#include <RTClib.h>
#include <Servo.h>
#include "HX711.h"
#include <LiquidCrystal_I2C.h>

void printTime(DateTime time);
void calculateDistance();
void displayLCD(DateTime time);
void calculateWeight();

const int trigPin = 2;
const int echoPin = 3;
const int buzzer = 4;
const int servoFeedCtn = 5;
const int loadPinDT = A0;
const int loadPinSCK = A1;

// event from 13:50 to 14:10
uint8_t morningFeedStartH = 7; // event start time: hour
uint8_t morningFeedStartM = 0; // event start time: minute
uint8_t morningFeedEndH   = 24; // event end time: hour


RTC_DS1307 rtc;
HX711 scale;
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows
Servo myservo1, myservo2;

char daysOfTheWeek[7][12] = {
  "Sunday",
  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday"
};

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

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1);
  }

  // automatically sets the RTC to the date & time on PC this sketch was compiled
  rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));

  // manually sets the RTC with an explicit date & time, for example to set
  // January 21, 2021 at 3am you would call:
  // rtc.adjust(DateTime(2021, 1, 21, 3, 0, 0));

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzer, OUTPUT);

  myservo1.attach(servoFeedCtn);
  myservo2.attach(53);

  scale.begin(loadPinDT, loadPinSCK);
  scale.set_scale();
  scale.tare();

  lcd.init(); // initialize the lcd
  lcd.backlight();
}

void loop() {
  DateTime now = rtc.now();
  calculateWeight();

  if (now.hour()   >= morningFeedStartH &&
      now.minute() >= morningFeedStartM &&
      now.hour()   <  morningFeedEndH) {

    Serial.println("It is on scheduled time");
    calculateDistance();
  }
  else {
    Serial.println("It is NOT on scheduled time");
  }

  //printTime(now);
  displayLCD(now);
  delay(1000);
}

void printTime(DateTime time) {
  Serial.print("TIME: ");
  Serial.print(time.year(), DEC);
  Serial.print('/');
  Serial.print(time.month(), DEC);
  Serial.print('/');
  Serial.print(time.day(), DEC);
  Serial.print(" (");
  Serial.print(daysOfTheWeek[time.dayOfTheWeek()]);
  Serial.print(") ");
  Serial.print(time.hour(), DEC);
  Serial.print(':');
  Serial.print(time.minute(), DEC);
  Serial.print(':');
  Serial.println(time.second(), DEC);
}

void calculateDistance(){
  long duration, distanceCm, distanceInch;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distanceCm = (duration/2) / 29.1;     // Divide by 29.1 or multiply by 0.0343
  distanceInch = (duration/2) / 74;   // Divide by 74 or multiply by 0.0135
  //distanceCm = 0.017 * duration;

  if(distanceCm < 30){
    tone(buzzer, 500);
  }
  else{                             // If the feed container is not empty
    //displayLCD(now);
    noTone(buzzer);
    myservo1.write(0);
    myservo2.write(180);
  }
}

void displayLCD(DateTime time){
  lcd.clear();                 // clear display
  lcd.setCursor(0, 0);         // move cursor to   (0, 0)
  lcd.print("Date: ");
  lcd.print(time.month()); // print message at (0, 0)
  lcd.print("/");
  lcd.print(time.day());
  lcd.print("/");
  lcd.print(time.year());
  //lcd.print(" ");
  //lcd.print(daysOfTheWeek[time.dayOfTheWeek()]);

  lcd.setCursor(0, 1);
  lcd.print("TIME: ");         // move cursor to   (2, 1)
  lcd.print(time.hour()); // print message at (2, 1)
  lcd.print(":");
  lcd.print(time.minute());
  lcd.print(":");
  lcd.print(time.second());
  //delay(2000);                 // display the above for two seconds
}

void calculateWeight(){
  if (scale.is_ready()) {
    long reading = scale.get_units();    // Get the weight reading in kg

    Serial.print("Weight: ");
    Serial.print(reading, 2);    // Print weight with 2 decimal places
    Serial.println(" kg");
  }
}