#include "HX711.h"
#include <DHT.h>
#include <WiFi.h>
#include <PubSubClient.h> // Include the MQTT library

#define DHTPIN 22
#define DHTTYPE DHT22 // Type of DHT sensor
#define LDR_PIN 33

// Virtual MQTT Broker Details
const char* mqtt_server = "wokwi-mqtt-broker";
const int mqtt_port = 1883;
const char* mqtt_username = "hajer";
const char* mqtt_password = "123";
const char* ssid = "Wokwi-GUEST";
const char* password =  "";

const char* mqtt_server = "localhost";
WiFiClient espClient;
PubSubClient client(espClient);

HX711 scale;
DHT dht(DHTPIN, DHTTYPE);

uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
typedef struct struct_message {
  char a[32];
} struct_message;
struct_message myData;
esp_now_peer_info_t peerInfo;

void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  Serial.print("\r\nLast Packet Send Status:\t");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}

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

void setup() {
  Serial.begin(9600);
  Serial.println("HX710B Demo with HX711 Library");
  Serial.println("Initializing the scale");
  
  pinMode(LDR_PIN, INPUT);
  scale.begin(26, 27);
  scale.set_scale(2280.f);
  scale.tare();
  dht.begin();
  setup_wifi(); // Connect to WiFi

  client.setServer(mqtt_server, mqtt_port); // Set MQTT broker
  // Optional: set MQTT credentials
  // client.setCredentials(mqtt_username, mqtt_password);

  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  esp_now_register_send_cb(OnDataSent);

  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;
  peerInfo.encrypt = false;

  if (esp_now_add_peer(&peerInfo) != ESP_OK) {
    Serial.println("Failed to add peer");
    return;
  }
}

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

  if (digitalRead(LDR_PIN) == LOW) {
    Serial.println("Light in cargo");
  } else {
    Serial.println("Dark");
  }
  delay(100);

  float load = scale.get_units(10);
  Serial.print("Load: ");
  Serial.print(load, 1);
  Serial.println(" Kg");

  float temperature = dht.readTemperature();

  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  sprintf(myData.a, "%.2f", temperature); // Changed to two decimal places for temperature

  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *)&myData, sizeof(myData));

  if (result == ESP_OK) {
    Serial.println("Sent with success");
  } else {
    Serial.println("Error sending the data");
  }

  delay(5000);
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish("outTopic", "hello world");
      // ... and resubscribe
      client.subscribe("inTopic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}