#include <LiquidCrystal.h>

// LCD 16x2
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// Pins
int ledVert = 6;
int ledJaune = 7;
int ledRouge = 8;
int buzzer = 9;
int boutonReset = 10;

int tempPin = A0; // potentiomètre température
int vibPin = A1;  // potentiomètre vibration

// Variables
float temperature;
int vibration;
bool defaut = false;
bool machineON = true;

// Temps
unsigned long previousMillis = 0;
unsigned long previousLedMillis = 0;
unsigned long tempsON = 0;
unsigned long tempsAlerte = 0;
unsigned long debutDefaut = 0; // pour calculer 10s avant arrêt machine

// Durées
const unsigned long intervalleMesure = 1000; // 1s pour mesure
const unsigned long intervalleLED = 500;     // 500ms pour clignotement
const unsigned long dureeArretMachine = 10000; // 10s avant arrêt

void setup() {
  lcd.begin(16, 2);
  pinMode(ledVert, OUTPUT);
  pinMode(ledJaune, OUTPUT);
  pinMode(ledRouge, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(boutonReset, INPUT_PULLUP);

  lcd.print("Systeme Pret");
  delay(2000);
}

void loop() {
  unsigned long currentMillis = millis();

  // Lecture capteurs simulés
  temperature = analogRead(tempPin) * 5.0 / 1023.0 * 100;
  vibration = analogRead(vibPin);

  // 🔹 Reset défaut
  if (digitalRead(boutonReset) == LOW) {
    beep(2000, 200);
    defaut = false;
    machineON = true;
    tempsON = 0;
    tempsAlerte = 0;
    debutDefaut = 0;
  }

  // 🔹 Calcul temps chaque seconde (non-blocking)
  if (currentMillis - previousMillis >= intervalleMesure) {
    previousMillis = currentMillis;
    if (!defaut) {
      if (temperature < 40 && vibration < 500) tempsON++;
      else if (temperature >= 40 && temperature < 60) tempsAlerte++;
    }
  }

  // 🔹 Logique
  if (temperature < 40 && vibration < 500 && !defaut) {
    machineON = true;
    debutDefaut = 0;
    etatNormal();
  }
  else if ((temperature >= 40 && temperature < 60) && !defaut) {
    machineON = true;
    debutDefaut = 0;
    etatAlerte();
  }
  else {
    if (!defaut) debutDefaut = millis();
    defaut = true;

    // Arrêt machine après 10s
    if (millis() - debutDefaut >= dureeArretMachine) machineON = false;

    etatDefaut();
  }
}

// ===== Fonctions =====
void etatNormal() {
  digitalWrite(ledVert, HIGH);
  digitalWrite(ledJaune, LOW);
  digitalWrite(ledRouge, LOW);
  noTone(buzzer);

  lcd.setCursor(0,0);
  lcd.print("NORMAL ON:     "); // clear line
  lcd.print(tempsON);
  lcd.print("s");

  lcd.setCursor(0,1);
  lcd.print("Temp: ");
  lcd.print((int)temperature);
  lcd.print(" C   "); // espace pour effacer anciens chiffres
}

void etatAlerte() {
  digitalWrite(ledVert, LOW);
  digitalWrite(ledJaune, HIGH);
  digitalWrite(ledRouge, LOW);

  // Buzzer intermittent
  if ((millis() / 1000) % 2 == 0) tone(buzzer, 800);
  else noTone(buzzer);

  lcd.setCursor(0,0);
  lcd.print("ALERTE:       "); // clear line
  lcd.print(tempsAlerte);
  lcd.print("s");

  lcd.setCursor(0,1);
  lcd.print("Temp: ");
  lcd.print((int)temperature);
  lcd.print(" C   ");
}

void etatDefaut() {
  unsigned long currentMillis = millis();
  // Clignotement LED Rouge + buzzer continu
  if (currentMillis - previousLedMillis >= intervalleLED) {
    previousLedMillis = currentMillis;
    digitalWrite(ledRouge, !digitalRead(ledRouge)); 
    tone(buzzer, 1000);
  }

  digitalWrite(ledVert, LOW);
  digitalWrite(ledJaune, LOW);

  lcd.setCursor(0,0);
  if (!machineON) lcd.print("MACHINE STOP  ");
  else lcd.print("DEFAUT ACTIF  ");

  lcd.setCursor(0,1);
  if (debutDefaut > 0 && machineON) {
    int reste = (int)((dureeArretMachine - (millis() - debutDefaut)) / 1000);
    if (reste < 0) reste = 0;
    lcd.print("Stop in: ");
    lcd.print(reste);
    lcd.print(" s   ");
  } else {
    lcd.print("Temp: ");
    lcd.print((int)temperature);
    lcd.print(" C   ");
  }
}

// ===== Fonction beep courte =====
void beep(int freq, int duree) {
  tone(buzzer, freq);
  delay(duree);
  noTone(buzzer);
}