//include the library code
#include <LiquidCrystal.h>
#include <EEPROM.h>
#include <Hx711.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 1);
Hx711 scale(A2, A3);

const int button = 2; // This is the button for the Goal
const int button1 = 6; // This is the button for the Alarm
int Piezo = 8;
int volatile ButtonState = 0;
float Drink;
const float eps = 1e-6;
long changeTime, Alarm;
int n;
double a[100100];
float Goal = 3000;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);

  pinMode(button, INPUT);
  pinMode(button1, INPUT);
  pinMode(Piezo, OUTPUT);
  ButtonState = digitalRead(button);
  attachInterrupt(0,pin_ISR,RISING);

  lcd.print("Welcome to the");
  lcd.setCursor(0, 1);
  lcd.print("Reminder Bottle!");
}

void loop() {
  lcd.clear();
  scale.getGram();
  a[++n]=scale.getGram();
  for (int i=1; i<n; ++i)
  {Drink += a[i]>a[i+1]?a[i]-a[i+1]:0;}
  Serial.println(scale.getGram(), 1); // Check at the program
  lcd.print("level: ");
  lcd.print(scale.getGram(), 1); // Print the water left
  lcd.print(" ml");
  lcd.setCursor(0,1);
  lcd.print("Drink: ");
  lcd.print(Drink);// Print the water consumption
  lcd.print(" ml");
  delay(3000);
  if(Weight <= eps && (millis() - changeTime) > 5400000)
  {alarm();
  }
  if(button1 == HIGH && (millis() - Alarm) > 3600000)
  {hourlyAlarm();
  }
}

void pin_ISR()
{
  if (ButtonState == HIGH);
  {
  lcd.clear();
  if(Drink>Goal)
  {lcd.print("Success!");}
  else {lcd.print("Drink more!");}
  }
}

void alarm()
 {
   lcd.clear();
   lcd.print("Check your bottle");
   lcd.setCursor(0,1);
   lcd.print("or drink more");
   changeTime = millis();
 }
void hourlyAlarm()
 {
   lcd.clear();
   lcd.print("Drinking time!");
   tone(Piezo,700,500);
   delay(3000);
   digitalWrite(Piezo, LOW);
   Alarm = millis();
 }