#include <LiquidCrystal.h>
#include <DHT.h>

// Pin configuration
#define DHTPIN        PA0
#define DHTTYPE       DHT22
#define LDR_PIN       PA6
#define BUTTON_PIN    PA4
#define LED_PIN       PA2

// LCD: RS, E, D4, D5, D6, D7
LiquidCrystal lcd(PB0, PB1, PB10, PB11, PB12, PB13);
DHT dht(DHTPIN, DHTTYPE);

// Override state
bool overrideActive = false;

void setup() {
  Serial.begin(115200);
  Serial.println("STM32 Sensor System Starting...");

  dht.begin();
  lcd.begin(16, 2);
  lcd.print("Initializing...");

  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Button is active LOW

  delay(2000);
  lcd.clear();
}

void loop() {
  static bool lastButtonState = HIGH;
  bool currentButtonState = digitalRead(BUTTON_PIN);

  // Debounce + toggle override on button press
  if (lastButtonState == HIGH && currentButtonState == LOW) {
    overrideActive = !overrideActive;
    delay(200); // debounce delay
  }
  lastButtonState = currentButtonState;

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int ldrValue = analogRead(LDR_PIN);

  // LED logic
  if (overrideActive) {
    digitalWrite(LED_PIN, LOW); // LED off in override mode
  } else {
    if (temp > 30.0 || ldrValue < 300) {
      digitalWrite(LED_PIN, HIGH); // Alert: high temp or dark
    } else {
      digitalWrite(LED_PIN, LOW);  // Normal
    }
  }

  // Serial output
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" C, Hum: ");
  Serial.print(hum);
  Serial.print(" %, LDR: ");
  Serial.print(ldrValue);
  Serial.print(", Override: ");
  Serial.println(overrideActive ? "ON" : "OFF");

  // LCD output
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temp, 1);
  lcd.print("C H:");
  lcd.print(hum, 0);
  lcd.print("%   ");

  lcd.setCursor(0, 1);
  lcd.print("LDR:");
  lcd.print(ldrValue);
  lcd.print(" ");
  lcd.print(overrideActive ? "OVR:ON " : "OVR:OFF");

  delay(1000);
}