#include <LCDI2C_Multilingual.h>
LCDI2C_Katakana_Vietnamese lcd(0x27, 20, 4);

char LineText[] = "kachnicka a slepicka9899987";
char CurTime[] = "26-01-05,21:12:35";
uint32_t timestamp;

typedef const __FlashStringHelper *	FStringPtr;
// FStringPtr txtP;

class Disp {
  public:
    void LcdLine2(uint8_t line, FStringPtr txt) {
      char Tline[21] = {};
      lcd.setCursor(0, line);
      lcd.print(F("                    "));
      strncpy_PF(Tline, txt, 20);
      Serial.println("Fstring overload used");
      lcd.setCursor(0, line);
      lcd.print(Tline);
    }

    void LcdLine2(uint8_t line, char *txt) {
      char Tline[21] = {};
      lcd.setCursor(0, line);
      lcd.print(F("                    "));
      strncpy(Tline, txt, 20);
      Serial.println("pointer overload used");
      lcd.setCursor(0, line);
      lcd.print(Tline);
    }
};

Disp DisplayP;

void setup() {
  // typedef const __FlashStringHelper *	FStringPtr;
  // void LcdLineP(uint8_t line, const __FlashStringHelper *  txt);

  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  lcd.println("____________________");
  lcd.println("____________________");
  lcd.println("____________________");
  lcd.println("____________________");
  timestamp = micros();
  LcdLine(0, "kachnicka a s");
  timestamp =  micros() - timestamp;
  Serial.print("Function new time: ");
  Serial.println(timestamp);
  timestamp = micros();
  LcdLine3(1, LineText);
  timestamp =  micros() - timestamp;
  Serial.print("Function old time: ");
  Serial.println(timestamp);
  // Serial.print("Printing affected array: ");
  // Serial.println(LineText);
  lcd.print("X");
  // LcdLine(1, "Slepicka");
  timestamp = micros();
  // LcdLineP(2, PSTR("kokrhacek a kdakalka kokodak"));
  LcdLineP(2, PSTR("kokrhacek P k"));
  // LcdLineP(2, F("kokrhacek a kdakalka"));
  // LcdLineP(2, "kokrhacek a kdakalka");
  timestamp =  micros() - timestamp;
  Serial.print("Function PROGMEM time: ");
  Serial.println(timestamp);
  lcd.print("X");
  // DisplayP.LcdLine2(1, F("kokrhacek Fstr kdakalka kokodak"));
  // DisplayP.LcdLine2(3, "kokrhacek point kdakalka kokodak");
  // strcpy(CurTime, CurTime + 9);
  // Serial.println("Test of copying inplace:");
  // Serial.println(CurTime);
}

void loop() {
  // put your main code here, to run repeatedly:

}

// Print on empty line of LC display memory based char array.
void LcdLine(uint8_t line, char *txt) {
  uint8_t ArrLen = min(strlen(txt), 20);
  lcd.setCursor(0, line);
   for (uint8_t i = 0; i < ArrLen; i++) {
    lcd.write(txt[i]);
  }
  for (uint8_t i = ArrLen; i < 20; i++) {
    lcd.write(' ');
  }
  lcd.setCursor(ArrLen, line);
}

void LcdLine3(uint8_t line, char txt[]) {
  lcd.setCursor(0, line);
  lcd.print(F("                    "));
  // strncpy(txt, txt, 20);
  if (strlen(txt) > 20) {
    txt[20] = '\0';
  }
  // Serial.println(txt);
  lcd.setCursor(0, line);
  lcd.print(txt);
}

/* // Print on empty line of LC display Progmem based char array. 
void LcdLineP(uint8_t line, const __FlashStringHelper *txt) { 
  char buffer[21];
  strncpy_PF(buffer, (const char*)txt, 20);
  size_t ArrLen = strlen(buffer);
  lcd.setCursor(0, line);
  buffer[ArrLen] = '\0';
  // if (ArrLen > 20) {
  //   lcd.print(txt);
  //   return;
  // }
  lcd.print(buffer);
  for (uint8_t i = ArrLen; i < 20; i++) {
    lcd.write(' ');
  }
  lcd.setCursor(ArrLen, line);
} */

void LcdLineP(uint8_t line, char txt[]) {
  size_t ArrLen = strlen(txt);
  lcd.setCursor(0, line);
  strncpy_PF(txt, txt, 20);
  // txt[ArrLen] = '\0';
  lcd.print(txt);
  for (uint8_t i = ArrLen; i < 20; i++) {
    lcd.write(' ');
  }
  lcd.setCursor(ArrLen, line);
}

/*
void LcdLineP(uint8_t line, char *txt) {
  size_t ArrLen = strlen(txt);
  lcd.setCursor(0, line);
  strncpy(txt, txt, 20);
  if (ArrLen > 20) {
    // DEBUG_PRINTLN("Shorting the P array");
    txt[20] = '\0';
    lcd.print(txt);
    return;
  }
  // Serial.println(txt);
  txt[ArrLen] = '\0';
  lcd.print(txt);
  for (uint8_t i = ArrLen; i < 20; i++) {
    lcd.write(' ');
  }
  lcd.setCursor(ArrLen, line);
} */

// strcpy(text, CurTime + 9);