#include <WiFi.h>
#include <HTTPClient.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
#include "DHT.h"

// DHT22 sensor configuration
#define DHTPIN 4 // Pin connected to DHT22
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Ultrasonic sensor configuration
#define TRIG_PIN 2 // Trigger pin
#define ECHO_PIN 5 // Echo pin

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Google Apps Script Web App URL
const char* serverName = "https://script.google.com/macros/s/AKfycbzEFD1myl1Ke0p9pW_zJz44TfuzuHoiUSnK2rSYn3viwGgROjwCaQszbx400ogeZOrL/exec";

// Initialize WiFi and NTP client
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 7200, 10); // UTC+2 timezone, updates every 10 seconds

void setup() {
  Serial.begin(115200);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize DHT22 sensor
  dht.begin();

  // Initialize NTP client
  timeClient.begin();
  timeClient.update();

  // Configure ultrasonic sensor pins
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

float getDistance() {
  // Send a 10-microsecond pulse to the trigger pin
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Measure the duration of the echo pulse
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate distance in centimeters (speed of sound = 34300 cm/s)
  float distance = (duration * 0.034) / 2; // Divide by 2 for round-trip time
  return distance;
}

String getRecommendation(float temperature, float humidity) {
  String recommendation = "";

  // Temperature thresholds (WHO suggests indoor temperature between 18°C and 24°C for comfort)
  if (temperature < 18) {
    recommendation += "Temperature too low! Consider heating the room. ";
  } else if (temperature > 24) {
    recommendation += "Temperature too high! Consider cooling the room. ";
  }

  // Humidity thresholds (Recommended range: 30% to 60%)
  if (humidity < 30) {
    recommendation += "Humidity too low! Consider using a humidifier. ";
  } else if (humidity > 60) {
    recommendation += "Humidity too high! Consider using a dehumidifier. ";
  }

  return recommendation;
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) { // Check if connected to WiFi
    HTTPClient http;
    http.begin(serverName);
    http.addHeader("Content-Type", "application/json");

    // Fetch time from NTP client
    timeClient.update();
    String formattedTime = timeClient.getFormattedTime();

    // Read data from DHT22 sensor
    float humidity = dht.readHumidity();
    float temperature = dht.readTemperature();

    // Check if the DHT sensor data is valid
    if (isnan(humidity) || isnan(temperature)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }

    // Get distance from ultrasonic sensor
    float distance = getDistance();

    // Get recommendations based on temperature and humidity
    String recommendation = getRecommendation(temperature, humidity);

    // Print sensor data to Serial Monitor for debugging
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.print(" %, Distance: ");
    Serial.print(distance);
    Serial.println(" cm");
    if (recommendation != "") {
      Serial.println("Recommendation: " + recommendation);
    }

    // Prepare JSON payload
    String jsonData = "{\"method\":\"append\", \"temperature\":" + String(temperature) +
                      ", \"humidity\":" + String(humidity) +
                      ", \"timestamp\":\"" + formattedTime + "\"" +
                      ", \"distance\":" + String(distance) +
                      ", \"recommendation\":\"" + recommendation + "\"}";

    // Send HTTP POST request
    int httpResponseCode = http.POST(jsonData);

    // Handle HTTP response
    if (httpResponseCode > 0) {
      String response = http.getString();
      Serial.println("HTTP Response Code: " + String(httpResponseCode));
      Serial.println("Response: " + response);
    } else {
      Serial.println("Error sending POST: " + String(httpResponseCode));
    }

    http.end(); // Close HTTP connection
  } else {
    Serial.println("WiFi Disconnected");
  }

  delay(10000); // Delay 10 seconds before sending the next request
}