#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);
#include <RTClib.h>
RTC_DS1307 rtc;
DateTime waktu;
int jam,menit,detik,tahun,bulan,hari;
char temp[20],temp2[8];
const float GAMMA = 0.7;
const float RL10 = 50;
#include "FS.h";
#include "SD.h";
#include "SPI.h";
String NamaFile = "\dataku.txt";
const float BETA = 3950; 

void setup() {
  lcd.init();
  Serial.begin(115200);
  rtc.begin();
  if(!SD.begin(5))
  {
    lcd.home();
    lcd.print("cek SD Card");
    return;
  }
  waktu = rtc.now();
  jam = waktu.hour();
  menit = waktu.minute();
  detik = waktu.second();
  sprintf(temp,"%2d:%2d:%2d:%2d", jam, menit, detik);

  buatFile(SD, NamaFile, temp, "waktu,lux");
  bacaFile(SD, NamaFile);
  lcd.home();
  lcd.print("     HELLO WORLD");
  delay(100);
  // put your setup code here, to run once:
  //Serial.begin(115200);

  
}

void loop() {
  
  lcd.setCursor(0,1);
  lcd.print(temp);
  Serial.print();
  tahun = waktu.year();
  bulan = waktu.month();
  hari = waktu.day();
  sprintf(temp,"%2d/%2d/%2", tahun, bulan, hari);
  lcd.setCursor(0,2);
  lcd.print(temp);


int analogValue = analogRead(36);
float voltage = analogValue / 4095. * 5;
float resistance = 2000 * voltage / (1 - voltage / 5);
float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
dtostrf(lux,6,2,temp2);
//sprintf(temp,"Cahaya : %s",temp2);
lcd.setCursor(0,3);
lcd.print(temp);
  delay(10); // this speeds up the simulation
}

void cekIsi(fs::FS &fs, const char * dirname, uint8_t levels){
  Serial.printf("Listing directory: %s\n", dirname);

  File root = fs.open(dirname);
  if(!root){
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Gagal buka folder");
    return;
  }
  if(!root.isDirectory()){
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Bukan folder");
   
    return;
  }

  File file = root.openNextFile();
  lcd.clear();
  int j=0;
  while(file){
    if(file.isDirectory()){
      Serial.print("  DIR : ");
      Serial.println(file.name());
      if(levels){
        cekIsi(fs, file.name(), levels -1);
      }
    } else {
  
    lcd.setCursor(0,j);
    lcd.print(file.name());
    j++;
    }
    file = root.openNextFile();
  }
}

void bacaFile(fs::FS &fs, String path){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Baca file : ");
    lcd.setCursor(0,1);
    lcd.print(path);
 
  File file = fs.open(path);
  if(!file){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Gagal membaca");
    return;
  }

  Serial.print("Read from file: ");
  while(file.available()){
    Serial.write(file.read());
  }
  file.close();
}
void buatFile(fs::FS &fs, String path, String  waktu ,String  message){
  lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Buat file : ");
    lcd.setCursor(0,3);
    lcd.print(path);
    
  File file = fs.open(path, FILE_WRITE);
  if(!file){
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Gagal menulis");
    delay(2000);
    return;
  }
    
  if(file){
   // Serial.printf("Appending to file: %s\n", path);
    file.print("ini adalah isi ");
    file.println(path);
    file.print("Mulai direkam pada ");
    file.println(waktu);
    file.println(message);

    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Berhasil menulis");
    delay(2000);
    
  } else {
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Gagal menulis");
  }
  file.close();
}

void isiFile(fs::FS &fs, String path, String message){
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Mengisi file : ");
    lcd.setCursor(0,1);
    lcd.print(path);
    
  File file = fs.open(path, FILE_APPEND);
  if(!file){
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Gagal mengisi");
    return;
  }
  if(file.println(message)){
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Isi tertambah");
      } else {
    lcd.clear();
    lcd.setCursor(0,3);
    lcd.print("Gagal mengisi");
    
  }
  file.close();
}
String ambil_waktu(DateTime waktu)
{
  sprintf(temp,"%2d/%2d/%2d %2d:%2d:%2d",waktu.day(),waktu.month(),waktu.year(),waktu.hour(),waktu.minute(),waktu.second());
  return temp;
}
float ambil_suhu(int analogValue)
{
  float celsius = 1 / (log(1 / (4095. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  return celsius;
}