// COMPILE:
// g++ -o ~/bin/tfs2csv2 ~/src/tfs2csv2.cpp

#include <fstream>
#include <sstream>
#include <iostream>

using namespace std;

///////////////////////////////////////////////////////
////			Declarations			////
/////////////////////////////////////////////////////_____________________________________________________________________________________
stringstream sline;									// Per-line string stream
string temp;												// Temporary string
string outfile;											// Output file name

string csvExt(string filename);						// Function to replace/add extension to .csv

///////////////////////////////////////////////////////
////				Main					////
/////////////////////////////////////////////////////_____________________________________________________________________________________
int main(int argc, char *argv[])
{

///// Cmd Line Args		/////

if((argc != 2)&&(argc != 3))						// If infile and optionally outfile are not specified print usage and exit(1).
{
	cout << "Usage: " << endl;
	cout << "\ttfs2csv [infile]" << endl;
	cout << "\ttfs2csv [infile] [outfile]" << endl;
	exit(1);
}

if(argc == 2)											// If infile specified but no outfile, convert infile name to .csv and use as outfile
{
	outfile = csvExt(argv[1]).c_str();
}

if(argc == 3)											// If infile and outfile specified, just use outfile as output
{
	outfile = argv[2];
}

///// Open Files			/////

ifstream in(argv[1]);									// Open infile
ofstream out(outfile.c_str());						// Open outfile

///// Conversion			/////

while(in)													// While in has not reached End Of File...
{
	temp.clear();										// Ensure temp is empty - don't want to append to it
	getline(in,temp);									// Read a line (until \n) of input file to temporary string
	
	if((temp[0]=='@')||(temp[0]=='$'))
	{
		temp.clear();
		continue;										// ignore lines beginning with @ or $ (eliminate blurb)
	}
	
	sline << temp;										// Read string into stream for manipulation
	
	while(sline)											// Just to make sure you don't hit the end of the line prematurely, despite the "if" later
	{
		temp.clear();									// Ensure temp is empty again
		sline >> temp;									// Read the next word of the line into the temporary string
		if(temp!="*")									// Ignore * before column names
		{
			out << temp;									// Read the string out to the output file
		}

		if((temp!="*")&&(sline.peek() != EOF)){out << ',';}		// Look one character ahead of current word - if it's the start of another word, output a comma separator
		else 												// If the next character is the end of the file...
		{
			continue;									// ...break out of the while without outputting a comma (so no commas at line ends)
		}
			
	}
	
	sline.clear();										// Clear sline for next loop
	temp.clear();										// Clear temp for next loop
	out << endl;										// Output a new line

}

///// Close Files			/////

in.close();												// Close input file
out.close();												// Close output file

}

///////////////////////////////////////////////////////
////				Functions			////
/////////////////////////////////////////////////////_____________________________________________________________________________________
string csvExt(string filename)						// Function to automatically generate a filename from file.ext or file to file.csv
{
	string output = filename;						// Output string. Set to input string and modify (to preserve input string in case it has no .ext - see later)
	bool ext = false;									// Boolean to set depending on whether input file is found to have an extension
	
	for(int i = output.size() - 1; i >= 0; --i)		// Start at end, work backwards until '.' is found (to ignore any previous points in name)
	{
		if(output[i] == '.') 							// If current character is a point...
		{
			ext = true;									// ...say an extension has been found...
			break;										// ...and break from loop.
		}
		else												// If not...
		{
			output.erase(i);							// ...erase character.
		}
	}														// Erases characters until point is found.
	
	if(ext)												// If a point WAS found, we can just append 'csv' onto the end of the string.
	{
		output.append("csv");
	}
	else													// If one wasn't, we've deleted the whole string. Oops.
	{
		output = filename;							// So reset it...
		output.append(".csv");						// ...and append '.csv'.
	}
	
	return output;
}