#include <guitar/LineParser.hpp>

int LineParser::getElement(Element &element)
{
  char ch;

  element.setFret(-1);
	element.setAction(Action::None);
  if(mPosition>=mLength)return -1;
	ch=charAt(mPosition++);
  if(::isdigit(ch)&&(ch>='0'&&ch<='9'))
	{
	  element.setAction(Action::Pick);
	  element.setFret(ch-48);
	}
	else if(::isalpha(ch))
	{
	  if('o'==ch||'O'==ch)   // instead of zero some tabs have an alpha 'O' - for (O)pen.
		{
		  element.setAction(Action::Pick);
			element.setFret(0);
			return 1;
		}
		else if('p'==ch||'P'==ch)                 // pull-off
		{
			int result=getElement(element);         // fetch the next element, this is what we are pulling into
			if(1!=result)return result;             // if we didn't get anything return;
			element.setAction(Action::PullOff);     // set action to pull-off
			return result;
		}
		else if('b'==ch||'B'==ch)                 // Bend
		{
			int result=getElement(element);         // fetch the next element, this is what we are bending into
			if(1!=result)return result;             // if we didn't get anything return;
			element.setAction(Action::Bend);        // set action to bend
			return result;
		}
		else if('h'==ch||'H'==ch)                 // hammer-on
		{
			int result=getElement(element);         // fetch the next element, this is what we are hammering onto
			if(1!=result)return result;             // if we didn't get anything return;
			element.setAction(Action::HammerOn);    // set action to hammer-on
			return result;
		}
		else if('r'==ch||'R'==ch)                 // Release(bend) into this note
		{
			int result=getElement(element);         // fetch the next element, this is what we are releasing into
			if(1!=result)return result;             // if we didn't get anything return;
			element.setAction(Action::Release);     // set action to Release
			return result;
		}
		else if('s'==ch||'S'==ch)                 // Slide
		{
			int result=getElement(element);         // fetch the next element, this is what we are sliding into
			if(1!=result)return result;             // if we didn't get anything return;
			element.setAction(Action::SlideUp);     // set action to SlideUp
			return result;
		}
		else 
		{
		  element.setAction(Action::None);        // invalid entry
			element.setFret(-1);									  // no referenced note
		  return 0;                               // return not-handled
		}
	}
	else if('^'==ch)                            // Bend
	{
		int result=getElement(element);           // fetch the next element, this is what we are bending into
		if(1!=result)return result;               // if we didn't get anything return;
		element.setAction(Action::Bend);          // set action to bend
		return result;
	}
	else if('\\'==ch)
	{
		int result=getElement(element);           // fetch the next element, this is what we are sliding into
		if(1!=result)return result;               // if we didn't get anything return;
		element.setAction(Action::SlideDown);     // set action to SlideDown
		return result;
	}
	else if('/'==ch)
	{
		int result=getElement(element);           // fetch the next element, this is what we are sliding
		if(1!=result)return result;               // if we didn't get anything return;
		element.setAction(Action::SlideUp);       // set action to SlideUp
		return result;
	}
	else 
	{
	  element.setAction(Action::None);          // invalid entry
		element.setFret(-1);										  // no referenced note								 
	  return 0;																  // return not-handled										  
	}
  ch=charAt(mPosition);

  if(!(::isdigit(ch)&&(ch>='0'&&ch<='9'))&&!(::isalpha(ch)&&'O'==ch))
	{
	  element.setAction(Action::Pick);          // fretted note
	  return 1;                                 // return handled
	}
	if('O'==ch||'o'==ch)ch='0';
	mPosition++;
	element.setFret((element.getFret()*10)+(ch-48));
	return 1;																	  // return handled
}

void LineParser::putElement(const Element &element)
{
  String strItem=Action(element.getAction()).toStringShort()+String().fromInt(element.getFret());
	*this+=strItem;
	mPosition+=strItem.length();
	return;
}

void LineParser::putElement(char ch)
{
	*this+=ch;
	mPosition++;
	return;
}

int LineParser::peekElement(Element &element)
{
  int position=mPosition;
	int result=getElement(element);
	mPosition=position;
	return result;
}