/*-
 * ============LICENSE_START=======================================================
 * ONAP - SO
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Modifications Copyright (c) 2019 Samsung
 * ================================================================================
 * 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.bpmn.core.domain;

import java.io.IOException;
import java.io.Serializable;
import java.util.List;
import org.json.JSONException;
import org.json.JSONObject;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Wrapper encapsulates needed JSON functionality to be extended by MSO service decomposition objects providing ways to
 * convert to and from JSON
 *
 */
@JsonInclude(Include.NON_NULL)
public abstract class JsonWrapper implements Serializable {
    private static final String EXCEPTION = "Exception :";

    private static final Logger logger = LoggerFactory.getLogger(JsonWrapper.class);
    private static final ObjectMapper mapper;
    private static final ObjectWriter writer;

    static {
        mapper = new ObjectMapper();
        mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
        mapper.setSerializationInclusion(Include.NON_NULL);
        writer = mapper.writer().withDefaultPrettyPrinter();
    }

    @JsonInclude(Include.NON_NULL)
    public String toJsonString() {

        String jsonString = "";
        try {
            jsonString = writer.writeValueAsString(this);
        } catch (Exception e) {

            logger.debug(EXCEPTION, e);
        }
        return jsonString;
    }

    @JsonInclude(Include.NON_NULL)
    public JSONObject toJsonObject() {
        JSONObject json = new JSONObject();
        try {
            json = new JSONObject(mapper.writeValueAsString(this));
        } catch (JsonGenerationException | JsonMappingException | JSONException e) {
            logger.debug(EXCEPTION, e);
        } catch (IOException e) {
            logger.debug(EXCEPTION, e);
        }
        return json;
    }

    public String listToJson(List<?> list) {
        String jsonString = "";
        try {
            jsonString = mapper.writeValueAsString(list);
        } catch (JsonGenerationException | JsonMappingException e) {
            logger.debug(EXCEPTION, e);
        } catch (IOException e) {
            logger.debug(EXCEPTION, e);
        }
        return jsonString;
    }

    @JsonInclude(Include.NON_NULL)
    public String toJsonStringNoRootName() {

        String jsonString = "";

        try {
            jsonString = writer.writeValueAsString(this);
        } catch (Exception e) {

            logger.debug(EXCEPTION, e);
        }
        return jsonString;
    }

    /**
     * Returns a string representation of this object.
     */
    public String toString() {
        return this.toJsonString();
    }
}