#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED width,  in pixels
#define SCREEN_HEIGHT 64 // OLED height, in pixels

#define SCROLL_RIGHT_PIN 12
#define SCROLL_LEFT_PIN 13


Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

const unsigned char epd_bitmap_LogoBlock [] PROGMEM = {
	0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 
	0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8
};

const unsigned char epd_bitmap_LeftArrow [] PROGMEM = {
	0x0c, 0x14, 0x24, 0x44, 0x84, 0x84, 0x44, 0x24, 0x14, 0x0c
};

const unsigned char epd_bitmap_RightArrow [] PROGMEM = {
	0xc0, 0xa0, 0x90, 0x88, 0x84, 0x84, 0x88, 0x90, 0xa0, 0xc0
};
// Array of all bitmaps for convenience. (Total bytes used to store images in PROGMEM = 448)
const unsigned char epd_bitmap_ScannerText [] PROGMEM = {
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
	0x00, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0xe1, 0xc7, 0x8f, 0x0e, 0x26, 0x00, 
	0x00, 0x81, 0x12, 0x24, 0x48, 0x91, 0x28, 0x00, 0x00, 0x71, 0x00, 0x24, 0x48, 0x91, 0x30, 0x00, 
	0x00, 0x09, 0x01, 0xe4, 0x48, 0x9f, 0x20, 0x00, 0x00, 0x09, 0x02, 0x24, 0x48, 0x90, 0x20, 0x00, 
	0x00, 0x89, 0x12, 0x24, 0x48, 0x91, 0x20, 0x00, 0x00, 0x70, 0xe1, 0xe4, 0x48, 0x8e, 0x20, 0x00, 
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

const unsigned char epd_bitmap_OptionsText [] PROGMEM = {
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 
	0x00, 0x22, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x22, 0x78, 0xf1, 0x0e, 0x3c, 0x38, 0x00, 
	0x00, 0x22, 0x44, 0x41, 0x11, 0x22, 0x44, 0x00, 0x00, 0x22, 0x44, 0x41, 0x11, 0x22, 0x40, 0x00, 
	0x00, 0x22, 0x44, 0x41, 0x11, 0x22, 0x38, 0x00, 0x00, 0x22, 0x44, 0x41, 0x11, 0x22, 0x04, 0x00, 
	0x00, 0x22, 0x44, 0x41, 0x11, 0x22, 0x44, 0x00, 0x00, 0x1c, 0x78, 0x31, 0x0e, 0x22, 0x38, 0x00, 
	0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00
};
const unsigned char epd_bitmap_ScannerLogo [] PROGMEM = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x80, 0x00, 0x00, 0x00, 0x7f, 
	0xfc, 0x00, 0x00, 0x00, 0x7f, 0xff, 0x80, 0x00, 0x00, 0x03, 0xff, 0xf0, 0x00, 0x00, 0x00, 0x1f, 
	0xf8, 0x00, 0x00, 0x00, 0x01, 0xfc, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x3f, 
	0x80, 0x00, 0x7f, 0x00, 0x1f, 0x80, 0x00, 0x7f, 0xc0, 0x07, 0xe0, 0x00, 0x7f, 0xf0, 0x03, 0xe0, 
	0x00, 0x03, 0xfc, 0x01, 0xf0, 0x00, 0x00, 0xfe, 0x00, 0xf8, 0x00, 0x00, 0x7f, 0x80, 0x78, 0x00, 
	0x00, 0x1f, 0xc0, 0x3c, 0x00, 0x00, 0x07, 0xe0, 0x3c, 0x00, 0x78, 0x03, 0xe0, 0x1e, 0x00, 0x7f, 
	0x01, 0xf0, 0x1e, 0x00, 0x7f, 0xc0, 0xf8, 0x1e, 0x00, 0x1f, 0xe0, 0x78, 0x0f, 0x00, 0x03, 0xf0, 
	0x3c, 0x0f, 0x00, 0x00, 0xf8, 0x3c, 0x07, 0x00, 0x00, 0x78, 0x1e, 0x07, 0x80, 0x00, 0x3c, 0x1e, 
	0x07, 0xc0, 0x00, 0x3c, 0x1f, 0x03, 0xc0, 0x00, 0x1c, 0x0f, 0x03, 0xc0, 0x00, 0x1e, 0x0f, 0x01, 
	0xc0, 0x38, 0x1e, 0x07, 0x81, 0xe0, 0x7c, 0x0e, 0x07, 0x81, 0xe0, 0x7c, 0x0e, 0x03, 0x80, 0xe0, 
	0x7c, 0x0e, 0x03, 0x80, 0xe0, 0x38, 0x0e, 0x03, 0x80, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00
};

