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


const char* ssid = "Wokwi-GUEST"; //ssid wifi
const char* password = ""; // pass wifi
const char* mqtt_server = "mqtt.telkomiot.id"; //link broker mqtt
//const char* topic_pub = "mqtt://mqtt.telkomiot.id/v2.0/subs/APP668502845056a37361/DEV6685048bdc59967767"; //topik mqtt buat untuk publish data
const int OUT_PIN = 13;//led
// ambil akses key dan token dari broker yang digunakan
String accessKey = "190760c7c967ea94";
String accessToken = "190760c7c966edcd";
String clientID = "DEV66a74ef42890e25989"; //nama device

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;
unsigned long lastsend;
char pesan [50];

void setup_wifi() { //perintah koneksi wifi
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA); //setting wifi chip sebagai station/client
  WiFi.begin(ssid, password); //koneksi ke jaringan wifi

  while (WiFi.status() != WL_CONNECTED) { //perintah tunggu esp32 sampi terkoneksi ke wifi
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

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

void callback(char* topic, byte* payload, unsigned int length) { //perintah untuk menampilkan data ketika esp32 di setting sebagai subscriber
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String messageTemp;
  for (int i = 0; i < length; i++) { //mengecek jumlah data yang ada di topik mqtt
    Serial.print((char)payload[i]); 
    messageTemp += (char)payload[i];
  }
  
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if (messageTemp == "on") {
    digitalWrite(OUT_PIN, HIGH);   // Turn the LED on (Note that LOW is the voltage level
    // but actually the LED is on; this is because
    // it is active low on the ESP-01)
  } else if (messageTemp == "off"){
    digitalWrite(OUT_PIN, LOW);  // Turn the LED off by making the voltage HIGH
  }
}


void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  setup_wifi(); //memanggil void setup_wifi untuk dieksekusi
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Wifi Connected");
  client.setCallback(callback); //perintah menghubungkan ke mqtt broker untuk subscribe data
  client.setServer(mqtt_server, 1883);
}

// void loop() {
//   if(!client.connected()){
//     reconnect();
//   }
//   client.loop();

//   unsigned long currentmillis = millis();

//   if ( currentmillis - lastsend > 10000){
//     sprintf (pesan, "test");
//     client.publish(topic_pub, pesan);
//     lastsend = currentmillis;
//   }
// }

void reconnect() { //perintah koneksi esp32 ke mqtt broker baik itu sebagai publusher atau subscriber
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // perintah membuat client id agar mqtt broker mengenali board yang kita gunakan
    String clientId = "mqtt.telkomiot.id";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientID.c_str(), accessKey.c_str(), accessToken.c_str())) {
      Serial.println("Connected");
     // client.publish(topic_pub, "hello world");
      // Once connected, publish an announcement...
      client.publish("v2.0/pubs/APP668502845056a37361/DEV66a74ef42890e25989", "Ping"); //perintah publish data ke alamat topik yang di setting
      // ... and resubscribe
      client.subscribe("v2.0/pubs/APP668502845056a37361/DEV66a74ef42890e25989"); //perintah subscribe data ke mqtt broker
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds"); 
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

// void reconnect() {
//   while (!client.connected()) {
//     Serial.print("Attempting MQTT connection...");
//     if (client.connect(clientID.c_str(), accessKey.c_str(), accessToken.c_str())) {
//       Serial.println("connected");
//       client.publish(topic_pub, "hello world");
//     }
//     else {
//       Serial.print("failed, rc=");
//       Serial.print(client.state());
//       Serial.println(" try again in 5 seconds");
//       delay(5000);
//     }
//   }
// }

void loop() {
 //soilMoistureValue = analogRead(sensorpin);
 // Serial.println(soilMoistureValue);
  //delay(5000);
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) { //perintah publish data
     //msg = soilMoistureValue.toCharArray()
   ///  int16_t i = analogRead(34);
 // String soilMoitureValue = i < 2165 ? "DRY" : i > 3135 ? "WET" : "OK";
    lastMsg = now;
    ++value;
    snprintf (msg, MSG_BUFFER_SIZE, "Ping #%ld", value); //perintah mempersiapkan data untuk dikirim ke mqtt broker
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish("v2.0/pubs/APP668502845056a37361/DEV66a74ef42890e25989", "hello world");
    client.publish("v2.0/pubs/APP668502845056a37361/DEV66a74ef42890e25989", msg); //perintah publish data ke mqtt broker, yang di publish data dalam variabel msg boleh diubah-ubah
    client.publish("v2.0/pubs/APP668502845056a37361/DEV66a74ef42890e25989", msg);
client.loop();    
  }
}