public async Task <ActionResult <HeadlinesResponse> > SearchHeadlines(
[FromQuery(Name = "term")] string term,
[FromHeader(Name = "annotation-session")] string sessionToken,
[FromQuery(Name = "sentiment")] HeadlineSentiment sentiment = HeadlineSentiment.POSITIVE,
[FromQuery(Name = "page")] int page = 1,
[FromQuery(Name = "limit")] int limit = 10)
{
if (page <= 0)
{
return(BadRequest("Page must be greater than 0"));
}
var offset = (page - 1) * limit;
var headlines =
await _headlineRepository.SearchHeadlines(sentiment, term, limit, offset);
var count = await _headlineRepository.SearchHeadlinesCount(sentiment, term);
foreach (var headline in headlines)
{
headline.Annotations = FilterHeadlineAnnotations(headline, sessionToken);
}
return(new HeadlinesResponse
{
Headlines = (System.Collections.Generic.IList <Models.DBModels.INewsHeadline>)headlines,
Count = count
});
}
public async Task <int> SearchHeadlinesCount(HeadlineSentiment sentiment, string term)
{
var isPositive = sentiment == HeadlineSentiment.POSITIVE;
var predictedClass = isPositive ? 1 : 0;
var count = await _headlines
.Find(
h => h.PredictedClass == predictedClass &&
h.Headline.ToLower().Contains(term.ToLower())
).CountDocumentsAsync();
return((int)count);
}
public async Task <int> FetchHeadlinesBySentimentCount(HeadlineSentiment sentiment, int dateOffset)
{
var predictedClass = sentiment == HeadlineSentiment.POSITIVE ? 1 : 0;
var targetDate = DateTime.Now.AddDays(-1 * dateOffset).Date;
var endDate = targetDate.AddDays(1).Date;
var count = await _headlines
.Find(
h => h.PublishedAt >= targetDate &&
h.PublishedAt < endDate &&
h.PredictedClass == predictedClass
).CountDocumentsAsync();
return((int)count);
}
public async Task <IList <INewsHeadline> > SearchHeadlines(
HeadlineSentiment sentiment, string term, int limit = 10, int offset = 0)
{
var isPositive = sentiment == HeadlineSentiment.POSITIVE;
var predictedClass = isPositive ? 1 : 0;
var filter = _headlines
.Find(
h => h.PredictedClass == predictedClass &&
h.Headline.ToLower().Contains(term.ToLower())
).Limit(limit).Skip(offset);
var headlines = isPositive ?
await filter.SortByDescending(h => h.SemanticValue).ToListAsync() :
await filter.SortBy(h => h.SemanticValue).ToListAsync();
return(headlines.Cast <INewsHeadline>().ToList());
}
public async Task <ActionResult <HeadlinesResponse> > GetHeadlinesByDay(
[FromQuery(Name = "sentiment")] HeadlineSentiment sentiment,
[FromQuery(Name = "limit")] int limit, [FromQuery(Name = "page")] int page,
[FromQuery(Name = "date")] DateTime dateTime,
[FromHeader(Name = "annotation-session")] string sessionToken)
{
if (page <= 0)
{
return(BadRequest("Page must be greater than 0"));
}
var today = DateTime.Now;
if (dateTime == new DateTime())
{
dateTime = today;
}
if (dateTime > today)
{
return(BadRequest("Date cannot be in the future"));
}
var dateOffset = (today - dateTime).TotalDays;
var offset = (page - 1) * limit;
var headlines =
await _headlineRepository.FetchHeadlinesBySentiment(sentiment, (int)dateOffset, limit, offset);
var count = await _headlineRepository.FetchHeadlinesBySentimentCount(sentiment, (int)dateOffset);
foreach (var headline in headlines)
{
headline.Annotations = FilterHeadlineAnnotations(headline, sessionToken);
}
return(new HeadlinesResponse
{
Headlines = headlines,
Count = count
});
}
public async Task <IList <INewsHeadline> > FetchHeadlinesBySentiment(
HeadlineSentiment sentiment, int dateOffset, int limit = 10, int offset = 0)
{
var isPositive = sentiment == HeadlineSentiment.POSITIVE;
var predictedClass = isPositive ? 1 : 0;
var targetDate = DateTime.Now.AddDays(-1 * dateOffset).Date;
var endDate = targetDate.AddDays(1).Date;
var filter = _headlines
.Find(
h => h.PublishedAt >= targetDate &&
h.PublishedAt < endDate &&
h.PredictedClass == predictedClass
).Limit(limit).Skip(offset);
var headlines = isPositive ?
await filter.SortByDescending(h => h.SemanticValue).ToListAsync() :
await filter.SortBy(h => h.SemanticValue).ToListAsync();
return(headlines.Cast <INewsHeadline>().ToList());
}
