#include <WiFi.h>
#include <PubSubClient.h>
#include "DHT.h"
#define RELAY 14   //LED PIN
#define DHTPIN 32  //DHT11 PIN
#define DHTTYPE DHT22
//#define LED_PIN 23  //RGB PIN

DHT dht(DHTPIN, DHTTYPE);
//Adafruit_NeoPixel pixels(1, LED_PIN, NEO_GRB + NEO_KHZ800);  //1 are number of LED

const char* ssid = "Wokwi-GUEST";         //SSID  WIFI
const char* password = "";  //PASSWORD  WIFI
const char* mqtt_server = "broker.netpie.io";
const int mqtt_port = 1883;
const char* mqtt_Client = "2ec25fb4-8782-4832-a11e-1e466408688d";  //ClientID
const char* mqtt_username = "9Ec5Vrg5kYYLTtQMCx5Naezkon4Fv6nR";    //Token
const char* mqtt_password = "HFU4G6t7EEexJVmi7AbsGntHEETFLsot";    //Secret

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;
int value = 0;
char msg[100];
String DataString;

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(mqtt_Client, mqtt_username, mqtt_password)) {  //Connect to MQTT BROKER
      Serial.println("connected");
      client.subscribe("@msg/operator");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println("try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String message;
  for (int i = 0; i < length; i++) {
    message = message + char(payload[i]);
  }

  if (String(topic) == "@msg/operator") {
    if (message == "ON") {
      digitalWrite(RELAY, HIGH);
      client.publish("@shadow/data/update", "{\"data\" : {\"led\":1}}");
      Serial.println("LED ON");
      //pixels.setPixelColor(0, pixels.Color(60, 0, 100));
      //pixels.show();
    } else if (message == "OFF") {
      digitalWrite(RELAY, LOW);
      client.publish("@shadow/data/update", "{\"data\" : {\"led\":0}}");
      Serial.println("LED OFF");
      //pixels.setPixelColor(0, pixels.Color(0, 0, 0));
      //pixels.show();
    }
  }
}

void setup() {

  //pixels.begin();
  //pixels.clear();
  Serial.begin(115200);
  pinMode(RELAY, OUTPUT);
  dht.begin();

  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);  //Connect WIFI
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());            //connect WIFI success show ---> IP
  client.setServer(mqtt_server, mqtt_port);  //Define MQTT BROKER, PORT used.
  client.setCallback(callback);              //Set the function that will run when data comes in through Subscribe
  client.subscribe("@msg/operator");
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  long now = millis();
  if (now - lastMsg > 5000) {  //Timer transmits data every 5 seconds
    lastMsg = now;
    ++value;
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    float ldr = analogRead(36);

    DataString = "{\"data\" : \"temperature\" : " + (String)t + ", \"humidity\" : " + (String)h + ", \"ldr\" : " + (String)ldr + "}";
    // Example of data : {"data":{"temperature":25 , "humidity": 60, "led": 50 }}

    DataString.toCharArray(msg, 100);

    Serial.println("Hello NETPIE2020");
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("@shadow/data/update", msg);  //Sent Data ----> Real Time Database (Shadow)
  }
  delay(1);
}