#include <DS3232RTC.h>
#include <LiquidCrystal.h>

// Defines pin numbers
const int ledPin  = 12;
const int trigPin = 5;
const int echoPin = 4;
const int button = 13;
const int rs = 2,
          en = 3,
          d4 = 6,
          d5 = 7,
          d6 = 8,
          d7 = 9;

// Defines variables
long duration;
int distance;
int safetyDistance;
int currentButtonState;
int lastButtonState;
int a,
    b,
    c,
    x,
    y,
    z;

// Sets up LCD
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

DS3232RTC RTC;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(button, INPUT);

  Serial.begin(115200);
  lcd.begin(16, 2);
  RTC.begin();
  setSyncProvider(RTC.get);

  // If the time is wrong then set time with https://www.youtube.com/watch?v=Z-66x-9-7T0

  // Initiate RTC
  if (timeStatus() != timeSet) {
    lcd.setCursor(0, 0);
    lcd.print("RTC sync failed");
    delay(2000);
    lcd.clear();
  }

  else {
    lcd.setCursor(0, 0);
    lcd.print("RTC synced");
    delay(2000);
    lcd.clear();
  }
}

void loop() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculating the distance
  distance = duration * 0.034 / 2;
  safetyDistance = distance;

  // If the mower docks
  if (safetyDistance <= 10) {
    // Timestamp for mower entering dock
    lcd.setCursor(0, 0);
    lcd.print("Mower docked:");
    lcd.setCursor(0, 1);
    digitalClockDisplay();
    digitalTimeStampSet();
    delay(5000);
    lcd.clear();

    // Wait until the mower undocks
    while (safetyDistance <= 10) {
      lastButtonState = currentButtonState;
      currentButtonState = digitalRead(button);

      // Clears the trigPin
      digitalWrite(trigPin, LOW);
      delayMicroseconds(2);

      // Sets the trigPin on HIGH state for 10 micro seconds
      digitalWrite(trigPin, HIGH);
      delayMicroseconds(10);
      digitalWrite(trigPin, LOW);

      // Reads the echoPin, returns the sound wave travel time in microseconds
      duration = pulseIn(echoPin, HIGH);

      // Calculating the distance
      distance = duration * 0.034 / 2;
      safetyDistance = distance;

      if (lastButtonState == LOW && currentButtonState == HIGH) {
        digitalWrite(ledPin, HIGH);
        lcd.setCursor(0, 0);
        lcd.print("Mower docked:");
        lcd.setCursor(0, 1);
        digitalTimeStamp();
        delay(5000);
        digitalWrite(ledPin, LOW);
        lcd.clear();
      }

      delay(100);
    }

    // Timestamp for mower leaving dock
    digitalWrite(ledPin, LOW);
    lcd.setCursor(0, 0);
    lcd.print("Mower undocked:");
    lcd.setCursor(0, 1);
    digitalClockDisplay();
    digitalTimeStampSet();
    delay(5000);
    lcd.clear();
  }

  // When the mower is out in the garden
  else if (safetyDistance > 10) {
    lastButtonState = currentButtonState;
    currentButtonState = digitalRead(button);

    digitalWrite(ledPin, LOW);

    if (lastButtonState == LOW && currentButtonState == HIGH) {
      digitalWrite(ledPin, HIGH);
      lcd.setCursor(0, 0);
      lcd.print("Mower undocked:");
      lcd.setCursor(0, 1);
      digitalTimeStamp();
      delay(5000);
      digitalWrite(ledPin, LOW);
      lcd.clear();
    }
  }
}

void digitalTimeStampSet() {
  a = hour();
  b = minute();
  c = second();
  x = day();
  y = month();
  z = year();
}

void digitalTimeStamp() {
  lcd.print(a);
  printDigits(b);
  printDigits(c);
  lcd.print(' ');
  lcd.print(x);
  lcd.print('/');
  lcd.print(y);
  lcd.print('/');
  lcd.print(z);
  lcd.println();
}

void digitalClockDisplay() {
  lcd.print(hour());
  printDigits(minute());
  printDigits(second());
  lcd.print(' ');
  lcd.print(day());
  lcd.print('/');
  lcd.print(month());
  lcd.print('/');
  lcd.print(year());
  lcd.println();
}

void printDigits(int digits) {
  lcd.print(':');
  if (digits < 10) {
    lcd.print('0');
  }
  lcd.print(digits);
}