/**
    * Copyright (c) 2015 Renato Del Gaudio
    *
    * Permission is hereby granted, free of charge, to any person obtaining a copy
    * of this software and associated documentation files (the "Software"), to deal
    * in the Software without restriction, including without limitation the rights
    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    * copies of the Software, and to permit persons to whom the Software is
    * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all 
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  package com.renatodelgaudio.awsupdate;
  import static org.apache.commons.lang.StringUtils.isBlank;
  import static org.apache.commons.lang.StringUtils.trim;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.util.Properties;
  
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.amazonaws.auth.PropertiesCredentials;
  import com.amazonaws.services.route53.AmazonRoute53;
  import com.amazonaws.services.route53.AmazonRoute53Client;
  
  public class EnvUtil {
  	
  	/**
  	 * This is the expected property passed to Java on boot
  	 * <br> e.g. java -DINSTALL_DIR= 
  	 */
  	public static final String PROP_INSTALL_DIR = "INSTALL_DIR";
  	public static final String PROP_AWS_FILE_NAME = "aws.properties";
  	
  	
  	private final static Logger log = LoggerFactory.getLogger(EnvUtil.class);
  
  	private EnvUtil(){}
  	/*
  	 * It returns the installation path ending with either / or \
  	 */
  	public static String INSTALL_DIR(){
  		String root = System.getProperty(PROP_INSTALL_DIR);
  		
  		if (isBlank(root)){
  			log.error("Environment not initiazed properly. Please make sure Java is started with a not empty value for -D"+PROP_INSTALL_DIR);
  			throw new ConfigurationException("-D"+PROP_INSTALL_DIR+" is missing or empty. Program aborted");
  		}
  		String trim = trim(root);
  		if (!StringUtils.endsWith(trim, "/") && !StringUtils.endsWith(trim, "\\"))
  			trim += File.separator;
  		
  		return trim;
  	}
  	
  	public static String getAwsFilePath(){
  		return INSTALL_DIR() + PROP_AWS_FILE_NAME;
  	}
  	
  	public static AmazonRoute53 buildRoute53(File aws){
  		AmazonRoute53 r53 = null;
  		try {
  			r53 = new AmazonRoute53Client(new PropertiesCredentials(aws));
  		} catch (Exception e) {
  			log.error("Cannot build AmazonRouter53Client",e);
  			throw new ConfigurationException(e.getMessage());
  		} 
  		return r53;
  	}
  	
  	public static Properties getConfigAsProperty(){
  	    String awsPath = getAwsFilePath();
  	    File file = new File(awsPath);
  
  	    FileInputStream stream =null;
  
  	    try {
  		stream = new FileInputStream(file);
  		Properties ret = new Properties();
  		ret.load(stream);
  		return ret;
  	    } 
  	    catch (Exception e) {
  		throw new ConfigurationException(e.getMessage());
  	    }
  	    finally {
 		try {
 		    stream.close();
 		} catch (IOException ignored){}
 	    }
 	}
 }