package com.company;

import javax.swing.*;
import java.awt.*;

class MyList extends JFrame {

    MyList(){
        super("LIST");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());
        setSize(300, 300);

        MyListModel listModel = new MyListModel();
        JList jList = new JList();
        jList.setModel(listModel);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        scrollPane.getViewport().add(jList);

        JTextField inputField = new JTextField();

        add(scrollPane, BorderLayout.CENTER);
        add(inputField, BorderLayout.SOUTH);


        inputField.addActionListener(e -> {
            String rawText = e.getActionCommand();
            handleCommands(rawText, listModel);
            inputField.setText("");
        });

        setVisible(true);

        inputField.requestFocus();
    }

    private void handleCommands(String source, MyListModel listModel) {
        String[] sourceArray = source.split(" ", 2);

        switch (sourceArray[0]){
            case "add" : {
                if(sourceArray.length < 2 || sourceArray[1] == null) return;
                if (listModel.isElementExist(sourceArray[1]))
                    JOptionPane.showMessageDialog(new JFrame(), sourceArray[1] + " already exists.", "Element exist", JOptionPane.WARNING_MESSAGE);
                else listModel.add(sourceArray[1]);
                break;
            }
            case "del" : {
                if(sourceArray.length < 2 || sourceArray[1] == null) return;
                if (listModel.isElementExist(sourceArray[1]))
                    listModel.remove(listModel.getIndexOf(sourceArray[1]));
                else JOptionPane.showMessageDialog(new JFrame(), sourceArray[1] + " not exists.", "Element not exist", JOptionPane.WARNING_MESSAGE);
                break;
            }
            case "quit" : {
                this.dispose();
                break;
            }
            default: {
                JOptionPane.showMessageDialog(new JFrame(), sourceArray[0] + " is not recognized as an internal or external command!", "Unhandled command", JOptionPane.ERROR_MESSAGE);
                break;
            }
        }
    }
}