/*-
 * ============LICENSE_START=======================================================
 * org.openecomp.aai
 * ================================================================================
 * 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.aai.ajsc_aai.filemonitor;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.io.FileInputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ServicePropertiesMap {

    private static HashMap<String, HashMap<String, String>> mapOfMaps = new HashMap<>();
    private static final Logger logger = LoggerFactory.getLogger(ServicePropertiesMap.class);

    /**
     * Refresh.
     *
     * @param file the file
     * @throws Exception the exception
     */
    public static void refresh(File file) throws Exception {
        try {
            logger.info(String.format("Loading properties - %s", file != null ? file.getName() : ""));

            //Store .json & .properties files into map of maps
            if (file != null) {
                String filePath = file.getPath();

                if (filePath.lastIndexOf(".json") > 0) {

                    ObjectMapper om = new ObjectMapper();
                    TypeReference<HashMap<String, String>> typeRef = new TypeReference<HashMap<String, String>>() {
                    };
                    HashMap<String, String> propMap = om.readValue(file, typeRef);
                    HashMap<String, String> lcasePropMap = new HashMap<>();
                    for (HashMap.Entry<String, String> entry : propMap.entrySet()) {
                        String lcaseKey = ifNullThenEmpty(entry.getKey());
                        lcasePropMap.put(lcaseKey, entry.getValue());
                    }

                    mapOfMaps.put(file.getName(), lcasePropMap);
                } else if (filePath.lastIndexOf(".properties") > 0) {
                    Properties prop = new Properties();
                    FileInputStream fis = new FileInputStream(file);
                    prop.load(fis);

                    @SuppressWarnings("unchecked")
                    HashMap<String, String> propMap = new HashMap<String, String>((Map) prop);

                    mapOfMaps.put(file.getName(), propMap);
                }

                logger.info("File - " + file.getName()
                    + " is loaded into the map and the corresponding system properties have been refreshed");
            } else {
                logger.error("File  cannot be loaded into the map ");
            }
        } catch (Exception e) {
            logger.error("File " + (file != null ? file.getName() : "") + " cannot be loaded into the map ", e);
            throw new Exception("Error reading map file " + (file != null ? file.getName() : ""), e);
        }
    }

    /**
     * Gets the property.
     *
     * @param fileName the file name
     * @param propertyKey the property key
     * @return the property
     */
    public static String getProperty(String fileName, String propertyKey) {
        HashMap<String, String> propMap = mapOfMaps.get(fileName);
        return propMap != null ? propMap.get(ifNullThenEmpty(propertyKey)) : "";
    }

    /**
     * Gets the properties.
     *
     * @param fileName the file name
     * @return the properties
     */
    public static HashMap<String, String> getProperties(String fileName) {
        return mapOfMaps.get(fileName);
    }

    /**
     * If null then empty.
     *
     * @param key the key
     * @return the string
     */
    private static String ifNullThenEmpty(String key) {
        return key == null ? "" : key;
    }
}