import javax.swing.*; // import all javax.swing
import java.awt.*; // import all java.awt
import java.awt.event.*;
import java.util.HashMap;
import java.util.Map;

public class Keyboard extends JFrame implements KeyListener { // start of the class

    private JTextArea field = new JTextArea(10,62); // create an instance of JTextField
    private JPanel mainPanel = new JPanel(); // create an instance of JPanel
    private JPanel TopLabPan = new JPanel(); // create an instance of JPanel
    private JPanel TopFieldPan = new JPanel();
    private JPanel MainBtnsPan = new JPanel();
    private JPanel FirstRowPan = new JPanel();
    private JPanel SecondRowPan = new JPanel();
    private JPanel ThirdRowPan = new JPanel();
    private JPanel FourthRowPan = new JPanel();
    private JPanel FifthRowPan = new JPanel();
    private JLabel TopLab = new JLabel("Type some text using your keyboard. The keys press will be highlighted and the text will be display");
    private JLabel BotLab = new JLabel("Note: clicking the buttons with your mouse will not perform any action");  // create an instance of JLabel with a default text


    private static String[] FirstRow = {"~", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-", "+", "Backspace"};
    private static String[] SecondRow = {"TAB", "Q", "W", "E", "R", "T", "Y", "U", "I", "O", "P", "[", "]", "\\"};
    private static String[] ThirdRow = {"Caps", "A", "S", "D", "F", "G", "H", "J", "K", "L", ":", "\"", "Enter"};
    private static String[] FourthRow = {"Shift", "Z", "X", "C", "V", "B", "N", "M", ",", ".", "?", "^"};

    JPanel firstBtn = new JPanel();
    JPanel secondBtn = new JPanel();
    JPanel thirdBtn = new JPanel();
    JPanel fourthBtn = new JPanel();
    JPanel fifthBtn = new JPanel();


    private JButton Space = new JButton("");

    private Map<String, JButton> buttonMap = new HashMap<String, JButton>();


    public Keyboard(){ // start of the weather constructor


        for (int i = 0; i < FirstRow.length-1; i++) {
            JButton btn = new JButton(FirstRow[i]);
            buttonMap.put(FirstRow[i].toLowerCase(), btn);
            btn.setPreferredSize(new Dimension(45,45));
            firstBtn.add(btn);
        }

        JButton Bspc = new JButton("Backspace");
        Bspc.setPreferredSize(new Dimension(100,45));
        firstBtn.add(Bspc);


        JButton Tabs = new JButton("Tab");
        Tabs.setPreferredSize(new Dimension(70,45));
        secondBtn.add(Tabs);

        for (int i = 1; i < SecondRow.length; i++) {
            JButton btn = new JButton(SecondRow[i]);
            buttonMap.put(SecondRow[i].toLowerCase(), btn);
            btn.setPreferredSize(new Dimension(46,45));
            secondBtn.add(btn);
        }

        JButton Caps = new JButton("Caps");
        Caps.setPreferredSize(new Dimension(70,45));
        thirdBtn.add(Caps);

        for (int i = 1; i < ThirdRow.length-1; i++) {
            JButton btn = new JButton(ThirdRow[i]);
            btn.setPreferredSize(new Dimension(45,45));
            thirdBtn.add(btn);
        }

        JButton Enter = new JButton("Enter");
        Enter.setPreferredSize(new Dimension(90,45));
        thirdBtn.add(Enter);

        JButton Shift = new JButton("Shift");
        Shift.setPreferredSize(new Dimension(95,45));
        fourthBtn.add(Shift);

        for (int i = 1; i < FourthRow.length - 1; i++) {
            JButton btn = new JButton(FourthRow[i]);
            btn.setPreferredSize(new Dimension(45,45));
            fourthBtn.add(btn);
        }

        JButton up = new JButton("^");
        up.setPreferredSize(new Dimension(45,45));
        fourthBtn.add(Box.createRigidArea(new Dimension(21,0)));
        fourthBtn.add(up);

        fifthBtn.add(Box.createRigidArea(new Dimension(154,0)));
        Space.setPreferredSize(new Dimension(280,45));
        fifthBtn.add(Space);

        JButton left = new JButton("<");
        fifthBtn.add(Box.createRigidArea(new Dimension(60,0)));
        left.setPreferredSize(new Dimension(45,45));
        fifthBtn.add(left);

        JButton down = new JButton("v");
        down.setPreferredSize(new Dimension(45,45));
        fifthBtn.add(down);

        JButton right = new JButton(">");
        right.setPreferredSize(new Dimension(45,45));
        fifthBtn.add(right);


        TopLabPan.setLayout(new BoxLayout(TopLabPan, BoxLayout.Y_AXIS));

        TopLabPan.add(TopLab);
        TopLabPan.add(BotLab);
        TopFieldPan.add(field);
        FirstRowPan.setLayout(new BoxLayout(FirstRowPan, BoxLayout.X_AXIS));
        FirstRowPan.add(firstBtn);
        firstBtn.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
        SecondRowPan.setLayout(new BoxLayout(SecondRowPan, BoxLayout.X_AXIS));
        SecondRowPan.add(secondBtn);
        secondBtn.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
        ThirdRowPan.setLayout(new BoxLayout(ThirdRowPan, BoxLayout.X_AXIS));
        ThirdRowPan.add(thirdBtn);
        thirdBtn.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
        FourthRowPan.setLayout(new BoxLayout(FourthRowPan, BoxLayout.X_AXIS));
        FourthRowPan.add(fourthBtn);
        fourthBtn.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
        FifthRowPan.setLayout(new BoxLayout(FifthRowPan, BoxLayout.X_AXIS));
        FifthRowPan.add(fifthBtn);
        fifthBtn.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
        FlowLayout flowLayout = (FlowLayout) mainPanel.getLayout();
        flowLayout.setAlignment(FlowLayout.LEFT);
        MainBtnsPan.setLayout(new GridLayout(5, 5, 0, 0));

        MainBtnsPan.add(FirstRowPan);
        MainBtnsPan.add(SecondRowPan);
        MainBtnsPan.add(ThirdRowPan);
        MainBtnsPan.add(FourthRowPan);
        MainBtnsPan.add(FifthRowPan);

        mainPanel.add(TopLabPan);
        mainPanel.add(TopFieldPan);
        mainPanel.add(MainBtnsPan);


        this.add(mainPanel);

        //Space.setSelected(true);
        field.addKeyListener(this);   // important !!!

        this.addKeyListener(this);  // important !!!
        TopFieldPan.addKeyListener(this);   // important !!!

        setTitle("Typing Tutor"); // set the title to the frame
        setSize(710,490); // set the fixed size
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // set to terminate after exit
        setLocationRelativeTo(null); // the pop-up window will be at the center of the screen
        setVisible(true); // make it visible

    } // ends of the constructor

    public void keyPressed(KeyEvent evt)
    {

        if(evt.getKeyChar() == 'a' || evt.getKeyChar() ==  'A')
        {
            Space.setBackground(Color.green);
        }
        else if(evt.getKeyChar() == 'b' || evt.getKeyChar() == 'B')
        {
            Space.setBackground(Color.red);
        }



    }
    public void keyReleased(KeyEvent evt)
    {
        Space.setBackground(null);
    }
    public void keyTyped(KeyEvent evt) {
        String keyPressed = new String(""+evt.getKeyChar()).toLowerCase();
        JButton tmp = buttonMap.get(keyPressed);
        if(null != tmp){
            tmp.doClick();
        }
    }

    public static void main(String[] args) { // start of the main method

        new Keyboard();

    } // ends of main method

} // ends of class