import java.util.*;
import java.io.*;
import redis.clients.jedis.Jedis; 

class MakeEnroll {

    public static void main(String[] args) throws FileNotFoundException {

        // hostname is command-line arg, or localhost by default                
        String hostname = "localhost";
        if(args.length>0){
            hostname = args[0];
        }

        //Connecting to Redis server on localhost
        Jedis jedis = new Jedis(hostname);
	System.out.println("Connection to server sucessfully"); 
	//check whether server is running or not 
	System.out.println("Server is running: "+jedis.ping()); 

	Scanner scan = new Scanner(new File("enroll.txt"));

	while(scan.hasNextLine()){
	    String line = scan.nextLine();
	    String[] parsed = line.split("\t");
	    if(parsed.length!=4){
		System.out.println("error in line:"+line);
	    }
	    else {
		String eid = parsed[0];
		String studentid = parsed[1];
		String sectid = parsed[2];
		String grade = parsed[3];
		String sname = jedis.get("student:"+studentid+":sname");
		String ctitle = jedis.get("section:"+sectid+":ctitle");
		System.out.println("eid:"+eid+" studentid:"+studentid+" sectid:"+sectid+" grade:"+grade+" sname:"+sname+" ctitle:"+ctitle);
		jedis.rpush("enroll",eid);
		jedis.set("enroll:"+eid+":studentid",studentid);
		jedis.set("enroll:"+eid+":sectid",sectid);
		jedis.set("enroll:"+eid+":grade",grade);
		jedis.hset("enroll:"+eid,"studentid",studentid);
		jedis.hset("enroll:"+eid,"sectid",sectid);
		jedis.hset("enroll:"+eid,"grade",grade);
		jedis.sadd("student:"+studentid+":sections",sectid);
		jedis.sadd("student:"+studentid+":courses",ctitle);
		jedis.sadd("section:"+sectid+":students",studentid);
		if(sname!=null){
		    jedis.set("enroll:"+eid+":sname",sname);
		    jedis.hset("enroll:"+eid,"sname",sname);
		    jedis.sadd("student:"+sname+":sections",sectid);
		    jedis.sadd("section:"+sectid+":studentsbyname",sname);
		}
		if(ctitle!=null){
		    jedis.set("enroll:"+eid+":ctitle",ctitle);
		    jedis.hset("enroll:"+eid,"ctitle",ctitle);
		    jedis.sadd("course:"+ctitle+":students",studentid);
		}
		if(ctitle!=null && sname!=null){
		    jedis.sadd("student:"+sname+":courses",ctitle);
		}
	    }
	}
    }
}