import java.io.*;

public class Accounts
{
    public static void main(String args[])throws IOException
    {
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        Methods met=new Methods();
        met.GMes();
        String op=null;
        try{
            op=in.readLine();
            op=op.toLowerCase();
            if (op.equals("login") || op.equals("register"))
            {
                if (op.equals("login"))
                {
                    met.login();
                }else{
                    met.register();
                }
            }else{
                System.out.println("Wrong command entered.");
            }
        }catch (Exception e){
        System.out.println("Error");
        }

    }
}

class Methods
{
    private     File dir=new File("acc/");
    private     String[] acc=dir.list();

    void GMes()
    {
        System.out.println("Welcome to the login/register section\n\nWould you like to Login or Register?\n(login/register)");
    }

    void login()throws IOException
    {
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("\t-=LOGIN=-");
        System.out.println("Enter your username:");
        String name=in.readLine();
        acc=dir.list();
        if(checkName(name))
        {
            System.out.println("Enter your password:");
            String pass=in.readLine();
            if (checkPass(pass,name))
            {
                Login l=new Login(name,pass);
                l.wel();
            }else{
                System.out.println("Wrong Password");
        }}else{
            System.out.println("No such login name");
        }
    }

    boolean checkName(String name)
    {
        boolean exist=false;
        int i=0;
        while(!exist && i<acc.length)
        {
            if (acc[i].equals(name))
            {
                exist=true;
            }
            i++;
        }
        return exist;
    }

    boolean checkPass(String pass,String name)throws IOException
    {
        BufferedReader in=new BufferedReader(new FileReader("acc/"+name));
        String password=in.readLine();
        if (password.equals(pass))
        {
            return true;
        }else{
            return false;
        }
    }


    void register()throws IOException
    {
        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
        boolean used=false;
        String name=null;
        while (!used)
        {
            System.out.println("\t-=REGISTER=-");
            System.out.println("Please enter your desired username:");
            name=in.readLine();
            if (usedName(name))
            {
                used=false;
                System.out.println("Username already taken, please choose another one.");
            }else{
                used=true;
            }
        }
        System.out.println("Enter password for you account:");
        String pass=in.readLine();
        addPass(pass,name);
        System.out.println("Account created.\n");
        login();
    }

    boolean usedName(String name)throws IOException
    {
        File n=new File("acc/"+name);
        if(n.exists())
        {
            return true;
        }else{
            n.createNewFile();
            return false;
        }
    }

    void addPass(String pass, String name)throws IOException
    {
        BufferedWriter out=new BufferedWriter(new FileWriter("acc/"+name));
        out.write(pass);
        out.close();
    }


}