#include <ESP32Servo.h>
Servo doorServo;

// ---------------- PIN DEFINITIONS ----------------
#define LDR_PIN 34
#define TEMP_PIN 35
#define MOTION_PIN 25
#define MODE_PIN 26
#define DOOR_PIN 27

#define LIGHT_LED 18
#define SECURITY_LED 19
#define BUZZER 23
#define SERVO_PIN 21

// ---------------- GLOBAL VARIABLES ----------------

bool securityMode = false;
bool lastModeState = HIGH;
bool doorOpen = false;

unsigned long previousMillis = 0;
unsigned long doorTimer = 0;

const int tempThreshold = 2000;   // adjust in simulation
const int lightThreshold = 0;     // digital (LDR DO)

// ---------------- SETUP ----------------
void setup() {
  ESP32PWM::allocateTimer(0);
  ESP32PWM::allocateTimer(1);
  ESP32PWM::allocateTimer(2);
  ESP32PWM::allocateTimer(3);
  Serial.begin(115200);

  pinMode(LDR_PIN, INPUT);
  pinMode(TEMP_PIN, INPUT);
  pinMode(MOTION_PIN, INPUT_PULLUP);
  pinMode(MODE_PIN, INPUT_PULLUP);
  pinMode(DOOR_PIN, INPUT_PULLUP);

  pinMode(LIGHT_LED, OUTPUT);
  pinMode(SECURITY_LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  doorServo.attach(SERVO_PIN);
  doorServo.write(0); // closed

  Serial.println("System Initialized");
}

// ---------------- MAIN LOOP ----------------
void loop() {
  handleModeSwitch();
  handleLighting();
  handleTemperature();
  handleSecurity();
  handleDoor();
}

// ---------------- MODE SWITCH ----------------
void handleModeSwitch() {
  bool currentState = digitalRead(MODE_PIN);

  if (lastModeState == HIGH && currentState == LOW) {
    securityMode = !securityMode;
    Serial.print("Mode Changed: ");
    Serial.println(securityMode ? "SECURITY MODE" : "NORMAL MODE");
    delay(200); // debounce
  }
  lastModeState = currentState;
}

// ---------------- LIGHT CONTROL ----------------
void handleLighting() {
  int lightValue = digitalRead(LDR_PIN);

  if (lightValue == LOW) { // dark
    digitalWrite(LIGHT_LED, HIGH);
    Serial.println("Light ON (Dark detected)");
  } else {
    digitalWrite(LIGHT_LED, LOW);
  }
}

// ---------------- TEMPERATURE CONTROL ----------------
void handleTemperature() {
  int tempValue = analogRead(TEMP_PIN);

  Serial.print("Temperature Value: ");
  Serial.println(tempValue);

  if (tempValue > tempThreshold) {
    digitalWrite(BUZZER, HIGH);
    Serial.println("High Temp → Cooling ON");
  } else {
    digitalWrite(BUZZER, LOW);
  }
}

// ---------------- SECURITY SYSTEM ----------------
void handleSecurity() {
  int motion = digitalRead(MOTION_PIN);

  if (securityMode && motion == LOW) {
    digitalWrite(SECURITY_LED, HIGH);
    if (!securityMode) {
  digitalWrite(BUZZER, HIGH);
}
    Serial.println("⚠️ INTRUSION DETECTED!");
  } else {
    digitalWrite(SECURITY_LED, LOW);
  }
}

// ---------------- DOOR CONTROL ----------------
void handleDoor() {
  int doorButton = digitalRead(DOOR_PIN);

  if (doorButton == LOW && !doorOpen) {
    Serial.println("Door Opening...");
    doorServo.write(90);
    doorOpen = true;
    doorTimer = millis();
  }

  // Auto close after 3 seconds (NON-BLOCKING)
  if (doorOpen && millis() - doorTimer >= 3000) {
    Serial.println("Door Closing...");
    doorServo.write(0);
    doorOpen = false;
  }
}