#include <WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"

#define DHTPIN 15
#define DHTTYPE DHT22
#define LED 2
#define lightSensorDigitalPin 5 // Connect DO pin of LDR sensor to pin D5 on the ESP32
#define lightSensorAnalogPin 4  // Connect AO pin of LDR sensor to pin D4 on the ESP32

DHT dht(DHTPIN, DHTTYPE);

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength);

#define ORG "sbf3ej"
#define DEVICE_TYPE "abcd"
#define DEVICE_ID "1234"
#define TOKEN "12345678"
String data3;
float h, t;

char server[] = ORG ".messaging.internetofthings.ibmcloud.com";
char publishTopic[] = "iot-2/evt/Data/fmt/json";
char subscribetopic[] = "iot-2/cmd/command/fmt/String";
char authMethod[] = "use-token-auth";
char token[] = TOKEN;
char clientId[] = "d:" ORG ":" DEVICE_TYPE ":" DEVICE_ID;

WiFiClient wifiClient;
PubSubClient client(server, 1883, callback, wifiClient);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(LED, OUTPUT);
  pinMode(lightSensorDigitalPin, INPUT); // Set the digital pin of the LDR sensor as input
  pinMode(lightSensorAnalogPin, INPUT);  // Set the analog pin of the LDR sensor as input
  delay(10);
  Serial.println();
  wificonnect();
  mqttconnect();
}

void loop() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  Serial.print("Temp: ");
  Serial.println(t);
  Serial.print("Humidity: ");
  Serial.println(h);

  int lightValueDigital = digitalRead(lightSensorDigitalPin);
  int lightValueAnalog = analogRead(lightSensorAnalogPin);
  Serial.print("Light Value (Digital): ");
  Serial.println(lightValueDigital);
  Serial.print("Light Value (Analog): ");
  Serial.println(lightValueAnalog);

  if (lightValueDigital == 1) {
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }

  PublishData(t, h, lightValueDigital, lightValueAnalog);
  delay(1000);
  if (!client.loop()) {
    mqttconnect();
  }
}

void PublishData(float temp, float humid, int lightValueDigital, int lightValueAnalog) {
  mqttconnect();
  String payload = "{\"temp\":";
  payload += temp;
  payload += "," "\"Humid\":";
  payload += humid;
  payload += "," "\"LightDigital\":";
  payload += lightValueDigital;
  payload += "," "\"LightAnalog\":";
  payload += lightValueAnalog;
  payload += "}";

  Serial.print("Sending payload: ");
  Serial.println(payload);

  if (client.publish(publishTopic, (char*)payload.c_str())) {
    Serial.println("Publish ok");
  } else {
    Serial.println("Publish failed");
  }
}

void mqttconnect() {
  if (!client.connected()) {
    Serial.print("Reconnecting client to ");
    Serial.println(server);
    while (!client.connect(clientId, authMethod, token)) {
      Serial.print(".");
      delay(500);
    }
    initManagedDevice();
    Serial.println();
  }
}

void wificonnect() {
  Serial.println();
  Serial.print("Connecting to ");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void initManagedDevice() {
  if (client.subscribe(subscribetopic)) {
    Serial.println(subscribetopic);
    Serial.println("Subscribe to cmd OK");
  } else {
    Serial.println("Subscribe to cmd FAILED");
  }
}

void callback(char* subscribetopic, byte* payload, unsigned int payloadLength) {
  Serial.print("Callback invoked for topic: ");
  Serial.println(subscribetopic);

  String data = "";
  for (int i = 0; i < payloadLength; i++) {
    data += (char)payload[i];
  }

  Serial.println("Data: " + data);

  if (data == "1") {
    Serial.println(data);
    digitalWrite(LED, HIGH);
  } else {
    Serial.println(data);
    digitalWrite(LED, LOW);
  }

  data = "";
}