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

//Relays for switching appliances
#define Relay1            15     //D15 LED-Orangs = Water-1
#define Relay2            2     //D2   LED-Blue  = Water-2
#define Relay3            19    //D19  LED-Blue   = Motor
#define Relay4            23    //D23  LED-RED    = Fan

//Nenu For Control
int menu;

//Changs to:
#define sub1 "alex9ufo/2025/RELAY"
#define pub1 "alex9ufo/2025/DHT22"

//DHT11 for reading temperature and humidity value
#define DHTPIN            13   //D13  DHTPIN

// Uncomment whatever type you're using! 
#define DHTTYPE DHT22   // DHT 22

DHT dht(DHTPIN, DHTTYPE);

// Update these with values suitable for your network.
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";  // Local IP address of Raspberry Pi
const char* username = "";
const char* pass = "";

char str_hum_data[10];
char str_temp_data[10];

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE  (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;
//===============================================
void setup_wifi() {

  delay(10);
  // We start by connecting to a WiFi network
  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("] ");
  String message="";
  for (int i = 0; i < length; i++) {
    message += (char) payload[i];  // Convert *byte to string
  }
  Serial.print(message);

  if (strstr(topic, sub1))  //Button 1
  {
    if (message == "1on" ) {
        digitalWrite(Relay1, HIGH);  // Turn on the LED 
    }
    if (message == "1off" ) {
        digitalWrite(Relay1, LOW);  // Turn off the LED 
    }    
    if (message == "2on" ) {
        digitalWrite(Relay2, HIGH);  // Turn on the LED 
    }
    if (message == "2off" ) {
        digitalWrite(Relay2, LOW);  // Turn off the LED 
    }  
    if (message == "3on" ) {
        digitalWrite(Relay3, HIGH);  // Turn on the LED 
    }
    if (message == "3off" ) {
        digitalWrite(Relay3, LOW);  // Turn off the LED 
    }    
    if (message == "4on" ) {
        digitalWrite(Relay4, HIGH);  // Turn on the LED 
    }
    if (message == "4off" ) {
        digitalWrite(Relay4, LOW);  // Turn off the LED 
    }  
  }
  else{
    Serial.println("unsubscribed topic");
  }
}
//==============================================================
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(), username, pass) ) {
      Serial.println("connected");
      client.subscribe(sub1);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
//==============================================================
void setup() {
  pinMode(Relay1, OUTPUT);
  pinMode(Relay2, OUTPUT);
  pinMode(Relay3, OUTPUT);
  pinMode(Relay4, OUTPUT);
  Serial.begin(115200);
  dht.begin();
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  client.subscribe(pub1);
}
//==============================================================
void loop() {

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

  unsigned long now = millis();
  if (now - lastMsg > 5000) {
    float hum_data = dht.readHumidity();
    Serial.println(hum_data);
    /* 4 is mininum width, 2 is precision; float value is copied onto str_sensor*/
    dtostrf(hum_data, 4, 1, str_hum_data);
    float temp_data = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
    dtostrf(temp_data, 4, 1, str_temp_data);
    lastMsg = now;
    Serial.println("Publish message: ");
    Serial.print("Temperature:  "); Serial.println(str_temp_data);
    //client.publish("device2/temp", str_temp_data);
    Serial.print("Humidity:  "); Serial.println(str_hum_data);
    //client.publish("device2/hum", str_hum_data);
    String pubStr ,pubStr1 ,pubStr2;
    pubStr1=String(str_temp_data);
    pubStr2=String(str_hum_data);
    pubStr=pubStr1 + "," + pubStr2;

    // Length (with one extra character for the null terminator)
    int pubStr_len = pubStr.length() + 1; 
    // Prepare the character array (the buffer) 
    char char_array[pubStr_len];
    // Copy it over 
    pubStr.toCharArray(char_array, pubStr_len);

    client.publish(pub1, char_array);

  }
}