package zander.ui.album;

import java.awt.Insets;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.KeyEvent;
import java.util.Objects;
import java.awt.Window;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

import zander.library.state.LibraryState;
import zander.ui.UIUtils;
import zander.ui.docs.DocumentationViewer;

public class LibraryPropertyDialog extends JDialog {
    private static final long serialVersionUID = -4761044964061547045L;

    public static final int RESPONSE_CANCEL = 0;
    public static final int RESPONSE_SAVE = 1;

    private final LibraryState library;

    private final JLabel nameLabel;
    private final JTextField nameField;
    private final JButton nameReset;
    private final JLabel licenseLabel;
    private final JTextField licenseField;
    private final JButton licenseReset;
    private final JPanel fieldPanel;
    private final JButton cancelButton;
    private final JButton helpButton;
    private final JButton saveButton;
    private final JPanel buttonPanel;
    private final JPanel content;

    private int response = RESPONSE_CANCEL;

    public LibraryPropertyDialog(Window parent, LibraryState library) {
        super(parent, "Library Properties");
        this.library = library;
        nameLabel = new JLabel("Name:");
        nameField = new JTextField(20);
        nameField.getDocument().addDocumentListener(new DocumentListener(){
            @Override
            public void insertUpdate(DocumentEvent e) { update(); }
            @Override
            public void removeUpdate(DocumentEvent e) { update(); }
            @Override
            public void changedUpdate(DocumentEvent e) { update(); }
            private void update() {
                nameReset.setEnabled(!resetStringEquals(nameField.getText(), library.getOriginalName()));
            }
        });
        nameReset = new JButton("↺");
        nameField.setText(library.getName());
        nameReset.addActionListener((e) -> nameField.setText(library.getOriginalName()));
        licenseLabel = new JLabel("License:");
        licenseField = new JTextField(20);
        licenseField.getDocument().addDocumentListener(new DocumentListener(){
            @Override
            public void insertUpdate(DocumentEvent e) { update(); }
            @Override
            public void removeUpdate(DocumentEvent e) { update(); }
            @Override
            public void changedUpdate(DocumentEvent e) { update(); }
            private void update() {
                licenseReset.setEnabled(!resetStringEquals(licenseField.getText(), library.getOriginalLicense()));
            }
        });
        licenseReset = new JButton("↺");
        licenseField.setText(library.getLicense());
        licenseReset.addActionListener((e) -> licenseField.setText(library.getOriginalLicense()));
        fieldPanel = new JPanel(new GridBagLayout());
        buildFieldUI();
        cancelButton = new JButton("Cancel");
        cancelButton.setMnemonic(KeyEvent.VK_C);
        cancelButton.addActionListener((e) -> dispose());
        helpButton = new JButton("?");
        helpButton.addActionListener((e) -> DocumentationViewer.show(this, "Albums/Library Settings"));
        saveButton = new JButton("Save");
        saveButton.setMnemonic(KeyEvent.VK_S);
        saveButton.addActionListener((e) -> {
                response = RESPONSE_SAVE;
                dispose();
            });
        buttonPanel = new JPanel();
        buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.X_AXIS));
        buttonPanel.add(cancelButton);
        buttonPanel.add(Box.createHorizontalGlue());
        buttonPanel.add(helpButton);
        buttonPanel.add(saveButton);
        content = new JPanel(new BorderLayout());
        content.add(fieldPanel, BorderLayout.CENTER);
        content.add(buttonPanel, BorderLayout.PAGE_END);
        setContentPane(content);
        pack();
        setAlwaysOnTop(true);
        setResizable(false);
        setModalityType(JDialog.DEFAULT_MODALITY_TYPE);
        setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        UIUtils.centerWindow(this, parent);
    }

    private void buildFieldUI() {
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        gbc.insets = new Insets(1, 1, 1, 1);
        gbc.fill = GridBagConstraints.NONE;
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.anchor = GridBagConstraints.LINE_END;
        fieldPanel.add(nameLabel, gbc);
        gbc.gridx = 1;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.CENTER;
        fieldPanel.add(nameField, gbc);
        gbc.gridx = 2;
        gbc.fill = GridBagConstraints.NONE;
        gbc.anchor = GridBagConstraints.LINE_START;
        fieldPanel.add(nameReset, gbc);
        gbc.gridy = 1;
        gbc.gridx = 0;
        gbc.anchor = GridBagConstraints.LINE_END;
        fieldPanel.add(licenseLabel, gbc);
        gbc.gridx = 1;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.CENTER;
        fieldPanel.add(licenseField, gbc);
        gbc.gridx = 2;
        gbc.fill = GridBagConstraints.NONE;
        gbc.anchor = GridBagConstraints.LINE_START;
        fieldPanel.add(licenseReset, gbc);
    }

    public LibraryState getLibrary() {
        return library;
    }

    public int getResponse() {
        return response;
    }

    public String getLibraryName() {
        return nameField.getText();
    }

    public String getLibraryLicense() {
        return licenseField.getText();
    }

    private static boolean resetStringEquals(String s1, String s2) {
        if (s1 != null && s1.isEmpty()) {
            s1 = null;
        }
        if (s2 != null && s2.isEmpty()) {
            s2 = null;
        }
        return Objects.equals(s1, s2);
    }
}