/*
Arduino | coding-help
changing text on OLED screen using buttons
creaxyy — 6/14/24 at 6:03 AM
so, ive never had these type of problems so im very 
confused what to do. Its not any fault of screen or 
buttons, its something with the code. I tried asking 
chat gpt to fix it, but he got it even worse. When this 
button on left got clicked it should change the numer 
for example from 2 to 3. This button on right is supposed
 to do it from 3 to 2. Max number that there is should 
 be 7 and min is 1. Can someone help me?
 */
 
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

const int UP_BTN_PIN = 7;
const int DN_BTN_PIN = 6;

int currentGear = 1;
int oldUpBtn = HIGH;
int oldDnBtn = HIGH;

void setup() {
  Serial.begin(9600);
  pinMode(UP_BTN_PIN, INPUT_PULLUP);
  pinMode(DN_BTN_PIN, INPUT_PULLUP);
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.setTextColor(SSD1306_WHITE, SSD1306_BLACK);
  display.clearDisplay();
  display.display();
  displayCurrentGear();
}

void loop() {
  int upButtonState = digitalRead(UP_BTN_PIN);
  if (upButtonState != oldUpBtn)  {
    oldUpBtn = upButtonState;
    if (upButtonState == LOW) {
      Serial.println("Up button pressed");
      if (currentGear < 7) {
        currentGear++;
        displayCurrentGear();
      }
    }
    delay(20);  // debounce
  }
  int downButtonState = digitalRead(DN_BTN_PIN);
  if (downButtonState != oldDnBtn)  {
    oldDnBtn = downButtonState;
    if (downButtonState == LOW) {
      Serial.println("Down button pressed");
      if (currentGear > 1) {
        currentGear--;
        displayCurrentGear();
      }
    }
    delay(20);
  }
  //Serial.print("Up button state: ");
  //Serial.println(upButtonState);
  //Serial.print("Down button state: ");
  //Serial.println(downButtonState);
}

void displayCurrentGear() {
  display.setTextSize(2);
  display.setCursor(40, 0);
  display.print(F("BIEG:"));

  display.setTextSize(4);
  display.setCursor(55, 30);
  display.print(currentGear);

  display.display();
}