/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 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.client.policy;

import java.io.IOException;
import java.util.List;

import org.onap.so.client.RestClient;
import org.onap.so.client.RestPropertiesLoader;
import org.onap.so.client.defaultproperties.PolicyRestPropertiesImpl;
import org.onap.so.client.policy.entities.AllowedTreatments;
import org.onap.so.client.policy.entities.Bbid;
import org.onap.so.client.policy.entities.Config;
import org.onap.so.client.policy.entities.ConfigRequestParameters;
import org.onap.so.client.policy.entities.DecisionAttributes;
import org.onap.so.client.policy.entities.DictionaryData;
import org.onap.so.client.policy.entities.DictionaryItemsRequest;
import org.onap.so.client.policy.entities.DictionaryJson;
import org.onap.so.client.policy.entities.PolicyConfig;
import org.onap.so.client.policy.entities.PolicyDecision;
import org.onap.so.client.policy.entities.PolicyDecisionRequest;
import org.onap.so.client.policy.entities.PolicyServiceType;
import org.onap.so.client.policy.entities.Workstep;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;


public class PolicyClientImpl implements PolicyClient {

	private static Logger logger = LoggerFactory.getLogger(PolicyClientImpl.class);
	private PolicyRestProperties props;
	private ObjectMapper mapper = new ObjectMapper();
	
	public PolicyClientImpl() {
		props = RestPropertiesLoader.getInstance().getNewImpl(PolicyRestProperties.class);
		if (props == null) {
			logger.error("No RestProperty.PolicyRestProperties implementation found on classpath");
			props = new PolicyRestPropertiesImpl();
		}
	}
	public PolicyDecision getDecision(String serviceType, String vnfType, String bbID, String workStep,
			String errorCode) {
		DecisionAttributes decisionAttributes = new DecisionAttributes();
		decisionAttributes.setServiceType(serviceType);
		decisionAttributes.setvNFType(vnfType);
		decisionAttributes.setBbID(bbID);
		decisionAttributes.setWorkStep(workStep);
		decisionAttributes.setErrorCode(errorCode);

		return this.getDecision(decisionAttributes);
	}

	protected PolicyDecision getDecision(DecisionAttributes decisionAttributes) {
		PolicyRestClient client = this.getPolicyRestClient(PolicyServiceType.GET_DECISION);
		PolicyDecisionRequest decisionRequest = new PolicyDecisionRequest();
		decisionRequest.setDecisionAttributes(decisionAttributes);
		decisionRequest.setEcompcomponentName(RestClient.ECOMP_COMPONENT_NAME);
		
		return client.post(decisionRequest, PolicyDecision.class);
	}
	
	public DictionaryData getAllowedTreatments(String bbID, String workStep)
	{
		PolicyRestClient client = this.getPolicyRestClient(PolicyServiceType.GET_DICTIONARY_ITEMS);
		DictionaryItemsRequest dictionaryItemsRequest = new DictionaryItemsRequest();
		dictionaryItemsRequest.setDictionaryType("Decision");
		dictionaryItemsRequest.setDictionary("RainyDayTreatments");
		final AllowedTreatments response = client.post(dictionaryItemsRequest, AllowedTreatments.class);
		final DictionaryJson dictionaryJson = response.getDictionaryJson();
		final List<DictionaryData> dictionaryDataList = dictionaryJson.getDictionaryDatas();
		for(DictionaryData dictData : dictionaryDataList){
			Bbid bBid = dictData.getBbid();
			Workstep workstep = dictData.getWorkstep();
			String bBidString = bBid.getString();
			String workstepString = workstep.getString();
			if(bbID.equals(bBidString) && workStep.equals(workstepString)){
				return dictData;
			}
		}
		logger.error("There is no AllowedTreatments with that specified parameter set");
		return null;
	}
	
	@Override
	public Config getConfigWithPolicyName(String policyName) {
		PolicyRestClient client = this.getPolicyRestClient(PolicyServiceType.GET_CONFIG);
		ConfigRequestParameters configReqParameters = new ConfigRequestParameters();
		configReqParameters.setPolicyName(policyName);
		PolicyConfig[] policyConfigList = client.post(configReqParameters, PolicyConfig[].class);
		PolicyConfig policyConfig = null;
		if(policyConfigList.length > 1) {
			logger.debug("Too many configs for policyName: " + policyName);
			return null;
		}
		try {
			policyConfig = policyConfigList[0];
			return this.getConfigFromStringJson(policyConfig.getConfig());
		} catch (IOException e) {
			logger.error(e.getMessage());
			return null;
		}
	}
	
	protected Config getConfigFromStringJson(String configJson) throws JsonParseException, JsonMappingException, IOException {
		String unescapedJson = configJson.replaceAll("\\\\", "");
		mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, false);
		mapper.configure(DeserializationFeature.UNWRAP_ROOT_VALUE, false);
		return mapper.readValue(unescapedJson, Config.class);
	}
	
	protected PolicyRestClient getPolicyRestClient(PolicyServiceType policyServiceType) {
		return new PolicyRestClient(this.props, policyServiceType);
	}
}