/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.aai.schemaservice.interceptors.pre;

import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.annotation.Priority;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.PreMatching;
import javax.ws.rs.core.MultivaluedMap;

import org.onap.aai.schemaservice.interceptors.AAIContainerFilter;
import org.onap.aai.schemaservice.interceptors.AAIHeaderProperties;

@PreMatching
@Priority(AAIRequestFilterPriority.HEADER_MANIPULATION)
public class RequestHeaderManipulation extends AAIContainerFilter
    implements ContainerRequestFilter {

    public static final Pattern EXTRACT_VERSION_PATTERN = Pattern.compile("^(v[1-9][0-9]*).*$");

    @Override
    public void filter(ContainerRequestContext requestContext) {

        String uri = requestContext.getUriInfo().getPath();
        this.addRequestContext(uri, requestContext.getHeaders());

    }

    private void addRequestContext(String uri, MultivaluedMap<String, String> requestHeaders) {

        String rc = "";

        Matcher match = EXTRACT_VERSION_PATTERN.matcher(uri);
        if (match.find()) {
            rc = match.group(1);
        }

        if (requestHeaders.containsKey(AAIHeaderProperties.REQUEST_CONTEXT)) {
            requestHeaders.remove(AAIHeaderProperties.REQUEST_CONTEXT);
        }
        requestHeaders.put(AAIHeaderProperties.REQUEST_CONTEXT, Collections.singletonList(rc));
    }

}