public async Task<List<ElectionArticle>> GetElectionArticlesAfterAsync (ElectionArticle latestArticle, Priority priority)
{
List<ElectionArticle> articles = new List<ElectionArticle>();
Task<List<ElectionArticle>> getArticlesTask;
var timestamp = latestArticle.CreatedAt.ToUnixTimestamp ();
switch (priority) {
case Priority.Background:
getArticlesTask = _apiService.Background.GetElectionArticlesAfter (timestamp, ApiService.Device);
break;
case Priority.UserInitiated:
getArticlesTask = _apiService.UserInitiated.GetElectionArticlesAfter (timestamp, ApiService.Device);
break;
case Priority.Speculative:
getArticlesTask = _apiService.Speculative.GetElectionArticlesAfter (timestamp, ApiService.Device);
break;
default:
getArticlesTask = _apiService.UserInitiated.GetElectionArticlesAfter (timestamp, ApiService.Device);
break;
}
if (CrossConnectivity.Current.IsConnected)
{
articles = await Policy
.Handle<WebException> ()
.WaitAndRetryAsync (2, retryAttempt => TimeSpan.FromSeconds (Math.Pow (2, retryAttempt)))
.ExecuteAsync(async () => await getArticlesTask);
}
return articles.Select(article => {
if (article.Type == ElectionArticle.MediaType.Video)
{
article.VideoImageUrl = YoutubeHelper.GetThumbnailUrl(ApiService.Device, article.VideoUrl);
article.VideoId = YoutubeHelper.GetVideoId(article.VideoUrl);
}
else if (article.Type == ElectionArticle.MediaType.Image)
{
article.ImageUrl = ApiService.ApiBaseAddress + article.ImageUrl;
}
return article;
}).ToList();
}
public ElectionArticleItemViewModel(ElectionArticle model, Action<ElectionArticleItemViewModel> gotoCommand, bool addIndex = false)
{
Model = model;
Id = model.Id;
Title = model.Title;
Body = model.Body;
MediaType = model.Type;
VideoUrl = model.VideoUrl;
VideoImageUrl = model.VideoImageUrl;
VideoId = model.VideoId;
ImageUrl = model.ImageUrl;
CreatedAt = model.CreatedAt;
GoToCommand = ReactiveCommand.Create ();
GoToCommand.Subscribe (x => gotoCommand (this));
if (addIndex)
{
_latestIndex += 1;
Index = _latestIndex;
}
}