/*
  Define one function to control all of the layout.
  It works per line with only one variable (tick).
  This one gives a way of scrolling through text.

*/

void layout(unsigned int tick) {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setTextWrap(false);
  
  updateLine1(tick);
  updateLine2(tick);
  updateLine3(tick);
  updateLine4(tick);
  
  display.display();
}
void updateLine1(unsigned int tick) {
  //reset line
  display.drawRect(0, 0, display.width(), 8, BLACK);
  display.setCursor(0, 0);
  // First line (20)
  if (volume < 100 ) display.print(' ');
  display.print(volume);
  display.print(F("% "));
  display.print(F("|mm:ss/mm:ss|"));
  display.print(F(" "));
  if (repeat) display.print('r');
  else display.print('-');
  if (shuffle) display.print('z');
  else display.print('-');
  
}
void updateLine2(unsigned int tick) {
  //reset line
  display.drawRect(0, 8, display.width(), 16, BLACK);
  display.setCursor(0, 8);
  display.print(textscroll(title,tick));
  display.startscrollleft(0x06, 0x0F);
  
}
void updateLine3(unsigned int tick) {
  //reset line
  display.drawRect(0, 16, display.width(), 24, BLACK);
  display.setCursor(0, 16);
  display.print(textscroll(artist, tick));
  
}
void updateLine4(unsigned int tick) {
  //reset line
  display.drawRect(0, 24, display.width(), 32, BLACK);
  display.setCursor(0, 24);
  display.print(textscroll(album, tick));
}

String textscroll(String text, unsigned int tick) {
    int chars = 21;
    int len = text.length();
    String newstring = "";
    
    if ( len < chars) return text;
    
    text = text + " - ";
    for ( int i = 0; i < chars; i++ )
      newstring += text.charAt((tick + i) % (len+3));
      
    return newstring;
}

int calcMaxTicks() {
     maxticks = title.length() * artist.length() * album.length();
     return maxticks;
}