/*
 * Copyright (C) 2021 Samsung Electronics
 * 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.a1pesimulator.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Properties;
import org.onap.a1pesimulator.data.VnfConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

@Service
public class VnfConfigReader {

    private static final Logger log = LoggerFactory.getLogger(VnfConfigReader.class);

    private String vnfConfigFile;

    private VnfConfigReader(@Value("${vnf.config.file}") String vnfConfigFile) {
        this.vnfConfigFile = vnfConfigFile;
    }

    public VnfConfig getVnfConfig() {

        Properties props = new Properties();
        VnfConfig vnfConfig;

        try {
            props.load(new FileReader(vnfConfigFile));
            ObjectMapper mapper = new ObjectMapper();
            vnfConfig = mapper.convertValue(props, VnfConfig.class);
        } catch (FileNotFoundException e) {
            String errorMsg = "Could not find vnfConfigFile under: " + vnfConfigFile;
            log.error(errorMsg);
            throw new VnfConfigReaderException(errorMsg, e);
        } catch (Exception e) {
            String errorMsg = "Failed to get VnfConfig: " + e.getMessage();
            log.error(errorMsg);
            throw new VnfConfigReaderException(errorMsg, e);
        }

        return vnfConfig;
    }

    private static class VnfConfigReaderException extends RuntimeException {

        private static final long serialVersionUID = 1L;

        public VnfConfigReaderException(String message, Throwable t) {
            super(message, t);
        }
    }
}