public async Task <MovieRankResponse> GetMovieRank(string movieName, CancellationToken cancellationToken)
{
var movieResponses = await _movieRankRepository.GetMoviesRank(movieName, cancellationToken);
if (movieResponses == null || !movieResponses.Any())
{
throw new InvalidOperationException($"movieName '{movieName}' doesn't exist!");
}
var overallRanking = Math.Round(movieResponses.Select(r => r.Ranking).Average());
return(new MovieRankResponse()
{
MovieName = movieName,
OverallRanking = overallRanking
});
}