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/*
 * Copyright 2013 Jeanfrancois Arcand
 *
 * 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.
 */
package org.atmosphere.util;

import org.atmosphere.util.uri.UriTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Map;

/**
 * Default implementation of the {@link EndpointMapper} used by the {@link org.atmosphere.cpr.AsynchronousProcessor}
 * and {@link org.atmosphere.websocket.DefaultWebSocketProcessor}
 *
 * @author Jeanfrancois Arcand
 */
public class DefaultEndpointMapper implements EndpointMapper {
    
    private static final Logger logger = LoggerFactory.getLogger(DefaultEndpointMapper.class);

    public DefaultEndpointMapper() {
    }

    protected U match(String path, Map handlers) {
        U handler = handlers.get(path);

        if (handler == null) {
            final Map m = new HashMap();
            for (Map.Entry e : handlers.entrySet()) {
                UriTemplate t = new UriTemplate(e.getKey());
                logger.trace("Trying to map {} to {}", t, path);
                if (t.match(path, m)) {
                    handler = e.getValue();
                    logger.trace("Mapped {} to {}", t, e.getValue());
                    break;
                }
            }
        }
        return handler;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public U map(String path, Map handlers) {

        if (path == null || path.isEmpty()) {
            path = "/";
        }

        U handler = match(path + (path.endsWith("/") ? "all" : "/all"), handlers);
        if (handler == null) {
            // (2) First, try exact match
            handler = match(path, handlers);

            if (handler == null) {
                // (3) Wildcard
                handler = match(path + "*", handlers);

                // (4) try without a path
                if (handler == null) {
                    String p = path.lastIndexOf("/") <= 0 ? "/" : path.substring(0, path.lastIndexOf("/"));
                    while (p.length() > 0 && p.indexOf("/") != -1) {
                        handler = match(p, handlers);

                        // (3.1) Try path wildcard
                        if (handler != null) {
                            break;
                        }
                        p = p.substring(0, p.lastIndexOf("/"));
                    }
                }
            }
        }
        return handler;
    }
}