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

#define SENSOR_PIN 14

// MQTT Settings
const char* mqtt_server = "broker.hivemq.com";
char* topic = "BLINDS";

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

WiFiClient espClient;
PubSubClient client(espClient);

int lastMsg = -1;
char msg[30];

void setup() {
  Serial.begin(115200);
  
  connectToWifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  pinMode(SENSOR_PIN, INPUT);
}

void loop() {
  if(!client.connected())
    reconnect();
  client.loop();
  
  delay(100);

  int isRaining = digitalRead(SENSOR_PIN);

  if (lastMsg != isRaining) {
    lastMsg = isRaining;
    sprintf(msg, "%s", encrypt(isRaining ? "1" : "0"));
    Serial.print("Message sent: ");
    Serial.println(msg);

    client.publish(topic, msg);
  }
}

String encrypt(String msg) {
  return msg;
}

void connectToWifi() {
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);

  Serial.print("Connecting to WiFi: ");
  Serial.println(WIFI_SSID);

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

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

void callback(char* topic, byte* payload, unsigned int length) {
  
}

void reconnect() {
  while (!client.connected()) {
    Serial.println("Trying to connect to MQTT ...");
    if (client.connect("ESPClient")) {
      Serial.println("Connected");
      client.subscribe(topic);
    } else {
      Serial.print("Failed, rc=");
      Serial.println(client.state());
      Serial.println("Try again in 5 seconds");
    }
  }
}