// From https://randomnerdtutorials.com/esp32-mqtt-publish-subscribe-arduino-ide

#include <WiFi.h>
#include "PubSubClient.h"
#include <TM1637.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "mqttgo.io";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;
const int CLK = 32;
const int DIO = 33;

TM1637 tm(CLK, DIO);

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);

  tm.init();
  tm.set(BRIGHT_TYPICAL);
}

void display (int counter) {
  tm.display(0, (counter / 1000) % 10);
  tm.display(1, (counter / 100) % 10);
  tm.display(2, (counter / 10) % 10);
  tm.display(3, counter % 10);

  counter++;
  if (counter == 10000) {
    counter = 0;
  }
  delay(100);
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
      client.subscribe("mpu6050/num");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    } 
  }
}

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

  if (String(topic) == "mpu6050/num") {
    if(stMessage.toInt() >= 1500 || stMessage.toInt() <= -1500){
      Serial.println("warning");
      digitalWrite(ledPin, HIGH);
    }
    display(stMessage.toInt());
  }
}

void loop() {
  delay(10);
  if (!client.connected()) {
    mqttReconnect();
    digitalWrite(ledPin, LOW);
  }
  client.loop();
}