#include <WiFi.h>
#include <PubSubClient.h>
#include "DHTesp.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>


// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2); 

const int LED_PIN = 2;
const int DHT_PIN = 15;

DHTesp dhtSensor;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.mqtt-dashboard.com";

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE	(50)
float temp = 0;
float hum = 0;
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("] ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Switch on the LED if an 1 was received as first character
  if ((char)payload[0] == '1') {
    digitalWrite(2, LOW);   // Turn the LED on (Note that LOW is the voltage level
                            // but actually the LED is on; this is because
                            // it is active low on the ESP-01)
  } else {
    digitalWrite(2, HIGH);  // Turn the LED off by making the voltage HIGH
  }
}



void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish("/d3tt", "Connected");
      // ... and resubscribe
      client.subscribe("/d3tt");
    } 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() {
  // Initialize LCD
  lcd.init();
  // Turn on the backlight
  lcd.backlight();
  // Clear the LCD screen
  lcd.clear();
  // Set the cursor to the first column (0) and first row (0)
  lcd.setCursor(11, 0);
  // Print message to LCD
  lcd.print("Suhu:");
  // Set the cursor to the second row (1) and first column (0)
  lcd.setCursor(0, 0);
  // Print message to LCD
  lcd.print("Lembab:");
  
  pinMode(15, OUTPUT);     // Initialize the BUILTIN_LED pin as an output
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() {

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

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();

    String tempStr = String(data.temperature, 2);
    Serial.print("Temperature: ");
    Serial.println(tempStr);
    client.publish("/d3tt/temp", tempStr.c_str());

    String humStr = String(data.humidity, 1);
    Serial.print("Humidity: ");
    Serial.println(humStr);
    client.publish("/d3tt/hum", humStr.c_str());
    
    // Clear the second row of the LCD
    lcd.setCursor(0, 1);
    lcd.print(humStr + "%"); // Print humidity value
    
    // Set the cursor to the second row (1) and position 11
    lcd.setCursor(11, 1);
    lcd.print(tempStr + "C"); // Print temperature value
  }
}