#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>

/* WiFi settings */
#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define WIFI_CHANNEL 6 // Defining the WiFi channel speeds up the connection

/* MQTT Broker settings */
#define MQTT_SERVER "fb702150ced94598a78feab2bf086afb.s1.eu.hivemq.cloud"
#define MQTT_USER "delta7197"
#define MQTT_PASSWORD "#Tk8R@9r5h9YHbi"
#define MQTT_PORT 8883

const char* pub_topic = "sensor";
const char* sub_topic = "tandn/97/test";

/* For no secure connection use WiFiClient: <WiFiClient espClient;> instead of WiFiClientSecure */
WiFiClientSecure espClient;
PubSubClient client(espClient);

static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
)EOF";

void setup_wifi() {
  Serial.print("\nConnecting to ");
  Serial.println(WIFI_SSID);

  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);

  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }

  Serial.println("Connected!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void connect_mqtt() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESPClient-"; // Create a random client ID
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      Serial.println("Success!");

      client.subscribe(sub_topic); // subscribe the topics here
      //client.subscribe(command2_topic); // subscribe the topics here
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds"); // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

//================================================ setup
void setup() {
  Serial.begin(9600);
  while (!Serial) delay(1);
  setup_wifi();

  pinMode(BUILTIN_LED, OUTPUT); // Initialize the BUILTIN_LED pin as an output

  espClient.setCACert(root_ca); // Configure TLS/SSL client certificates
  client.setServer(MQTT_SERVER, MQTT_PORT);
  client.setCallback(callback);
}

void loop() {
  if (!client.connected()) connect_mqtt();
  client.loop();

  // ---- example: how to publish sensor values every 5 sec
  // unsigned long now = millis();
  // if (now - lastMsg > 5000) {
  //   lastMsg = now;
  //   sensor1= random(50);       // replace the random value with your sensor value
  //   sensor2= 20+random(80);    // replace the random value  with your sensor value
  //   publishMessage(pub_topic,String(sensor1),true);
  //   publishMessage(sensor2_topic,String(sensor2),true);
  // }
}

/* This callback is called every time we have a message from the broker */
void callback(char* topic, byte* payload, unsigned int length) {
  String incommingMessage = "";
  for (int i = 0; i < length; i++) incommingMessage+=(char)payload[i];
  Serial.println("Message arrived ["+String(topic)+"]"+incommingMessage);

  /* check the incomming message */
  if( strcmp(topic,sub_topic) == 0){
    if (incommingMessage.equals("on")) digitalWrite(BUILTIN_LED, HIGH); // Turn the LED on
    else if (incommingMessage.equals("off")) digitalWrite(BUILTIN_LED, LOW); // Turn the LED off
  }

  //  check for other commands
  /*  else  if( strcmp(topic,command2_topic) == 0){
             if (incommingMessage.equals("1")) {  } // do something else
          }
          */
}



//======================================= publising as string
void publishMessage(const char* topic, String payload , boolean retained){
  if (client.publish(topic, payload.c_str(), true))
    Serial.println("Message publised ["+String(topic)+"]: "+payload);
}