#include <iostream>

using namespace std;

#include "FileReader.h"

static void printResults(string title, const set<string> &result) {
  cout << endl << title << endl;
  for ( auto &el : result ) {
    cout << "\t" << el << endl;
  }
}

int main(int argc, char* argv[]) {
  static const char pathsep = '/';

  if ( argc != 5 ) {
    cerr << "Usage: ./ex11 <directory> <top_num> <genre> <genre>" << endl;
    cerr << "Tries to read files <directory>/<genre>.txt and <directory>/excluded.txt" << endl;
    exit(EXIT_FAILURE);
  }

  string directory(argv[1]);
  directory += pathsep;

  unsigned int top_num = atoi(argv[2]);
  string genre1(argv[3]);
  string genre2(argv[4]);
  
  FileReader exclusions(directory + "excluded.txt");
  FileReader fOne(top_num, directory + genre1 + ".txt", exclusions);
  FileReader fTwo(top_num, directory + genre2 + ".txt", exclusions);

  printResults(genre1 + " - " + genre2, (fOne - fTwo).set() );
  printResults(genre2 + " - " + genre1, (fTwo - fOne).set() );
  printResults(genre1 + " intersect " + genre2, (fTwo ^ fOne).set() );

}