#include "HX711.h"
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <SPI.h>
#include <SD.h>
#include "uRTCLib.h" 
//#include <TinyGPS.h>

//Load Cell
#define DOUT  A0
#define CLK  A1
//HX711 scale(DOUT, CLK);
HX711 scale;
float calibration_factor = 420;   //420=X   43241=X  432.41=1 KG  864.8=V   2062.5 = 5 KG(timbangan)  3156.593 = 7.3 KG (TBS)
float GRAM;

//LCD
LiquidCrystal_I2C lcd(0x27,16,2);

//TOMBOL
#define cal_pin 2
#define up_pin 3
#define down_pin 4
#define save_pin 5
#define exit_pin 6
#define tare_pin 7

//Mode
int cal_mode, save_mode = 0;

//Micro SD
File myFile;
#define sd_pin 53

//RTC;
uRTCLib rtc(0x68);
char daysOfTheWeek[7][12] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};
String tanggal, bulan, tahun, jam, menit, detik;

//GPS
//float lat = 0;
//float lon = 0;
//TinyGPS gps;
//String latitude, longitude;

void setup() {
  Serial.begin(9600);

//Load Cell
  scale.begin(DOUT, CLK);  
  scale.set_scale();
  scale.tare();

//LCD
  lcd.init();  
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Angkong Digital");
  lcd.setCursor(0,1);
  lcd.print("INSTIPER");
  delay(3000);
  lcd.clear();

//TOMBOL
  pinMode(cal_pin, INPUT_PULLUP);
  pinMode(up_pin, INPUT_PULLUP);
  pinMode(down_pin, INPUT_PULLUP);
  pinMode(save_pin, INPUT_PULLUP);
  pinMode(exit_pin, INPUT_PULLUP);
  pinMode(tare_pin, INPUT_PULLUP);

//Micro SD
  Serial.print("Initializing SD card...");
  lcd.setCursor(0,0);
  lcd.print("Cek SD Card");  

  if (!SD.begin(sd_pin)) {
    Serial.println("initialization failed!");
    lcd.setCursor(0,1);
    lcd.print("SD card error");
    while (1);
  }
  Serial.println("initialization done.");
  lcd.setCursor(0,1);
  lcd.print("SD card OK ");
  delay(3000);
  lcd.clear(); 

//RTC
  URTCLIB_WIRE.begin();     

//GPS
//  Serial1.begin(9600);
}

void loop() {
  if(digitalRead(cal_pin) == LOW){
    cal_mode = 1;
  }

  if(digitalRead(tare_pin) == LOW){
    scale.set_scale();
    scale.tare();
    cal_mode = 0;
    lcd.clear(); 
  } 

  if(digitalRead(save_pin) == LOW){
    baca_load();
//    bacaGPS();
    String berat = String(GRAM);
    myFile = SD.open("save.txt", FILE_WRITE);
    if(myFile){
      Serial.println("Simpan data");

      myFile.print(tanggal);
      myFile.print("/");
      myFile.print(bulan);
      myFile.print("/");
      myFile.print(tahun);
      myFile.print(",");            
      myFile.print(jam);
      myFile.print(":");
      myFile.print(menit);
      myFile.print(":");
      myFile.print(detik);
      myFile.print(",");            
      myFile.print(berat);
      myFile.print(",");
//      myFile.print(latitude);
      myFile.print(",");
//      myFile.println(longitude);      

      myFile.close();
      Serial.println("Save Done");
      lcd.setCursor(0,0);
      lcd.print("Save done");
      delay(3000);
      lcd.clear();
      cal_mode = 0;
    }
    else{
      Serial.println("Gagal simpan");
      lcd.setCursor(0,0);
      lcd.print("Save error");
      delay(3000);
      lcd.clear(); 
      cal_mode = 0;     
    }
  }

  if(cal_mode == 1){
    cal_load();
  }
  else{
    baca_load();
  }
}

void cal_load(){
  lcd.clear();
  scale.set_scale(calibration_factor);
  GRAM = scale.get_units(), 4;
  lcd.print("Kalibrasi");
  Serial.print("Kalibrasi ");
  lcd.setCursor(0,1);
  lcd.print(GRAM);
  Serial.print(GRAM);
  lcd.setCursor(7,1);
  // lcd.print(calibration_factor);
  lcd.print(scale.get_value());   
  Serial.print(" ");
  Serial.println(calibration_factor);


