/*
  diagram.json is really buggy at the moment.
  Expect bugs as I can't operate it right now.
*/

#include <Wire.h>
#include <RTClib.h>

RTC_DS1307 rtc;

const int segmentPins[] = {8, 9, 10, 11, 12, 13, A0, A1};
const int digitPins[] = {2, 3, 4, 5};
const int colonPin = 6;
const int sqwPin = 7;

const byte digitPatterns[10] = {
  B11111100, // 0
  B01100000, // 1
  B11011010, // 2
  B11110010, // 3
  B01100110, // 4
  B10110110, // 5
  B10111110, // 6
  B11100000, // 7
  B11111110, // 8
  B11110110  // 9
};

void setup() {
  Wire.begin();
  rtc.begin();
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
    digitalWrite(segmentPins[i], LOW);
  }
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
    digitalWrite(digitPins[i], LOW);
  }
  pinMode(colonPin, OUTPUT);
  digitalWrite(colonPin, LOW);
  pinMode(sqwPin, INPUT); // Setting SQW pin as input
}

void loop() {
  DateTime now = rtc.now();
  int hours = now.hour();
  int minutes = now.minute();

  displayNumber(hours, minutes);
  delay(500);
  toggleColon();
  delay(500);

  int sqwState = digitalRead(sqwPin); // Read the state of the SQW pin
  Serial.print("SQW State: ");
  Serial.println(sqwState);
}

void displayNumber(int hours, int minutes) {
  int digits[4] = {
    hours / 10,
    hours % 10,
    minutes / 10,
    minutes % 10
  };
  for (int i = 0; i < 4; i++) {
    digitalWrite(digitPins[i], HIGH);
    displayDigit(digits[i]);
    delay(5);
    digitalWrite(digitPins[i], LOW);
  }
}

void displayDigit(int digit) {
  for (int i = 0; i < 8; i++) {
    digitalWrite(segmentPins[i], digitPatterns[digit] & (1 << (7 - i)));
  }
}

void toggleColon() {
  digitalWrite(colonPin, !digitalRead(colonPin));
}