/**
 * Copyright 2017 ZTE Corporation.
 *
 * 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.
 */
package org.onap.workflow.activitiext.restservicetask;

import java.util.Map.Entry;

import org.activiti.engine.delegate.DelegateExecution;
import org.onap.workflow.activitiext.common.ConstString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;

public class GsonUtil {
	
	private static final Logger logger = LoggerFactory.getLogger(GsonUtil.class);
	
	public static JsonObject formatJsonObject(String key, JsonObject obj, DelegateExecution execution) {

		JsonObject res = new JsonObject();
		
		for (Entry<String, JsonElement> entry : obj.entrySet()) {
			
			if (entry.getValue() instanceof JsonObject) {
				
				JsonObject tempObj = (JsonObject) entry.getValue();
				JsonElement valueSource = tempObj.get(ConstString.PARAMETER_VALUESOURCE);
				if(valueSource == null || valueSource.getAsString().equals(ConstString.PARAMETER_VALUE_SOURCE_DEFINITION))
				{
					res.add(entry.getKey(), formatJsonObject(entry.getKey(), entry.getValue().getAsJsonObject(), execution));
				}else{
					res.addProperty(entry.getKey(), getValue(tempObj, execution));
				}

			} else if (entry.getValue() instanceof JsonArray) {

				JsonArray objArray = entry.getValue().getAsJsonArray();
				JsonArray resArray = formatJsonArray(objArray, execution);
				res.add(entry.getKey(), resArray);
			}
		}

		return res;
	}

	public static JsonArray formatJsonArray(JsonArray objArray, DelegateExecution execution) {

		JsonArray array = new JsonArray();

		for (JsonElement element : objArray) {

			if (element.isJsonObject()) {
				
				JsonObject tempObj = (JsonObject) element;
				JsonElement valueSource = tempObj.get(ConstString.PARAMETER_VALUESOURCE);
				if(valueSource == null || valueSource.getAsString().equals(ConstString.PARAMETER_VALUE_SOURCE_DEFINITION))
				{
					array.add(formatJsonObject(null, element.getAsJsonObject(), execution));
				}else{
					array.add(new JsonPrimitive(getValue(tempObj, execution)));
				}
				
			} else if (element.isJsonArray()) {

				array = formatJsonArray(element.getAsJsonArray(), execution);
			}
		}

		return array;
	}

	/**
	 * obtain jsonObject value
	 * @param obj
	 * @param execution
	 * @return
	 */
	public static String getValue(JsonObject obj, DelegateExecution execution)
	{
		String result = new String();
		try {
			String valueSource = obj.get(ConstString.PARAMETER_VALUESOURCE).getAsString();
			String value = obj.get(ConstString.PARAMETER_VALUE).getAsString();
			if(ConstString.PARAMETER_VALUE_SOURCE_STRING.equals(valueSource))
			{
				result = value;
			}else if(ConstString.PARAMETER_VALUE_SOURCE_PLAN.equals(valueSource))
			{
				result = HttpUtil.parsePlanExpression(value, execution);
			}else if(ConstString.PARAMETER_VALUE_SOURCE_TOPOLOGY.equals(valueSource))
			{
				result = HttpUtil.parseTopologyExpression(value, execution);
			}
		} catch (Exception e) {
			logger.error("jsonObject {} is illegal!", obj.toString(), e);
			throw e;
		}
		
		return result;
	}
}