#include <OneWire.h>

const int buttonPin = A1;

// Define the pins that are connected to the display.
const int segmentPins[] = {2, 3, 4, 5, 6, 7, 8};
const int digitSelectPins[] = {12, 11, 10, 9};

const byte digitPatterns[] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111, // 9
};

int tenSec = 3500;
int twentyfiveMin = 25 * 60;
bool timerStarted = false;
unsigned long startTime;

// void displayMessage(const char *message) {
//   Serial.println(message);
//   delay(1000);
// }

void setup() {
  Serial.begin(9600);
  pinMode(buttonPin, INPUT_PULLUP);
  // displayMessage("Press button to start timer");
  pins();
}

void pins(){
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  for (int i = 0; i < 4; i++) {
    pinMode(digitSelectPins[i], OUTPUT);
  }

  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], LOW);
  }

  for (int i = 0; i < 4; i++) {
    digitalWrite(digitSelectPins[i], HIGH);
  }
}

void displayNumber(int number) {
  int digits[4];

  for (int i = 0; i < 4; i++) {
    digits[i] = number % 10;
    number /= 10;
  }

  for (int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {
      digitalWrite(digitSelectPins[j], j == i ? LOW : HIGH);
    }
    delay(30);

    for (int j = 0; j < 7; j++) {
      digitalWrite(segmentPins[j], (digitPatterns[digits[i]] >> j) & 1);
    }
  }
  // delay(100);


}

void startTimer() {
  timerStarted = true;
  startTime = millis();
  // Serial.print("Timer started: ");
  // Serial.print(twentyfiveMin / 60);
  // Serial.println(":00");
}

void loop() {
  if (digitalRead(buttonPin) == HIGH && !timerStarted) {
    // delay(5);
    startTimer();
    
    delay(500);
  }

  if (timerStarted) {
    unsigned long elapsedTime = millis() - startTime;
    int remainingTime = tenSec - elapsedTime / 1000;
    remainingTime = max(0, remainingTime);

    int minutes = remainingTime / 60;
    int seconds = remainingTime % 60;
    // delay(50);
    displayNumber(minutes * 100 + seconds); // Display minutes and seconds together
    // delay(10);
    // if (remainingTime <= 0) {
    //   timerStarted = false;
    //   // displayMessage("Timer completed!");
    // }
  }
}