#include <Wire.h>

#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display(128, 64, &Wire, -1);

const unsigned char headers [9][256] PROGMEM = {{
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    0x19, 0x99, 0xc3, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x03, 0x30, 0x00, 0x30, 0x0c,
    0x19, 0x99, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x03, 0x30, 0x00, 0x30, 0x0c,
    0x19, 0x99, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x03, 0x30, 0x00, 0x30, 0x0c,
    0x19, 0x99, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x03, 0x30, 0x00, 0x30, 0x0c,
    0x19, 0x99, 0xff, 0x98, 0x18, 0x18, 0x1f, 0xe0, 0x00, 0x00, 0xc3, 0xff, 0x3f, 0xf0, 0x30, 0x0c,
    0x19, 0x99, 0xff, 0x98, 0x18, 0x18, 0x1f, 0xe0, 0x00, 0x00, 0xc3, 0xff, 0x3f, 0xf0, 0x30, 0x0c,
    0x19, 0x99, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x00, 0x00, 0x30, 0x30, 0x0c,
    0x18, 0x19, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x00, 0x00, 0x30, 0x30, 0x0c,
    0x18, 0x19, 0x81, 0x98, 0x18, 0x18, 0x18, 0x00, 0x00, 0x00, 0xc3, 0x00, 0x00, 0x30, 0x30, 0x0c,
    0x18, 0x19, 0x81, 0x98, 0x18, 0x18, 0x18, 0x01, 0xe0, 0x00, 0xc3, 0x00, 0x00, 0x30, 0x30, 0x0c,
    0x18, 0x19, 0x81, 0x98, 0x18, 0x18, 0x18, 0x01, 0xe0, 0x00, 0xc3, 0x00, 0x30, 0x30, 0x30, 0x0c,
    0x18, 0x19, 0x81, 0x98, 0x19, 0xff, 0x98, 0x01, 0xe0, 0x00, 0xf3, 0x00, 0x3f, 0xf3, 0xff, 0x3c,
    0x18, 0x19, 0x81, 0x98, 0x19, 0xff, 0x98, 0x01, 0xe0, 0x00, 0xf3, 0x00, 0x3f, 0xf3, 0xff, 0x3c
  },

  {
    0x01, 0xff, 0x9f, 0xf9, 0xff, 0x80, 0x06, 0x00, 0x7f, 0xe0, 0xf0, 0x7f, 0x80, 0x7e, 0x1c, 0x00,
    0x01, 0xff, 0x9f, 0xf9, 0xff, 0x80, 0x06, 0x00, 0x7f, 0xe1, 0xf8, 0x7f, 0xc0, 0x7e, 0x1c, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x80, 0x00, 0x06, 0x00, 0x60, 0x63, 0x9c, 0x60, 0xe0, 0x66, 0x38, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x80, 0x00, 0x06, 0x00, 0x60, 0x67, 0x0e, 0x60, 0x60, 0x66, 0x38, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x80, 0x00, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x7e, 0x70, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x80, 0x00, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x7e, 0x70, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x80, 0x00, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x00, 0xe0, 0x00,
    0x01, 0xfe, 0x18, 0x19, 0x8f, 0x80, 0x06, 0x00, 0x60, 0x67, 0xfe, 0x60, 0x60, 0x00, 0xe0, 0x00,
    0x01, 0xfe, 0x18, 0x19, 0x8f, 0x80, 0x06, 0x00, 0x60, 0x67, 0xfe, 0x60, 0x60, 0x01, 0xc0, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x81, 0x80, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x01, 0xc0, 0x00,
    0x01, 0x80, 0x18, 0x19, 0x81, 0x80, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x03, 0x9f, 0x80,
    0x01, 0x80, 0x18, 0x19, 0x81, 0x80, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x03, 0x9f, 0x80,
    0x01, 0x80, 0x18, 0x19, 0x81, 0x9e, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0x60, 0x07, 0x19, 0x80,
    0x01, 0x80, 0x18, 0x19, 0x81, 0x9e, 0x06, 0x00, 0x60, 0x66, 0x06, 0x60, 0xe0, 0x07, 0x19, 0x80,
    0x01, 0xff, 0x98, 0x19, 0xff, 0x9e, 0x07, 0xfe, 0x7f, 0xe6, 0x06, 0x7f, 0xc0, 0x0e, 0x1f, 0x80,
    0x01, 0xff, 0x98, 0x19, 0xff, 0x9e, 0x07, 0xfe, 0x7f, 0xe6, 0x06, 0x7f, 0x80, 0x0e, 0x1f, 0x80
  }
};

