Recommender.h (Attempt 1)

#ifndef RECOMMENDER_INCLUDED
#define RECOMMENDER_INCLUDED

#include <string>
#include <vector>

#include <unordered_set>
#include <unordered_map>

#include "Movie.h"
#include "User.h"
#include "UserDatabase.h"
#include "MovieDatabase.h"

struct MovieAndRank
{
    MovieAndRank(const std::string& id, int score)
     : movie_id(id), compatibility_score(score)
    {}

    std::string movie_id;
    int compatibility_score;
};

class Recommender
{
  public:
    Recommender(const UserDatabase& user_database,
                const MovieDatabase& movie_database);
    ~Recommender() {};
    std::vector<MovieAndRank> recommend_movies(const std::string& user_email,
                                               int movie_count) const;

  private:
      const UserDatabase* m_user_database;
      const MovieDatabase* m_movie_database;

      const int SAME_DIRECTOR_POINTS = 20;
      const int SAME_ACTOR_POINTS = 30;
      const int SAME_GENRE_POINTS = 1;

      std::unordered_map<std::string, int> create_unordered_map_linking_movies_with_compatibility(const std::string &user_email, int moive_count) const;
      std::vector<MovieAndRank> create_descending_order_vector_given_unordered_map(const User* &current_user, int movie_count, std::unordered_map<std::string, int> possible_recommend_movies) const;

      bool compare_MovieAndRank(MovieAndRank& a, MovieAndRank& b) const;
};

#endif // RECOMMENDER_INCLUDED