#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
#include <WiFi.h>
#include <HTTPClient.h> // Add this line to include the HTTPClient library

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define THINGSBOARD_SERVER "http://thingsboard.cloud"
#define TOKEN "il4qjbu4a9s0z8pwewo7"

#define DHTPIN 25
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);
  delay(100);

  // Initialize the OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;)
      ;
  }

  // Initialize the DHT sensor
  dht.begin();

  // Connect to Wi-Fi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  // Wait for the Wi-Fi connection to be established
  delay(1000);
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  float ammonia = 10.5;
  float lightIntensity = 500;
  float windSpeed = 15;
  float CO2 = 100;

  // Print sensor data to serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Ammonia: ");
  Serial.print(ammonia);
  Serial.print(" ppm, Light Intensity: ");
  Serial.print(lightIntensity);
  Serial.print(" lux, Wind Speed: ");
  Serial.print(windSpeed);
  Serial.print(" m/s, Kadar CO2: ");
  Serial.println(CO2);

  // Send sensor data to Thingsboard
  sendDataToThingsboard(temperature, humidity, ammonia, lightIntensity, windSpeed, CO2);

  // Display sensor data on OLED display
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temperature:");
  display.setCursor(0, 10);
  display.print(temperature);
  display.print(" °C");
  display.setCursor(0, 20);
  display.print("Humidity: ");
  display.setCursor(0, 30);
  display.print(humidity);
  display.print(" %");
  display.display();
  
  delay(2000); // Delay for stability
}

void sendDataToThingsboard(float temperature, float humidity, float ammonia, float lightIntensity, float windSpeed, float CO2) {
  WiFiClient client;
  HTTPClient http;

  // Prepare the Thingsboard server URL
  String url = "http://" + String(THINGSBOARD_SERVER) + "/api/v1/" + String(TOKEN) + "/telemetry";

  // Create the data payload
  String data = "{\"temperature\": " + String(temperature) + ", \"humidity\": " + String(humidity) +
                ", \"ammonia\": " + String(ammonia) + ", \"lightIntensity\": " + String(lightIntensity) +
                ", \"windSpeed\": " + String(windSpeed) + ", \"CO2\": " + String(CO2) + "}";

  // Send the HTTP POST request
  http.begin(client, url);
  http.addHeader("Content-Type", "application/json");
  int httpResponseCode = http.POST(data);

  if (httpResponseCode > 0) {
    Serial.print("HTTP Response code: ");
    Serial.println(httpResponseCode);
  } else {
    Serial.print("Error sending data to Thingsboard: ");
    Serial.println(httpResponseCode);
  }

  http.end();
}