#define LED_PIN 4
#define buttPin 2
#define buttPin2 16
#define buttPin3 17

unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 44; 

int lastButtState = HIGH;      // Raw physical reading from previous loop
int stabilizedButtState = HIGH; // The clean, debounced button state
bool ledState = false;
bool lastLedState = false;     // Tracks changes to prevent Serial spamming

unsigned long lastSelectDebounceTime = 0;
const unsigned long selectDebounceTime = 57;
int stabilizedSelect = HIGH;

int tempRead = 34;
int currTempValue = 0;

void setup() {
 
 pinMode(LED_PIN, OUTPUT);
 pinMode(buttPin, INPUT_PULLUP);
 Serial.begin(115200);
 Serial.println("======================================================================");
 Serial.println("==================(TEMPERATURE OPERATION PROTOTYPE)===================");
 Serial.println("======================================================================");
}

void loop() {
  int currButtState = digitalRead(buttPin);
  unsigned long currTime = millis();

  // 1. If the physical state changed (due to press or bouncing noise), reset timer
  if (currButtState != lastButtState) {
    lastDebounceTime = currTime;
  }

  // 2. If the button has held its new state longer than our debounce delay...
  if ((currTime - lastDebounceTime) >= debounceDelay) {
    
    // ...and if that state is a brand new stable state...
    if (currButtState != stabilizedButtState) {
      stabilizedButtState = currButtState;

      // ...and if that new stable state is LOW (meaning it was pressed)
      if (stabilizedButtState == LOW) {
        ledState = !ledState; // Safely toggle state
      }
    }
  }
  
  // Save the raw current state for the next loop comparison
  lastButtState = currButtState;   

  // 3. Output physical state 
  if (ledState == true)  {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  // 4. (BLOCK A) ONLY print to Serial if the machine state actually changed
  if (ledState != lastLedState) {
    if (ledState == true) {
      Serial.println("Machine State is ON...");

     } else {
      Serial.println("Machine State is OFF");  // TURNS an LED off state when pressed after by every first press
      Serial.println();
     }
     lastLedState = ledState; // Update previous state tracker
  }

  //  (Block D) for Temperature Reading & Temperature Converter  
  if (ledState == true)  {
   
   
  }
}