#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int BtStartStop = 32;
int BtReset = 35;
bool EtatBtStartStop;
bool EtatBtReset;
int EtatBoutonAppuyer;
int EtatChronoOnOFF;
int TempsEcoule;
int Milliseconde;
int Seconde;
int Minute;
int Heure;
unsigned long currentTime = 0;
unsigned long previousTime = 0;


void setup() 
{
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  
  pinMode(BtStartStop, INPUT_PULLUP);
  pinMode(BtReset, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.begin(16, 2);
  lcd.print ("Chrono :");
}

void loop() 
{
  EtatBtStartStop = digitalRead(BtStartStop);
  EtatBtReset = digitalRead(BtReset);
  if (EtatBtStartStop == LOW && EtatBoutonAppuyer == 0) {
    EtatBoutonAppuyer = 1;
    EtatChronoOnOFF = !EtatChronoOnOFF;
  }
  if (EtatBtReset == LOW && EtatChronoOnOFF == 0 && EtatBoutonAppuyer == 0) {
    EtatBoutonAppuyer = 1;
    Milliseconde = 0;
    Seconde = 0;
    Minute = 0;
    Heure = 0;
  }
  if (EtatBtStartStop == HIGH && EtatBtReset == HIGH) {
    EtatBoutonAppuyer = 0;
  }
  currentTime = millis();
  TempsEcoule = currentTime - previousTime;
  previousTime = millis();

  if (EtatChronoOnOFF == 1) {
    Milliseconde = Milliseconde + TempsEcoule;
    if (Milliseconde > 999) {
      Milliseconde = Milliseconde - 1000;
      Seconde++;
    }
    if (Seconde > 59) {
      Seconde = 0;
      Minute++;
    }
    if (Minute > 59) {
      Minute = 0;
      Heure++;
    }
  }
  lcd.setCursor(9, 1);
  lcd.print(":");
  if (Milliseconde > 99) {
    lcd.setCursor(10, 1);
    lcd.print(Milliseconde);
  }
  else if (Milliseconde > 9 && Milliseconde < 100) {
    lcd.setCursor(10, 1);
    lcd.print("0");
    lcd.setCursor(11, 1);
    lcd.print(Milliseconde);
  }
  else if (Milliseconde > 0 && Milliseconde < 10) {
    lcd.setCursor(10, 1);
    lcd.print("00");
    lcd.setCursor(12, 1);
    lcd.print(Milliseconde);
  }
  else {
    lcd.setCursor(9, 1);
    lcd.print(":000");
  }

  lcd.setCursor(6, 1);
  lcd.print(":");
  if (Seconde < 10) {
    lcd.setCursor(7, 1);
    lcd.print("0");
    lcd.setCursor(8, 1);
    lcd.print(Seconde);
  }
  else {
    lcd.setCursor(7, 1);
    lcd.print(Seconde);
  }

  lcd.setCursor(3, 1);
  lcd.print(":");
  if (Minute < 10) {
    lcd.setCursor(4, 1);
    lcd.print("0");
    lcd.setCursor(5, 1);
    lcd.print(Minute);
  }
  else {
    lcd.setCursor(4, 1);
    lcd.print(Minute);
  }
  if (Heure < 10) {
    lcd.setCursor(1, 1);
    lcd.print("0");
    lcd.setCursor(2, 1);
    lcd.print(Heure);
  }
  else {
    lcd.setCursor(1, 1);
    lcd.print(Heure);
  }
}