void setup() {
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
}

void drawHeader(int num) {
  display.fillRect(0, 0, 128, 16, 0);
  display.drawBitmap(0, 0, headers[num], 128, 16, 1);
}

void initNum(byte shift) {
  display.fillRect(shift, 8, 30, 48, 1);
}

void draw0(byte shift) {
  initNum(shift);
  display.fillRect(shift + 6, 14, 18, 36, 0);
}

void draw1(byte shift) {
  display.fillRect(shift + 6, 8, 18, 48, 1);
  display.fillRect(shift + 6, 14, 6, 36, 0);
  display.fillRect(shift + 18, 8, 6, 42, 0);
}

void draw2(byte shift) {
  initNum(shift);
  display.fillRect(shift, 14, 24, 15, 0);
  display.fillRect(shift + 6, 35, 24, 15, 0);
}

void draw3(byte shift) {
  draw0(shift);
  display.fillRect(shift + 6, 29, 18, 6, 1);
  display.fillRect(shift, 14, 6, 36, 0);
}

void draw4(byte shift) {
  draw8(shift);
  display.fillRect(shift + 6, 8, 18, 6, 0);
  display.fillRect(shift, 35, 24, 21, 0);
}

void draw5(byte shift) {
  draw6(shift);
  display.fillRect(shift, 35, 6, 15, 0);
}

void draw6(byte shift) {
  draw8(shift);
  display.fillRect(shift + 24, 14, 6, 15, 0);
}

void draw7(byte shift) {
  draw8(shift);
  display.fillRect(shift, 26, 24, 30, 0);
}

void draw8(byte shift) {
  initNum(shift);
  display.fillRect(shift + 6, 14, 18, 15, 0);
  display.fillRect(shift + 6, 35, 18, 15, 0);
}

void draw9(byte shift) {
  draw8(shift);
  display.fillRect(shift, 35, 6, 15, 0);
}

void drawDigit(byte num, byte shift) {
  switch (num) {
    case 0:
      draw0(shift);
      break;
    case 1:
      draw1(shift);
      break;
    case 2:
      draw2(shift);
      break;
    case 3:
      draw3(shift);
      break;
    case 4:
      draw4(shift);
      break;
    case 5:
      draw5(shift);
      break;
    case 6:
      draw6(shift);
      break;
    case 7:
      draw7(shift);
      break;
    case 8:
      draw8(shift);
      break;
    case 9:
      draw9(shift);
      break;
    default:
      break;
  }
}

void drawNum(short num) {
  if (0 <= num && num <= 9) {
    drawDigit((byte) num, 49);
  }
  else if (10 <= num && num <= 99) {
    drawDigit((byte) num / 10, 33);
    drawDigit((byte) num % 10, 65);
  }
  else if (100 <= num && num <= 999) {
    drawDigit((byte) (num / 100), 17);
    drawDigit((byte) ((num % 100) / 10), 49);
    drawDigit((byte) (num % 10), 81);
  }
  else {
    drawDigit((byte) (num / 1000), 1);
    drawDigit((byte) ((num % 1000) / 100), 33);
    drawDigit((byte) ((num % 100) / 10), 65);
    drawDigit((byte) (num % 10), 97);
  }
}

short curr1, curr2, curr3, curr4;

void loop() {
  drawHeader(2);
  if (2 <= Serial.available()) {
    curr1 = Serial.read();
    curr2 = Serial.read();
  }
  display.clearDisplay();
  drawNum((curr2 << 8) + curr1);
  display.display();

}