/*
  https://forum.arduino.cc/t/led-counter-in-alarmanlage-funktioniert-nicht/1190968
  2023-11-19 by noiasca
  sketch might get copied to thread when TO reacts...
*/

#include <LiquidCrystal.h>
const uint8_t Eingang = 8;
const uint8_t buzzerPin = 10;
const uint8_t Licht = A6;
const uint8_t L1 = A3;               // pins for the LEDs
const uint8_t L2 = A2;
const uint8_t L3 = A1;
const uint8_t L4 = A0;

const uint8_t rs = 11, en = 12, d4 = 3, d5 = 4, d6 = 5, d7 = 6;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

int A;
int VWert = HIGH;
int VSchranke = 0;
int (Speicher) = 0;

uint8_t status = 0;                     // store the global state we are in

// I assume you want more LEDs blink, hence let's prepare a reusable class
class Led {
  protected:
    const uint8_t pin;                  // the pin for the the LED
    uint32_t previousMillis = 0;        // time management
    uint8_t state = 0;                  // 0 off, 1 allways on, 2 blink
  public:
    Led(uint8_t pin) : pin(pin) {}
    // to be called in setup
    void begin() {
      pinMode(pin, OUTPUT);
    }

    // start blinking
    void blink() {
      state = 2;
    }

    // switch off LED
    void on() {
      state = 1;
      digitalWrite(pin, HIGH);
    }

    // switch off LED
    void off() {
      state = 0;
      digitalWrite(pin, LOW);
    }

    // call in loop
    void update(uint32_t currentMillis = millis()) {
      if (state == 2 && currentMillis - previousMillis > 1000) {
        previousMillis = currentMillis;
        if (digitalRead(pin) == LOW)
          digitalWrite(pin, HIGH);
        else
          digitalWrite(pin, LOW);
      }
    }
};
Led led1(L1); // create a LED object

void setup() {
  pinMode(Eingang, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(Licht, INPUT);
  pinMode(L2, OUTPUT);
  pinMode(L3, OUTPUT);
  pinMode(L4, OUTPUT);
  digitalWrite(L2, LOW);
  digitalWrite(L3, LOW);
  digitalWrite(L4, LOW);
  led1.begin(); // start the LED object
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Booting up...");
  lcd.blink();
  delay(2000);
  lcd.noBlink();
  lcd.clear();
  lcd.setCursor(0, 1);
  lcd.print("*System bereit*");
  tone(buzzerPin, 700, 100);
  delay(1500);
  lcd.clear();
  Serial.println(F("start"));
  changeLed();
}

void changeLed() {
  switch (status) {
    case 0:
      led1.blink();
      digitalWrite(L2, LOW);
      digitalWrite(L3, LOW);
      digitalWrite(L4, LOW);
      break;
    case 1:
      led1.off();
      digitalWrite(L2, HIGH);
      break;
    case 2:
      digitalWrite(L3, HIGH);
      break;
    case 3:
      digitalWrite(L4, HIGH);
      break;
  }
}

void loop() {
  static uint8_t lastButtonState = HIGH;        // must survive loop, hence static
  uint8_t buttonState = digitalRead(Eingang);
  if (buttonState != lastButtonState) {
    if (buttonState == LOW) {
      if (status < 3) status++;
      changeLed();
      Serial.print(F("status=")); Serial.println(status);
    }
    delay(50); // debounce
  }
  lastButtonState = buttonState;
  led1.update();  // trigger LED object in loop
}

/*
  void loopAlt() {
  int Wert = digitalRead(Eingang);
  int Schranke = analogRead(Licht);
  Serial.println(Schranke);
  if (Wert == LOW && VWert != LOW) {
    // Alarm ausgelöst
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("!!!ALARM!!!");
    lcd.setCursor(0, 1);
    lcd.print("Bedrohungslage");
    siren();
    Speicher = Speicher + 1;

  } else if (Wert == HIGH && VWert != HIGH) {
    // Alarm deaktiviert
    lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print("Bereich sicher");
    noTone(buzzerPin);
  }

  if (Schranke < 1 && VSchranke >= 1) {
    // Alarm ausgelöst
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("!!!ALARM!!!");
    lcd.setCursor(0, 1);
    lcd.print("Bedrohungslage");
    siren();
    Speicher = Speicher + 1;

  } else if (Schranke >= 1 && VSchranke < 1) {
    // Alarm deaktiviert
    lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print("Bereich sicher");
    noTone(buzzerPin);
  }

  VWert = Wert;
  VSchranke = Schranke;

  if (Speicher == 0)
    blink();


  if (Speicher == 1)
    digitalWrite(L2, HIGH);

  if (Speicher == 2)
    digitalWrite(L2, HIGH);
  digitalWrite(L3, HIGH);

  if (Speicher == 3)
    digitalWrite(L2, HIGH);
  digitalWrite(L3, HIGH);
  digitalWrite(L4, HIGH);

  if (Speicher >= 4)
    digitalWrite(L1, HIGH);
  digitalWrite(L2, HIGH);
  digitalWrite(L3, HIGH);
  digitalWrite(L4, HIGH);

  }

  void blink() {
  if (Speicher = 0)
    digitalWrite(L1, HIGH);
  delay(1000);
  digitalWrite(L1, LOW);
  delay(1000);
  }

  void siren() {
  for (int i = 10; i < 800; i += 90) {
    tone(buzzerPin, i);
    delay(130);
  }
  }
*/