public async Task LoadTopStoriesArticlesAsync()
{
if (TopStoriesArticles == null)
{
TopStoriesArticles = new List <Article>();
}
try
{
var articles = await DatabaseOperations.GetInstance().GetCategoryArticlesAsync(TopStories);
if (articles != null && articles.Count > 0)
{
articles = articles.OrderByDescending(o => o.PublishDate).ToList();
foreach (var article in articles)
{
if (TopStoriesArticles.Find(o => o.ArticleId == article.ArticleId) == null)
{
TopStoriesArticles.Add(article);
}
}
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("DataService:" + exception);
}
}
IsRefreshingTopNewsArticles = false;
NotifyDataRefreshed(DataType.TopStoriesArticles, true);
IsTopStoriesLoaded = true;
}
public async Task <Article> GetArticlesFromId(string id, string category)
{
try
{
switch (category)
{
case TopStories:
if (TopStoriesArticles == null)
{
return(null);
}
if (TopStoriesArticles.Count == 0)
{
await LoadTopStoriesArticlesAsync();
}
return(TopStoriesArticles != null?TopStoriesArticles.Find(o => o.ArticleId == id) : null);
case BreakingNews:
return(BreakingNewsArticles != null?BreakingNewsArticles.Find(o => o.ArticleId == id) : null);
default:
return(Articles != null?Articles.Find(o => o.ArticleId == id) : null);
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("DataService:" + exception);
}
return(null);
}
}
private async Task UpdateStories(Article article)
{
try
{
if (article != null && HeadLineArticle != null && article.ArticleId == HeadLineArticle.ArticleId)
{
HeadLineArticle = article;
SaveHeadLine();
}
var temp = TopStoriesArticles.Find(o => article != null && o.ArticleId == article.ArticleId);
if (temp != null)
{
temp = article;
await SaveTopStoriesArticle(temp);
}
temp = null;
temp = BreakingNewsArticles.Find(o => article != null && o.ArticleId == article.ArticleId);
if (temp != null)
{
temp = article;
await SaveBreakingNewsArticleAsync(temp);
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("DataService:" + exception);
}
}
}
public Article GetPreviousArticle()
{
try
{
if (CurrentArticle != null && CurrentArticle.Category == TopStories)
{
if (TopStoriesArticles == null)
{
return(null);
}
var index = TopStoriesArticles.FindIndex(o => o.ArticleId == CurrentArticle.ArticleId);
return(index == 0
? TopStoriesArticles[TopStoriesArticles.Count - 1]
: TopStoriesArticles[index - 1]);
}
else if (CurrentArticle != null && CurrentArticle.Category == BreakingNews)
{
if (BreakingNewsArticles == null)
{
return(null);
}
var index = BreakingNewsArticles.FindIndex(o => o.ArticleId == CurrentArticle.ArticleId);
return(index == 0 ? BreakingNewsArticles[BreakingNewsArticles.Count - 1] : BreakingNewsArticles[index - 1]);
}
else
{
if (Articles == null)
{
return(null);
}
var index = Articles.FindIndex(o => o.ArticleId == CurrentArticle.ArticleId);
return(index == 0 ? Articles[Articles.Count - 1] : Articles[index - 1]);
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("DataService:" + exception);
}
}
return(null);
}
private void UpdateTopStoriesArticles()
{
try
{
var newArticles = new List <Article>();
if (_dataService.TopStoriesArticles == null || _dataService.TopStoriesArticles.Count <= 0)
{
return;
}
if (_dataService.TopStoriesArticles.Count >= 10)
{
newArticles = new List <Article>(_dataService.TopStoriesArticles.GetRange(0, 10));
}
else
{
newArticles = new List <Article>(_dataService.TopStoriesArticles);
}
if (newArticles.Count <= 0)
{
return;
}
newArticles = newArticles.OrderBy(x => x.PublishDate).ToList();
if (TopStoriesArticles == null)
{
TopStoriesArticles = new ObservableCollection <Article>();
}
foreach (var article in newArticles)
{
if (TopStoriesArticles.FirstOrDefault(o => o.ArticleId == article.ArticleId) == null)
{
TopStoriesArticles.Insert(0, article);
}
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("MainViewModel:" + exception);
}
}
}
public void RefreshTopNews()
{
if (TopStoriesArticles == null)
{
TopStoriesArticles = new ObservableCollection <Article>();
}
var expectedCount = TopStoriesArticles.Count + BatchSize;
if (_dataService.TopStoriesArticles.Count > expectedCount)
{
var newArticles = _dataService.TopStoriesArticles.GetRange(TopStoriesArticles.Count, BatchSize);
foreach (var article in newArticles)
{
if (TopStoriesArticles.FirstOrDefault(o => o.ArticleId == article.ArticleId) == null)
{
TopStoriesArticles.Add(article);
}
}
}
_moreTopStoriesAvailable = expectedCount == TopStoriesArticles.Count;
}
public async Task RefreshTopArticlesAsync(bool isForce, int page = 0)
{
try
{
var presentTime = DateTime.UtcNow;
var refresh = false;
refresh = await CanRefreshCategoryAsync(TopStories);
if (refresh || isForce || page != 0)
{
if (!IsRefreshingTopNewsArticles || isForce || page != 0)
{
IsRefreshingTopNewsArticles = true;
var topNews = await _theHinduClient.GetTopArticlesAsync(page);
if (topNews != null && topNews.Count > 0)
{
HeadLineArticle = topNews[0];
if (HeadLineArticle != null && !string.IsNullOrEmpty(HeadLineArticle.Thumbnail))
{
HeadLineArticle.HdThumbnail = HeadLineArticle.Thumbnail.Replace("i.jpg", "e.jpg");
}
topNews = topNews.OrderByDescending(o => o.PublishDate).ToList();
foreach (var newArticle in topNews)
{
newArticle.Category = TopStories;
if (TopStoriesArticles.Find(o => o.ArticleId == newArticle.ArticleId) == null)
{
TopStoriesArticles.Add(newArticle);
}
else
{
var oldArticle = TopStoriesArticles.Find(o => o.ArticleId == newArticle.ArticleId);
if (oldArticle != null && oldArticle.FullDescription != newArticle.FullDescription)
{
oldArticle.FullDescription = newArticle.FullDescription;
}
}
}
IsTopStoriesLoaded = true;
await DatabaseOperations.GetInstance().UpdateCategoryLastAccessedValueAsync(TopStories, DateTime.UtcNow);
SaveHeadLine();
await SaveTopStoriesArticlesAsync();
}
}
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("DataService:" + exception);
}
}
TopStoriesArticles = TopStoriesArticles.OrderByDescending(o => o.PublishDate).ToList();
IsRefreshingTopNewsArticles = false;
NotifyDataRefreshed(DataType.TopStoriesArticles, true);
}
