/*

Wiring :
LCD           Arduino
SDA     ---->    A4
SCL     ---->    A5
VCC     ---->    5V
GND     ---->    GND

buzzer  ---->    4
btn_up  ---->    3
btn_down --->    2

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*/


#define btn_up 3
#define btn_down 2
#define buzzer 4
#include <Wire.h> // Required for I2C communication
#include <Adafruit_GFX.h> // Core graphics library
#include <Adafruit_SSD1306.h> // Driver for SSD1306 display

// OLED dimensions (change if you have a different size)
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// For 128x32 OLED, change SCREEN_HEIGHT to 32

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The I2C address is usually 0x3C or 0x3D. Check your module!
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
// For I2C, generally use -1. If your OLED has a RST pin you want to control,
// connect it to an Arduino digital pin (e.g., 4) and change -1 to 4.
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
int count = 0;
unsigned long int last_press = 0;


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

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C is common. Try 0x3D if 0x3C doesn't work.
    Serial.println(F("SSD1306 allocation failed"));
    for (;;) delay(1000); // Don't proceed, loop forever
  }
  pinMode(btn_up, INPUT_PULLUP);
  pinMode(btn_down, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  // Clear the buffer
  display.clearDisplay();

  // Display initial text
  display.setTextSize(1);      // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE); // Draw white text
  display.setCursor(0, 0);     // Start at top-left corner
  display.println(F("Hello, World!"));
  display.display(); // Show initial text

  delay(2000); // Pause for 2 seconds
  display.clearDisplay();
}

void loop() {
  if(millis() <= 6000){
    reset_to_home();
    display.print(F("Count: "));
    count = millis() / 1000;
    display.print(count); // Display seconds since Arduino started
    display.print(" ");   // Delete trailing characters from previous print() commands
  }
  if(!digitalRead(btn_up)){
    if(millis() - last_press >= 250){
      last_press = millis();
      Serial.println("up");
      reset_to_home();
      display.print(F("f: "));
      display.print(++count * 100);      // Increment count THEN print it
      display.print("     ");
      tone(buzzer, count * 100, 250);

    }
  }
  else if(!digitalRead(btn_down)){
    if(millis() - last_press >= 250){
      last_press = millis();
      Serial.println("down");
      reset_to_home();
      display.print(F("f: "));
      if(count < 1){ count = 1; }
      display.print(--count * 100);     // Decrement count THEN print it
      display.print("     ");
      tone(buzzer, count * 100, 250);
    }
  }
  // Update the display with new content
  display.display();
  delay(100); // Small delay to make the counter readable
}


void reset_to_home(){
 // Clear the buffer before drawing new content display.clearDisplay();
  // Display a simple counter
  display.setTextSize(2);      // Use a larger text size
  display.setCursor(0, 0);
  display.setTextColor(WHITE, BLACK);
}