#include <WiFi.h>
#include <WebServer.h>

// WiFi credentials
const char* ssid = "your_ssid";
const char* password = "your_password";

// PIN code for unlocking
const String correctPin = "1234";

// Temperature sensor pin
const int tempPin = 34;

// PIR motion sensor pin
const int pirPin = 12;

// Proximity sensor pins
const int trigPin = 23;
const int echoPin = 22;

// Relay pin for door lock
const int relayPin = 19;

// LED pins
const int ledLightPin = 13; // For light intensity
const int ledDoorPin = 21;   // For door status

// Create a web server object
WebServer server(80);

void setup() {
  Serial.begin(115200);
  
  // Set pin modes
  pinMode(tempPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(ledLightPin, OUTPUT);
  pinMode(ledDoorPin, OUTPUT);
  
  digitalWrite(relayPin, LOW); // Lock door initially

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  // Define web server routes
  server.on("/", handleRoot);
  server.on("/unlock", HTTP_GET, handleUnlock);
  server.begin();
}

void loop() {
  server.handleClient();
  handleTemperatureControl();
  handleMotionDetection();
}

void handleTemperatureControl() {
  int tempValue = analogRead(tempPin); // Read temperature
  int brightness = map(tempValue, 0, 4095, 0, 255); // Map to brightness

  digitalWrite(ledLightPin, brightness); // Set LED brightness based on temperature
  Serial.print("Temperature (analog): ");
  Serial.print(tempValue);
  Serial.print("  Light Intensity: ");
  Serial.println(brightness);
}

void handleMotionDetection() {
  int pirState = digitalRead(pirPin);  // Read motion sensor state

  if (pirState == HIGH) { // If motion is detected
    digitalWrite(ledDoorPin, HIGH); // Turn on door status LED
  } else {
    digitalWrite(ledDoorPin, LOW); // Turn off LED if no motion is detected
  }

  // Check proximity
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration * 0.034) / 2; // Calculate distance in cm

  // If user is within 30 cm, LED on
  if (distance < 30) {
    digitalWrite(ledDoorPin, HIGH); // Turn on LED if close to the door
  } else {
    digitalWrite(ledDoorPin, LOW); // Turn off LED if far
  }
}

void handleRoot() {
  String html = "<h1>Smart Door</h1>";
  html += "<form action=\"/unlock\" method=\"GET\">";
  html += "Enter PIN: <input type=\"text\" name=\"pin\">";
  html += "<input type=\"submit\" value=\"Unlock\">";
  html += "</form>";
  server.send(200, "text/html", html);
}

void handleUnlock() {
  String pin = server.arg("pin");
  if (pin == correctPin) {
    digitalWrite(relayPin, HIGH); // Unlock door
    delay(5000);                   // Keep unlocked for 5 seconds
    digitalWrite(relayPin, LOW);  // Lock door again
    server.send(200, "text/html", "Door Unlocked!");
  } else {
    server.send(200, "text/html", "Incorrect PIN!");
  }
}