// Autor: Antonín Daněk

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
import javax.swing.JOptionPane;


public class client {

    public static int PORT=3555;
    public static String IP;
    String robotsName;
    String input,fromServer;

    Socket sck;
    BufferedReader br;
    PrintWriter pw;

    Scanner sc = new Scanner(System.in);

    // Its used for finding out rotation of Karel
    Point current=null;
    int rotation;

    public client(String ip, String port){

        IP=ip;
        PORT=Integer.valueOf(port);

        // connects to the server
        try {
            sck = new Socket(IP, PORT);
        } catch (UnknownHostException e) {
            JOptionPane.showMessageDialog(null,"There is no server running on "+ IP);
        } catch (IOException e) {
            JOptionPane.showMessageDialog(null,"There is no server running on "+ IP +" (I/O error)");
        }

        // creates object for data send / recieve
        try{
        br = new BufferedReader(new InputStreamReader(sck.getInputStream()));
        pw = new PrintWriter(sck.getOutputStream(), true);
        } catch (IOException ex) {
        System.err.print("Connection creation failed on port " + PORT);
        }

        // waits until server sends legend and the name of robot
        try{
        while(true){
        if((robotsName = br.readLine()) != null){
            System.out.println(robotsName);
            robotsName = parseName(robotsName);

            if(robotsName.equals("")) continue; else break;
        }}}
        catch (IOException e) {
        e.printStackTrace();
        }

        System.out.println();
        System.out.println("Robots name is: '" + robotsName+"'");
        System.out.println();

int state;
while(true){

            System.out.print(robotsName +" ");

            //loads order from the command line
            input = sc.nextLine();

            //if user insert command NAJDI (which is not included in SERVERs protocol)
            //program automatically finds the secret
            if(input.equals("NAJDI")) {
                getRotation();
                find();

            System.out.println(fromServer);

            //If one of these codes come, program ends, robot found secret or its destroied
            state = getNumberFromMessage(fromServer);
            if(state==221 || state==530 || state==550 || state==571 || state==572){
                end();
                break;

            }

                end();
                break;
            }
            // If user doesn't use NAJDI for autosearch, user can send standard commands
            else {
            pw.print(robotsName + " " + input + "\r\n");
            pw.flush();

            // waits for data from server and save it into member fromServer
            waitForData();

            }

            System.out.println(fromServer);

            //If one of these codes come, program ends, robot found secret or its destroied
            state = getNumberFromMessage(fromServer);
            if(state==221 || state==530 || state==550 || state==571 || state==572){
                end();
                break;

            }

        }
        }

    //used for autosearch, it moves Karel to coordinates (0,0)
    void find(){
        System.out.println("rotace:" + rotation);

        //turns Karel to correct way on axe x
        if(current.x>0){turnToTheLeft();}
        else if(current.x<0){turnToTheRight();}

        //make steps until x coordinate is 0
        while(current.x!=0){

          pw.print(robotsName + " KROK" + "\r\n");
          System.out.println((robotsName + " KROK"));
          pw.flush();

            // waits for data from server and save it into member fromServer
            waitForData();
            System.out.println(fromServer);

            if(getNumberFromMessage(fromServer)==250){

                current=getCoordinatesFromMessage(fromServer);

            }
            // if robot is broken, repair it
            else if(getNumberFromMessage(fromServer)==570) {

                repairRobotFromMessage(fromServer);

            }

            //this should never happend
            else System.out.println("Algorithm error (" + fromServer + ")");

        }

        //turns Karel to correct way on axe y
        if(current.y<0){turnToTheUp();}
        else if(current.y>0){turnToTheDown();}

        //make steps until y coordinate is 0
        while(current.y!=0){

          pw.print(robotsName + " KROK" + "\r\n");
            System.out.println(robotsName + " KROK");
          pw.flush();

            // waits for data from server and save it into member fromServer
            waitForData();
            System.out.println(fromServer);

            if(getNumberFromMessage(fromServer)==250){

                current=getCoordinatesFromMessage(fromServer);

            }

            // if robot is broken, repair it
            else if(getNumberFromMessage(fromServer)==570) {

                repairRobotFromMessage(fromServer);

            }
             //this should never happend
            else System.out.println("Algorithm error (" + fromServer + ")");

        }
          // At this point, robot is on coordinates (0,0) so it can read the secret
          pw.print(robotsName + " ZVEDNI" + "\r\n");
          System.out.println(robotsName + " ZVEDNI");
          pw.flush();
          waitForData();
    }

    // Turns robot to the left (from outside it is independentl on current rotation)
    void turnToTheLeft(){
    if(rotation==0){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        }

    if(rotation==1){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);}

    if(rotation==2){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);}

    if(rotation==3){
    }
    rotation=3;
    System.out.println("I am turned LEFT now.");
    }


    // Turns robot to the right (from outside it is independentl on current rotation)
    void turnToTheRight(){
    if(rotation==0){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);}

    if(rotation==1){
    }

    if(rotation==2){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }

    if(rotation==3){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        }
    rotation=1;
    System.out.println("I am turned RIGHT now.");
    }

    // Turns robot up (from outside it is independentl on current rotation)
    void turnToTheUp(){
    if(rotation==0){
    }

    if(rotation==1){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }

    if(rotation==2){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }

    if(rotation==3){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }
    rotation=0;
    System.out.println("I am turned UP now.");
    }

