int buttonCount = 8;
int i_buttonId;
boolean menuOpen = true;
int[] menuButtons = {2, 3, 4, 5, 6};

void menu() {
  menuOpen = !menuOpen;
  for (int i = 0; i < menuButtons.length; i++) {
    buttons[menuButtons[i]].active = menuOpen;
  }
}

void initButtons() {
  buttons[0] = new Button(72, 10, "Add Node");
  buttons[1] = new Button(164, 10, "Delete Node");
  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
  buttons[3] = new Button(10, 90, "Save");
  buttons[4] = new Button(10, 130, "Open");
  buttons[5] = new Button(10, 170, "Export Image");
  buttons[6] = new Button(10, 210, "Empty Workspace");
  buttons[7] = new Button(10, 10, "Menu");
  menu();
  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
   buttons[1] = new Button(155, 10, "Löschen");
   buttons[2] = new Button(10, 50, "Farben umkehren");
   buttons[3] = new Button(10, 90, "Speichern");
   buttons[4] = new Button(10, 130, "Öffnen");
   buttons[5] = new Button(10, 170, "Bild Exportieren");
   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
   buttons[7] = new Button(10, 210, "Menü");*/
}

void buttonFunctions(int functionID) {
  switch (functionID) {
    case(0):
    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
    i_selectedNode = nodeCount-1;
    break;
    case(1):
    deleteSelectedNode();
    break;
    case(2):
    darkMode = !darkMode;
    break;
    case(3):
    saveCSV(dataPath("save.csv"));
    selectOutput("Where to save .csv file to?", "saveCSVFile");
    break;
    case(4):
    selectInput("Select csv File", "loadCSVFile");
    break;
    case(5):
    selectOutput("Where to export .png image file to?", "savePNGFile");
    break;
    case(6):
    deleteAll();
    break;
    case(7):
    menu();
    break;
  default:
    break;
  }
}


Button buttons[] = new Button[buttonCount];

class Button {
  int id, x, y, w, h;
  String label;
  boolean active;

  boolean hover() {
    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
  }

  void click() {
    buttonFunctions(id);
  }

  Button(int x_, int y_, String label_) {
    id = i_buttonId;
    i_buttonId++;
    x = x_;
    y = y_ ;
    label = label_;
    w = int(textWidth(label))+18;
    h = 32;
    active = true;
  }

  void display() {
    if (active) {
      stroke(0);
      strokeWeight(1);
      fill(255, 127);
      rect(x, y, w, h, 4);
      fill(0);
      text(label, x+9, y+h/2+5);
    }
  }
}