/// <summary>
/// Gets all of the recommended starting point for relevant <see cref="EventModel"/> classes.
/// </summary>
/// <param name="end">The ending <see cref="DateTime"/> for the time period to recommend.</param>
/// <param name="mode">Specifies the calculation mode to use.</param>
/// <returns>An <see cref="IEnumerable{T}"/> of all <see cref="RecommendationModel"/> classes.</returns>
public IEnumerable <RecommendationModel> GetRecommendations(DateTime end, RecommendationMode mode)
{
try
{
// Handle everything in EST (to make thing easier for now).
var estTimeZone = TimeZoneInfo.FindSystemTimeZoneById(Constants.EasternStandardTimeZoneId);
var start = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, estTimeZone);
builder
.Create(start, end)
.ConstructIterative()
.ReorderOverruns()
.SpreadBackwards();
if (mode == RecommendationMode.MinimalClustering)
{
builder.SpreadForwards();
}
return(builder
.FillEmpty()
.Build());
}
catch (Exception)
{
throw;
}
}
public IReadOnlyList <TagSearchResult> GetRecommendations(
IEnumerable <string> currentFilters,
string search,
RecommendationMode mode)
{
var filters = currentFilters.Select(filter => filter.ToLowerInvariant()).ToList();
var newFilter = search.ToLowerInvariant();
return(_lock.Read(() => _tagManager.GetRecommendations(_previewModels, filters, newFilter, mode)));
}
public IReadOnlyList <TagSearchResult> GetRecommendations(IEnumerable <ITagged> previewModels,
IEnumerable <string> currentFilters,
string search, RecommendationMode mode)
{
IEnumerable <TagSearchResult> Search()
{
if (string.IsNullOrWhiteSpace(search))
{
yield break;
}
var currentSet = currentFilters.ToHashSet();
var positiveSearch = search.TrimStart('-', ' ');
var isNotSearch = search.StartsWith("-");
var possibleTags = _trie.Find(positiveSearch)
.Select(result => result.word)
.Where(tag => !currentSet.Contains(tag));
var currentModels = Filter(previewModels, currentSet);
foreach (var tag in possibleTags)
{
if (mode == RecommendationMode.Tagging || currentModels.Count(model => model.Tags.Contains(tag)) > 0)
{
var rebuiltTag = isNotSearch ? "-" + tag : tag;
yield return(new TagSearchResult(rebuiltTag, currentModels.Count(model => model.Tags.Contains(tag))));
}
}
}
return(Search()
.OrderByDescending(result => result.MatchingItemCount)
.ToList());
}
