#include <PubSubClient.h>
#include <WiFi.h>
#include <DHT.h>
#define DHT_TYPE DHT22

// initial WIFI
const char* ssid = "Wokwi-GUEST";
const char* password = "";
WiFiClient espClient;

// initial MQTT client
const char* mqttServer = "mqtt.netpie.io";
const int mqttPort = 1883;
const char* clientID = "1a29f63e-65e1-4eec-9453-d4843059438c";
const char* mqttUser = "Vc4Bso1ZUXY2twvT9Dj41Gkh7Z9R1NDo";
const char* mqttPassword = "5xbcBUzDEMMXhxNX6ZgKhfZxg7cLpZz6";

const char* topic_pub = "@msg/lab_nodered_ict_kps/weather/data";
const char* topic_sub = "@msg/lab_nodered_ict_kps/command";

// send buffer
String publishMessage;
PubSubClient client(espClient);
const int DHT_PIN = 32;
const int RED_PIN = 12;
const int GREEN_PIN = 14;
const int BLUE_PIN = 27;
DHT dht(DHT_PIN, DHT_TYPE);

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnectNETPIE() {
  // Loop until we're reconnected
  char mqttinfo[80];
  snprintf (mqttinfo, 75, "Attempting MQTT connection at %s:%d (%s/%s)...", mqttServer, mqttPort, mqttUser,
            mqttPassword);
  while (!client.connected()) {
    Serial.println(mqttinfo);
    String clientId = clientID;
    if (client.connect(clientId.c_str(), mqttUser, mqttPassword)) {
      Serial.println("...Connected");
      client.subscribe(topic_sub);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void messageReceivedCallback(char* topic, byte* payload, unsigned int length) {
  char payloadMsg[80];
  Serial.print("Message arrived in topic: ");
  Serial.println(topic);
  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
    payloadMsg[i] = (char) payload[i];
  }
  payloadMsg[length] = '\0'; // put end of string to buffer
  Serial.println();
  Serial.println("-----------------------");
  processMessage(payloadMsg);
}
void processMessage(String recvCommand) {
}
void setColor(int R, int G, int B) {
  analogWrite(RED_PIN, R);
  analogWrite(GREEN_PIN, G);
  analogWrite(BLUE_PIN, B);
}
void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqttServer, mqttPort);
  client.setCallback(messageReceivedCallback);
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  dht.begin();
}
void loop() {
  if (!client.connected()) {
    reconnectNETPIE();
  }
  client.loop();
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println("ERR: fail to read data from DHT sensor...!");
    delay(5000);
    return;
  }
  publishMessage = "{\"data\": {\"temperature\": " + String(t) + ", \"humidity\": " + String(h) + " }}";
  Serial.println(publishMessage);
  client.publish(topic_pub, publishMessage.c_str());
  // color red (R = 255, G = 0, B = 0)
  setColor(255, 0, 0);
  delay(1000); // keep the color 1 second
  // color green (R = 0, G = 255, B = 0)
  setColor(0, 255, 0);
  delay(1000); // keep the color 1 second
  // color blue (R = 0, G = 0, B = 255)
  setColor(0, 0, 255);
}