#include <IRremote.h>
#include <LiquidCrystal_I2C.h>

#define PIN_RECEIVER 11

// I2C Display
#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

IRrecv receiver(PIN_RECEIVER);
decode_results irRecvResults; 

enum set_wecker_stellen { uebersicht, uebersicht_2 };
set_wecker_stellen state_wecker_stellen = set_wecker_stellen::uebersicht;

bool set_alarm_clock_entry = true;

bool weckerA = true;
bool weckerB = false;

unsigned long current_time = 0;
unsigned long acttime = 0;

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  receiver.enableIRIn(); // Aktiviere IR-Empfang
}

void loop() {
  acttime = millis();
  switch (state_wecker_stellen) {
    case (uebersicht):
      if (set_alarm_clock_entry) {
        current_time = acttime;
        lcd.setCursor(0, 0);
        lcd.print("Wecker A:");
        lcd.setCursor(0, 1);
        lcd.print("Wecker B:");
        set_alarm_clock_entry = false;
        if (weckerA) {
          lcd.setCursor(11, 0);
          lcd.print("HH:MM");
        }
        if (weckerB) {
          lcd.setCursor(11, 1);
          lcd.print("HH:MM");
        }
        if (!weckerA) {
          lcd.setCursor(11, 0);
          lcd.print("aus");
        }
        if (!weckerB) {
          lcd.setCursor(11, 1);
          lcd.print("aus");
        }
      }
      
      if (receiver.decode(&irRecvResults)) {
        unsigned int value = irRecvResults.value;
        
        if (value == 0xFF4AB5) { // Wert für die Taste "8" auf der Fernbedienung
          lcd.setCursor(0, 0);
          lcd.print("Taste 8 wurde gedrückt!");
          delay(2000);
          lcd.clear();
        }
      
        receiver.resume();
      }
      
      if (acttime - current_time > 2000) {
        lcd.clear();
        state_wecker_stellen = set_wecker_stellen::uebersicht_2;
        set_alarm_clock_entry = true;
      }
      break;
      
    case(uebersicht_2):
      if (set_alarm_clock_entry) {
        current_time = acttime;
        lcd.setCursor(0, 0);
        lcd.print("8 => Eingabe IRF");
        lcd.setCursor(0, 1);
        lcd.print("Button =>NodeRED");
        set_alarm_clock_entry = false;
      }
      
      if (acttime - current_time > 2000) {
        lcd.clear();
        state_wecker_stellen = set_wecker_stellen::uebersicht;
        set_alarm_clock_entry = true;
      }
      break;
  }
}