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

const char* ssid = "ANLI";
const char* password = "Actua1455";

const char* mqtt_server = "broker.emqx.io";
const char* mqtt_Client = "FabAcademy_Colombia_MICHAEL";
const char* mqtt_Topic_Sub = "FabAcademy/week11";

#define LED_BLUE D2     // D2 on XIAO ESP32 C3
#define LED_YELLOW D3   // D3
#define LED_GREEN D4    // D4

WiFiClient espClient;
PubSubClient client(espClient);

int counter = 0;

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void turnOffAll() {
  digitalWrite(LED_BLUE, LOW);
  digitalWrite(LED_YELLOW, LOW);
  digitalWrite(LED_GREEN, LOW);
}

void showLED(int count) {
  turnOffAll();
  if (count == 1) digitalWrite(LED_BLUE, HIGH);
  else if (count == 2) digitalWrite(LED_YELLOW, HIGH);
  else if (count == 3) digitalWrite(LED_GREEN, HIGH);
}

void callback(char* topic, byte* payload, unsigned int length) {
  String msg;
  for (unsigned int i = 0; i < length; i++) {
    msg += (char)payload[i];
  }
  if (msg == "TOUCH") {
    counter++;
    if (counter > 3) counter = 1;
    showLED(counter);
    Serial.print("TOUCH message received. LED: ");
    Serial.println(counter);
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect(mqtt_Client)) {
      Serial.println("connected");
      client.subscribe(mqtt_Topic_Sub);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_BLUE, OUTPUT);
  pinMode(LED_YELLOW, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  turnOffAll();
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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