#include <WiFi.h>
#include <DHT.h>
#include <HTTPClient.h>
const float GAMMA = 0.7;
const float RL10 = 33;
// DHT22 Pin
#define DHT_PIN 15
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);

// LDR Pin (Analog input)
#define LDR_PIN 32

// LED Pin (Digital output)
#define LED_PIN 18

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

// API URLs
const char *tempApiUrl = "https://afiq-onem2m.site/devices/temperature_0/data";
const char *humiApiUrl = "https://afiq-onem2m.site/devices/humidity_0/data";
const char *lumiApiUrl = "https://afiq-onem2m.site/devices/luminosity_0/data";
const char *lampApiUrl = "https://afiq-onem2m.site/devices/lamp_0/data";

// WiFi connection
void setup() {
  Serial.begin(115200);
  dht.begin();

  // Initialize LED pin
  pinMode(LED_PIN, OUTPUT);

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

// Function to send HTTP POST request
void sendPostRequest(const char *url, String payload) {
  HTTPClient http;
  http.begin(url);
  http.addHeader("Content-Type", "application/json");

  int httpCode = http.POST(payload);
  if (httpCode > 0) {
    String response = http.getString();
    Serial.println("Response: " + response);
  } else {
    Serial.println("Error sending POST request to " + String(url));
  }
  http.end();
}

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

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

  // Read the light level from LDR (analog value)
  int ldrValue = analogRead(LDR_PIN);
    float voltage = ldrValue / 4096. * 3.3;
    float resistance = 2000 * voltage / (1 - voltage / 3.3);
    float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));


  // Print the sensor data to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  Serial.print("LDR Value: ");
  Serial.println(lux);

  // Send temperature data
  String tempJson = String("{\"value\":") + temp + "}";
  sendPostRequest(tempApiUrl, tempJson);

  // Send humidity data
  String humiJson = String("{\"value\":") + humidity + "}";
  sendPostRequest(humiApiUrl, humiJson);

  // Send light intensity (LDR) data
  String lumiJson = String("{\"value\":") + lux + "}";
  sendPostRequest(lumiApiUrl, lumiJson);

  // Send LED status (turn LED on or off based on a simple condition)
  String ledStatus = (lux < 300) ? "true" : "false";  // For example, turn on if light is low
  digitalWrite(LED_PIN, ledStatus == "true" ? HIGH : LOW);
  String lampJson = String("{\"value\":") + ledStatus + "}";
  sendPostRequest(lampApiUrl, lampJson);

  // Print LED status
  Serial.print("LED Status: ");
  Serial.println(ledStatus);

  // Wait 10 seconds before sending the next data
  delay(3000);
}