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/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 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.so.client.aai;

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

import javax.ws.rs.core.GenericType;

import org.onap.so.client.RestClient;
import org.onap.so.client.aai.entities.AAIEdgeLabel;
import org.onap.so.client.aai.entities.AAIError;
import org.onap.so.client.aai.entities.singletransaction.OperationBodyRequest;
import org.onap.so.client.aai.entities.singletransaction.OperationBodyResponse;
import org.onap.so.client.aai.entities.singletransaction.SingleTransactionRequest;
import org.onap.so.client.aai.entities.singletransaction.SingleTransactionResponse;
import org.onap.so.client.aai.entities.uri.AAIResourceUri;
import org.onap.so.client.aai.entities.uri.AAIUriFactory;
import org.onap.so.client.graphinventory.GraphInventoryPatchConverter;
import org.onap.so.client.graphinventory.GraphInventoryTransactionClient;
import org.onap.so.client.graphinventory.exceptions.BulkProcessFailed;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Joiner;

public class AAISingleTransactionClient extends GraphInventoryTransactionClient<AAISingleTransactionClient, AAIResourceUri, AAIEdgeLabel> {

	private final SingleTransactionRequest request;
	private AAIResourcesClient resourcesClient;
	private AAIClient aaiClient;
	protected AAISingleTransactionClient(AAIResourcesClient resourcesClient, AAIClient aaiClient) {
		super();
		this.resourcesClient = resourcesClient;
		this.aaiClient = aaiClient;
		this.request = new SingleTransactionRequest();
	}
	
	/* (non-Javadoc)
	 * @see org.onap.so.client.aai.GraphInventoryTransactionClient#execute()
	 */
	@Override
	public void execute() throws BulkProcessFailed {
		RestClient client = aaiClient.createClient(AAIUriFactory.createResourceUri(AAIObjectType.SINGLE_TRANSACTION));
		try {
			SingleTransactionResponse response = client.post(this.request, SingleTransactionResponse.class);
			if (response != null) {
				final Optional<String> errorMessage = this.locateErrorMessages(response);
				if (errorMessage.isPresent()) {
					throw new BulkProcessFailed("One or more transactions failed in A&AI. Check logs for payloads.\nMessages:\n" + errorMessage.get());
				}
			} else {
				throw new BulkProcessFailed("Transactions acccepted by A&AI, but there was no response. Unsure of result.");
			}
		} finally {
			this.request.getOperations().clear();
			this.actionCount = 0;
		}
	}

	protected Optional<String> locateErrorMessages(SingleTransactionResponse response) {
		final List<String> errorMessages = new ArrayList<>();
		final ObjectMapper mapper = new ObjectMapper();
		
		for (OperationBodyResponse body : response.getOperationResponses()) {
			if (Optional.ofNullable(body.getResponseStatusCode()).orElse(400) > 300) {
				AAIError error;
				try {
					error = mapper.readValue(mapper.writeValueAsString(body.getResponseBody()), AAIError.class);
				} catch (IOException e) {
					logger.error("could not parse error object from A&AI", e);
					error = new AAIError();
				}
				AAIErrorFormatter formatter = new AAIErrorFormatter(error);
				String outputMessage = formatter.getMessage();
				errorMessages.add(outputMessage);
			}
		}
		
		if (!errorMessages.isEmpty()) {
			return Optional.of(Joiner.on("\n").join(errorMessages));
		} else {
			return Optional.empty();
		}
	}

	
	protected SingleTransactionRequest getRequest() {
		return this.request;
	}

	@Override
	public void put(String uri, Object body) {
		request.getOperations().add(new OperationBodyRequest().withAction("put").withUri(uri).withBody(body));
	}

	@Override
	public void delete(String uri, Object body) {
		request.getOperations().add(new OperationBodyRequest().withAction("delete").withUri(uri).withBody(body));
	}

	@Override
	public void patch(String uri, Object body) {
		request.getOperations().add(new OperationBodyRequest().withAction("patch").withUri(uri).withBody(body));
	}

	@Override
	protected <T> Optional<T> get(GenericType<T> genericType, AAIResourceUri clone) {
		return resourcesClient.get(genericType, clone);
	}
	
	@Override
	protected boolean exists(AAIResourceUri uri) {
		return resourcesClient.exists(uri);
	}
	
	@Override
	protected String getGraphDBName() {
		return aaiClient.getGraphDBName();
	}
	
	@Override
	protected GraphInventoryPatchConverter getPatchConverter() {
		return this.patchConverter;
	}
}