/**import codes **/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JOptionPane;

/**body codes **/
/**dont forget to change the file loc **/
/**field names are un,pw,em **/
/**generate the data first then erase the first lines :> **/

File f = new File("C:\\Users\\Ivan Louise\\Documents\\Accounts");
    int ln;
    String username,password,email;

    public Login() {
        initComponents();
    }
    void createFolder(){
        if(!f.exists()){
            f.mkdirs();
        }
    }

    void readFile(){
        try {
            FileReader fr = new FileReader(f+"\\database.text");
            System.err.println("connected to database");
        } catch (FileNotFoundException ex) {
            try {
                FileWriter fw = new FileWriter(f+"\\database.text");
                System.out.println("File created");
            } catch (IOException ex1) {
                Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex1);
            }
        }

    }

    void addData(String user,String pass,String email){
        RandomAccessFile raf;
        try {
            raf = new RandomAccessFile(f+"\\database.text","rw");
            for(int i=0;i<ln;i++){
                raf.readLine();
            }
            raf.writeBytes("\r\n");
            raf.writeBytes("\r\n");
            raf.writeBytes("Username:"+user+"\r\n");
            raf.writeBytes("Password:"+pass+"\r\n");
            raf.writeBytes("Email:"+email);
            JOptionPane.showMessageDialog(null, "Registered Successfully");

        } catch (FileNotFoundException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        }


    }

    void CheckData(String user,String pass){
        try {
            RandomAccessFile raf = new RandomAccessFile(f+"\\database.text", "rw");
            String line = raf.readLine();
            username=line.substring(9);
            password=raf.readLine().substring(9);
            email=raf.readLine().substring(6);
            if(user.equals(username)&password.equals(password)){
                JOptionPane.showMessageDialog(null, "Pasword matched");
            }
            else{
                JOptionPane.showMessageDialog(null, "invalid username or password");
            }

        } catch (FileNotFoundException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    void logic(String user,String pass){
        try {
            RandomAccessFile raf= new RandomAccessFile(f+"\\database.text", "rw");
            for(int i=0;i<ln;i+=4){

            String forUser = raf.readLine().substring(9);
            String forPswd = raf.readLine().substring(9);
            if(user.equals(forUser) & pass.equals(forPswd)){
                JOptionPane.showMessageDialog(null, "Log in successfully");
                break;
            }else if(i==(ln-4)){
                JOptionPane.showMessageDialog(null, "login failed");
                break;
            }
            for(int k=1;k<=2;k++){
                raf.readLine();
            }
        }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        }

    }

    void countLines(){
        try {
            ln=1;
            RandomAccessFile raf = new RandomAccessFile(f+"\\database.text", "rw");
            for(int i=0;raf.readLine()!=null;i++){
                ln++;
            }
            System.out.println("number of lines:"+ln);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex);
        }
    }



/**button codes **/
 private void registerActionPerformed(java.awt.event.ActionEvent evt) {
        createFolder();
        readFile();
        countLines();
        addData(un.getText(),pw.getText(),em.getText());
    }

    private void clearActionPerformed(java.awt.event.ActionEvent evt) {
       un.setText("");
       pw.setText("");
       em.setText("");
    }

    private void loginActionPerformed(java.awt.event.ActionEvent evt) {
        createFolder();
        readFile();
        countLines();
        logic(un.getText(),pw.getText());
    }