import javax.swing.JOptionPane;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author rukes
 */
public class Vzorecek extends javax.swing.JFrame {

    /**
     * Creates new form Vzorecek
     */
    public Vzorecek() {
        initComponents();
        setLocationRelativeTo(null);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        hmotnost = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        vyska = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        vystup = new javax.swing.JTextField();
        jLabel5 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Výpočet BMI");
        setMinimumSize(new java.awt.Dimension(350, 200));
        setResizable(false);

        jLabel1.setText("Zadej hmotnost:");

        jLabel2.setText("Zadej výšku:");

        jLabel3.setText("kg");

        jLabel4.setText("cm");

        jButton1.setText("Počítej");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        vystup.setEditable(false);

        jLabel5.setText("BMI:");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1)
                    .addComponent(jLabel2)
                    .addComponent(jButton1))
                .addGap(51, 51, 51)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(vystup, javax.swing.GroupLayout.PREFERRED_SIZE, 124, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(vyska, javax.swing.GroupLayout.DEFAULT_SIZE, 124, Short.MAX_VALUE)
                            .addComponent(hmotnost))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3)
                            .addComponent(jLabel4))))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(hmotnost, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1)
                    .addComponent(jLabel3))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(vyska, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel4))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 29, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(vystup, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel5))
                .addGap(28, 28, 28))
        );

        setBounds(0, 0, 320, 196);
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        String vstupHmotnost = hmotnost.getText();
        if(vstupHmotnost == null || vstupHmotnost.isEmpty()){
            JOptionPane.showMessageDialog(this, "Nezadal jsi hmotnost", "Chyba!", JOptionPane.ERROR_MESSAGE);
            return;
        }
        double hmot = 0;
        try {
            hmot = Double.parseDouble(vstupHmotnost.replace(",", "."));
        } catch (Exception ex){
            JOptionPane.showMessageDialog(this, "Nezadal jsi správně hmotnost", "Chyba!", JOptionPane.ERROR_MESSAGE);
            return;
        }

        String vstupVyska = vyska.getText();
        if(vstupVyska == null || vstupVyska.isEmpty()){
            JOptionPane.showMessageDialog(this, "Nezadal jsi výšku", "Chyba!", JOptionPane.ERROR_MESSAGE);
            return;
        }
        double vys = 0;
        try{
            vys = Double.parseDouble(vstupVyska.replace(",", "."));
        } catch (Exception ex){
            JOptionPane.showMessageDialog(this, "Nezadal jsi správně výšku", "Chyba!", JOptionPane.ERROR_MESSAGE);
            return;
        }
        if(vys <= 0){
            JOptionPane.showMessageDialog(this, "Nelze spočítat!", "Chyba!", JOptionPane.ERROR_MESSAGE);
            return;
        }

        vys = vys / 100;
        double bmi = hmot / (vys * vys);

        String vysledek = String.format("%.2f", bmi);

        vystup.setText(vysledek);
        JOptionPane.showMessageDialog(this, "Tvoje BMI: " + vysledek, "Výpočet", JOptionPane.INFORMATION_MESSAGE);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Vzorecek.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Vzorecek.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Vzorecek.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Vzorecek.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Vzorecek().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JTextField hmotnost;
    private javax.swing.JButton jButton1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JTextField vyska;
    private javax.swing.JTextField vystup;
    // End of variables declaration
}