#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // پین‌های متصل به نمایشگر

int startButtonPin = 6; // پین متصل به دکمه شروع
int stopButtonPin = 7; // پین متصل به دکمه توقف
int recordButtonPin = 8; // پین متصل به دکمه ثبت رکورد
int resetButtonPin = 9; // پین متصل به دکمه ریست

int startButtonState = 0;
int stopButtonState = 0;
int recordButtonState = 0;
int resetButtonState = 0;

bool running = false;
unsigned long startTime = 0;
unsigned long elapsedTime = 0;

unsigned long record = 0;
bool recordSaved = false;
bool showRecord = false;

void setup() {
  lcd.begin(16, 2);
  pinMode(startButtonPin, INPUT);
  pinMode(stopButtonPin, INPUT);
  pinMode(recordButtonPin, INPUT);
  pinMode(resetButtonPin, INPUT);
}

void loop() {
  startButtonState = digitalRead(startButtonPin);
  stopButtonState = digitalRead(stopButtonPin);
  recordButtonState = digitalRead(recordButtonPin);
  resetButtonState = digitalRead(resetButtonPin);

  if (resetButtonState == HIGH) {
    running = false;
    elapsedTime = 0;
    startTime = 0;
    showRecord = false;
    delay(200); // جلوگیری از چندین بار ریست با یک فشار دکمه
  }

  if (startButtonState == HIGH && !running) {
    running = true;
    startTime = millis();
    elapsedTime = 0;
    showRecord = false;
  }

  if (stopButtonState == HIGH && running) {
    running = false;
    elapsedTime = millis() - startTime;
  }

  if (recordButtonState == HIGH && !running && !recordSaved) {
    record = elapsedTime;
    recordSaved = true;
    showRecord = true;
    delay(200); // جلوگیری از چندین بار ثبت رکورد با یک فشار دکمه
  }

  if (running) {
    elapsedTime = millis() - startTime;
    displayTime(elapsedTime);
  } else if (showRecord) {
    displayRecord(record);
  } else {
    displayTime(elapsedTime);
  }
}

void displayTime(unsigned long time) {
  int minutes = time / 60000;
  int seconds = (time % 60000) / 1000;
  int milliseconds = (time % 1000) / 10;

  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(minutes);
  lcd.print(":");
  
  if (seconds < 10) {
    lcd.print("0");
  }
  
  lcd.print(seconds);
  lcd.print(".");
  
  if (milliseconds < 10) {
    lcd.print("0");
  }
  
  lcd.print(milliseconds);
}

void displayRecord(unsigned long time) {
  int minutes = time / 60000;
  int seconds = (time % 60000) / 1000;
  int milliseconds = (time % 1000) / 10;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Record:");
  lcd.setCursor(0, 1);
  lcd.print(minutes);
  lcd.print(":");
  
  if (seconds < 10) {
    lcd.print("0");
  }
  
  lcd.print(seconds);
  lcd.print(".");
  
  if (milliseconds < 10) {
    lcd.print("0");
  }
  
  lcd.print(milliseconds);
}