OAC-Swing/src/main/java/org/openautonomousconnection/oacswing/component/OACTitleBar.java

/* Author: UnlegitDqrk
 *  Feb. 2 2026
 *  */

package org.openautonomousconnection.oacswing.component;

import lombok.Getter;
import lombok.Setter;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ComponentEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowEvent;

/**
 * Custom title bar with tabs and window control buttons.
 */
public class OACTitleBar extends OACPanel {

    @Getter
    @Setter
    private static int HEIGHT = 42;

    private final OACFrame frame;
    private final OACTabbedPane tabs;

    private Point dragStartOnScreen;
    private Point dragStartFrameLocation;

    /**
     * Creates a title bar for the given frame.
     *
     * @param frame owning frame
     */
    public OACTitleBar(OACFrame frame) {
        super(new BorderLayout());
        this.frame = frame;

        setPreferredSize(new Dimension(1, HEIGHT));
        setBorder(new EmptyBorder(6, 10, 6, 10));

        tabs = createTabs();
        OACPanel left = new OACPanel(new BorderLayout());
        left.setOpaque(false);
        left.add(tabs, BorderLayout.CENTER);

        OACPanel right = createWindowControls();

        add(left, BorderLayout.CENTER);
        add(right, BorderLayout.EAST);

        installDragToMove();
        installDoubleClickMaximize();
    }

    /**
     * Returns the tab component.
     *
     * @return tabbed pane
     */
    public OACTabbedPane getTabs() {
        return tabs;
    }

    /**
     * Adds a new tab.
     *
     * @param title tab title
     * @param panel tab body
     */
    public void addTab(String title, OACPanel panel) {
        tabs.addTab(title, panel);
    }

    private OACTabbedPane createTabs() {
        OACTabbedPane tp = new OACTabbedPane(OACTabbedPane.TOP, OACTabbedPane.SCROLL_TAB_LAYOUT);
        tp.setOpaque(false);

        tp.setFocusable(false);

        return tp;
    }

    private OACPanel createWindowControls() {
        OACPanel p = new OACPanel(new FlowLayout(FlowLayout.RIGHT, 8, 0));
        p.setOpaque(false);

        OACButton min = createTitleButton("—");
        OACButton max = createTitleButton("▢");
        OACButton close = createTitleButton("✕");

        min.addActionListener(e -> frame.setState(Frame.ICONIFIED));
        max.addActionListener(e -> toggleMaximize());
        close.addActionListener(e -> frame.dispatchEvent(new WindowEvent(frame, WindowEvent.WINDOW_CLOSING)));

        p.add(min);
        p.add(max);
        p.add(close);

        return p;
    }

    private OACButton createTitleButton(String text) {
        OACButton b = new OACButton(text);
        b.setFocusable(false);
        b.setBorderPainted(false);
        b.setContentAreaFilled(true);
        b.setOpaque(true);
        b.setBorder(null);
        b.setPreferredSize(new Dimension(42, 28));

        return b;
    }

    private void installDragToMove() {
        MouseAdapter drag = new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                dragStartOnScreen = e.getLocationOnScreen();
                dragStartFrameLocation = frame.getLocation();
            }

            @Override
            public void mouseDragged(MouseEvent e) {
                if (dragStartOnScreen == null || dragStartFrameLocation == null) {
                    return;
                }
                Point now = e.getLocationOnScreen();
                int dx = now.x - dragStartOnScreen.x;
                int dy = now.y - dragStartOnScreen.y;

                if ((frame.getExtendedState() & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH) {
                    return;
                }

                frame.setLocation(dragStartFrameLocation.x + dx, dragStartFrameLocation.y + dy);

                frame.dispatchEvent(new ComponentEvent(e.getComponent(), ComponentEvent.COMPONENT_MOVED));

            }
        };

        addMouseListener(drag);
        addMouseMotionListener(drag);
    }

    private void installDoubleClickMaximize() {
        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton(e)) {
                    toggleMaximize();
                }
            }
        });
    }

    private void toggleMaximize() {
        int state = frame.getExtendedState();
        boolean maximized = (state & Frame.MAXIMIZED_BOTH) == Frame.MAXIMIZED_BOTH;

        if (maximized) {
            frame.setExtendedState(state & ~Frame.MAXIMIZED_BOTH);
        } else {
            frame.setExtendedState(state | Frame.MAXIMIZED_BOTH);
        }

        frame.dispatchEvent(new ComponentEvent(this, ComponentEvent.COMPONENT_RESIZED));
    }
}