/**
   ESP32 + DHT22 Example for Wokwi
   
   https://wokwi.com/arduino/projects/322410731508073042
*/
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHTesp.h"
#include <WiFi.h>
#include <DHTesp.h>
#include <WiFi.h>
#include <PubSubClient.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define DHT22_PIN PB1

      const int DHT_PIN = 15;

      DHTesp dhtSensor;

int greenLamp = 27;
int blueLamp = 26;
int redLamp = 25;

DHTesp dht; 

// Update these with values suitable for your network.

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "localhost:1883";

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

void setup_wifi() { //perintah koneksi wifi
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA); //setting wifi chip sebagai station/client
  WiFi.begin(ssid, password); //koneksi ke jaringan wifi

  while (WiFi.status() != WL_CONNECTED) { //perintah tunggu esp32 sampi terkoneksi ke wifi
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
void reconnect() { //perintah koneksi esp32 ke mqtt broker baik itu sebagai publusher atau subscriber
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // perintah membuat client id agar mqtt broker mengenali board yang kita gunakan
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish("/indobot/p/mqtt", "Indobot"); //perintah publish data ke alamat topik yang di setting
      // ... and resubscribe
      client.subscribe("/indobot/p/mqtt"); //perintah subscribe data ke mqtt broker
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
void callback(char* topic, byte* payload, unsigned int length) { //perintah untuk menampilkan data ketika esp32 di setting sebagai subscriber
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) { //mengecek jumlah data yang ada di topik mqtt
    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 setup() {

    pinMode(2, OUTPUT);     // inisialisasi pin 2 / ledbuiltin sebagai output
    Serial.begin(115200);
    setup_wifi(); //memanggil void setup_wifi untuk dieksekusi
    client.setServer(mqtt_server, 1883); //perintah connecting / koneksi awal ke broker
    client.setCallback(callback); //perintah menghubungkan ke mqtt broker untuk subscribe data
    dht.setup(DHT_PIN, DHTesp::DHT22);//inisialiasi komunikasi dengan sensor dht22

    pinMode(greenLamp, OUTPUT);
    pinMode(blueLamp, OUTPUT);
    pinMode(redLamp, OUTPUT);

    dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
      // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
    if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
      Serial.println(F("SSD1306 allocation failed"));
      for(;;); // Don't proceed, loop forever
    }
    display.clearDisplay();
    display.display();
    delay(1000); // Pause for 2 seconds
    display.setTextSize(1);      // Normal 1:1 pixel scale
    display.setTextColor(WHITE); // Draw white text
    display.cp437(true);
    dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
}

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

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

        String temp = String(data.temperature, 2); //membuat variabel temp untuk di publish ke broker mqtt
        client.publish("tempbeck", temp.c_str()); //publish data dari varibel temp ke broker mqtt
        
        String hum = String(data.humidity, 1); //membuat variabel hum untuk di publish ke broker mqtt
        client.publish("/indobot/p/hum", hum.c_str()); //publish data dari varibel hum ke broker mqtt

        Serial.print("Temperature: ");
        Serial.println(temp);
        Serial.print("Humidity: ");
        Serial.println(hum);
      }
    //temp and humidity Input
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();

    data.humidity = 32.00;
    data.temperature = 2.00;

    //Display Output
    display.clearDisplay();
    display.setCursor(1,1);
    display.println("Temp: " + String(data.temperature, 2) + "C");
    display.setCursor(1,10);
    display.println("Humidity: " + String(data.humidity, 1) + "%");
    display.setCursor(1,20);
    display.println("---");
    display.display();

    //Lighting lamps when temp or humidity is critical
    if(data.humidity < 40 or data.humidity > 50 ){
      digitalWrite(greenLamp, HIGH);
    }
    if(data.temperature < 18){
      digitalWrite(blueLamp, HIGH);
    }
    if(data.temperature > 22){
      digitalWrite(redLamp, HIGH);
    }

    delay(1000);

}