/*
 * Copyright (c) 2008-2019 Emmanuel Dupuy.
 * This project is distributed under the GPLv3 license.
 * This is a Copyleft license that gives the user the right to use,
 * copy and modify the code freely for non-commercial purposes.
 */

package org.jd.gui.service.preferencespanel;

import org.jd.gui.spi.PreferencesPanel;
import org.jd.gui.util.exception.ExceptionUtil;

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import java.awt.*;
import java.util.Map;

public class DirectoryIndexerPreferencesProvider extends JPanel implements PreferencesPanel, DocumentListener {
    protected static final int MAX_VALUE = 30;
    protected static final String MAXIMUM_DEPTH_KEY = "DirectoryIndexerPreferences.maximumDepth";

    protected PreferencesPanel.PreferencesPanelChangeListener listener = null;
    protected JTextField maximumDepthTextField;
    protected Color errorBackgroundColor = Color.RED;
    protected Color defaultBackgroundColor;

    public DirectoryIndexerPreferencesProvider() {
        super(new BorderLayout());

        add(new JLabel("Maximum depth (1.." + MAX_VALUE + "): "), BorderLayout.WEST);

        maximumDepthTextField = new JTextField();
        maximumDepthTextField.getDocument().addDocumentListener(this);
        add(maximumDepthTextField, BorderLayout.CENTER);

        defaultBackgroundColor = maximumDepthTextField.getBackground();
    }

    // --- PreferencesPanel --- //
    @Override public String getPreferencesGroupTitle() { return "Indexer"; }
    @Override public String getPreferencesPanelTitle() { return "Directory exploration"; }
    @Override public JComponent getPanel() { return this; }

    @Override public void init(Color errorBackgroundColor) {
        this.errorBackgroundColor = errorBackgroundColor;
    }

    @Override public boolean isActivated() { return true; }

    @Override public void loadPreferences(Map<String, String> preferences) {
        String preference = preferences.get(MAXIMUM_DEPTH_KEY);

        maximumDepthTextField.setText((preference != null) ? preference : "15");
        maximumDepthTextField.setCaretPosition(maximumDepthTextField.getText().length());
    }

    @Override
    public void savePreferences(Map<String, String> preferences) {
        preferences.put(MAXIMUM_DEPTH_KEY, maximumDepthTextField.getText());
    }

    @Override
    public boolean arePreferencesValid() {
        try {
            int i = Integer.valueOf(maximumDepthTextField.getText());
            return (i > 0) && (i <= MAX_VALUE);
        } catch (NumberFormatException e) {
            assert ExceptionUtil.printStackTrace(e);
            return false;
        }
    }

    @Override
    public void addPreferencesChangeListener(PreferencesPanel.PreferencesPanelChangeListener listener) {
        this.listener = listener;
    }

    // --- DocumentListener --- //
    @Override public void insertUpdate(DocumentEvent e) { onTextChange(); }
    @Override public void removeUpdate(DocumentEvent e) { onTextChange(); }
    @Override public void changedUpdate(DocumentEvent e) { onTextChange(); }

    public void onTextChange() {
        maximumDepthTextField.setBackground(arePreferencesValid() ? defaultBackgroundColor : errorBackgroundColor);

        if (listener != null) {
            listener.preferencesPanelChanged(this);
        }
    }
}