#include <guitar/TabLines.hpp>
#include <guitar/FrettedNote.hpp>
#include <guitar/Fretboard.hpp>
#include <guitar/TabEntry.hpp>
#include <guitar/GlobalDefs.hpp>

// returns -1 on error, 1 if added to entry, 0 otherwise

int TabLines::firstElement(TabEntry &entry,Fretboard &fretboard)
{
  TabElement element;

  entry.remove();
	for(int index=0;index<NumLines;index++)
	{
	  operator[](index).reset();
		if(-1==operator[](index).getElement(element[index]))return -1;
	}
	if(!haveElement(element))return 0;
	synchronize();
	insert(entry,element,fretboard);
	return 1;
}

int TabLines::nextElement(TabEntry &entry,Fretboard &fretboard)
{
  TabElement element;

	entry.remove();
	for(int index=0;index<NumLines;index++)
	  if(-1==operator[](index).getElement(element[index]))return -1;
	if(!haveElement(element))return 0;
	synchronize();
	insert(entry,element,fretboard);
	return 1;
}

void TabLines::synchronize(void)
{
  int maxPos;
	int index;

	for(index=0;index<NumLines;index++)
	{
	  if(!index)maxPos=operator[](0).getPosition();
	  if(operator[](index).getPosition()>maxPos)maxPos=operator[](index).getPosition();
	}
	for(index=0;index<NumLines;index++)
	{
	  while(operator[](index).getPosition()!=maxPos)(operator[](index))++;
	}
}

void TabLines::insert(TabEntry &entry,TabElement &elements,Fretboard &fretboard)
{
  for(int index=0;index<NumLines;index++)
	{
	  Element &element=elements[index];
    if(!validate(element))continue;
    entry.insert(&FrettedNote(fretboard.getAt((NumLines-1)-index,element.getFret()),(NumLines-1)-index,element.getFret(),element.getAction()));
	}  
}

bool TabLines::haveElement(TabElement &elements)const
{
  for(int index=0;index<NumLines;index++)
	{
	  Element &element=elements[index];
		if(Action::None!=element.getAction())return true;
	}
	return false;
}

bool TabLines::validate(Element &element)const
{
	if(Fretboard::isValidFret(element.getFret())&&
	  Action::None!=element.getAction())return true;
	return false;
}