public IHttpActionResult GetRecommendedMovies(int RVisitorID)
{
var moviesBestRatedByUser = principal.MovieRatings
.Where(x => x.RVisitorID == RVisitorID).OrderByDescending(x => x.Rating).Take(3).ToList();
if (moviesBestRatedByUser.Count == 0)
{
return(Ok(new Dictionary <int, float>()
{
}));
}
Dictionary <int, dynamic> moviesInfoDict = new Dictionary <int, dynamic>();
foreach (var item in moviesBestRatedByUser)
{
moviesInfoDict.Add(item.MovieID, new
{
item.Movies.GenreID,
item.Movies.MovieDirectorID,
ActorIDs = item.Movies.MovieRoles.Select(x => x.ActorID).ToList(),
MinDist = 1.0f / (item.Rating)
});
}
var Movies = principal.Movies.Where(x => !x.IsDeleted && x.IsCurrent && !moviesInfoDict.Keys.Contains(x.MovieID)).ToList();
Dictionary <int, float> dctMoviesDistance = new Dictionary <int, float>();
Dictionary <string, float> Weights = new Dictionary <string, float>
{
{ "DifferentGenre", 1f },
{ "DifferentMovieDirector", 0.5f },
{ "ActorsNotPresent", 0.25f }
};
foreach (var moviesWatched in moviesInfoDict)
{
foreach (var moviesToWatch in Movies)
{
var ActorIDs = principal.MovieRoles.Where(x => x.MovieID == moviesToWatch.MovieID).Select(x => x.ActorID).ToList();
//var AverageRatingList = principal.MovieRatings.Where(x => x.MovieID == moviesToWatch.MovieID).ToList();
//var AverageRating = 0.0;
// if(AverageRatingList.Count>0)
// AverageRating = AverageRatingList.Average(x=>x.Rating);
VectorN objVector = new VectorN(new float[] {
Convert.ToInt32((moviesWatched.Value.GenreID != moviesToWatch.GenreID)) * Weights["DifferentGenre"],
Convert.ToInt32((moviesWatched.Value.MovieDirectorID != moviesToWatch.MovieDirectorID)) * Weights["DifferentMovieDirector"],
Convert.ToInt32((ActorIDs.Intersect((List <int>)moviesWatched.Value.ActorIDs).ToList().Count == 0)) * Weights["ActorsNotPresent"],
(float)moviesWatched.Value.MinDist + 1.0f
});
var VectorDistance = objVector.GetLength();
if (dctMoviesDistance.Keys.Contains(moviesToWatch.MovieID))
{
if (dctMoviesDistance[moviesToWatch.MovieID] > VectorDistance)
{
dctMoviesDistance[moviesToWatch.MovieID] = VectorDistance;
}
}
else
{
dctMoviesDistance.Add(moviesToWatch.MovieID, VectorDistance);
}
}
}
var dctMoviesDistanceSorted = dctMoviesDistance.OrderBy(x => x.Value).Take(10).ToDictionary(t => t.Key, t => t.Value);
return(Ok(dctMoviesDistanceSorted));
}
