/*
  Arduino | coding-help
  Making a simple 4 digit seven Segment display
  without using any sevSeg and Clock library

  Moong OP — 08/28/2024 3:51 AM
  Hello, I am currently trying to make a simple clock without using any
  of the given libraries. I am still not really well versed in coding so
  i tried to make the code with some of the assistance from ai but i
  cant really seem to create any specific output and i have no clue how
  to create a proper clock output

  NOTE:
  In a real circuit use a resistor per segment
  and a transistor driver for each digit.
*/

int A = 2;
int B = 3;
int C = 4;
int D = 5;
int E = 6;
int F = 7;
int G = 8;

int D1 = 9;
int D2 = 10;
int D3 = 11;
int D4 = 12;

int DP = 13;

int min_add = A0;
int min_minus = A1;

int MIN_ADD = 0;
int MIN_MINUS = 0;

unsigned long previousMillis = 0;
const long interval = 60000; // 1 minute interval

int hr = 1;
int min = 0;

void setup() {
  // 7 SEGMENT LED
  pinMode(A, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(C, OUTPUT);
  pinMode(D, OUTPUT);
  pinMode(E, OUTPUT);
  pinMode(F, OUTPUT);
  pinMode(G, OUTPUT);

  // Decimal point
  pinMode(DP, OUTPUT);

  // Clock digits
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
  pinMode(D3, OUTPUT);
  pinMode(D4, OUTPUT);

  pinMode(min_add, INPUT);
  pinMode(min_minus, INPUT);
}

void closed() {
  digitalWrite(D1, HIGH);
  digitalWrite(D2, HIGH);
  digitalWrite(D3, HIGH);
  digitalWrite(D4, HIGH);

  digitalWrite(A, HIGH);
  digitalWrite(B, HIGH);
  digitalWrite(C, HIGH);
  digitalWrite(D, HIGH);
  digitalWrite(E, HIGH);
  digitalWrite(F, HIGH);
  digitalWrite(G, LOW);
}

void pick_num(int digit) {
  switch (digit) {
    case 1: digitalWrite(D1, LOW); break;
    case 2: digitalWrite(D2, LOW); break;
    case 3: digitalWrite(D3, LOW); break;
    case 4: digitalWrite(D4, LOW); break;
  }
}

void exit_num(int digit) {
  switch (digit) {
    case 1: digitalWrite(D1, HIGH); break;
    case 2: digitalWrite(D2, HIGH); break;
    case 3: digitalWrite(D3, HIGH); break;
    case 4: digitalWrite(D4, HIGH); break;
  }
}

void display_num(int number) {
  switch (number) {
    case 0: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
      break;
    case 1: digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    case 2: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
      break;
    case 3: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
      break;
    case 4: digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    case 5: digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    case 6: digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    case 7: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
      break;
    case 8: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
    case 9: digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
      break;
  }
}

void all_low() {
  digitalWrite(A, LOW);
  digitalWrite(B, LOW);
  digitalWrite(C, LOW);
  digitalWrite(D, LOW);
  digitalWrite(E, LOW);
  digitalWrite(F, LOW);
  digitalWrite(G, LOW);

  digitalWrite(D1, LOW);
  digitalWrite(D2, LOW);
  digitalWrite(D3, LOW);
  digitalWrite(D4, LOW);
}

void display_min(int number) {
  closed();
  int num1 = number % 10;
  int num2 = number / 10;

  pick_num(1);
  display_num(num1);
  delay(5);
  exit_num(1);

  pick_num(2);
  display_num(num2);
  delay(5);
  exit_num(2);
}

void display_hr(int number) {
  closed();
  int num1 = number % 10;
  int num2 = number / 10;

  pick_num(3);
  display_num(num1);
  delay(5);
  exit_num(3);

  pick_num(4);
  display_num(num2);
  delay(5);
  exit_num(4);
}

void adjust_time(int &hr, int &min) {
  unsigned long currentMillis = millis();

  // Automatic time increment every 1 minute
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    if (min < 59) {
      min++;
    } else {
      min = 0;
      if (hr < 12) {
        hr++;
      } else {
        hr = 1;
      }
    }
  }

  // Manual time adjustment
  MIN_ADD = digitalRead(min_add);
  MIN_MINUS = digitalRead(min_minus);

  if (MIN_ADD == HIGH) {
    delay(50);  // Debounce delay
    if (digitalRead(min_add) == HIGH) {
      if (min < 59) {
        min++;
      } else {
        min = 0;
        if (hr < 12) {
          hr++;
        } else {
          hr = 1;
        }
      }
      delay(250);  // Prevent multiple increments on a single press
    }
  }

  if (MIN_MINUS == HIGH) {
    delay(50);  // Debounce delay
    if (digitalRead(min_minus) == HIGH) {
      if (min > 0) {
        min--;
      } else {
        min = 59;
        if (hr > 1) {
          hr--;
        } else {
          hr = 12;
        }
      }
      delay(250);  // Prevent multiple decrements on a single press
    }
  }
}

void display_time() {
  adjust_time(hr, min);
  for (int j = 0; j < 5; j++) {
    display_min(min);
    display_hr(hr);
  }
}

void loop() {
  display_time();
}