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package recommended
import (
"math"
"github.com/animenotifier/arn"
)
func getAnimeAffinity(anime *arn.Anime, animeListItem *arn.AnimeListItem, completed *arn.AnimeList, bestGenres []string) float64 {
animeAffinity := anime.Score()
// Planned anime go higher
if animeListItem != nil && animeListItem.Status == arn.AnimeListStatusPlanned {
animeAffinity += 10.0
}
// Anime whose high-ranked prequel you did not see are lower ranked
prequels := anime.Prequels()
for _, prequel := range prequels {
item := completed.Find(prequel.ID)
// Filter out unimportant prequels
if prequel.Score() < anime.Score()/2 {
continue
}
if item == nil {
animeAffinity -= 20.0
}
}
// Give favorite genre bonus if we have enough completed anime
if len(completed.Items) >= genreBonusCompletedAnimeThreshold {
bestGenreCount := 0
for _, genre := range anime.Genres {
if arn.Contains(bestGenres, genre) {
bestGenreCount++
}
}
// Use square root to dampen the bonus of additional best genres
animeAffinity += math.Sqrt(float64(bestGenreCount)) * 7.0
}
return animeAffinity
}