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

const int IR_PIN = 14; // IR sensor pin
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient espClient;
PubSubClient client(espClient);

IRrecv irrecv(IR_PIN);
decode_results results;

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

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    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) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "mqttx_c52a4908";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.publish("/ThinkIOT/Publish", "Welcome");
      client.subscribe("/ThinkIOT/Subscribe");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(IR_PIN, INPUT);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  irrecv.enableIRIn(); // Start the IR receiver
}

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

  if (irrecv.decode(&results)) {
    // Publish the received IR code
    char irCodeStr[10];
    sprintf(irCodeStr, "%08X", results.value); // Convert to hex string
    client.publish("/Thinkitive/IRCode", irCodeStr);
    Serial.print("IR Code: ");
    Serial.println(irCodeStr);

    irrecv.resume(); // Receive the next value
  }
}