#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#include <LiquidCrystal_I2C.h>

//SDA 21, SCL22
const int DHT_PIN = 15; // DHT22 sensor GPIO Pin
const char* WIFI_NAME = "Wokwi-GUEST"; // WiFi SSID
const char* WIFI_PASSWORD = ""; // WiFI Password
const int myChannelNumber = 2973878 ; // ThingSpeak channel number
const char* myApiKey = "TP7Z4X6M4QD6IIPB"; // ThingSpeak API key
const char* server = "api.thingspeak.com"; // ThingSpeak server address

float suhu;
//Menuliskan alamat I2C LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

//deklarasi waktu untuk reconnect wifi
unsigned long previousMillis = 0;
const unsigned long interval = 10000; // 10 detik

// Create an instance of the DHTesp library
DHTesp dhtSensor; 

// Create a WiFi client object
WiFiClient client; 

void setup() {
  // Initialize the serial communication at a baud rate of 115200
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22); // Initialize the DHT22 sensor
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);

  WiFi.begin(WIFI_NAME, WIFI_PASSWORD); // Connect to the WiFi network
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected"); // Print a message if WiFi is not connected
  }

  Serial.println("Wifi connected !"); // Print a message if WiFi is connected
  Serial.println("Local IP: " + String(WiFi.localIP())); // Print the local IP address
  
  WiFi.mode(WIFI_STA); // Set the WiFi mode to station mode
  ThingSpeak.begin(client); // Initialize the ThingSpeak library
}

void reconnect() { //buat fungsi untuk reconnect wifi secara otomatis
  unsigned long currentMillis = millis();
  
  // Jika tidak terkoneksi WiFi dan sudah lewat interval
  if ((WiFi.status() != WL_CONNECTED) && (currentMillis - previousMillis >= interval)) {
    Serial.print(millis());
    Serial.println(" Reconnecting to WiFi...");
    WiFi.disconnect();
    WiFi.reconnect();
    previousMillis = currentMillis;
  }
}

void loop() {
  // Read temperature and humidity from the DHT22 sensor
  TempAndHumidity data = dhtSensor.getTempAndHumidity();

  suhu = data.temperature;

  //print data ke serial monitor
  Serial.println("Temp: " + String(data.temperature, 2) + "°C"); // Print the temperature value with 2 decimal places
  Serial.println("Humidity: " + String(data.humidity, 1) + "%"); // Print the humidity value with 1 decimal place
  
  //print suhu ke LCD
  lcd.setCursor(0,0);   
  lcd.print("Temp :");
  lcd.setCursor(7,0);   
  lcd.print(suhu);
  lcd.setCursor(13,0);   
  lcd.print((char)223);
  lcd.setCursor(14,0);   
  lcd.print("C");
  
  //print kelembaban ke LCD
  lcd.setCursor(0,1);  
  lcd.print("Humi : ");
  lcd.setCursor(7,1);  
  lcd.print(data.humidity);
  lcd.setCursor(12,1);   
  lcd.print(" %");

  // Set the value of field 1 in the ThingSpeak channel to the temperature
  ThingSpeak.setField(1, suhu);
  // Set the value of field 2 in the ThingSpeak channel to the humidity 
  ThingSpeak.setField(2, data.humidity); 

  // Write the data to the ThingSpeak channel
  int status = ThingSpeak.writeFields(myChannelNumber,myApiKey); 
  
  if(status == 200){
    Serial.println("Data pushed successfully"); // Print a message if the data was successfully pushed to ThingSpeak
  }
  else{
    Serial.println("Push error" + String(status)); // Print an error message with the HTTP status code if there was an error pushing the data
  }
  Serial.println("---"); // Print a separator line

  delay(5000); // Delay for 5 seconds
}