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/*-
 * ============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.lang.reflect.Type;
import java.util.Map;

import javax.inject.Singleton;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.openecomp.sdc.be.components.impl.PropertyBusinessLogic;
import org.openecomp.sdc.be.config.BeEcompErrorManager;
import org.openecomp.sdc.be.dao.api.ActionStatus;
import org.openecomp.sdc.be.impl.WebAppContextWrapper;
import org.openecomp.sdc.be.model.DataTypeDefinition;
import org.openecomp.sdc.be.model.PropertyConstraint;
import org.openecomp.sdc.be.model.User;
import org.openecomp.sdc.be.model.operations.impl.PropertyOperation.PropertyConstraintSerialiser;
import org.openecomp.sdc.common.api.Constants;
import org.openecomp.sdc.common.config.EcompErrorName;
import org.openecomp.sdc.common.datastructure.Wrapper;
import org.openecomp.sdc.exception.ResponseFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.WebApplicationContext;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.jcabi.aspects.Loggable;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;

import fj.data.Either;

@Loggable(prepend = true, value = Loggable.DEBUG, trim = false)
@Path("/v1/catalog")
@Api(value = "Types Fetch Servlet", description = "Types Fetch Servlet")
@Singleton
public class TypesFetchServlet extends AbstractValidationsServlet {

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

	@GET
	@Path("dataTypes")
	@Consumes(MediaType.APPLICATION_JSON)
	@Produces(MediaType.APPLICATION_JSON)
	@ApiOperation(value = "Get data types", httpMethod = "GET", notes = "Returns data types", response = Response.class)
	@ApiResponses(value = { @ApiResponse(code = 200, message = "datatypes"), @ApiResponse(code = 403, message = "Restricted operation"), @ApiResponse(code = 400, message = "Invalid content / Missing content"),
			@ApiResponse(code = 404, message = "Data types not found") })
	public Response getAllDataTypesServlet(@Context final HttpServletRequest request, @HeaderParam(value = Constants.USER_ID_HEADER) String userId) {

		Wrapper<Response> responseWrapper = new Wrapper<Response>();
		Wrapper<User> userWrapper = new Wrapper<User>();
		ServletContext context = request.getSession().getServletContext();

		try {
			init(log);
			validateUserExist(responseWrapper, userWrapper, userId);

			if (responseWrapper.isEmpty()) {
				String url = request.getMethod() + " " + request.getRequestURI();
				log.debug("Start handle request of {} | modifier id is {}", url, userId);

				PropertyBusinessLogic businessLogic = getPropertyBL(context);
				Either<Map<String, DataTypeDefinition>, ResponseFormat> allDataTypes = businessLogic.getAllDataTypes();

				if (allDataTypes.isRight()) {
					log.info("Failed to get all dara types. Reason - {}", allDataTypes.right().value());
					Response errorResponse = buildErrorResponse(allDataTypes.right().value());
					responseWrapper.setInnerElement(errorResponse);

					// return buildErrorResponse(allDataTypes.right().value());
				} else {
					
					Map<String, DataTypeDefinition> dataTypes = allDataTypes.left().value();
					String dataTypeJson = gson.toJson(dataTypes);					
					Response okResponse = buildOkResponse(getComponentsUtils().getResponseFormat(ActionStatus.OK), dataTypeJson);					
					responseWrapper.setInnerElement(okResponse);
					
				}
			}

			return responseWrapper.getInnerElement();
		} catch (Exception e) {
			BeEcompErrorManager.getInstance().processEcompError(EcompErrorName.BeRestApiGeneralError, "Get all data types");
			BeEcompErrorManager.getInstance().logBeRestApiGeneralError("Get Property");
			log.debug("get all data types failed with exception", e);
			ResponseFormat responseFormat = getComponentsUtils().getResponseFormat(ActionStatus.GENERAL_ERROR);
			return buildErrorResponse(responseFormat);
		}
	}

	private PropertyBusinessLogic getPropertyBL(ServletContext context) {
		WebAppContextWrapper webApplicationContextWrapper = (WebAppContextWrapper) context.getAttribute(Constants.WEB_APPLICATION_CONTEXT_WRAPPER_ATTR);
		WebApplicationContext webApplicationContext = webApplicationContextWrapper.getWebAppContext(context);
		PropertyBusinessLogic propertytBl = webApplicationContext.getBean(PropertyBusinessLogic.class);
		return propertytBl;
	}

}