package org.greenstone.atea;


import com.mongodb.client.MongoDatabase; 
import com.mongodb.MongoClient; 
import com.mongodb.MongoCredential;  

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.Properties;

import org.apache.log4j.Logger;


/** 
 * https://www.tutorialspoint.com/mongodb/mongodb_java.htm
 *
 * TO COMPILE:
 *    maori-lang-detection/src$
 *       javac -cp ".:../conf:../lib/*" org/greenstone/atea/MongoDBAccess.java
 *
 * TO RUN:
 *       java -cp ".:../conf:../lib/*" org.greenstone.atea.MongoDBAccess
 */
public class MongoDBAccess {

    private static Logger logger = Logger.getLogger(org.greenstone.atea.MongoDBAccess.class.getName());
    
    final static String HOST = "localhost";
    final static int PORT = 27017; // mongodb port
    final static String PROPS_FILENAME = "config.properties";
    final static String DB_NAME = "ateacrawldata";
    
    private String USERNAME;
    private String PASSWORD;


    public MongoDBAccess() throws Exception {
	boolean success = false;
	
	// Read in the username and password from our props file
	Properties props = new Properties();

	//File propsFile = new File(PROPS_FILENAME);
	//logger.debug("*** Conf props filename: " + propsFile.getAbsolutePath());
	try {
	    props.load(getClass().getClassLoader().getResourceAsStream(PROPS_FILENAME));	    
	} catch(Exception e) {
	    logger.error(e);
	}
	
	
	USERNAME = props.getProperty("mongodb.user", "");
	if(USERNAME.equals("")) {
	    USERNAME = "root";
	    logger.warn("WARNING: No sensible value for mongodb.user specified in " + PROPS_FILENAME + " defaulting to: " + USERNAME);
			}
	PASSWORD = props.getProperty("mongodb.pwd");

	logger.debug("Got pwd: " + PASSWORD);
	
	if(PASSWORD != null && PASSWORD.equals("CHANGEME")) {
	    
	    success = false;
	    throw new Exception("************ FATAL ERROR: Change DB password in properties file " + PROPS_FILENAME);	    
	}
    }


    public void connectToDB() throws Exception {
	// Creating a Mongo client 
	MongoClient mongo = new MongoClient( HOST, PORT ); 
	
	// Creating Credentials 
	MongoCredential credential; 
	credential = MongoCredential.createCredential(USERNAME, DB_NAME, PASSWORD.toCharArray()); 
	System.out.println("Connected to the database successfully");  
	
	// Accessing the database 
	MongoDatabase database = mongo.getDatabase(DB_NAME); 
	//System.out.println("Credentials: "+ credential);
    }
    

    public static void main(String args[]) {
	try {
	    MongoDBAccess mongodbCon = new MongoDBAccess();
	    //mongodbCon.connectToDB();
	}catch(Exception e) {
	    e.printStackTrace();
	}
    }
}