//Tutorial from
//https://arduino8.webnode.cz/news/lekce-17-arduino-a-eeprom/
//256 32768Byte = -1 for num, /8 = 4095 code
//128 32768Byte = -1 for num, /8 = 4095 code
//32  = -1 for num, /8 = 511 code


#include <EEPROM.h>
 
void setup() {
  Serial.begin(9600);

  //budeme zapisovat do pameti kody
  
  //zapiseme pocet cipu  
  EEPROM.write(1, 8);

  int adr=10; //start Adr
  //naplnime data
    //TextToEEPROM(adr,8, "F8A21000");
    //adr+=8; 
  TextToEEPROM(adr,8,"D2C3AB85");
  TextToEEPROM(adr+=8,8,"A258DB40");
  TextToEEPROM(adr+=8,8,"D20AC850");
  TextToEEPROM(adr+=8,8,"C2C3AB85");
  TextToEEPROM(adr+=8,8,"D258DB40");
  TextToEEPROM(adr+=8,8,"E20AC850");
  TextToEEPROM(adr+=8,8,"AF58DB20");
  TextToEEPROM(adr+=8,8,"FF58DB20");
 

  //for (int i=10; i< 42; i+=8){
  //  Serial.println(TextFromEEPROM(i,8));
  //}
  
 
  //hledame cip
  Serial.println("SEARCH");
  if (Compare("E20AC850")){
    Serial.println("FOUND end srch");
  }else{
    Serial.println("NOT FOUND");
  }



}


void loop() {}


//najdeme v pameti 
bool Compare(String srchCode){
  
  //read num of code
  int codeCount = EEPROM.read(1);
  Serial.println(codeCount);     
  
  int adr = 10; //prvni adresa pro kody
  String value;
  //maximalni pocet cipu 255 tj po 4 cipe 63 bytu store in 1B
  // 2Byte  510 tj po 4 cipech  127 bytu
  //nacteme adresy 
  //cisla cipu budou od 10 po 8byte
  //nacitame dokud nenarazime na prazdnou hodnotu
  for (int i=1; i<=codeCount; i++){
      value = TextFromEEPROM(adr,8);
      //Serial.print(srchCode);     
      //Serial.print(" ");     
      Serial.println(value);     
      //cteme kody od prvni pozice do posledni
      adr += 8;
      if (value == srchCode)
        return true;

  }
  return false;  
}

 
void TextToEEPROM(int adresa, int maxVelikost, String text){
  for (int i = 0;i < text.length();i++){
    EEPROM.write(adresa + i, (byte)text[i]);
  }
  for (int i = text.length();i < maxVelikost;i++){
    EEPROM.write(adresa + i, ' ');
  }  
}
 
String TextFromEEPROM(int adresa, int maxVelikost){
  String TextFromEEPROM = "";
  for (int i = 0;i < maxVelikost;i++){
    char znak = (char)EEPROM.read(adresa + i);
    TextFromEEPROM = TextFromEEPROM + znak;  
  }
  while (TextFromEEPROM[TextFromEEPROM.length() - 1] == ' '){  
      TextFromEEPROM = TextFromEEPROM.substring(0,TextFromEEPROM.length() - 1);
  }
  return  TextFromEEPROM;
}