private IEnumerable <PhotoWithCommentsAndLikes> ParsePhotosWithCommentsAndLikes(IOrderedEnumerable <Dictionary <string, AttributeValue> > sortedResult)
{
PhotoId latestPhotoId = Guid.Empty;
List <PhotoWithCommentsAndLikes> result = new List <PhotoWithCommentsAndLikes>();
PhotoWithCommentsAndLikes currentResult = null;
List <PhotoComment> currentPhotoComments = null;
List <PhotoLikeRecord> currentPhotoLikes = null;
foreach (var item in sortedResult)
{
var photoId = PhotoId.FromDbValue(item[FieldMappings.PartitionKey].S);
string recordType = item[FieldMappings.RecordType].S;
if (latestPhotoId != photoId)
{
if (currentResult != null)
{
result.Add(currentResult);
}
currentResult = new PhotoWithCommentsAndLikes();
currentResult.Comments = (currentPhotoComments = new List <PhotoComment>());
currentResult.Likes = (currentPhotoLikes = new List <PhotoLikeRecord>());
latestPhotoId = photoId;
}
switch (recordType.ToLowerInvariant())
{
case "photo":
currentResult.Photo = Mappers.PhotoModel.FromDbItem(item);
break;
case "photocomment":
currentPhotoComments.Add(Mappers.PhotoComment.FromDbItem(item));
break;
case "photolike":
currentPhotoLikes.Add(Mappers.PhotoLike.FromDbItem(item));
break;
default:
logWriter.LogWarning($"RecordType '{recordType}' was not expected in {nameof(ParsePhotosWithCommentsAndLikes)}");
break;
}
}
if (currentResult != null)
{
result.Add(currentResult);
}
return(result);
}
private PhotoScore GetScore(PhotoWithCommentsAndLikes item)
{
double photoScore = GetPhotoScore(item.Photo);
double commentScore = GetCommentScore(item.Comments.ToArray());
double likeScore = GetLikeScore(item.Likes.ToArray());
double totalScore = photoScore + commentScore + likeScore;
return(new PhotoScore
{
PhotoId = item.Photo.PhotoId,
Score = totalScore
});
}
private double GetPhotoScore(PhotoWithCommentsAndLikes item, IList <string> decisionLog)
{
TimeSpan itemAge = system.Time.UtcNow - item.Photo.CreatedTime;
var defaultPhotoScore = GetWeightedScore(itemAge, PhotoAgeWeight);
var titleScore = !string.IsNullOrWhiteSpace(item.Photo.RawText)
? GetWeightedScore(itemAge, TitleWeight)
: 0;
decisionLog.Add($"Photo created {itemAge.GetPastTimeString()} -> score {defaultPhotoScore}");
decisionLog.Add($"RawText is '{item.Photo.RawText}', created {itemAge.GetPastTimeString()} -> score {titleScore}");
return(titleScore + defaultPhotoScore);
}
private PhotoScore GetScore(PhotoWithCommentsAndLikes item)
{
List <string> decisionLog = new List <string>();
decisionLog.Add($"Scoring for {item.Photo.PhotoId.ToDbValue()}");
double photoScore = GetPhotoScore(item, decisionLog);
double commentScore = GetCommentScore(item.Comments, decisionLog);
double likeScore = GetLikeScore(item.Likes, decisionLog);
double totalScore = photoScore + commentScore + likeScore;
decisionLog.Add($"Total score for {item.Photo.PhotoId.ToDbValue()} -> {totalScore}");
logger.LogInformation(string.Join("\n", decisionLog));
return(new PhotoScore
{
PhotoId = item.Photo.PhotoId,
Score = totalScore
});
}
