#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE); // Fast I2C / TWI

int progress = 0;
int up = 3;
int down = 4;
const uint8_t* fonts[] = {u8g_font_7x14B, u8g_font_10x20, u8g_font_chikita};

int currentFontIndex = 0;

void changeFont(int direction);

void setup() {
  u8g2.begin();
  u8g2.clearBuffer();

  u8g2.setColorIndex(1);
  pinMode(up, INPUT_PULLUP);
  pinMode(down, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  int rUp = digitalRead(up);
  int rDown = digitalRead(down);

  if (!rUp) {
    Serial.println("UP");
    changeFont(1); // Change to the next font
    delay(100);
  }

  if (!rDown) {
    Serial.println("Down");
    changeFont(-1); // Change to the previous font
    delay(100);
  }

  u8g2.firstPage();
  do {
    u8g2.setFont(fonts[currentFontIndex]);
    // u8g2.drawStr(0, 50, "Progress Bar");
    // u8g2.drawFrame(0, 0, 128, 64);

    u8g2.setFont(u8g2_font_9x15B_mf);
    int x = centerX("SP.HI");
    u8g2.drawStr(x, 15, "SP.HI");
    //Value
    u8g2.setFont(u8g2_font_9x15_mf);
    x = centerX("2000");
    u8g2.drawStr(x, 15+20+2, "2000");
    //Unit
    u8g2.setFont(u8g2_font_7x13B_mf);
    x = centerX("CMH");
    u8g2.drawStr(x, 15+20+20+2+2, "CMH");
  } while (u8g2.nextPage());

  if (progress < 108) {
    progress++;
  } else {
    progress = 0;
  }
}

int centerX(String text) {
  int x = 128/2 - (u8g2.getStrWidth(text.c_str()) / 2);
  return x;
}

void changeFont(int direction) {
  currentFontIndex += direction;

  // Ensure the index stays within bounds
  if (currentFontIndex < 0) {
    currentFontIndex = sizeof(fonts) / sizeof(fonts[0]) - 1;
  } else if (currentFontIndex >= sizeof(fonts) / sizeof(fonts[0])) {
    currentFontIndex = 0;
  }
}