  if(digitalRead(up_pin) == LOW){             //Jika tombol up ditekan maka akan naik 1 angka
    calibration_factor += 1;
    lcd.setCursor(0,1);
    lcd.print(GRAM);
    Serial.print(GRAM);
    lcd.setCursor(7,1);
    lcd.print(calibration_factor);   
    Serial.print(" ");
    Serial.println(calibration_factor);       
  }
  else if(digitalRead(down_pin) == LOW){      //Jika tombol down ditekan maka akan turun 1 angka
    calibration_factor -= 1;
    lcd.setCursor(0,1);
    lcd.print(GRAM);
    Serial.print(GRAM);
    lcd.setCursor(7,1);
    lcd.print(calibration_factor);   
    Serial.print(" ");
    Serial.println(calibration_factor);       
  }
  else if(digitalRead(save_pin) == LOW){      //Jika tombol save ditekan maka nilai akan di simpan
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Sukses");    
    cal_mode = 0;    
  }
  else if(digitalRead(exit_pin) == LOW){      //Jika tombol exit ditekan maka akan kembali ke halaman awal
    cal_mode = 0;
    lcd.clear();
  }
  else if(digitalRead(tare_pin) == LOW){      //Jika tombil tare ditekan maka akan mengkalibrasi posisi nol
    scale.set_scale();
    scale.tare();
    cal_mode = 0;
    lcd.clear();    
  }
  delay(500);

  if (Serial.available()) {
    char temp = Serial.read();
    if (temp == '+' || temp == 'a'){
      calibration_factor += 1;
      lcd.setCursor(0,1);
      lcd.print(GRAM);
      Serial.print(GRAM);
      lcd.setCursor(7,1);
      lcd.print(calibration_factor);   
      Serial.print(" ");
      Serial.println(calibration_factor);      
    }
    else if (temp == '-' || temp == 'z'){
      calibration_factor -= 1;
      lcd.setCursor(0,1);
      lcd.print(GRAM);
      Serial.print(GRAM);
      lcd.setCursor(7,1);
      lcd.print(calibration_factor);   
      Serial.print(" ");
      Serial.println(calibration_factor);      
    }
    else if (temp == 't'){
      scale.set_scale();
      scale.tare();
      cal_mode = 0;
      lcd.clear(); 
    }
  }  
}

void baca_load(){
  bacaWaktu();
  scale.set_scale(calibration_factor);
  GRAM = scale.get_units(), 4;

  lcd.setCursor(0,1);
  lcd.print("Berat ");
  lcd.setCursor(7,1);
  lcd.print(GRAM);

  Serial.print(" | ");
  Serial.print("Berat : ");
  Serial.println(GRAM);
  delay(1000);
  lcd.clear();
  delay(100);
}

void bacaWaktu(){
  rtc.refresh();

  tanggal = rtc.day();
  bulan = rtc.month();
  tahun = rtc.year();
  jam = rtc.hour();
  menit = rtc.minute();
  detik = rtc.second();

  lcd.setCursor(0,0);
  lcd.print(tanggal);
  lcd.print("/");
  lcd.print(bulan);
  lcd.print("/");
  lcd.print(tahun);
  lcd.print(" ");
  lcd.print(jam);
  lcd.print(":"); 
  lcd.print(menit);

  Serial.print("Current Date & Time: ");
  Serial.print(rtc.year());
  Serial.print('/');
  Serial.print(rtc.month());
  Serial.print('/');
  Serial.print(rtc.day());

  Serial.print(" (");
  Serial.print(daysOfTheWeek[rtc.dayOfWeek()-1]);
  Serial.print(") ");

  Serial.print(rtc.hour());
  Serial.print(':');
  Serial.print(rtc.minute());
  Serial.print(':');
  Serial.print(rtc.second());
  
  // delay(1000);  
}

//void bacaGPS(){
//  while(Serial1.available()){
//    if(gps.encode(Serial1.read())){ 
//    gps.f_get_position(&lat,&lon);

//    Serial.print("Position: ");
//    Serial.print("Latitude: ");
//    Serial.print(lat,6);
//    Serial.print(",");
//    Serial.print("Longitude: ");
//    Serial.println(lon,6); 

//    latitude = lat;
//    longitude = lon;
//   }
//  }  
//}