package class9_Lab_MapperPersonWriter;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.util.Deque;
import java.util.LinkedList;

public class Mapper extends JFrame {

    private final JLabel pictureLabel;
    private Person person;
    private Deque<String> undoStack = new LinkedList<>();

    public static void main(String[] args) {
        new Mapper();
    }

    public Mapper() {
        setSize(500, 400);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        ImageIcon image = new ImageIcon(getClass().getResource("map.png"));
        pictureLabel = new JLabel(image);
        add(pictureLabel);
        // Note: We won't use a layout since we want to manually position the people.

        JPanel innerPanel = new JPanel();
        innerPanel.setLayout(new GridLayout(3, 3));
        pictureLabel.add(innerPanel);
        innerPanel.setLocation(10, 10);

        innerPanel.add(new JPanel()); // empty spot
        JButton upButton = new JButton("^");
        upButton.setActionCommand("up");
        upButton.addActionListener(e->handle(e));
        innerPanel.add(upButton);
        innerPanel.add(new JPanel()); // empty spot

        JButton leftButton = new JButton("<");
        leftButton.setActionCommand("left");
        leftButton.addActionListener(e->handle(e));
        innerPanel.add(leftButton);
        JButton undoButton = new JButton("U");
        undoButton.setActionCommand("undo");
        undoButton.addActionListener(e->handle(e));
        innerPanel.add(undoButton);
        JButton rightButton = new JButton(">");
        rightButton.setActionCommand("right");
        rightButton.addActionListener(e->handle(e));
        innerPanel.add(rightButton);

        innerPanel.add(new JPanel()); // empty spot
        JButton downButton = new JButton("v");
        downButton.setActionCommand("down");
        downButton.addActionListener(e->handle(e));
        innerPanel.add(downButton);
        innerPanel.add(new JPanel()); // empty spot

        generatePerson();

        pack();
        innerPanel.setSize(innerPanel.getPreferredSize());
        setVisible(true);
    }

    private void handle(ActionEvent e) {
        if("up".equals(e.getActionCommand())) {
            person.moveBy(0,-10);
        } else if("down".equals(e.getActionCommand())) {
            person.moveBy(0, 10);
        } else if("left".equals(e.getActionCommand())) {
            person.moveBy(-10,0);
        } else if("right".equals(e.getActionCommand())) {
            person.moveBy(10,0);
        } else if("undo".equals(e.getActionCommand())) {
            /* do nothing -- yet */
        } else {
            System.err.println("Warning: Unrecognized command: "+e.getActionCommand());
        }

        if(!"undo".equals(e.getActionCommand())) {
            undoStack.addLast(e.getActionCommand());
        } else { // undo
            String command = undoStack.pollLast();
            if(command == null) {
                System.err.println("Warning: Could not undo. Empty undo stack");
            } else if("up".equals(command)) {
                person.moveBy(0,10);
            } else if("down".equals(command)) {
                person.moveBy(0, -10);
            } else if("left".equals(command)) {
                person.moveBy(10,0);
            } else if("right".equals(command)) {
                person.moveBy(-10, 0);
            } else {
                System.err.println("Warning: Could not undo. Unrecognized command: "+e.getActionCommand());
            }
        }
    }

    private void generatePerson() {
        person = new Person();
        person.jump(pictureLabel.getPreferredSize().width,
                pictureLabel.getPreferredSize().height);
        pictureLabel.add(person.getDisplayOfMe());
        repaint();
    }
}