// ---------------------------------------------------------
// I2C - LCD Anzeige
// Pinning: ESP32 D22 <=> SCL I2C_LCD
//                D21 <=> SDA
//                3V3 <=> Vcc
//                GND <=> GND
// Befehle:
// oLCD.init ()
// oLCD.backlight ();
// oLCD.clear ();
// oLCD.setCursor (iSpalte,iZeile);
// oLCD.print ("Hallo");
#include <LiquidCrystal_I2C.h>
#include <string.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

#define Taster_up 13
#define Taster_right 12
#define Taster_down 11
#define Taster_left 10

int Aktuelle_Zeile = 5;
int AKtuelle_Spalte = 5;
int direction = 0;
int direction_Spalte = 0;
int direction_Zeile = 0;

char sText [20];

LiquidCrystal_I2C oLCD (I2C_ADDR, LCD_COLUMNS, LCD_LINES);
// ---------------------------------------------------------
void LCDPrintChar(int iSpalte, int iZeile, char cZeichen){
  char sStr[2]; 
  sStr[0] = cZeichen; 
  sStr[1] = '\0';
  oLCD.clear ();
  oLCD.setCursor(iSpalte, iZeile);
  oLCD.print(sStr);
}

void setup()
{
  Serial.begin(9600);
  oLCD.init();
  oLCD.backlight(); 
  pinMode(Taster_up, INPUT_PULLUP);
  pinMode(Taster_left, INPUT_PULLUP);
  pinMode(Taster_down, INPUT_PULLUP);
  pinMode(Taster_right, INPUT_PULLUP);
}

void move_Ball(){
  if Aktuelle_Spalte < 19 && Aktuelle_Spalte > 1 && Aktuelle_Zeile < 3 && Aktuelle > 0{
    Aktuelle_Spalte=Aktuelle_Spalte+direction_Spalte;
    Aktuelle_Zeile=Aktuelle_Zeile+direction_Zeile;
    LCDPrintChar(Aktuelle_Spalte,Aktuelle_Zeile,'x'); 
  }else{
    
    switch(direction){
          case 0: direction_Spalte = 0; direction_Zeile = 1; break;
          case 1: direction_Spalte = 1; direction_Zeile = 1; break;
          case 2: direction_Spalte = 1; direction_Zeile = 0; break;
          case 3: direction_Spalte = 1; direction_Zeile = -1; break;
          case 4: direction_Spalte = 0; direction_Zeile = -1; break;
          case 5: direction_Spalte = -1; direction_Zeile = -1; break;
          case 6: direction_Spalte = -1; direction_Zeile = 0; break;
          case 7: direction_Spalte = -1; direction_Zeile = 1; break;
    }
  }
  

}


void loop() {
  oLCD.clear ();
  LCDPrintChar(0,0,'x');
  int iSpalte = 0;
  int iZeile =0;
  char sign = 'x';
  for(;;delay(20)){
    
    if (digitalRead(Taster_up)  == 0&& iZeile > 0){
      iZeile-=1;
      LCDPrintChar(iSpalte, iZeile, sign);
      Serial.println("Up");
      Serial.println(iZeile);
      delay(150);
    }
    if (digitalRead(Taster_right)==0&& iSpalte <19){
      iSpalte+=1;
      LCDPrintChar(iSpalte, iZeile, sign);
      Serial.println("right");
      Serial.println(iSpalte);
      delay(150);
    }
    if (digitalRead(Taster_down)==0&& iZeile < 3){
      iZeile+=1;
      LCDPrintChar(iSpalte, iZeile, sign);
      Serial.println("down");
      Serial.println(iZeile);
      delay(150);
    }
    if (digitalRead(Taster_left)==0 && iSpalte > 0){
      iSpalte-=1;
      LCDPrintChar(iSpalte, iZeile, sign);
      Serial.println("left");
      Serial.println(iSpalte);
      delay(150);
    }
  }
  }