package com.hotlert;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Frame extends JFrame {

    private double tempNumbers1 = 0;
    private double tempNumbers2 = 0;

    private byte function = -1;


    private JTextField resultJText;

    public Frame() {

        JButton[] numberButtons = new JButton[10];

        for ( int i = 9; i >= 0; i--) {
            numberButtons[i] = new JButton(Integer.toString(i));
        }

        JButton enterButton     = new JButton("Enter");
        JButton cButton         = new JButton("C");
        JButton multiplyButton  = new JButton("*");
        JButton divideButton    = new JButton("/");
        JButton addButton       = new JButton("+");
        JButton substractButton = new JButton("-");


        resultJText = new JTextField();
            resultJText.setPreferredSize(new Dimension(160, 20));
            resultJText.setBackground(Color.WHITE);
            resultJText.setEnabled(false);
            resultJText.setHorizontalAlignment(4);
            resultJText.setDisabledTextColor(Color.BLACK);


        JPanel motherPanel = new JPanel();
            motherPanel.setLayout(new BoxLayout(motherPanel, BoxLayout.Y_AXIS));

        JPanel textPanel = new JPanel();
            textPanel.setPreferredSize(new Dimension(160, 20));
            textPanel.add(resultJText);

        JPanel numberButtonsPanel = new JPanel();
            numberButtonsPanel.setPreferredSize(new Dimension(160, 100));

            for(int i = 9; i>=0; i--) {
                numberButtonsPanel.add(numberButtons[i]);
            }

        JPanel functionButtonPanel = new JPanel();
            functionButtonPanel.setPreferredSize(new Dimension(160, 35));
            functionButtonPanel.add(enterButton);
            functionButtonPanel.add(cButton);
            functionButtonPanel.add(multiplyButton);
            functionButtonPanel.add(divideButton);
            functionButtonPanel.add(addButton);
            functionButtonPanel.add(substractButton);

        numberButtonsAction[] numberButtonActions = new numberButtonsAction[10];
        for ( int i = 0; i < 10; i++ ) {
            numberButtonActions[i] = new numberButtonsAction(numberButtons[i]);
            numberButtons[i].addActionListener(numberButtonActions[i]);
        }

        EnterButton enter = new EnterButton();
            enterButton.addActionListener(enter);

        CButton c = new CButton();
            cButton.addActionListener(c);

        MultiplyButton multiply = new MultiplyButton();
            multiplyButton.addActionListener(multiply);

        DivideButton divide = new DivideButton();
            divideButton.addActionListener(divide);

        AddButton add = new AddButton();
            addButton.addActionListener(add);

        SubtractButton subtract = new SubtractButton();
            substractButton.addActionListener(subtract);

        motherPanel.add(textPanel);
        motherPanel.add(numberButtonsPanel);
        motherPanel.add(functionButtonPanel);
        add(motherPanel);

        setTitle("ButtonTest");
        setSize(180, 290);
        setLocationByPlatform(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);

    }

    private class numberButtonsAction implements ActionListener {

        private String c;

        public numberButtonsAction(JButton a) {
            this.c = a.getText();
        }

        public void actionPerformed(ActionEvent e) {
            if (!resultJText.getText().equals("0.0")) {
                resultJText.setText(resultJText.getText() + c);
            } else {
                resultJText.setText("");
                actionPerformed(e);
            }
        }
    }

    private class EnterButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            tempNumbers2 = Double.parseDouble(resultJText.getText());

            if (function == 0) {
                resultJText.setText(Double.toString((Math.round((tempNumbers1 / tempNumbers2) * 100)) / 100));
            } else if (function == 1) {
                resultJText.setText(Double.toString(tempNumbers1 * tempNumbers2));
            } else if (function == 2) {
                resultJText.setText(Double.toString(tempNumbers2 + tempNumbers1));
            } else if (function == 3) {
                resultJText.setText(Double.toString(tempNumbers1 - tempNumbers2));
            } else {
                resultJText.setText(String.valueOf(tempNumbers1));
            }
                tempNumbers1 = Double.parseDouble(resultJText.getText());
        }


    }

    private class CButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            resultJText.setText("");
            tempNumbers1 = 0;
            tempNumbers2 = 0;

            function = -1;
        }


    }

    private class DivideButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            if (tempNumbers1 == 0) {
                tempNumbers1 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            } else {
                tempNumbers2 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            }
            function = 0;
        }

    }

    private class MultiplyButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            if (tempNumbers1 == 0) {
                tempNumbers1 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            } else {
                tempNumbers2 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            }
            function = 1;
        }


    }


    private class AddButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            if (tempNumbers1 == 0) {
                tempNumbers1 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            } else {
                tempNumbers2 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            }
            function = 2;
        }

    }

    private class SubtractButton implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            if (tempNumbers1 == 0) {
                tempNumbers1 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            } else {
                tempNumbers2 = Double.parseDouble(resultJText.getText());
                resultJText.setText("");
            }
            function = 3;
        }

    }
}