package com.ts3client.ui;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Insets;
import java.util.List;

/**
 * Strip of open server connections, shown between the toolbar and the server
 * view. The bar only appears while more than one connection is open; with a
 * single server the client looks exactly as it did before.
 */
final class ServerTabBar extends JPanel {

    interface Listener {
        void selectTab(ServerTab tab);

        void closeTab(ServerTab tab);
    }

    private final Listener listener;

    ServerTabBar(Listener listener) {
        super(new FlowLayout(FlowLayout.LEFT, 3, 2));
        this.listener = listener;
        setBackground(Theme.TOOLBAR_BG);
        setBorder(BorderFactory.createMatteBorder(0, 0, 1, 0, Theme.WINDOW_BG));
        setVisible(false);
    }

    /**
     * @param micTab the connection holding the microphone, marked with an icon
     */
    void rebuild(List<ServerTab> tabs, ServerTab selected, ServerTab micTab) {
        removeAll();
        for (ServerTab tab : tabs) {
            add(buildCell(tab, tab == selected, tab == micTab, tabs.size() > 1));
        }
        setVisible(tabs.size() > 1);
        revalidate();
        repaint();
    }

    private JPanel buildCell(ServerTab tab, boolean selected, boolean hasMic, boolean closable) {
        JPanel cell = new JPanel(new FlowLayout(FlowLayout.LEFT, 0, 0));
        cell.setOpaque(false);

        JToggleButton button = new JToggleButton(tab.title(), hasMic ? Icons.micActive() : null);
        button.setSelected(selected);
        button.setFocusable(false);
        button.setFont(selected ? Theme.UI_BOLD : Theme.UI_FONT);
        button.setMargin(new Insets(2, 8, 2, 8));
        button.setToolTipText(tab.status());
        button.addActionListener(e -> listener.selectTab(tab));
        cell.add(button);

        if (closable) {
            JButton close = new JButton("✕");
            close.setFocusable(false);
            close.setFont(Theme.UI_FONT);
            close.setMargin(new Insets(2, 5, 2, 5));
            // Keep the cell compact but never so small that the glyph is clipped.
            Dimension size = close.getPreferredSize();
            close.setPreferredSize(new Dimension(size.width, button.getPreferredSize().height));
            close.setToolTipText("Close this connection");
            close.addActionListener(e -> listener.closeTab(tab));
            cell.add(close);
        }
        return cell;
    }
}