#include <iclCommon.h>

/// global gui instance
GUI gui;

// Our working thread, calling it's run function 
// asynchronously to the GUI Thread
void run(){
  // shortcut to extract currentTimeLabel from the gui
  gui_LabelHandle(currentTimeLabel);
  currentTimeLabel = Time::now().toString();
  Thread::sleep(1);
}

// a simple callback function of type "void (*callback)(void)"
void exit_callback(void){
  printf("exit callback was called \n");
  exit(0);
}

// another one (we can also access the GUI from here)
void click_callback(){
  gui_LabelHandle(currentTimeLabel);
  currentTimeLabel = "hello!";
}

// a more complex callback implementing the GUI::Callback interface
// In contrast to simple functions, this callbacks are able to have 'own data'
struct MyCallback : public GUI::Callback{
  Time m_lastTime;
  virtual void exec(){
    Time now = Time::now();
    Time dt = now-m_lastTime;

    // here we could use the macro gui_LabelHandle(timeDiffLabel) as well
    gui.getValue<LabelHandle>("timeDiffLabel") = str(dt.toSecondsDouble())+" sec";
    m_lastTime = now;
  }
};

void init(){
  // create some nice components
  gui << "label(something)[@handle=currentTimeLabel@label=current time]"
      << "label(something)[@handle=timeDiffLabel@label=time since last call]"
      << "button(Click me!)[@handle=click]"
      << "button(Click me too!)[@handle=click-2]"
      << "button(Exit!)[@handle=exit]";
  
  
  // create and show the GUI
  gui.show();
  
  /// sometimes, this works as well !
  gui["currentTimeLabel"] = Time::now().toString();
  
  // register callbacks (on the specific handles)
  gui.getValue<ButtonHandle>("exit").registerCallback(new GUI::Callback(exit_callback));
  gui.getValue<ButtonHandle>("click").registerCallback(new GUI::Callback(click_callback));

  // or let gui find the corresponding components internally
  gui.registerCallback(new MyCallback,"click-2");
  
}

int main(int n, char **ppc){
  return ICLApplication(n,ppc,"",init,run).exec();
}