#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <HX711.h>

const int DHT_PIN = 15;
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; // WiFi SSID
const char* password = "";
const char* mqtt_server = "test.mosquitto.org"; // MQTT broker server address (you can use "mqtt.eclipse.org" as a public broker for testing)
#define DATA_PIN  15
#define CLOCK_PIN 2
HX711 hx711;
long units;
int buzzer = 13;
int statusCode;
int n = 0;
int i;

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float weight = 0;

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.print("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 = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected to MQTT broker");
      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() {
  pinMode(2, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dht.setup(DHT_PIN, DHTesp::DHT22);
  WiFi.mode(WIFI_STA);
  hx711.begin(DATA_PIN, CLOCK_PIN);
  hx711.set_scale(420.0983);
  hx711.tare();
  pinMode(buzzer, OUTPUT);
}

void loop() {
  units = hx711.get_units();
  int v = map(units, 0, 50, 0, 3500);

  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect to WiFi...");
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, password);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected to WiFi.");
  }

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

// `if (digitalRead(BUTTON_PIN) == LOW) { 
  //   // Button is pressed, take some action here //   
  // Add your button action here // if (digitalRead(BUTTON_PIN) == LOW) { //  
   // Button is pressed, take some action here //   
  //  buttonPressed = true; // } 
  //  else if (buttonPressed) { //   
   // Button was pressed, trigger an action //   
   // Add your button action here //   
  //  buttonPressed = false; 
   // Reset the button flag // } // }


  unsigned long now = millis();
  if (now - lastMsg > 2000) { // Publish data command
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity();

    // Simulate weight data (replace this with your actual weight reading logic)
    // weight += 0.1; // Increment the weight value

    if (v > 2500) {
      i = -1;
      tone(buzzer, 1000);
      n = 1;
    } else if (v < 500) {
      i = 0;
      noTone(buzzer);
      n = 2;
    } else {
      i = v;
      noTone(buzzer);
      n = 2;
    }
    Serial.print("Weight: ");
    Serial.println(i);

    // Convert weight to a string
    String weightStr = String(i);

    // Publish weight data to MQTT topic
    if (client.connected()) {
      client.publish("/ThinkIOT/weight", weightStr.c_str());
      Serial.print("Published to MQTT: ");
      Serial.println(weightStr);
    } else {
      Serial.println("MQTT not connected, unable to publish.");
    }
  }
}