#include <LiquidCrystal_I2C.h>

#define I2C_ADD 0X27
#define COLS 16
#define ROWS 2
#define EN_CLK 2
#define EN_DT 5
#define EN_SW 6
#define TEMP_PIN A0
#define LED 4

int temp;

LiquidCrystal_I2C lcd(I2C_ADD, COLS, ROWS);

// int lastClk = HIGH;
bool tempSet = false;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 5; 
bool ledStatus = false;  // Track LED state

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(EN_CLK, INPUT);
  pinMode(EN_DT, INPUT);
  pinMode(EN_SW, INPUT_PULLUP);
  pinMode(LED, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(EN_CLK), handleEncoder, FALLING);
}

void loop() {
  // put your main code here, to run repeatedly:
  int actTemp = getReading();
  lcd.setCursor(0,0);
  lcd.print("TEMP: "+String(actTemp)+"          ");
  lcd.setCursor(0,1);
  lcd.print("SET: "+String(temp));
  // lcd.setCursor(8, 1);
  // lcd.print("DEACTIVE   ");
  if(digitalRead(EN_SW) == LOW){
    Serial.println("activated");
    tempSet = true;
  }
  if(tempSet){
    if(actTemp < temp && !ledStatus){
      digitalWrite(LED,HIGH);
      ledStatus = true;
      Serial.println("activated");
      lcd.setCursor(8,1);
      lcd.print("ACTIVE     ");
      }
    else if(actTemp >= temp && ledStatus ){
      digitalWrite(LED,LOW);
      ledStatus = false;
      Serial.println("deactivated");
      lcd.setCursor(8,1);
      lcd.print("DEACTIVE   ");
      }
    delay(200);
  }
  delay(50);
}

void handleEncoder() {
    // int newClk = digitalRead(EN_CLK);
    int dtVal = digitalRead(EN_DT);
    unsigned long currentTime = millis();
    if ((currentTime - lastDebounceTime) > debounceDelay) {
      lastDebounceTime = currentTime;
    // if (newClk != lastClk){
    //   lastClk = newClk;
    //   if(newClk == LOW && dtVal == HIGH){
    //     temp++;
    //     Serial.println(temp);
    //   }
    //   if(newClk == LOW && dtVal == LOW){
    //     temp--;
    //     Serial.println(temp);
    //   }
      
    // }
    if (dtVal == HIGH) {
      temp++;  // Clockwise
    } else {
      temp--;  // Counter-clockwise
    }
    Serial.println(temp); 
    }
}

int getReading(){
  const float BETA = 3950; // should match the Beta Coefficient of the thermistor
  int analogValue = analogRead(A0);
  int celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return celsius;
}