Recommender.h

#ifndef RECOMMENDER_INCLUDED
#define RECOMMENDER_INCLUDED

#include <string>
#include <vector>
#include "UserDatabase.h"
#include "MovieDatabase.h"

class UserDatabase;
class MovieDatabase;

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)
    :m_user_database(user_database), m_movie_database(movie_database) {}
    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;
    bool isRankedHigherThan(const MovieAndRank& m1, const MovieAndRank& m2) const;
};

#endif // RECOMMENDER_INCLUDED