// EEE379 Computer System and Multimedia - Project
// Group 4
// Title: Automated Animal Intrusion Detection System
#define BLYNK_TEMPLATE_ID "TMPL6GQ9SvQDT"
#define BLYNK_TEMPLATE_NAME "EEE379"
#define BLYNK_AUTH_TOKEN "mipYwYqqBDrQw-lnvwcpqWlfPIcq9XH-"

#include <Arduino.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <ESP32Servo.h>
#include <BlynkSimpleEsp32.h>
#include <HTTPClient.h>

// Initialize the LCD
LiquidCrystal_I2C lcd(0x27, 20, 4);

//Initialize Pins Configuration
int servoPin1 = 25;
int servoPin2 = 17;
Servo servo1;
Servo servo2;

int ledPin = 26;               // Pin LED is connected to
int piezoBuzzerPin = 13;       // Pin Piezo Buzzer is connected to
int pirSensorPin=12;           // PIN PIR Sensor is connected to
int echo = 18;
int trig = 5;
int seconds = 0;
long duration, distance;

//Setup WiFi
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* auth = BLYNK_AUTH_TOKEN;

//Setup Google Spreadsheet
String Sheet_Script_URL = "https://script.google.com/macros/s/AKfycbxmTxTbqOS44f64TDRIKVui8D8B6jC0DwUcRnJK9Z6VmMRp3sJWvWHiOe0ktnwFyKsNIA/exec";

unsigned long lastTriggerTime = 0;  // Variable to store the last trigger time
const unsigned long triggerCooldown = 5000;  // Cooldown period in milliseconds (e.g., 5 seconds)

int pos = 0;

void ConnectToWiFi()
{
  Serial.print("Connecting to WiFi ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(500);
  }
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void triggerAlarm() {
  //Light up LED in Blynk
  Blynk.virtualWrite(V0, 1);
  Serial.println("Motion Detected");
  Blynk.logEvent("intrusion_alert");
  // Activate buzzer
  digitalWrite(ledPin, HIGH);
  analogWrite(piezoBuzzerPin, 200);
  delay(100);
  analogWrite(piezoBuzzerPin, 25);
  delay(100);

  lcd.setCursor(1, 0);
  lcd.print("Motion");
  lcd.setCursor(8, 0);
  lcd.print("Detected");
  lcd.setCursor(1, 1);
  lcd.print("ACTION TAKEN");
  lcd.setCursor(1, 2);
  lcd.print("Servo Activated");

  for (pos = 0; pos <= 180; pos += 1) {
    servo1.write(pos);
    //delay(15);
    servo2.write(pos);
    delay(15);
  }
  for (pos = 180; pos <= 0; pos += 1) {
    servo1.write(pos);
    servo2.write(pos);
    delay(15);
  }
  Blynk.virtualWrite(V0, 0);
}

long getUltrasonicDistance() {
  // Measure distance
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duration = pulseIn(echo, HIGH);
  distance = (duration / 2) * 0.0346;
  Blynk.virtualWrite(V1, distance);
  return distance;
}

void sendData(String status) {
  HTTPClient http;

  String Send_Data_URL = Sheet_Script_URL + "?sts=write";
  Send_Data_URL += "&motion=" + String(status);
  Send_Data_URL += "&dist=" + String(distance);
  
  Serial.println("Send data to Google Spreadsheet...");
  Serial.print("URL : ");
  Serial.println(Send_Data_URL);

  // Getting response from google sheets.
  if(http.begin(Send_Data_URL)) {
    // Gets the HTTP status code.
    int httpCode = http.GET();
    Serial.print("Server response code: ");
    Serial.println(httpCode);
    http.end();
  }
  else Serial.println("Unable to connect to server");
}

BLYNK_WRITE(V2) {
  int pinValue = param.asInt();

  if(pinValue == 1) {
    triggerAlarm();
    sendData("Manual");
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(ledPin, OUTPUT);            // Declare LED as output
  pinMode(pirSensorPin, INPUT);       // Declare the PIR sensor as input
  pinMode(piezoBuzzerPin, OUTPUT);    // Declare buzzer as output
  Serial.begin(9600);                 // Set serial out if we want debugging
  delay(800);                         // Allow time for the PIR Sensor to calibrate

  ConnectToWiFi();
  Blynk.begin(auth, ssid, password);

  lcd.init();
  lcd.clear();
  lcd.backlight();

  lcd.setCursor(2, 0);
  lcd.print("Distance");

  lcd.setCursor(1, 1);
  lcd.print("UltraSonic");
  delay(2000);

  lcd.clear();
  servo1.attach(servoPin1, 500, 2500);
  servo2.attach(servoPin2,500,2500);
}

void loop() {
  Blynk.run();
  long distance = getUltrasonicDistance();
  lcd.clear();
  lcd.setCursor(3, 3);
  lcd.print(distance);
  lcd.setCursor(6, 3);
  lcd.print("cm");

  // Check for motion
  // Read the PIR sensor
  if (digitalRead(pirSensorPin) == HIGH && distance <= 100) {  // If motion detected and distance is <= 100 cm
    unsigned long currentTime = millis();  // Get the current time
    if (currentTime - lastTriggerTime >= triggerCooldown) {  // Check if cooldown period has passed
      triggerAlarm();
      sendData("Detected");
      lastTriggerTime = currentTime;  // Update the last trigger time
    }
  }
  analogWrite(piezoBuzzerPin, 0);
  digitalWrite(ledPin, LOW);
  delay(100);   //delay to prevent bouncing
}