    // Turns robot down (from outside it is independentl on current rotation)
    void turnToTheDown(){
    if(rotation==0){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }

    if(rotation==1){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }

    if(rotation==2){
    }

    if(rotation==3){
        pw.print(robotsName + " VLEVO" + "\r\n");System.out.println(robotsName + " VLEVO");
        pw.flush();
        waitForData();System.out.println(fromServer);
    }
    System.out.println("I am turned DOWN now.");
    rotation=2;
    }

    // it makes one turn and one step to find out current rotation of Karel
    // 0-up;1-right;2-down;3-left
    void getRotation(){

        Point last=null;

     //get coorinates of start position
      while(last==null) {
          pw.print(robotsName + " VLEVO" + "\r\n");
          pw.flush();
          System.out.println(robotsName + " VLEVO");

            // waits for data from server and save it into member fromServer
            waitForData();
            System.out.println(fromServer);

            if(getNumberFromMessage(fromServer)==250){

                last=getCoordinatesFromMessage(fromServer);

            }
            //this should never happend
            else System.out.println("Algorithm error (" + fromServer + ")");

          }

      //get coordinates of position after one step
      while(current==null) {
          pw.print(robotsName + " KROK" + "\r\n");
          pw.flush();
          System.out.println(robotsName + " KROK");

            // waits for data from server and save it into member fromServer
            waitForData();
            System.out.println(fromServer);

            if(getNumberFromMessage(fromServer)==250){

                current=getCoordinatesFromMessage(fromServer);

            }

            // if robot is broken, repair it
            else if(getNumberFromMessage(fromServer)==570) {

                repairRobotFromMessage(fromServer);

            }
            //this should never happend
            else System.out.println("Algorithm error (" + fromServer + ")");

          }

        //finding rotation from two obtained coordinates
                    if(last.x==current.x) {

                        if(last.y<current.y) rotation=0;
                        else rotation=2;

                    }
                    else {
                        if(last.x<current.x) rotation=1;
                        else rotation=3;
                    }

    }

    // waits for data from server and save it into member fromServer
    void waitForData(){

        try{
        while((fromServer = br.readLine()) == null){}
        } catch(IOException e){
            e.printStackTrace();
        }

    }

    // this is called in the end, when robot finds the secret or is broken
    void end(){

                //This is for case that secret is longer than one line
                try{
                while((fromServer = br.readLine()) != null){System.out.println(fromServer);}
                } catch (IOException e) {e.printStackTrace();}

                // closes connection
                try{
                br.close();
                pw.close();
                sck.close();
                } catch(IOException e){e.printStackTrace();}

    }

    //It takes message with information about robots breakage and repairs it
    void repairRobotFromMessage(String message){

        String tst=robotsName + " OPRAVIT "+Integer.parseInt(message.split(" ")[3]);
        pw.print(tst + "\r\n");
        pw.flush();
        System.out.println(tst);
        waitForData();
        System.out.println(fromServer);

    }

    //It takes message and returns its numer (integer)
    int getNumberFromMessage(String message){
       return (Integer.parseInt(message.split(" ")[0])) ;

    }

    //It takes message with OK code and returns Point (coordinates) of the robot
    Point getCoordinatesFromMessage(String message){

       String work=message.split(" ")[2];
       String w[] = new String[2];
       w=work.split(",");
       String work2=w[0].substring(1);

        String str="";
        for (int i = 0; i < w[1].length(); i++) {
            String prom="" + w[1].charAt(i);

            if(!prom.equals(")"))
            str=str + w[1].charAt(i);
            else break;

        }

        return new Point(Integer.parseInt(work2),Integer.parseInt(str));

    }

    // Its used for optaining the robots name
    String parseName (String parseName){
    String[] substrings = parseName.split(" ");
    parseName=""; String name="";

        for (int i = 0; i < substrings.length; i++) {
            if(substrings[i].equals("Oslovuj") && i<(substrings.length+2) && substrings[i+1].equals("mne")){

                for (int j = i+2; j < substrings.length; j++) {

                        if(parseName.equals(""))
                        parseName=parseName+""+substrings[j];
                        else parseName=parseName+" "+substrings[j];

                        if(substrings[j].endsWith(".") ||
                                substrings[j].endsWith("." + "\r\n")){

                            //clean the name
                            for (int k = 0; k < parseName.length(); k++) {
                               String prac = ""+parseName.charAt(k);

                                if (prac.equals(".")) break;
                                else name = name+""+parseName.charAt(k);

                            }


                            break;
                            }

                }


            }

        }


    return name;
    }

    public static void main(String[] args) {

        if(args.length!=2) System.out.println("Usage: Client <IP_ADDRESS_OR_DNS_NAME> <PORT>");
        else new client(args[0],args[1]);
        //new client("dsnlab1.felk.cvut.cz");
        //new client("localhost");

    }

}

//represents coordinates
class Point{

    int x;
    int y;

    public Point(int xx,int yy){

        this.x=xx;
        this.y=yy;

    }

boolean equal(Point b){

    if((this.x==b.x) && (this.y==b.y)) return true; else return false;

}

}