/* ESP32 WiFi Scanning example */

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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
//const char* mqtt_server = "test.mosquitto.org";
const char* mqtt_server = "broker.mqtt.cool";
WiFiClient espClient;
PubSubClient client(espClient);

//const char* led_red = "kuliah/LED/1";
//const char* led_yellow = "kuliah/LED/2";
//const char* led_green = "kuliah/LED/3";
//const char* led_all_on = "kuliah/LED/9";
//const char* led_all_off = "kuliah/LED/0";

const int pin_red = 19;
const int pin_yellow = 18;
const int pin_green = 5;

void setup() {
  Serial.begin(115200);
  
  pinMode(pin_red, OUTPUT);
  pinMode(pin_yellow, OUTPUT);
  pinMode(pin_green, OUTPUT);
  
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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

void setup_wifi() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi Terhubung...");
  Serial.println("IP Address: ");
  Serial.println(WiFi.localIP());
}

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

  // LED control
  if((char)payload[0] == '1') {
    digitalWrite(pin_red, HIGH);
    digitalWrite(pin_yellow, LOW);
    digitalWrite(pin_green, LOW);
  } else if((char)payload[0] == '2') {
    digitalWrite(pin_red, LOW);
    digitalWrite(pin_yellow, HIGH);
    digitalWrite(pin_green, LOW);
  } else if((char)payload[0] == '3') {
    digitalWrite(pin_red, LOW);
    digitalWrite(pin_yellow, LOW);
    digitalWrite(pin_green, HIGH);
  } else if((char)payload[0] == '9') {
    digitalWrite(pin_red, HIGH);
    digitalWrite(pin_yellow, HIGH);
    digitalWrite(pin_green, HIGH);
  } else if((char)payload[0] == '0') {
    digitalWrite(pin_red, LOW);
    digitalWrite(pin_yellow, LOW);
    digitalWrite(pin_green, LOW);
  }
}

void reconnect() {
  while(!client.connected()) {
    Serial.print("Trying connection to MQTT Server...");
    String clientId = "kuliah-";
    clientId += String(random(0xffff), HEX);
    //Attempt to connect...
    if(client.connect(clientId.c_str())) {
      Serial.println("Connected!");

      // Set API here
      client.subscribe("kuliah/LED");
    } else {
      Serial.println("Failed connection: ");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds.");
      delay(5000);
    }
  }
}