ratings.h

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#pragma once
 
#include <config.h>
 
#include "lookup.h"
 
enum class RatingScheme {
    NOBODY,     
    INDIVIDUAL, 
    OWNER       
};
 
enum class Rating {
    UNRATED,     
    REPUGNANT,   
    AWFUL,       
    BAD,         
    POOR,        
    LACKLUSTER,  
    NEUTRAL,     
    OKAY,        
    GOOD,        
    EXCELLENT,   
    SUPERB       
};
 
inline constexpr float ratingAsFloat (Rating rating) {
    return (((float)(rating)) / 2);
}
 
class RatingAverager {
    unsigned count = 0; 
    unsigned total = 0; 
public:
    inline void add (Rating rating) {
        if (rating != Rating::UNRATED) {
            count++;
            total += static_cast <int> (rating);
        }
    }
    float operator ()(Rating default_value = Rating::UNRATED) {
        return (count ? (static_cast <float> (total) / static_cast <float> (count * 2))
                : ratingAsFloat (default_value));
    }
    double rating (Rating default_value = Rating::UNRATED) {
        return (count ? (static_cast <double> (total) / static_cast <double> (count))
                : static_cast <double> (default_value));
    }
    inline unsigned sum () const { return total; };
    inline unsigned items () const { return count; };
 
};
 
 
Rating floatToRating (float rating);
 
typedef struct rating_lookup_t {
    Rating value;
    const char *name;
} RATING_LOOKUP;
 
class RatingLookup : public LookupTable<Rating, RATING_LOOKUP> {
    typedef LookupTable<Rating, RATING_LOOKUP> base_class;
public:
    using base_class::LookupTable;
    bool tryGetPrecise (const char *s, float *rating) const noexcept;
    inline bool tryGetPrecise (const std::string &s, float *rating) const noexcept {
        return tryGetPrecise (s.c_str(), rating);
    }
    float getPrecise (const char *s) const;
    inline float getPrecise (const std::string &s) const {
        return getPrecise (s.c_str());
    }
    virtual const RATING_LOOKUP *get (const char *s) const noexcept override;
};
 
extern const RatingLookup RATINGS;