// Pill dispenser

// Inspired by article "Blink Without Delay"
// https://docs.arduino.cc/built-in-examples/digital/BlinkWithoutDelay

// Inspired by basic usage documentation of GEM library
// https://github.com/Spirik/GEM

#include <EasyButton.h>
#include <BlinkControl.h>

const int longpress_duration = 2000; // time in milliseconds

// use built-in buttons and LEDs when possible
#if defined(ESP32)
// dirty hack: assume that any ESP32 board is a Lilygo T5 V2.2
#define LILYGO_T5_V22
#include "boards.h" // source: https://github.com/lewisxhe/GxEPD/blob/master/src/boards.h
#define HAS_DISPLAY

const byte BUTTON_PIN_MOVE = BUTTON_1;
const byte BUTTON_PIN_SELECT = BUTTON_2;
BlinkControl led(LED_PIN);
#else
const byte BUTTON_PIN_MOVE = 2;
const byte BUTTON_PIN_SELECT = 3;
BlinkControl led(LED_BUILTIN); // pin 13 is built-in LED on many Arduino boards
#endif

// serial port speed
#define BAUDRATE 115200

EasyButton button_move(BUTTON_PIN_MOVE);
EasyButton button_select(BUTTON_PIN_SELECT);

#if defined(HAS_DISPLAY)
#define ENABLE_GxEPD2_GFX 1

#include <GxEPD2_BW.h>
#include <Fonts/FreeMonoBold9pt7b.h>
#include <U8g2_for_Adafruit_GFX.h>

// source: https://github.com/ZinggJM/GxEPD2/blob/master/examples/GxEPD2_Example/GxEPD2_display_selection.h#L192
GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> displayEPaper(GxEPD2_290(EPD_CS, EPD_DC, EPD_RSET, EPD_BUSY));

U8G2_FOR_ADAFRUIT_GFX u8g2Fonts;

#include <GEM_u8g2.h>

// Create variables that will be editable through the menu and assign them initial values
int number = -512;
boolean enablePrint = false;

// Create two menu item objects of class GEMItem, linked to number and enablePrint variables 
GEMItem menuItemInt("Number:", number);
GEMItem menuItemBool("Enable print:", enablePrint);

// Create menu button that will trigger printData() function. It will print value of our number variable
// to Serial monitor if enablePrint is true. We will write (define) this function later. However, we should
// forward-declare it in order to pass to GEMItem constructor
void printData(); // Forward declaration
GEMItem menuItemButton("Print", printData);

// Create menu page object of class GEMPage. Menu page holds menu items (GEMItem) and represents menu level.
// Menu can have multiple menu pages (linked to each other) with multiple menu items each
GEMPage menuPageMain("Main Menu");

// Create menu object of class GEM_u8g2. Supply its constructor with reference to u8g2 object we created earlier
GEM_u8g2 menu(u8g2);
#endif

void setup() {
  Serial.begin(BAUDRATE);
  while (!Serial) {
    ;
  }
  Serial.println();

  button_move.begin();
  button_select.begin();
  button_move.onPressed(onButtonMovePressed);
  button_move.onPressedFor(longpress_duration, onButtonMoveLongpressed);
  button_select.onPressed(onButtonSelectPressed);

  led.begin();
  led.breathe(2000);

  displayEPaper.init(115200, true, 2, false);
  u8g2Fonts.begin(display);

  menu.init();
  setupMenu();
  menu.drawMenu();
}

void loop() {
  led.loop();
  button_move.read();
  button_select.read();
}

#if (ESP32)
IRAM_ATTR // avoid crash e.g. when other code reads SD card
#endif
void onButtonMovePressed() {
    Serial.println("button MOVE clicked");
    led.blink2();
}

#if (ESP32)
IRAM_ATTR // avoid crash e.g. when other code reads SD card
#endif
void onButtonMoveLongpressed() {
    Serial.println("button MOVE long-clicked");
    led.off();
}

#if (ESP32)
IRAM_ATTR // avoid crash e.g. when other code reads SD card
#endif
void onButtonSelectPressed() {
    Serial.println("button SELECT clicked");
    led.on();
}

void setupMenu() {
  // Add menu items to menu page
  menuPageMain.addMenuItem(menuItemInt);
  menuPageMain.addMenuItem(menuItemBool);
  menuPageMain.addMenuItem(menuItemButton);

  // Add menu page to menu and set it as current
  menu.setMenuPageCurrent(menuPageMain);
}

void printData() {
  // If enablePrint flag is set to true (checkbox on screen is checked)...
  if (enablePrint) {
    // ...print the number to Serial
    // Note, there might be some problems w/ displaying Cyrillic characters in Serial monitor,
    // in which case adjusting baud rate may help
    Serial.print("Число: ");
    Serial.println(number);
  } else {
    Serial.println("Печать не разрешена:(");
  }
}