package com.oreilly.javaxp.junit;

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

public class PersonEditorPanel extends JPanel {
    private JTextField firstNameField = new JTextField(20);
    private JTextField lastNameField = new JTextField(20);
    private Person person;

    public PersonEditorPanel() {
        layoutGui();
        updateDataDisplay();
    }

    JTextField getFirstNameField() {
        return this.firstNameField;
    }

    JTextField getLastNameField() {
        return this.lastNameField;
    }

    private void layoutGui() {
        setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        add(new JLabel("First Name:"), gbc);
        add(new JLabel("Last Name:"), gbc);

        gbc.gridx = 1;
        gbc.weightx = 1.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        add(this.firstNameField, gbc);
        add(this.lastNameField, gbc);
    }

    private void updateDataDisplay() {
        if (this.person == null) {
            this.firstNameField.setText("");
            this.lastNameField.setText("");
        } else {
            this.firstNameField.setText(this.person.getFirstName());
            this.lastNameField.setText(this.person.getLastName());
        }
        updateEnabledStates();
    }

    private void updateEnabledStates() {
        if (this.person == null) {
            this.firstNameField.setEnabled(false);
            this.lastNameField.setEnabled(false);
        } else {
            this.firstNameField.setEnabled(true);
            this.lastNameField.setEnabled(true);
        }
    }

    public void setPerson(Person person) {
        this.person = person;
        updateDataDisplay();
    }
}