#ifndef PROJECT2_INC_GRAPH_HPP
#define PROJECT2_INC_GRAPH_HPP

#include <set>		// set<int>.find()
#include <string> 	// string -- not used?
#include <vector> 	// vector<int>, vector<vector<int>

typedef std::vector<std::vector<int>> matrix;

class graph {
  public:
   // Constructors
   graph () {}
   // Initializers:
   //   Read a graph from a file
   int read (std::string filename);
   //   Error codes given off by read ()
   enum ERROR { INVALID_PROCESSES = 0b000001,
                INVALID_RESOURCES = 0b000010,
                INVALID_COUNTS    = 0b000100,
                INVALID_ROWS      = 0b001000,
                INVALID_COLUMNS   = 0b010000,
                INVALID_FILENAME  = 0b100000 };

   // check functions:
   //   is the graph...
   bool reducible (); // ?
   bool knotted ();   // ?
   

   // miscellaneous functions:
   //   print the graph
   void print ();
	bool DFS( int node, std::set<int>&visited, int parent );
	bool detectKnot();
	
  private:
   int num_processes = 0;
   int num_resources = 0;
   std::vector<int> resource_counts;
   matrix m; // Tell me, Mr. Anderson, what good is a phone call if you are unable to speak?
};

#endif // PROJECT2_INC_GRAPH_HPP