/*-
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2019 Nordix Foundation.
 * ================================================================================
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.so.adapters.vnfmadapter.extclients.vnfm;

import com.google.common.base.Optional;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.CreateVnfRequest;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.InlineResponse200;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.InlineResponse2001;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.InlineResponse201;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.InstantiateVnfRequest;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.LccnSubscriptionRequest;
import org.onap.so.adapters.vnfmadapter.extclients.vnfm.model.TerminateVnfRequest;
import org.onap.so.adapters.vnfmadapter.rest.exceptions.VnfmRequestFailureException;
import org.onap.so.rest.service.HttpRestServiceProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;

@Service
public class VnfmServiceProviderImpl implements VnfmServiceProvider {
    private static final Logger logger = LoggerFactory.getLogger(VnfmServiceProviderImpl.class);

    private final HttpRestServiceProvider httpServiceProvider;
    private final VnfmUrlProvider urlProvider;

    @Autowired
    public VnfmServiceProviderImpl(final VnfmUrlProvider urlProvider,
            @Qualifier("vnfmServiceProvider") final HttpRestServiceProvider httpServiceProvider) {
        this.httpServiceProvider = httpServiceProvider;
        this.urlProvider = urlProvider;
    }

    @Override
    public Optional<InlineResponse201> getVnf(final String vnfSelfLink) {
        return httpServiceProvider.get(vnfSelfLink, InlineResponse201.class);
    }

    @Override
    public String instantiateVnf(final String vnfSelfLink, final InstantiateVnfRequest instantiateVnfRequest) {
        logger.debug("Sending instantiate request " + instantiateVnfRequest + " to : " + vnfSelfLink);

        ResponseEntity<Void> response = null;
        try {
            response = httpServiceProvider.postHttpRequest(instantiateVnfRequest, vnfSelfLink + "/instantiate",
                    Void.class);
        } catch (final Exception exception) {
            final String errorMessage =
                    "Instantiate request to " + vnfSelfLink + " resulted in exception" + instantiateVnfRequest;
            logger.error(errorMessage, exception);
            throw new VnfmRequestFailureException(errorMessage, exception);
        }
        if (response.getStatusCode() != HttpStatus.ACCEPTED) {
            final String errorMessage = "Instantiate request to " + vnfSelfLink + " returned status code: "
                    + response.getStatusCode() + ", request: " + instantiateVnfRequest;
            logger.error(errorMessage);
            throw new VnfmRequestFailureException(errorMessage);
        }
        final String locationHeader = response.getHeaders().get("Location").iterator().next();
        return locationHeader.substring(locationHeader.lastIndexOf("/") + 1);
    }

    @Override
    public InlineResponse2001 subscribeForNotifications(final String vnfmId,
            final LccnSubscriptionRequest subscriptionRequest) {
        logger.info("Subscribing for notifications {}", subscriptionRequest);
        final String url = urlProvider.getSubscriptionsUrl(vnfmId);
        ResponseEntity<InlineResponse2001> response = null;
        try {
            response = httpServiceProvider.postHttpRequest(subscriptionRequest, url, InlineResponse2001.class);
            logger.info("Subscribing for notifications response {}", response);
        } catch (final Exception exception) {
            final String errorMessage =
                    "Subscription to VNFM " + vnfmId + " resulted in exception" + subscriptionRequest;
            logger.error(errorMessage, exception);
            throw new VnfmRequestFailureException(errorMessage, exception);
        }
        if (response.getStatusCode() != HttpStatus.OK) {
            final String errorMessage = "Subscription to VNFM " + vnfmId + " returned status code: "
                    + response.getStatusCode() + ", request: " + subscriptionRequest;
            logger.error(errorMessage);
            throw new VnfmRequestFailureException(errorMessage);
        }
        return response.getBody();
    }

    @Override
    public String terminateVnf(final String vnfSelfLink, final TerminateVnfRequest terminateVnfRequest) {
        logger.debug("Sending terminate request " + terminateVnfRequest + " to : " + vnfSelfLink);

        ResponseEntity<Void> response = null;
        try {
            response = httpServiceProvider.postHttpRequest(terminateVnfRequest, vnfSelfLink + "/terminate", Void.class);
        } catch (final Exception exception) {
            final String errorMessage =
                    "Terminate request to " + vnfSelfLink + " resulted in exception" + terminateVnfRequest;
            logger.error(errorMessage, exception);
            throw new VnfmRequestFailureException(errorMessage, exception);
        }
        if (response.getStatusCode() != HttpStatus.ACCEPTED) {
            final String errorMessage = "Terminate request to " + vnfSelfLink + " returned status code: "
                    + response.getStatusCode() + ", request: " + terminateVnfRequest;
            logger.error(errorMessage);
            throw new VnfmRequestFailureException(errorMessage);
        }
        final String locationHeader = response.getHeaders().get("Location").iterator().next();
        return locationHeader.substring(locationHeader.lastIndexOf("/") + 1);

    }

    @Override
    public void deleteVnf(final String vnfSelfLink) {
        logger.debug("Sending delete request to : " + vnfSelfLink);
        final ResponseEntity<Void> response = httpServiceProvider.deleteHttpRequest(vnfSelfLink, Void.class);
        if (response.getStatusCode() != HttpStatus.OK) {
            throw new VnfmRequestFailureException(
                    "Delete request to " + vnfSelfLink + " return status code: " + response.getStatusCode());
        }
    }

    @Override
    public Optional<InlineResponse200> getOperation(final String vnfmId, final String operationId) {
        final String url = urlProvider.getOperationUrl(vnfmId, operationId);
        return httpServiceProvider.get(url, InlineResponse200.class);
    }

    @Override
    public Optional<InlineResponse201> createVnf(final String vnfmId, final CreateVnfRequest createVnfRequest) {
        final String url = urlProvider.getCreationUrl(vnfmId);
        logger.debug("Sending create request {} to : {}", createVnfRequest, url);
        try {
            return httpServiceProvider.post(createVnfRequest, url, InlineResponse201.class);
        } catch (final Exception exception) {
            final String errorMessage =
                    "Create request to vnfm:" + vnfmId + " resulted in exception" + createVnfRequest;
            logger.error(errorMessage, exception);
            throw new VnfmRequestFailureException(errorMessage, exception);
        }
    }

}