/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017-2019 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.so.adapters.audit;

import org.camunda.bpm.client.task.ExternalTask;
import org.camunda.bpm.client.task.ExternalTaskService;
import org.onap.logging.ref.slf4j.ONAPLogConstants;
import org.onap.so.audit.beans.AuditInventory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

@Component
public class AuditDeleteStackService {
	
	private static final String UNABLE_TO_FIND_ALL_V_SERVERS_AND_L_INTERACES_IN_A_AI = "All VServers have not been deleted in A&AI";
	
	private static final int[] RETRY_SEQUENCE = new int[] { 1, 1, 2, 3, 5, 8, 13, 20};

	
	private static final Logger logger = LoggerFactory.getLogger(AuditDeleteStackService.class);
	
	@Autowired
	public HeatStackAudit heatStackAudit; 
	
	@Autowired
	public Environment env;

	protected void executeExternalTask(ExternalTask externalTask, ExternalTaskService externalTaskService){
		AuditInventory auditInventory = externalTask.getVariable("auditInventory");
		setupMDC(externalTask);
		boolean success = false;
		try {
			logger.info("Executing External Task Audit Inventory, Retry Number: {} \n {}", auditInventory,externalTask.getRetries());
			success=heatStackAudit.auditHeatStackDeleted(auditInventory.getCloudRegion(), auditInventory.getCloudOwner(),
					auditInventory.getTenantId(), auditInventory.getHeatStackName());
		} catch (Exception e) {
			logger.error("Error during audit of stack", e);
		}
		
		if (success) {
			externalTaskService.complete(externalTask);
			logger.debug("The External Task Id: {}  Successful", externalTask.getId());
		} else {
			if(externalTask.getRetries() == null){
				logger.debug("The External Task Id: {}  Failed, Setting Retries to Default Start Value: {}", externalTask.getId(),RETRY_SEQUENCE.length);
				externalTaskService.handleFailure(externalTask, UNABLE_TO_FIND_ALL_V_SERVERS_AND_L_INTERACES_IN_A_AI, UNABLE_TO_FIND_ALL_V_SERVERS_AND_L_INTERACES_IN_A_AI, RETRY_SEQUENCE.length, 10000);			
			}else if(externalTask.getRetries() != null &&
					externalTask.getRetries()-1 == 0){
				logger.debug("The External Task Id: {}  Failed, All Retries Exhausted", externalTask.getId());
				externalTaskService.complete(externalTask);
			}else{
				logger.debug("The External Task Id: {}  Failed, Decrementing Retries: {} , Retry Delay: ", externalTask.getId(),externalTask.getRetries()-1, calculateRetryDelay(externalTask.getRetries()));
				externalTaskService.handleFailure(externalTask, UNABLE_TO_FIND_ALL_V_SERVERS_AND_L_INTERACES_IN_A_AI, UNABLE_TO_FIND_ALL_V_SERVERS_AND_L_INTERACES_IN_A_AI, externalTask.getRetries()-1, calculateRetryDelay(externalTask.getRetries()));
			}
			logger.debug("The External Task Id: {} Failed", externalTask.getId());
		}
	}
	private void setupMDC(ExternalTask externalTask) {
		String msoRequestId = (String)externalTask.getVariable("mso-request-id");
		if(msoRequestId != null && !msoRequestId.isEmpty())
			MDC.put(ONAPLogConstants.MDCs.REQUEST_ID, msoRequestId);
	}
	protected long calculateRetryDelay(int currentRetries){
		int retrySequence = RETRY_SEQUENCE.length - currentRetries;
		long retryMultiplier = Long.parseLong(env.getProperty("mso.workflow.topics.retryMultiplier","6000"));
		return RETRY_SEQUENCE[retrySequence] * retryMultiplier;
	}
}