// Note: renderUIUrl etc are called in Swing thread

// TODO: improve AutoComboBox and put it back in

srecord noeq UIURLSystem(Enterable owner, SimpleLiveValue<S> uiURL) {
  settable bool showHomeButton = true;
  
  // key:   ui URL
  transient Map<S, Entry> uiMap = syncCIMap();
  
  // these are additionally displayed at the top of the list
  // first URL will be shown as "Home" button (if home button is enabled)
  LS preferredURLs = syncList();
  
  sclass Entry {
    S url;
    S toolTip;
    IF0<? extends JComponent> makeComponent;
    
    *(S *url, IF0<? extends JComponent> *makeComponent) {}
    *(S *url, S *toolTip, IF0<? extends JComponent> *makeComponent) {}
  }
  
  settable transient SingleComponentPanel scp;
  JComboBox<S> comboBox;
  transient JButton btnHome;
  
  simplyCached JComponent urlBar() {
    //comboBox = autoComboBox(url(), cloneKeys(uiMap));
    comboBox = jcombobox(urlsForComboBox());
    //centerComboBox(comboBox);
    comboBox.setRenderer(
      new CenteredComboBoxRenderer(
        new ListCellRendererWithToolTip<S>(url -> toolTipForURL(url),
          (ListCellRenderer<S>) comboBox.getRenderer())));
    //comboBoxDynamicToolTip(comboBox, url -> toolTipForURL(url));
    
    onSelectedItem(
      bindComboBoxToLiveValue(comboBox, uiURL),
      url -> showUIURL(url)
    );
    
    Runnable cbAction = comboBoxAction(comboBox, url -> showUIURL(url));
    
    JPanel buttons = jline(jbutton("Go", cbAction));
    
    JComponent panel = withLabel("Show",
      centerAndEastWithMargin(
        comboBox,
        buttons));
        
    if (showHomeButton) {
      S homeURL = homeURL();
      btnHome = jimageButtonScaledToWidth(16, #1103101,
        homeURL != null ? "Go to " + homeURL : "Go to home URL",
        l0 goHome);
      updateHomeButton();
      panel = westAndCenterWithMargin(btnHome, panel);
    }
    
    uiURL.onChange(-> updateHomeButton);
    
    ret panel;
  }
  
  void updateHomeButton {
    setEnabled(btnHome, homeURL != null && !eq(homeURL, url()));
  }
  
  JComponent renderUIUrl aka renderUIURL aka uiGet(S url) {
    try {
      temp tempEnter(owner);
      var entry = uiMap.get(url);
      if (entry == null) ret jCenteredLabel("URL not found: " + url);
      var component = entry.makeComponent!;
      ret component;
    } catch print e {
      ret jErrorView(e);
    }
  }
  
  bool hasURL(S url) { ret uiMap.containsKey(url); }
  
  void showUIURL(S url) {
    temp tempEnter(owner);

    /*LS parts = trimAll(splitAtColon(url));
    for (int n = l(parts); n > 0; n--) {
      url = join(":", takeFirst(n, parts));
      if (hasURL(url)) {
        ...
      }
    }*/
    
    setURL(trim(url));
    go();
  }
  
  void go {
    setComponent(scp, renderUIUrl(url()));
  }
  
  S url() { ret uiURL!; }
  void setURL(S url) { uiURL.set(url); }
  
  selfType put(WithToolTip<S> url, IF0<? extends JComponent> maker) {
    ret put(url!, url.toolTip(), maker);
  }
  
  selfType put(S url, S toolTip default null, IF0<? extends JComponent> maker) {
    uiMap.put(url, new Entry(url, toolTip, maker));
    this;
  }
  
  S toolTipForURL(S url) {
    var e = uiMap.get(url);
    ret e?.toolTip;
  }
    
  LS urlsForComboBox() {
    var sorted = cloneKeys(uiMap);
    ret concatLists(listSetIntersection(preferredURLs, sorted), sorted);
  }
  
  void addPreferredUIURL(S uiURL) {
    preferredURLs.add(uiURL);
  }
  
  S homeURL() { ret first(preferredURLs); }
  
  void goHome { showUIURL(homeURL()); }
}