULT_NAME = "cayenne";
	private static final String CAYENNE_PREFIX = "cayenne-";
	private static final String CAYENNE_SUFFIX = ".xml";

	private static final String DATA_MAP_SUFFIX = ".map.xml";

	protected ConfigurationNodeVisitor<String> nameMapper;

	public DefaultConfigurationNameMapper() {
		nameMapper = new NameMapper();
	}

	@Override
	public String configurationLocation(ConfigurationNode node) {
		return node.acceptVisitor(nameMapper);
	}

	@Override
	public String configurationLocation(Class<? extends ConfigurationNode> type, String name) {
		if (DataChannelDescriptor.class.isAssignableFrom(type)) {
			return getDataChannelName(name);
		} else if (DataMap.class.isAssignableFrom(type)) {
			return getDataMapName(name);
		}

		throw new IllegalArgumentException("Unrecognized configuration type: " + type.getName());
	}

	@Override
	public String configurationNodeName(Class<? extends ConfigurationNode> type, Resource resource) {

		String path = resource.getURL().getPath();
		if (path == null || path.length() == 0) {
			return null;
		}

		int lastSlash = path.lastIndexOf('/');
		if (lastSlash >= 0) {

			if (lastSlash == path.length() - 1) {
				return null;
			}

			path = path.substring(lastSlash + 1);

		}

		if (DataChannelDescriptor.class.isAssignableFrom(type)) {
			if (!path.startsWith(CAYENNE_PREFIX) || !path.endsWith(CAYENNE_SUFFIX)) {
				// DataChannelDescriptor should always have name
				return DEFAULT_NAME;
			}

			return path.substring(CAYENNE_PREFIX.length(), path.length() - CAYENNE_SUFFIX.length());
		} else if (DataMap.class.isAssignableFrom(type)) {
			if (!path.endsWith(DATA_MAP_SUFFIX)) {
				return null;
			}
			return path.substring(0, path.length() - DATA_MAP_SUFFIX.length());
		}

		throw new IllegalArgumentException("Unrecognized configuration type: " + type.getName());
	}

	protected String getDataChannelName(String name) {
		if (name == null) {
			throw new NullPointerException("Null DataChannelDescriptor name");
		}

		return CAYENNE_PREFIX + name + CAYENNE_SUFFIX;
	}

	protected String getDataMapName(String name) {
		if (name == null) {
			throw new NullPointerException("Null DataMap name");
		}

		return name + DATA_MAP_SUFFIX;
	}

	final class NameMapper extends BaseConfigurationNodeVisitor<String> {

		@Override
		public String visitDataChannelDescriptor(DataChannelDescriptor descriptor) {
			return getDataChannelName(descriptor.getName());
		}

		@Override
		public String visitDataMap(DataMap dataMap) {
			return getDataMapName(dataMap.getName());
		}
	}
}