public async Task <FeedItem> RefreshFeedItem(FeedItem feedItem)
{
try
{
if (feedItem != null)
{
//get new episodes from saved URI in feedItem
var doc = await RssFeedHelper.GetXDocFromLinkAsync(feedItem.Link);
//update ImageLink and ImageFileName for FeedItem
var feedItemFromXDoc = FeedItemManager.GetFeedItemFromXDoc(doc, feedItem.Link);
feedItem.ImageLink = feedItemFromXDoc.ImageLink; //new image on FeedItem for new episode
feedItem.ImageFileName = feedItemFromXDoc.ImageFileName;
feedItem.LastCheck = DateTime.Now; //save LastCheck
var result = await DataStore.SaveFeedItemAsync(feedItem);
if (result == 0)
{
Debug.WriteLine("Could Not update FeedItem with new LastCheck date");
}
//get new episodes from saved URI in feedItem
var episodes = RssEpisodeManager.GetRssEpisodesFromXDoc(doc, feedItem.Id.Value);
//save new episodes to database
result = await DataStore.AddEpisodesToFeed(episodes); //returns the number of items added
if (result == 0)
{
Debug.WriteLine("FeedItemManager.RefreshFeedItem Result from AddEpisodesToFeed was 0 ");
}
//check existing episodes for undownloaded images
var existingEpisodes = await DataStore.GetAllEpisodeItemsByFeedIdAsync((int)feedItem.Id);
foreach (var episode in existingEpisodes)
{
if (DownloadService.CanDownloadImage(episode)) //check if image is already downloaded
{
await DownloadService.Instance.DownloadImageAsync(episode); //queue to download
}
}
}
}
catch (Exception ex)
{
//could not refresh item
Debug.WriteLine("FeedItemManager.RefreshFeedItem Error " + ex.Message);
}
return(feedItem);
}
public async Task ExecuteNewFeedItemCommand()
{
IsBusy = true;
try
{
var doc = await RssFeedHelper.GetXDocFromLinkAsync(Link);
if (doc != null)
{
var newFeedItem = FeedItemManager.GetFeedItemFromXDoc(doc, Link);
if (newFeedItem != null)
{
var successFeedImage = await FileHelper.DownloadImageFile(newFeedItem.ImageLink);
if (!successFeedImage)
{
Debug.WriteLine("Could not download feed image file " + newFeedItem.ImageLink);
}
var result = await DataStore.SaveFeedItemAsync(newFeedItem);
if (newFeedItem.Id != null)
{
//defensive programming, delete any existing records for this new FeedItem.Id
//this is because Ids get reused and not all the episodes in and Id might get deleted
try
{
result = await DataStore.DeleteAllEpisodesByFeedIdAsync(newFeedItem.Id); //don't care about the result
}
catch (Exception ex)
{
Debug.WriteLine("Info Error Deleting Episodes before adding new Feed Item " + ex.Message);
}
var episodeList = RssEpisodeManager.GetRssEpisodesFromXDoc(doc, newFeedItem.Id.Value); //get the episodes
result = await DataStore.SaveEpisodeListAsync(episodeList); //save the episodes
//get the images
var count = 0;
var lastImageLink = "";
foreach (var episode in episodeList)
{
if (lastImageLink != episode.ImageLink)
{ //don't try to download when the image is the same from episode to episode
lastImageLink = episode.ImageLink;
await DownloadService.Instance.DownloadImageAsync(episode);
}
count++;
//if (count > 20) break; //only get 20, not like 1000
}
MessagingCenter.Send(newFeedItem, "AddFeedItem");
}
else
{
//newFeedItem.Id was null
Debug.WriteLine("newFeedItem.Id was null");
}
}
else
{
//newFeedItem was null
Debug.WriteLine("newFeedItem was null");
}
}
else
{
//problem getting feed
await Application.Current.MainPage.DisplayAlert("Alert", "Could not get RSS Feed from Link", "OK");
}
}
catch (Exception ex)
{
//could not delete item
Debug.WriteLine("Could not Add Podcast Feed Item " + ex.Message);
}
finally
{
IsBusy = false;
}
}
