/**
 * ============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.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

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.MediaType;
import javax.ws.rs.core.Response;

import org.onap.aai.exceptions.AAIException;
import org.onap.aai.logging.ErrorLogHelper;
import org.onap.aai.schemaservice.interceptors.AAIContainerFilter;
import org.onap.aai.schemaservice.interceptors.AAIHeaderProperties;
import org.onap.logging.filter.base.Constants;
import org.onap.logging.ref.slf4j.ONAPLogConstants;

@PreMatching
@Priority(AAIRequestFilterPriority.HEADER_VALIDATION)
public class HeaderValidation extends AAIContainerFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {

        Optional<Response> oResp;

        List<MediaType> acceptHeaderValues = requestContext.getAcceptableMediaTypes();
        String fromAppId = getPartnerName(requestContext);
        oResp = this.validateHeaderValuePresence(fromAppId, "AAI_4009", acceptHeaderValues);
        if (oResp.isPresent()) {
            requestContext.abortWith(oResp.get());
            return;
        }
        String transId = getRequestId(requestContext);
        oResp = this.validateHeaderValuePresence(transId, "AAI_4010", acceptHeaderValues);
        if (oResp.isPresent()) {
            requestContext.abortWith(oResp.get());
            return;
        }
    }

    private Optional<Response> validateHeaderValuePresence(String value, String errorCode,
        List<MediaType> acceptHeaderValues) {
        Response response = null;
        AAIException aaie;
        if (value == null || value.isEmpty()) {
            aaie = new AAIException(errorCode);
            return Optional
                .of(Response
                    .status(aaie.getErrorObject().getHTTPResponseCode()).entity(ErrorLogHelper
                        .getRESTAPIErrorResponse(acceptHeaderValues, aaie, new ArrayList<>()))
                    .build());
        }

        return Optional.ofNullable(response);
    }

    public String getRequestId(ContainerRequestContext requestContext) {
        String requestId = requestContext.getHeaderString(ONAPLogConstants.Headers.REQUEST_ID);
        if (requestId == null || requestId.isEmpty()) {
            requestId = requestContext.getHeaderString(Constants.HttpHeaders.HEADER_REQUEST_ID);
            if (requestId == null || requestId.isEmpty()) {
                requestId = requestContext.getHeaderString(Constants.HttpHeaders.TRANSACTION_ID);
                if (requestId == null || requestId.isEmpty()) {
                    requestId =
                        requestContext.getHeaderString(Constants.HttpHeaders.ECOMP_REQUEST_ID);
                    if (requestId == null || requestId.isEmpty()) {
                        return requestId;
                    }
                }
            }
        }
        if (requestContext.getHeaders().get(ONAPLogConstants.Headers.REQUEST_ID) != null) {
            requestContext.getHeaders().get(ONAPLogConstants.Headers.REQUEST_ID).clear();
        }
        if (requestContext.getHeaders().get(Constants.HttpHeaders.TRANSACTION_ID) != null) {
            requestContext.getHeaders().get(Constants.HttpHeaders.TRANSACTION_ID).clear();
        }
        if (requestContext.getHeaders().get(Constants.HttpHeaders.HEADER_REQUEST_ID) != null) {
            requestContext.getHeaders().get(Constants.HttpHeaders.HEADER_REQUEST_ID).clear();
        }
        if (requestContext.getHeaders().get(Constants.HttpHeaders.ECOMP_REQUEST_ID) != null) {
            requestContext.getHeaders().get(Constants.HttpHeaders.ECOMP_REQUEST_ID).clear();
        }
        requestContext.getHeaders().add(Constants.HttpHeaders.TRANSACTION_ID, requestId);

        return requestId;
    }

    public String getPartnerName(ContainerRequestContext requestContext) {
        String partnerName = requestContext.getHeaderString(ONAPLogConstants.Headers.PARTNER_NAME);
        if (partnerName == null || (partnerName.isEmpty())) {
            partnerName = requestContext.getHeaderString(AAIHeaderProperties.FROM_APP_ID);
            if (partnerName == null || (partnerName.isEmpty())) {
                return partnerName;
            }
        }
        if (requestContext.getHeaders().get(ONAPLogConstants.Headers.PARTNER_NAME) != null) {
            requestContext.getHeaders().get(ONAPLogConstants.Headers.PARTNER_NAME).clear();
        }
        if (requestContext.getHeaders().get(AAIHeaderProperties.FROM_APP_ID) != null) {
            requestContext.getHeaders().get(AAIHeaderProperties.FROM_APP_ID).clear();
        }
        requestContext.getHeaders().add(AAIHeaderProperties.FROM_APP_ID, partnerName);
        return partnerName;
    }
}