//#include <Arduino.h>
#include <U8g2lib.h>



#define BUTTON_LEFT_PIN 3


U8G2_SSD1306_128X64_ALT0_F_HW_I2C u8g2(U8G2_R3, /* reset=*/ U8X8_PIN_NONE);   // same as the NONAME variant, but may solve the "every 2nd line skipped" problem
//U8G2_ST7920_128X64_F_SW_SPI u8g2(U8G2_R0, /* clock=*/ PA5, /* data=*/ PA7, /* CS=*/ PB0, /* reset=*/ U8X8_PIN_NONE);
//U8G2_ST7920_128X64_F_HW_SPI u8g2(U8G2_R0, /* CS=*/ PB0, /* reset=*/ U8X8_PIN_NONE);

const int ledPin = 13;
const int buttonPin = 2;
byte buttonState;

int count = 1;

int incomingByte;

bool Left;
bool clicked_BUTTON_LEFT;

void setup() {
  u8g2.begin();
  Serial.begin(9600);


  pinMode(BUTTON_LEFT_PIN, INPUT_PULLUP);

  pinMode(ledPin, OUTPUT);
}

void loop() {


  if (Left == 1) {
    count++;
    Left = 0;
  }

  if (count > 8) {
    count = 1;
  }


  static uint32_t tmr1;
  if (millis() - tmr1 >= 100) {
    tmr1 = millis();
    u8g2.clearBuffer();



    switch (count) {
      case 1:
        u8g2.setFont(u8g2_font_6x10_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.6x10_tr");
        break;
      case 2:
        u8g2.setFont(u8g2_font_squeezed_r7_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.squeezed_r7_tr");
        break;
      case 3:
        u8g2.setFont(u8g2_font_04b_03_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1324.04b_03_tr");
        break;
      case 4:
        u8g2.setFont(u8g2_font_profont10_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.profont10_tr");
        break;
      case 5:
        u8g2.setFont(u8g2_font_spleen5x8_mr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.spleen5x8_mr");
        break;
      case 6:
        u8g2.setFont(u8g2_font_helvR08_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.helvR08_tr");
        break;
      case 7:
        u8g2.setFont(u8g2_font_ncenR08_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("1234.ncenR08_tr");
        break;
      case 8:
        u8g2.setFont(u8g2_font_timR08_tr);
        u8g2.setCursor(0, 17);
        u8g2.print("123.timR08_tr");
        break;
    }


    

    // ... write something to the buffer
    u8g2.sendBuffer();
  }

  Left = 0;
  if (digitalRead(BUTTON_LEFT_PIN) == LOW && clicked_BUTTON_LEFT == 0) {
    clicked_BUTTON_LEFT = 1;
    Left = 1;
  }


  if (digitalRead(BUTTON_LEFT_PIN) == HIGH && clicked_BUTTON_LEFT == 1) {
    clicked_BUTTON_LEFT = 0;
  }



}