#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

#include "DHT.h"
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""

#define MQTT_SERVER "broker.hivemq.com"
#define MQTT_PORT 1883
#define TOPIC "dashboard/topic_1"

String Json_Data = "";
WiFiClient client;

Adafruit_MQTT_Client mqtt(&client, MQTT_SERVER, MQTT_PORT);
//Adafruit_MQTT_Subscribe pan_tilt = Adafruit_MQTT_Subscribe(&mqtt, TOPIC);
Adafruit_MQTT_Publish dht22_sensor = Adafruit_MQTT_Publish(&mqtt, TOPIC);

void MQTT_connect() {
    int8_t ret;
    if (mqtt.connected()) {
        return;
    }

    Serial.print("Connecting to MQTT...");
    uint8_t retries = 3;
    while ((ret = mqtt.connect()) != 0) {
        Serial.println(mqtt.connectErrorString(ret));
        Serial.println("Retrying MQTT connection in 5 seconds...");
        mqtt.disconnect();
        delay(5000);
        retries--;
        if (retries == 0) {
            while (1);
        }
    }
    Serial.println("MQTT Connected!");
}

void setup() {
    Serial.begin(115200);
    delay(10);
    Serial.println(); Serial.println();
    Serial.print("Connecting to ");
    Serial.println(WLAN_SSID);

    WiFi.begin(WLAN_SSID, WLAN_PASS);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println();

    Serial.println("WiFi connected");
    Serial.print("IP address: "); Serial.println(WiFi.localIP());

    dht.begin();
    Serial.println();
}

void loop() {
    MQTT_connect();

    float h = dht.readHumidity();
    float t = dht.readTemperature();
    if (isnan(h) || isnan(t)) {
        Serial.println(F("Failed to read from DHT sensor!"));
        return;
    }

    Json_Data = "{ \"temperature\": " + String(t, 2) +
                ", \"humidity\": " + String(h, 2) +
                " }";

    if (!dht22_sensor.publish(Json_Data.c_str())) {
        Serial.println(F("Failed to Publish data..."));
    } else {
        Serial.print("Humidity: ");
        Serial.print(h);
        Serial.println("%\t");
        Serial.print("Temperature: ");
        Serial.print(t);
        Serial.println("°C");
    }
    delay(100); // delay 60 second
}