#include <Ds1302.h>
#include <LiquidCrystal.h>

#define DS1302_RAMSIZE 31

Ds1302 rtc(3, 4, 5);
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

byte segment[8][8] =
{
  { B01111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111 },
  { B11111,  B11111,  B11111,  B00000,  B00000,  B00000,  B00000,  B00000 },
  { B11110,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111 },
  { B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B01111 },
  { B00000,  B00000,  B00000,  B00000,  B00000,  B11111,  B11111,  B11111 },
  { B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11111,  B11110 },
  { B11111,  B11111,  B11111,  B00000,  B00000,  B00000,  B11111,  B11111 },
  { B11111,  B00000,  B00000,  B00000,  B00000,  B11111,  B11111,  B11111 }
};

byte zero = 0x00;

int col = 0;

int number, lastMin1, lastMin2, lastHour1, lastHour2;

void setup()
{
  rtc.init();

  Ds1302::DateTime dt = {
      .year = 23,
      .month = Ds1302::MONTH_JAN,
      .day = 18,
      .hour = 22,
      .minute = 13,
      .second = 30,
      .dow = Ds1302::DOW_WED
  };

  rtc.setDateTime(&dt);

  lcd.begin(20, 2);

  for (byte i = 0; i < 8; i++)
  {
    lcd.createChar(i, segment[i]);
  }

}

void loop()
{
  // Extracts the time from the DS1307 and shows it on the LCD
  showClock();
  delay(1000);
}

byte convertToBCD(byte val) { // Converts the decimal number to BCD
  return ( (val / 10 * 16) + (val % 10) );
}

byte convertToDecimal(byte val) { // Converts from BCD to decimal
  return ( (val / 16 * 10) + (val % 16) );
}

void digit0() // Set the segments to the number 0
{
  lcd.setCursor(col, 0); // Select the top line
  lcd.write((byte)0);  // Segment 0 selected
  lcd.write(1);  // Segment 1 selected
  lcd.write(2);
  lcd.setCursor(col, 1); // Select the bottom line
  lcd.write(3);
  lcd.write(4);
  lcd.write(5);
}

void digit1() // Set the segments to the number 1
{
  lcd.setCursor(col, 0);
  lcd.write(1);
  lcd.write(2);
  lcd.setCursor(col + 1, 1);
  lcd.write(5);
}

void digit2() // Set the segments to the number 2
{
  lcd.setCursor(col, 0);
  lcd.write(6);
  lcd.write(6);
  lcd.write(2);
  lcd.setCursor(col, 1);
  lcd.write(3);
  lcd.write(7);
  lcd.write(7);
}

void digit3()  // Set the segments to the number 3
{
  lcd.setCursor(col, 0);
  lcd.write(6);
  lcd.write(6);
  lcd.write(2);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(7);
  lcd.write(5);
}

void digit4()  // Set the segments to the number 4
{
  lcd.setCursor(col, 0);
  lcd.write(3);
  lcd.write(4);
  lcd.write(2);
  lcd.setCursor(col + 2, 1);
  lcd.write(5);
}

void digit5()  // Set the segments to the number 5
{
  lcd.setCursor(col, 0);
  lcd.write((byte)0);
  lcd.write(6);
  lcd.write(6);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(7);
  lcd.write(5);
}

void digit6()  // Set the segments to the number 6
{
  lcd.setCursor(col, 0);
  lcd.write((byte)0);
  lcd.write(6);
  lcd.write(6);
  lcd.setCursor(col, 1);
  lcd.write(3);
  lcd.write(7);
  lcd.write(5);
}

void digit7() // Set the segments to the number 7
{
  lcd.setCursor(col, 0);
  lcd.write(1);
  lcd.write(1);
  lcd.write(2);
  lcd.setCursor(col + 1, 1);
  lcd.write((byte)0);
}

void digit8()  // Set the segments to the number 8
{
  lcd.setCursor(col, 0);
  lcd.write((byte)0);
  lcd.write((byte)6);
  lcd.write(2);
  lcd.setCursor(col, 1);
  lcd.write(3);
  lcd.write(7);
  lcd.write(5);
}

void digit9() // Set the segments to the number 9
{
  lcd.setCursor(col, 0);
  lcd.write((byte)0);
  lcd.write((byte)6);
  lcd.write((byte)2);
  lcd.setCursor(col + 2, 1);
  lcd.write((byte)5);
}

void showDigit() // Shows the number in the position defined by "X"
{
  switch (number) {
    case 0: digit0();
      break;
    case 1: digit1();
      break;
    case 2: digit2();
      break;
    case 3: digit3();
      break;
    case 4: digit4();
      break;
    case 5: digit5();
      break;
    case 6: digit6();
      break;
    case 7: digit7();
      break;
    case 8: digit8();
      break;
    case 9: digit9();
      break;
  }
}

void showClock()
{
  Ds1302::DateTime now;
  rtc.getDateTime(&now);
  now.hour = now.hour - 12;

  if (now.second & 1) {
    lcd.setCursor(8, 0);
    lcd.print(".");
    lcd.setCursor(8, 1);
    lcd.print(".");
  } else {
    lcd.setCursor(8, 0);
    lcd.print(" ");
    lcd.setCursor(8, 1);
    lcd.print(" ");
  }

  col = 0;
  number = now.hour / 10;

  // Conditional to avoid overlapping characters
  if (lastHour1 != now.minute % 10) {
    lcd.setCursor(0, 0);
    lcd.print("   ");
    lcd.setCursor(0, 1);
    lcd.print("   ");
    lastHour1 = now.minute % 10;
  }

  showDigit(); // Show the customized number on the display

  col = 4;
  number = now.hour % 10;

  if (lastHour2 != now.minute % 10) {
    lcd.setCursor(4, 0);
    lcd.print("   ");
    lcd.setCursor(4, 1);
    lcd.print("   ");
    lastHour2 = now.minute % 10;
  }

  showDigit();

  col = 9;
  number = now.minute / 10;

  if (lastMin1 != now.minute % 10) {
    lcd.setCursor(9, 0);
    lcd.print("   ");
    lcd.setCursor(9, 1);
    lcd.print("   ");
    lastMin1 = now.minute % 10;
  }

  showDigit();

  col = 13;
  number = now.minute % 10;

  if (lastMin2 != now.minute % 10) {
    lcd.setCursor(13, 0);
    lcd.print("   ");
    lcd.setCursor(13, 1);
    lcd.print("   ");
    lastMin2 = now.minute % 10;
  }

  showDigit();
}