/*-
 * ============LICENSE_START=======================================================
 * openECOMP : APP-C
 * ================================================================================
 * 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.appc.dg.common.utils;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;
import java.io.Reader;
import java.util.*;


public class JSONUtil {

    private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();

    public static <T> T fromJson(String json, Class<T> clazz) {

        try {
            return OBJECT_MAPPER.readValue(json, clazz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T fromJson(Reader reader, Class<T> clazz) {

        try {
            return OBJECT_MAPPER.readValue(reader, clazz);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static String toJson(Object object) {

        try {
            return OBJECT_MAPPER.writeValueAsString(object);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static Map<String,String> extractPlainValues(String json, String ... names) {
        if (null == names) return Collections.emptyMap();
        Map<String,String> values = new HashMap<>();
        try {
            final JsonNode jsonNode = OBJECT_MAPPER.readTree(json);
            for (String name : names) {
                values.put(name, jsonNode.path(name).asText());
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return values;
    }




}