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

#define DHTPIN  25
#define pinLDR 34

#define AC  5
#define Humidifier  18
#define Lampu  19


const float GAMMA = 0.7;
const float RL10 = 33;


#define DHTTYPE DHT22

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"; 
const char* username = "";
const char* pass = "";

char str_hum_data[10];
char str_temp_data[10];
char str_ldr_data[8];

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE  (50)
char msg[MSG_BUFFER_SIZE];
int value = 0;
int ac;
int lampu;
int humidifier;
#define sub1 "caesar/room/lampu"
#define sub2 "caesar/room/AC"
#define sub3 "caesar/room/humidifier"

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("] ");

  if (strstr(topic, sub1))  //Button 1
  {
    for (int i = 0; i < length; i++) {
      Serial.print((char)payload[i]);
      int lampu = (char)payload[i];
      if (lampu == '1') {
        digitalWrite(Lampu, HIGH);  // Menyalakan LED
     }else if (lampu == '0') {
        digitalWrite(Lampu, LOW);  // Mematikan LED
      }

    }
    Serial.println();
  }


   if (strstr(topic, sub2))  //Button 2
  {
    for (int i = 0; i < length; i++) {
      Serial.print((char)payload[i]);
      int ac = (char)payload[i];
      if (ac == '1') {
        digitalWrite(AC, HIGH);  // Menyalakan AC
     }else if (ac == '0') {
        digitalWrite(AC, LOW);  // Mematikan AC
      }

    }
    Serial.println();
  }

  if (strstr(topic, sub3))  //Button 3
  {
    for (int i = 0; i < length; i++) {
      Serial.print((char)payload[i]);
      int humidifier = (char)payload[i];
      if (humidifier == '1') {
        digitalWrite(Humidifier, HIGH);  // Menyemprot Humidifier
     }else if (humidifier == '0') {
        digitalWrite(Humidifier, LOW); // Mematikan Humidifier
      }
    }
    Serial.println();
  }
  
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(), username, pass) ) {
      Serial.println("connected");
      client.subscribe(sub1);
      client.subscribe(sub2);
      client.subscribe(sub3);
    } 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() {
  Serial.begin(115200);
  Serial.println("Hello, Caesar");
  pinMode(AC, OUTPUT);
  pinMode(Humidifier, OUTPUT);
  pinMode(Lampu, OUTPUT);
  dht.begin();
  
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}




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

  unsigned long now = millis();

  if (now - lastMsg > 2000) {
    float ldr_data = SensorLDR();
    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, 2, str_hum_data);
    float temp_data = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
    dtostrf(temp_data, 4, 2, str_temp_data);
    dtostrf(ldr_data, 4, 2, str_ldr_data);
    lastMsg = now;
    Serial.println("Publish message: ");
    Serial.print("Temperature:  "); Serial.println(str_temp_data);
    client.publish("caesar/room/suhu", str_temp_data);
    Serial.print("Humidity:  "); Serial.println(str_hum_data);
    client.publish("caesar/room/hum", str_hum_data);
    Serial.print("Lux: "); Serial.println(ldr_data);
    client.publish("caesar/room/ldr", str_ldr_data);
    }

    
}

float SensorLDR() {
  int analogValue = analogRead(pinLDR);
  float voltage = analogValue / 4096. * 3.3;
  float resistance = 2000 * voltage / (1 - voltage / 3.3);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  return lux;
}