// ==========================================================================
// $Id: readfile.cpp,v 1.1 2016/11/21 17:38:46 jlang Exp $
// CSI2372 example Code for lecture 9
// ==========================================================================
// (C)opyright:
//
//   Jochen Lang
//   EECS, University of Ottawa
//   800 King Edward Ave.
//   Ottawa, On., K1N 6N5
//   Canada. 
//   http://www.eecs.uottawa.ca
// 
// Creator: jlang (Jochen Lang)
// Email:   jlang@eecs.uottawa.ca
// ==========================================================================
// $Log: readfile.cpp,v $
// Revision 1.1  2016/11/21 17:38:46  jlang
// Created simple file parser example.
//
// ==========================================================================


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

using namespace std;

#if 0
// Separate insertion and extraction as templates

template<class T> class Point2D; 

template<class T> 
istream& operator>>( istream&, Point2D<T>& );

template<class T> 
ostream& operator<<( ostream&, const Point2D<T>& );


template<class T>
class Point2D {
  T x;
  T y;
public:
  friend istream& operator>> <>( istream&, Point2D& );

  friend ostream& operator<< <>( ostream&, const Point2D& );
};


template <class T>
istream& operator>> ( istream& is, Point2D<T>& p ) {
    char tmp;
    is >> tmp >> p.x >> tmp >> p.y >> tmp;
    if ( is.fail() ) {
      p = Point2D<T>();
    }
    return is;
  }

template <class T>
ostream& operator<< ( ostream& os, const Point2D<T>& p ) {
  os << "( " << p.x << ", " << p.y << " )";
}
#else
// Compact with insertion and extraction as non-templates

template<class T>
class Point2D {
  T x;
  T y;
public:
  friend istream& operator>> ( istream& is, Point2D<T>& p ) {
    char tmp;
    is >> tmp >> p.x >> tmp >> p.y >> tmp;
    if ( is.fail() ) {
      p = Point2D<T>();
    }
    return is;
  }
  friend ostream& operator<< ( ostream& os, const Point2D<T>& p ) {
    os << "( " << p.x << ", " << p.y << " )";
  }
};
#endif
  
int main() {
  string fn{"geom2D.txt"};
  ifstream in(fn);
  if (!in) {
    cerr << "Could not open file: " << fn << endl;
    return -1;
  }
  string line, token;
  // Get a line
  while (getline(in, line)) {
    istringstream streamLine(line);
    cout << "Got line: " << line << endl;
    // Get individual white space separated tokens
    while ( streamLine >> token ) {
      // Process token
      if ( token == "point" ) {
	Point2D<float> p;
	streamLine >> p;
	cout << "Point coordinates: " << p << endl;
	break;
      }
      if ( token == "line" ) {
	Point2D<float> pS, pE;
	streamLine >> pS >> pE;
	cout << "Line segment: " << pS << " " << pE << endl;
	break;
      }
      if ( token == "triangle" ) {
	Point2D<float> pA, pB, pC;
	streamLine >> pA >> pB >> pC;
	cout << "Triangle: " << pA << " " <<  pB << " " << pC << endl;
	break;
      }
      if ( token == "end" ) break;
      cerr << "Unknown token!" << endl;
    } 
    if ( token == "end" ) break;
  }
}