#include <LiquidCrystal_I2C.h>
#include <OneButton.h>
#include <DHT.h>
#include <HCSR04.h>

#define LED_PIN 9
#define PHOTO_PIN A0
#define BTN_PIN 4
#define DHTPIN 7
#define DHTTYPE DHT11
#define TRIGGER_PIN 12
#define ECHO_PIN 11
#define LCD_ADDR 0x27

// Traduction
// State = État
// current = actuel
// rate = taux

enum AppState {DEMARRAGE, DHT_STATE, LUM_DIST, CALIBRATION};

AppState currentState = DEMARRAGE;

// Définir les variables globales
unsigned long currentTime;

LiquidCrystal_I2C lcd(LCD_ADDR,16,2);
OneButton button(BTN_PIN);
DHT dht(DHTPIN, DHTTYPE);
HCSR04 hc(TRIGGER_PIN, ECHO_PIN);

void setup() {
  Serial.begin(9600);

  initPins();
  lcdInit();
  buttonInit();
  dht.begin();
}

void initPins() {
  pinMode(LED_PIN, OUTPUT);
}

void lcdInit() {
  lcd.init(); // initialize the lcd              
  lcd.backlight();
}

void buttonInit() {
  // Faire le code pour l'initialisation du bouton
}

void loop() {
  currentTime = millis();

  switch(currentState) {
    case DEMARRAGE:
      bootState(currentTime);
      break;
    case DHT_STATE:
      dhtState(currentTime);
      break;
  }

  readSomeDataTask(currentTime);
  tacheAutre(currentTime);
}

// Représente une tâche quelconque qui doit être exéctué de façon continue
void readSomeDataTask(unsigned long ct){
  static unsigned long lastTime = 0;
  const int rate = 3000;

  if (ct - lastTime > rate) {
    lastTime = ct;

    // Exemple de tâche
    // Lire distance
  }
}

void tacheAutre(unsigned long ct){
  static unsigned long lastTime = 0;
  const int rate = 1000;

  if (ct - lastTime > rate) {
    lastTime = currectntTime;

    // Exemple de tâche
    // Lire distance
  }
}

void bootState(unsigned long ct) {
  static unsigned long lastTime = 0;
  const int exitTime = 3000;
  const int lcdRate = 250;
  
  if (ct - lastTime > lcdRate )
  {
    lastTime = currentTime;
    lcd.clear();
    lcd.setCursor(0,0);
    // Écrire numéro étudiant
    lcd.print("Etd 1: 1234567");
    lcd.setCursor(0,1);
    lcd.print("Etd 2: 7654321");
  }


  if (currentTime < exitTime) return;

  currentState = DHT_STATE;
}

void dhtState() {
  static unsigned long lastTime = 0;
  const int lcdRate = 250;

  if (currentTime - lastTime > lcdRate )
  {
    lastTime = currentTime;

    lcd.clear();
    lcd.setCursor(0,0);
    // Écrire numéro étudiant
    lcd.print("YOLO!!");
    lcd.setCursor(0,1);
    lcd.print(currentTime);
  }
}