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

unsigned long delay_time = 120000;
boolean transmissionFlag = 1;

const char* mqtt_server = "broker.emqx.io";
const char* mqtt_topic = "/thing";
const int mqtt_port = 1883;
const char* clientId = "randomwords";

int count = 1; //To find the number of mqtt requests sent

// WiFi and MQTT client initialization
WiFiClient espClient;
PubSubClient mqttClient(espClient);

void setup() {
  Serial.begin(115200);
  WiFi.disconnect();  //Disconnect from previously connected wifi
  Serial.println("\nWifi disconnected");

  delay(100);


  WiFi.mode(WIFI_STA); //STAtion mode:the ESP8266 connects to an access point

  mqttClient.setServer(mqtt_server, mqtt_port);
  connectWifi();
  connectMQTT();
}

void loop() {
  mqttClient.loop();
  getData();
  delay(delay_time);
  }

void connectWifi() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Attempting to connect to WiFi");
    WiFi.begin("Wokwi-GUEST", "");
    while (WiFi.status() != WL_CONNECTED) {
      Serial.println(".");
      delay(1000);
    }
    Serial.println("Wifi Connected");
    return;
  }
}

void getData() {

  double randomDecimal = random(0, 100) / 100.0;
  double temp = random(0, 100) + randomDecimal;
  double humidity = random(0, 100) + randomDecimal;
  Serial.println("----------------");
  Serial.print("Humidity: " + String(humidity) + "% , ");
  Serial.println("Temp: " + String(temp) + "°C");

  // unsigned long currentTime = millis();
  // int time_elapsed = currentTime - lastTransmissionTime;
  // Serial.println("Time elapsed: " + String(time_elapsed));

  StaticJsonDocument<20> doc;
  doc["Humidity"] = humidity;
  doc["Temperature"] = temp;

  // Serialize the JSON object to a string
  String jsonString;
  serializeJson(doc, jsonString);

  sendCommand();
  if (transmissionFlag)
    sendMQTT(jsonString);
  // lastTransmissionTime = currentTime;
  delay_time+=60000;
  // }
}

void connectMQTT() {
  int retryCount = 5;
  while (!mqttClient.connected() && retryCount) {
    Serial.print("Attempting MQTT connection...");
    if (mqttClient.connect(clientId)) {
      Serial.println(" MQTT connected");
      // mqttClient.publish(mqtt_topic, jsonString.c_str());
    } else {
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println(" try again in 2 seconds");
      delay(2000);
      retryCount--;
    }
  }
}

void sendMQTT(String jsonString) {
  if (mqttClient.connected())
    connectMQTT();
  mqttClient.publish(mqtt_topic, jsonString.c_str());
  Serial.println("Sent count: " + String(count++));
}