import java.io.*;

public class login extends VMachine
{
    
    private String username;
    
    public login ()
    {
    }
    
    public void run()
    {
        FileClassLoader fileclass = null;
        fileclass = new FileClassLoader();
        fileclass.bindir = "C:\\java\\OSVM\\bin\\";
        
        boolean auth = false;
        int passcount = 0;
        
        String input = args[0];
        String passwd = "";
        
        if(input.compareTo("")==0)
        {// Initial input retrieval
            try
            {
                sysapi.Write(OUT,"login: ");
                input = sysapi.Read(IN);
                input = input.trim();
                sysapi.Write(OUT,"password: ");
                passwd = sysapi.Read(IN);
                passwd = passwd.trim();
            }
            catch(Exception ex)
            {
                System.out.println(ex);
            }
        }
        else
        {// Case parameter was a username
            try
            {
                sysapi.Write(OUT,"password: ");
                passwd = sysapi.Read(IN);
                passwd = passwd.trim();
            }
            catch(Exception ex)
            {
                System.out.println(ex);
            }
        }
        
        while(sysapi.findUser(input) != null)
        {// Checks to see if user is logged in
            try
            {
                sysapi.Write(OUT,input + " Already Logged In.\n");
                sysapi.Write(OUT,"login: ");
                input = sysapi.Read(IN);
                input = input.trim();
                sysapi.Write(OUT,"password: ");
                passwd = sysapi.Read(IN);
                passwd = passwd.trim();
            }
            catch(Exception ex)
            {
                System.out.println(ex);
            }
            
        }
        
        try
        {
            File passfile = new File("C:\\java\\OSVM\\sys\\pass");
            
            passfile.createNewFile();
            //Opens Password File for read access
            RandomAccessFile iostream = new RandomAccessFile(passfile,"r");
            
            String line;
            do{// Loops until a valid username is found
                line = iostream.readLine();
                
                if(line==null)
                {
                    line="";
                    sysapi.Write(OUT,"Username not found.\n");
                    sysapi.Write(OUT,"login: ");
                    input = sysapi.Read(IN);
                    input = input.trim();
                    sysapi.Write(OUT,"password: ");
                    passwd = sysapi.Read(IN);
                    passwd = passwd.trim();
                    iostream.seek(0);
                }
        }while(! line.startsWith(input) ||  input.compareTo("")==0);
            
            //Found Suitable Username, now checking password
            
            do{// Loops until password is correct or 5 tries
                auth = line.endsWith(passwd);
                
                if(! auth || passwd.compareTo("")==0)
                {
                    auth = false;
                    sysapi.Write(OUT,"Password Incorrect\n");
                    sysapi.Write(OUT,"password: ");
                    passwd = sysapi.Read(IN);
                    passwd = passwd.trim();
                    passcount++;
                }
            }while(! auth && passcount < 5);
        }
        catch(Exception ex)
        {
            System.out.println(ex);
        }
        
        if(passcount < 5 && auth)
        {// Bypasses the rest of login creation if not authorized or passcount >= 5
            try
            {
                File checkdir = new File("C:\\java\\OSVM\\usr\\" + input + "\\");
                checkdir.mkdir();
                
            }
            catch(Exception ex)
            {
                System.out.println(ex);
            }
            
            User newuser = new User(input,passwd);
            newuser.setcurrentPath("C:\\java\\OSVM\\usr\\" + input + "\\");
            
            sysapi.setUser(newuser);
            
            if(((VMachine)vmh.getType()).Parent != null)
            {//Detaches this 'login' VM from previous User VM Tree and makes new tree within new User
                sysapi.Exit(vmh,owner);
                
                ((VMachine)vmh.getType()).Parent = null;
                
                IN = sysapi.OpenDevice("keyboard",input);
                OUT = sysapi.OpenDevice("display",input);
                
            }
            else
            {
                sysapi.setTitle(input);
            }
            
            try
            {
                sysapi.Write(OUT,"Welcome to OSVM, " + input + "\n");
            }
            catch(Exception ex)
            {
                System.out.println(ex);
            }
            
            newuser.addHandle(vmh);
            
            try
            {//Loads Shell VM
                Class VMClass2 = fileclass.loadCmd("shell");
                
                String[] args= new String[1];
                args[0] = "";
                
                Handle vmh2 = sysapi.CreateVM(IN,OUT,VMClass2,input,args,this,null,0);
                
                newuser.addHandle(vmh2);
            }
            catch(Exception ex)
            {
                System.out.println("Exception while creating new shell.");
            }
           
            sysapi.Compute(vmh); // Runs Shell
            
            sysapi.Exit(vmh,input);
        }// End of Passcount , authenticate if
        else
        {// Exits here if quitting login without a new user
            if(owner.compareTo("")!=0)
            {//Case not inital login
                sysapi.Exit(vmh,owner);
            }
            else
            {
                System.exit(0);
            }
        }
        
    }
    
}