#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <WiFi.h>
#include <HTTPClient.h>

// Define the pins for the DHT22 sensor
#define DHTPIN 2  // Replace with the actual pin connected to DHT22
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 16, 2);  // 0x27 is the I2C address of the LCD
const int potPin = 34;  // Replace with the actual pin connected to the potentiometer
const int ledPin = 4;   // Replace with the actual pin connected to the LED

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

void setup() {
  // Initialize the LCD
  lcd.init();
  lcd.backlight();

  // Initialize DHT sensor
  dht.begin();

  // Initialize the LED pin
  pinMode(ledPin, OUTPUT);

  // Connect to Wi-Fi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);
  }
}

void loop() {
  // Read temperature and humidity from the DHT22 sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Read gas value from the potentiometer
  int gasValue = analogRead(potPin);

  // Create JSON payload
  String payload = "{\"temperature\": " + String(temperature) +
                  ", \"humidity\": " + String(humidity) +
                  ", \"gasValue\": " + String(gasValue) + "}";

  // Send data to the webhook
  sendWebhookRequest(payload);

  // Display temperature and humidity on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + " C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: " + String(humidity) + " %");
  delay(2000); // Display temperature and humidity for 2 seconds

  // Display gas level and gas value on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Gas Level: " + getGasLevel(gasValue));
  lcd.setCursor(0, 1);
  lcd.print("Gas Value: " + String(gasValue));
  delay(2000); // Display gas level and value for 2 seconds

  // Control the LED based on air quality
  if (getAirQuality(temperature, humidity, gasValue) == "Bad Air Quality") {
    digitalWrite(ledPin, HIGH); // Turn on the LED
  } else {
    digitalWrite(ledPin, LOW); // Turn off the LED
  }
}

String getGasLevel(int gasValue) {
  if (gasValue >= 0 && gasValue <= 1364) {
    return "Good";
  } else if (gasValue >= 1365 && gasValue <= 2730) {
    return "Normal";
  } else {
    return "Bad";
  }
}

String getAirQuality(float temperature, float humidity, int gasValue) {
  String airLevel;

  if ((temperature >= 22 && temperature <= 30) && (humidity > 30 && humidity < 60)) {
    airLevel = "Good";
  } else if ((temperature >= 30 && temperature <= 40) && (humidity >= 60 && humidity <= 70)) {
    airLevel = "Normal";
  } else {
    airLevel = "Bad";
  }

  String gasLevel = getGasLevel(gasValue);

  if ((airLevel == "Good" || airLevel == "Normal") && (gasLevel == "Good" || gasLevel == "Normal")) {
    return "Good Air Quality";
  } else {
    return "Bad Air Quality";
  }
}

void sendWebhookRequest(String payload) {
  HTTPClient http;

  // Your webhook URL
  const char* webhookUrl = "https://webhook.site/9bfc02ff-9501-4358-ba65-d616bd146f45";

  http.begin(webhookUrl);  // Specify the URL
  http.addHeader("Content-Type", "application/json");  // Specify content-type header

  // Send the POST request
  int httpResponseCode = http.POST(payload);

  // Check for response
  if (httpResponseCode > 0) {
    String response = http.getString();
    Serial.print("HTTP Response code: ");
    Serial.println(httpResponseCode);
    Serial.print("Response: ");
    Serial.println(response);
  } else {
    Serial.print("Error on sending POST request: ");
    Serial.println(httpResponseCode);
  }

  // Free resources
  http.end();
}