/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * 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.openecomp.sdc.be.servlets;

import java.io.IOException;

import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig.Feature;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.openecomp.sdc.be.model.ArtifactDefinition;
import org.openecomp.sdc.common.api.ArtifactGroupTypeEnum;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.common.config.EcompErrorName;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

public class RepresentationUtils {

	private static Logger log = LoggerFactory.getLogger(RepresentationUtils.class.getName());

	public static ArtifactDefinition convertJsonToArtifactDefinitionForUpdate(String content, Class<ArtifactDefinition> clazz) {

		JsonObject jsonElement = new JsonObject();
		ArtifactDefinition resourceInfo = null;

		try {
			Gson gson = new Gson();
			jsonElement = gson.fromJson(content, jsonElement.getClass());
			String payload = null;
			jsonElement.remove(Constants.ARTIFACT_GROUP_TYPE_FIELD);
			//in update the group type is ignored but this spagheti code makes it too complex to remove this field.
			jsonElement.addProperty(Constants.ARTIFACT_GROUP_TYPE_FIELD, ArtifactGroupTypeEnum.INFORMATIONAL.getType());
			JsonElement artifactPayload = jsonElement.get(Constants.ARTIFACT_PAYLOAD_DATA);
			if (artifactPayload != null && !artifactPayload.isJsonNull()) {
				payload = artifactPayload.getAsString();
			}
			jsonElement.remove(Constants.ARTIFACT_PAYLOAD_DATA);
			String json = gson.toJson(jsonElement);
			ObjectMapper mapper = new ObjectMapper();
			mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
			mapper.configure(Feature.FAIL_ON_EMPTY_BEANS, false);
			mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);

			resourceInfo = mapper.readValue(json, clazz);
			resourceInfo.setPayloadData(payload);

		} catch (Exception e) {
			BeEcompErrorManager.getInstance().processEcompError(EcompErrorName.BeArtifactInformationInvalidError, "Artifact Upload / Update");
			BeEcompErrorManager.getInstance().logBeArtifactInformationInvalidError("Artifact Upload / Update");
			log.debug("Failed to convert the content {} to object.", content.substring(0, Math.min(50, content.length())), e);
		}

		return resourceInfo;
	}


	public static class ResourceRep {

	}

	/**
	 * Build Representation of given Object
	 * 
	 * @param elementToRepresent
	 * @return
	 * @throws IOException
	 * @throws JsonGenerationException
	 * @throws JsonMappingException
	 */
	public static <T> Object toRepresentation(T elementToRepresent) throws IOException, JsonGenerationException, JsonMappingException {

		// return theResource;
		ObjectMapper mapper = new ObjectMapper();
		mapper.configure(Feature.FAIL_ON_EMPTY_BEANS, false);
		mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
		return mapper.writeValueAsString(elementToRepresent);
	}

	public static <T> T fromRepresentation(String json, Class<T> clazz) {
		ObjectMapper mapper = new ObjectMapper();
		T object = null;
		mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
		mapper.configure(Feature.FAIL_ON_EMPTY_BEANS, false);
		mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
		try {
			object = mapper.readValue(json, clazz);
		} catch (Exception e) {
			log.error("Error when parsing JSON of object of type {}", clazz.getSimpleName(), e);
		} // return null in case of exception

		return object;
	}

	public static ArtifactDefinition convertJsonToArtifactDefinition(String content, Class<ArtifactDefinition> clazz) {

		JsonObject jsonElement = new JsonObject();
		ArtifactDefinition resourceInfo = null;
		
		try {
			Gson gson = new Gson();
			jsonElement = gson.fromJson(content, jsonElement.getClass());
			JsonElement artifactGroupValue = jsonElement.get(Constants.ARTIFACT_GROUP_TYPE_FIELD);
			if (artifactGroupValue != null && !artifactGroupValue.isJsonNull()) {
				String groupValueUpper = artifactGroupValue.getAsString().toUpperCase();
				if (!ArtifactGroupTypeEnum.getAllTypes().contains(groupValueUpper)) {
					StringBuilder sb = new StringBuilder();
					for (String value : ArtifactGroupTypeEnum.getAllTypes()) {
						sb.append(value).append(", ");
					}
					log.debug("artifactGroupType is {}. valid values are: {}", groupValueUpper, sb.toString());
					return null;
				} else {
					jsonElement.remove(Constants.ARTIFACT_GROUP_TYPE_FIELD);
					jsonElement.addProperty(Constants.ARTIFACT_GROUP_TYPE_FIELD, groupValueUpper);
				}
			}
			String payload = null;
			JsonElement artifactPayload = jsonElement.get(Constants.ARTIFACT_PAYLOAD_DATA);
			if (artifactPayload != null && !artifactPayload.isJsonNull()) {
				payload = artifactPayload.getAsString();
			}
			jsonElement.remove(Constants.ARTIFACT_PAYLOAD_DATA);
			String json = gson.toJson(jsonElement);
			ObjectMapper mapper = new ObjectMapper();
			mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
			mapper.configure(Feature.FAIL_ON_EMPTY_BEANS, false);
			mapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
			
			resourceInfo = mapper.readValue(json, clazz);
			resourceInfo.setPayloadData(payload);

		} catch (Exception e) {
			BeEcompErrorManager.getInstance().processEcompError(EcompErrorName.BeArtifactInformationInvalidError, "Artifact Upload / Update");
			BeEcompErrorManager.getInstance().logBeArtifactInformationInvalidError("Artifact Upload / Update");
			log.debug("Failed to convert the content {} to object.", content.substring(0, Math.min(50, content.length())), e);
		}

		return resourceInfo;
	}

}