const unsigned char epd_bitmap_OptionsLogo [] PROGMEM = {
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00, 0x06, 
	0x03, 0xf0, 0x18, 0x00, 0x0f, 0x03, 0xf0, 0x3c, 0x00, 0x1f, 0x83, 0xf0, 0x7e, 0x00, 0x3f, 0xcf, 
	0xfc, 0xff, 0x00, 0x3f, 0xff, 0xff, 0xff, 0x00, 0x1f, 0xff, 0xff, 0xfe, 0x00, 0x0f, 0xff, 0xff, 
	0xfc, 0x00, 0x07, 0xfe, 0x1f, 0xf8, 0x00, 0x03, 0xf8, 0x07, 0xf0, 0x00, 0x03, 0xf0, 0x03, 0xf0, 
	0x00, 0x07, 0xe0, 0x01, 0xf8, 0x00, 0x07, 0xc0, 0x00, 0xf8, 0x00, 0xff, 0xc0, 0x00, 0xff, 0xc0, 
	0xff, 0x80, 0x00, 0x7f, 0xc0, 0xff, 0x80, 0x00, 0x7f, 0xc0, 0xff, 0x80, 0x00, 0x7f, 0xc0, 0xff, 
	0x80, 0x00, 0x7f, 0xc0, 0x07, 0xc0, 0x00, 0xff, 0xc0, 0x07, 0xc0, 0x00, 0xf8, 0x00, 0x07, 0xe0, 
	0x01, 0xf8, 0x00, 0x03, 0xf0, 0x03, 0xf0, 0x00, 0x03, 0xf8, 0x07, 0xf0, 0x00, 0x07, 0xfe, 0x1f, 
	0xf8, 0x00, 0x0f, 0xff, 0xff, 0xfc, 0x00, 0x1f, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xff, 0xff, 0xff, 
	0x00, 0x3f, 0xcf, 0xfc, 0xff, 0x00, 0x1f, 0x83, 0xf0, 0x7e, 0x00, 0x0f, 0x03, 0xf0, 0x3c, 0x00, 
	0x06, 0x03, 0xf0, 0x18, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00, 0x00, 0x03, 0xf0, 0x00, 0x00
};
const int amountOfOptions = 2;

const unsigned char* optionsTextArray[amountOfOptions] = {
	epd_bitmap_ScannerText,
  epd_bitmap_OptionsText
};

const unsigned char* optionsLogoArray[amountOfOptions] = {
	epd_bitmap_ScannerLogo,
  epd_bitmap_OptionsLogo
};


int optionIndex = 0;

void setup() {
  Serial.begin(9600);

	pinMode(SCROLL_RIGHT_PIN, INPUT);
  // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  oled.setTextSize(1);        
  oled.setTextColor(BLACK);   
	setScreen();        
}

void loop() {
	int scrollRightPinValue = digitalRead(SCROLL_RIGHT_PIN);
	int scrollLeftPinValue = digitalRead(SCROLL_LEFT_PIN);

	if (scrollRightPinValue){
		scrollRight();
		delay(300);
	}else if (scrollLeftPinValue){
		scrollLeft();
		delay(300);
	}
}

void scrollRight(){
	if (optionIndex < amountOfOptions - 1){
		optionIndex = optionIndex + 1;
		setScreen();
	}
}

void scrollLeft(){
	if (optionIndex > 0){
		optionIndex = optionIndex - 1;
		setScreen();
	}
}


void setScreen(){
  oled.clearDisplay(); 
  drawScreenGUIElements();
  drawPositionCursor();
  drawOptionGUI();
  oled.display();       
}


void drawScreenGUIElements() {
  oled.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, WHITE); // Fill the entire screen with white

  if (!(optionIndex == 0)){
    oled.drawBitmap(4, 28, epd_bitmap_LeftArrow, 6, 10, BLACK);
  }

  if (!(optionIndex == amountOfOptions - 1)){
    oled.drawBitmap(119, 28, epd_bitmap_RightArrow, 6, 10, BLACK);
  }

  oled.drawBitmap(34, 5, epd_bitmap_LogoBlock, 62, 46, BLACK);
}

void drawPositionCursor(){
  for (int i = amountOfOptions-1; i >= 0; i--){
    oled.writePixel(125 - i*3, 4, BLACK);

    if (amountOfOptions - 1 - i == optionIndex){
      oled.writePixel(125 - i*3, 3, BLACK);
      oled.writePixel(125 - i*3, 5, BLACK);
      oled.writePixel(125 - i*3 + 1, 3, BLACK);
      oled.writePixel(125 - i*3 + 1, 4, BLACK);
      oled.writePixel(125 - i*3 + 1, 5, BLACK);
      oled.writePixel(125 - i*3 - 1, 3, BLACK);
      oled.writePixel(125 - i*3 - 1, 4, BLACK);
      oled.writePixel(125 - i*3 - 1, 5, BLACK);
    }
  }
}

void drawOptionGUI(){
  oled.drawBitmap(41, 53, optionsTextArray[optionIndex], 64, 12, BLACK);
  oled.drawBitmap(47, 10, optionsLogoArray[optionIndex], 35, 35, BLACK);
}