import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.text.DecimalFormat;

public class S0754012
{
	  static StringBuffer total = new StringBuffer();
	  static JFrame frm = new JFrame("BMI calculator");
	  static double height=0;
	  static double weight=0;
	  static double sum = 0;
	  static String note = "";


	  //static String heightAns;
	  //static String weightAns;

	  public static void main(String args[])
	  {
		  DecimalFormat df = new DecimalFormat("#.00");
		  Container contentPane = frm.getContentPane();

		  //declare

		  JLabel title = new JLabel("BMI Calculator",JLabel.CENTER);
		  JLabel height_Label = new JLabel("Height(cm) ",JLabel.CENTER);
		  JLabel weight_Label = new JLabel("Weight(kg) ",JLabel.CENTER);
		  JLabel result = new JLabel("Result ",JLabel.CENTER);
		  JLabel display = new JLabel("",JLabel.CENTER);


		  JTextField height_TextField = new JTextField(Double.toString(height),JTextField.CENTER);
		  JTextField weight_TextField = new JTextField(Double.toString(weight),JTextField.CENTER);

		  //adding

		  contentPane.add(title);
		  contentPane.add(height_Label);
		  contentPane.add(weight_Label);
		  contentPane.add(result);
		  contentPane.add(display);

		  contentPane.add(height_TextField);
		  contentPane.add(weight_TextField);


		  //setting attribute

		  frm.setLayout(null);

		  title.setBounds(70,0,200,50);
		  title.setFont(new java.awt.Font("Arial",1,20));

		  height_Label.setBounds(-20,50,170,50);
		  height_Label.setFont(new java.awt.Font("Arial",1,20));

		  weight_Label.setBounds(-20,100,170,50);
		  weight_Label.setFont(new java.awt.Font("Arial",1,20));

		  result.setBounds(-30,170,170,50);
		  result.setFont(new java.awt.Font("Arial",1,20));

		  display.setBounds(100,170,300,50);
		  display.setFont(new java.awt.Font("Arial",1,20));


		  height_TextField.setBounds(130,60,100,30);
		  weight_TextField.setBounds(130,110,100,30);


		  frm.setSize(450,300);
		  frm.setVisible(true);

		  //setting behavior


		  height_TextField.getDocument().addDocumentListener(new DocumentListener()
		  {
			  public void changedUpdate(DocumentEvent e)
			  {

			  }
			  public void insertUpdate(DocumentEvent e)
			  {
				  String heightAns = height_TextField.getText().trim();
				  if(isNumeric(heightAns))
				  {
					  height = Double.parseDouble(heightAns);

					  cal(display);
				  }


				  display.setText("BMI = " + df.format(sum) + "(" + note + ")");

			  }
			  public void removeUpdate(DocumentEvent e)
			  {
				  String heightAns = height_TextField.getText().trim();
				  if(isNumeric(heightAns))
				  {
					  height = Double.parseDouble(heightAns);

					  cal(display);
				  }


				  display.setText("BMI = " + df.format(sum) + "(" + note + ")");


			  }
		  });

		  weight_TextField.getDocument().addDocumentListener(new DocumentListener()
		  {
			  public void changedUpdate(DocumentEvent e)
			  {

			  }
			  public void insertUpdate(DocumentEvent e)
			  {
				  String weightAns = weight_TextField.getText().trim();
				  if(isNumeric(weightAns))
				  {
					  weight = Double.parseDouble(weightAns);

					  cal(display);
				  }


				  display.setText("BMI = " + df.format(sum) + "(" + note + ")");


			  }
			  public void removeUpdate(DocumentEvent e)
			  {
				  String weightAns = weight_TextField.getText().trim();
				  if(isNumeric(weightAns))
				  {
					  weight = Double.parseDouble(weightAns);

					  cal(display);
				  }


				  display.setText("BMI = " + df.format(sum) + "(" + note + ")");


			  }
		  });










	  }
	  public static void cal(JLabel display)
	  {
		  sum = weight / Math.pow(height/100, 2);

		  if(sum < 18.5)
		  {
			  note = "Underweight";
			  display.setForeground(Color.RED);
		  }
		  else if (sum >= 18.5 && sum < 24)
		  {
			  note = "Normal";
			  display.setForeground(Color.BLUE);
		  }
		  else if (sum >= 24 && sum < 27)
		  {
			  note = "Overweight";
			  display.setForeground(Color.RED);
		  }
		  else if (sum >= 27 && sum < 30)
		  {
			  note = "Mild Obesity";
			  display.setForeground(Color.RED);
		  }
		  else if (sum >= 30 && sum < 35)
		  {
			  note = "Moderate Obesity";
			  display.setForeground(Color.RED);
		  }
		  else
		  {
			  note = "Severe Obesity";
			  display.setForeground(Color.RED);
		  }
	  }

	  public static boolean isNumeric(String strNum)
	  {
		    if (strNum == null)
		    {
		        return false;
		    }
		    try
		    {
		        double d = Double.parseDouble(strNum);
		    }
		    catch (NumberFormatException nfe)
		    {
		        return false;
		    }
		    return true;
		}


	  //close window
	  static class ActLis extends WindowAdapter implements ActionListener
	  {
	    public void actionPerformed(ActionEvent e){
	      JOptionPane.showMessageDialog(null,"close","Closing?",JOptionPane.WARNING_MESSAGE);
	    }
	    public void windowClosing(WindowEvent e) {
	      System.out.print("window closing!");
	      frm.dispose();
	      System.exit(0);
	    }

	   }

}