#include <WiFi.h>
#include <ThingSpeak.h>

// WiFi credentials
const char* ssid = "Wokwi-GUEST"; // Replace with your WiFi SSID
const char* pass = "";            // Replace with your WiFi password

// ThingSpeak credentials
unsigned long myChannelNumber = 2887753; // Replace with your ThingSpeak channel number
const char* myWriteAPIKey = "EH7PODUNRPP7LC7H"; // Replace with your ThingSpeak API key

// Pin Definitions
const int pirPin = 4;       // PIR Sensor on GPIO 4
const int trigPin = 12;     // Ultrasonic Sensor Trig on GPIO 12
const int echoPin = 14;     // Ultrasonic Sensor Echo on GPIO 14
const int potPin = 34;      // Potentiometer on GPIO 34 (simulates sound sensor)
const int ldrPin = 35;      // LDR Module A0 on GPIO 35
const int ledPin = 2;       // LED on GPIO 2
const int buzzerPin = 15;   // Buzzer on GPIO 15

// Threshold Values
const int motionThreshold = HIGH;      // PIR detects motion (HIGH)
const int distanceThreshold = 50;      // Ultrasonic distance in cm
const int soundThreshold = 500;        // Sound threshold
const int lightThreshold = 500;        // Light threshold

WiFiClient client;

void setup() {
  Serial.begin(115200);   // Initialize Serial Monitor

  // Initialize pins
  pinMode(pirPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(potPin, INPUT);
  pinMode(ldrPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

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

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read sensor data
  int motion = digitalRead(pirPin);          // PIR Sensor (HIGH = motion detected)
  long distance = getDistance();             // Ultrasonic Sensor (distance in cm)
  int sound = 200;                           // Potentiometer (simulates sound, 0–4095)
  int light = analogRead(ldrPin);            // LDR Module (0–4095, lower = darker)

  // Detect intruder type
  const char* intruderType = detectIntruderType(motion, distance, sound, light);

  // Print sensor values and intruder type to Serial Monitor
  Serial.print("Motion: ");
  Serial.println(motion);
  Serial.print("Distance: ");
  Serial.println(distance);
  Serial.print("Sound: ");
  Serial.println(sound);
  Serial.print("Light: ");
  Serial.println(light);
  Serial.print("Intruder Type: ");
  Serial.println(intruderType);

  // Check for animal intrusion
  if (strcmp(intruderType, "Animal") == 0) {
    digitalWrite(ledPin, HIGH);              // Turn on LED
    tone(buzzerPin, 1000);                   // Activate buzzer
    Serial.println("Animal Intrusion Detected!"); // Print to Serial Monitor
  } else {
    digitalWrite(ledPin, LOW);               // Turn off LED
    noTone(buzzerPin);                       // Deactivate buzzer
  }

  // Send data to ThingSpeak
  ThingSpeak.setField(1, motion);         // Field 1: Motion detection
  ThingSpeak.setField(2, distance);       // Field 2: Distance measurement
  ThingSpeak.setField(3, sound);          // Field 3: Simulated sound level
  ThingSpeak.setField(4, light);          // Field 4: Light intensity
  ThingSpeak.setField(5, (strcmp(intruderType, "Human") == 0) ? 1 : 0); // Field 5: Human (1) or Animal (0)

  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (statusCode == 200) {
    Serial.println("Data sent to ThingSpeak");
  } else {
    Serial.println("Problem writing data. HTTP error code: " + String(statusCode));
  }

  delay(15000); // Wait for 15 seconds before sending the next data
}

// Function to calculate distance using ultrasonic sensor
long getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  long duration = pulseIn(echoPin, HIGH);
  return duration * 0.034 / 2; // Convert duration to distance in cm
}

// Function to detect intruder type (Human or Animal)
const char* detectIntruderType(int motion, long distance, int sound, int light) {
  if (motion == motionThreshold) {
    if (distance < distanceThreshold && sound > soundThreshold && light > lightThreshold) { // Close, loud, and bright
      return "Human";
    } else if (distance >= distanceThreshold && sound <= soundThreshold && light <= lightThreshold) { // Far, quiet, and dark
      return "Animal";
    }
  }
  return "Unknown";
}