!7

p-pretty {
  new CirclesAndLines cal;
  Circle a = cal.circle_autoVis("PLAYER", "Chess Player", 0.25, 0.75);
  Circle b = cal.circle_autoVis("PLAYER", "Chess Player", 0.75, 0.75);
  cal.arrow(a, "VS", b);
  cal.circle_autoVis("MAGNUS CARLSEN", 0.25, 0.25);
  cal.circle_autoVis("HIKARU NAKAMURA", 0.75, 0.25);
  Canvas canvas = cal.show(600, 600);
  nu(Thinker, +cal, +canvas).addControls();
}

sclass Thinker {
  double delay = 2; // 2 seconds
  CirclesAndLines cal;
  Canvas canvas;
  JTextArea textArea;
  JButton btnThink, btnStartOver;
  volatile bool thinking;
  S status, initialStatus = "Set up.";
  O think; // func -> bool
  
  void addControls {
    swing {
      addToWindowRight(canvas, withMargin(vstackWithSpacing(
        jMaxWidth(167,
          jMinHeight(180, jscroll(textArea = setFontSize(16, makeBold(wordWrapTypeWriterTextArea()))))),
        btnThink = fatButton(100, "Think!", r { thinkOrStop() }),
        btnStartOver = fatButton(60, "Start over", r { startOver() })
        )));
      status = initialStatus; status();
    }
  }
  
  void startOver {
    // todo
  }
  
  void run {
    repeat {
      sleepSeconds(delay);
      if (thinking) pcall {
        print("Thinking");
        bool t;
        time { t = think(); }
        if (!t) {
          thinking(false);
          print("Done");
        } else {
          print("Updating");
          canvas.update();
        }
      }
    }
  }
  
  void thinking(bool b) {
    thinking = b; status();
    setText(btnThink, b ? "<html><center>Stop<br>thinking</center></html>" : "Think!");
  }
  
  void thinkOrStop {
    thinking(!thinking);
  }
  
  bool think() {
    if (think == null) false;
    cal.lock.lock();
    try {
      ret !isFalse(pcallF(think));
    } finally {
      cal.lock.unlock();
    }
  }
  
  JButton fatButton(int h, S text, O action) {
    JButton btn = jbutton(text, action);
    btn.setFont(sansSerifBold(16));
    ret jMinSize(167, h, btn);
  }
}