public void ExecuteDownloadCommand(RssEpisode episode)
{
IsBusy = true;
try
{
if (episode != null && episode.Id != null)
{
if (DownloadService.CanDownloadPodcast(episode))
{
DownloadService.Instance.DownloadPodcast(episode); //fires message center messages
}
else
{
Debug.WriteLine("RssEpisodeListViewModel.ExecuteDownloadCommand CanDownload was false ");
}
}
else
{
Debug.WriteLine("RssEpisodeListViewModel.ExecuteDownloadCommand episode or episode id was null ");
}
}
catch (Exception ex)
{
//could not delete item
Debug.WriteLine("RssEpisodeListViewModel.ExecuteDownloadCommand Could not Download Podcast File " + ex.Message);
}
finally
{
IsBusy = false;
}
}
private async Task DownloadPodcastFileAsync(RssEpisode episode)
{
try
{
episode.PlayPauseDownloadIcon = IconFont.Clock;
//save download status to the database
var resultSave = await DataStore.SaveEpisodeItemAsync(episode, true); //returns the number of items changed
if (resultSave != 1)
{
Debug.WriteLine("DownloadService.DownloadPodcastFile Could not Update episode");
}
//download the file to storage
var filePath = FileHelper.GetPodcastPath(episode.PodcastFileName);
var message = new DownloadMessage
{
Id = episode.Id.Value, //needed to update RssEpisode when done
Url = episode.EnclosureLink,
FilePath = filePath,
QueueType = QueueType.PodcastFile
};
MessagingCenter.Send(message, "Download"); //goes to Android project Service, returns thru DownloadFinishedMessage
}
catch (Exception ex)
{
Debug.WriteLine("DownloadService.DownloadPodcastFile Error " + ex.Message);
}
}
//************************************** Static Utility Functions ********************************************
public static bool CanDownloadPodcast(RssEpisode episode)
{
var result = false;
try
{
if (episode.Id != null)
{
if (episode.IsDownloaded != IsDownloadedEnum.Downloaded)
{
var filePath = FileHelper.GetPodcastPath(episode.PodcastFileName);
var fileExists = File.Exists(filePath);
if (!fileExists)
{
result = true;
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine("DownloadService.CanDownloadPodcast failed " + ex.Message);
}
return(result);
}
public async Task <int> SaveEpisodeItemAsync(RssEpisode item, bool doPublish = false)
{
if (episodes == null)
{
episodes = new List <RssEpisode>();
}
var result = 0;
if (item.Id != null && item.Id != 0)
{
var oldItem = episodes.Where((RssEpisode arg) => arg.Id == item.Id).FirstOrDefault();
episodes.Remove(oldItem);
episodes.Add(item);
result = await Database.UpdateAsync(item);
}
else
{
var maxId = await GetMaxRssEpisodeId();
item.Id = maxId + 1;
episodes.Add(item);
result = await Database.InsertAsync(item);
}
if (result > 0 && doPublish)
{
var updateEpisodeMessage = new UpdateEpisodeMessage
{
RssEpisode = item
};
MessagingCenter.Send(updateEpisodeMessage, "UpdateEpisodeMessage"); //goes to listening ViewModels that can download
}
return(result);
}
private QueueItem FetchQueueItem(RssEpisode episode, QueueType queueType)
{
//var foundItem = _downloadQueue.Select(x => (x.QueueDataObject == episode) && (x.ItemType == queueType)).First();
QueueItem foundItem = null;
if (_downloadQueue.Count > 0)
{
var foundItems = _downloadQueue.Where(x => (((RssEpisode)x.QueueDataObject).Id == episode.Id) && (x.ItemType == queueType)).ToList();
if (foundItems.Count() > 0)
{
foundItem = foundItems[0];
}
}
return(foundItem);
}
public static List <RssEpisode> CreateRssEpisodeForFeedItem(int feedItemId)
{
var episodeList = new List <RssEpisode>();
for (var i = 0; i < 10; i++)
{
var episode = new RssEpisode();
episode.Title = "Episode " + i.ToString();
episode.IsDownloaded = IsDownloadedEnum.NotDownloaded;
episode.Author = "Isaac Asimov";
episode.Description = "Description " + i.ToString();
episode.FeedItemId = feedItemId;
episodeList.Add(episode);
}
return(episodeList);
}
//************************************** Download Functions ******************************************
public async Task <bool> DownloadPodcast(RssEpisode episode)
{ //no need to be async, check some things then fire MessageCenter to background task
var result = false;
try
{
if (CanDownloadPodcast(episode))
{
var foundItem = FetchQueueItem(episode, QueueType.PodcastFile);
if (foundItem == null)
{
episode.PlayPauseDownloadIcon = IconFont.CircleArrowHistory;
//save download status to the database
var resultSave = await DataStore.SaveEpisodeItemAsync(episode, true); //returns the number of items changed
if (resultSave != 1)
{
Debug.WriteLine("DownloadService.DownloadPodcastAsync Could not Update episode");
}
//queue download
var queueItem = new QueueItem();
queueItem.ID = _downloadQueue.Count;
queueItem.ItemType = QueueType.PodcastFile;
queueItem.QueueDataObject = episode;
_downloadQueue.Enqueue(queueItem);
//start downloader
await StartDownloadAsync();
result = true;
}
else
{
Debug.WriteLine("DownloadService.DownloadPodcast episode was found in the _downloadQueue already");
}
}
else
{
Debug.WriteLine("DownloadService.DownloadPodcast CanDownload(episode) was false");
}
}
catch (Exception ex)
{
//could not delete item
Debug.WriteLine("DownloadService.DownloadPodcast Could not Download Podcast File " + ex.Message);
}
return(result);
}
private void UpdateEpisodeInItemsList(RssEpisode newEpisode)
{
RssEpisode foundEpisode = null;
int index = 0;
foreach (var e in Items)
{ //find the episode that finished
if (e.Id == newEpisode.Id)
{
foundEpisode = e;
break;
}
index++;
}
if (foundEpisode != null) //update the one episode
{
Items[index] = newEpisode;
}
}
public static bool CanDownloadImage(RssEpisode episode)
{
var result = false;
try
{
var filePath = FileHelper.GetImagePath(episode.ImageFileName);
var fileExists = File.Exists(filePath);
if (!fileExists)
{
result = true;
}
}
catch (Exception ex)
{
Debug.WriteLine("DownloadService.CanDownloadImage failed " + ex.Message);
}
return(result);
}
public async Task ExecutePlayCommandAsync(RssEpisode episode)
{
IsBusy = true;
try
{
var updatedEpisode = await RssEpisodeManager.PlayEpisodeAsync(episode);
UpdateEpisodeInItemsList(updatedEpisode); //do this at the end to avoid CollectionView refreshing
}
catch (Exception ex)
{
//could not delete item
Debug.WriteLine("RssEpisodeListViewModel.ExecutePlayCommandAsync Could not Play Podcast File " + ex.Message);
}
finally
{
IsBusy = false;
}
}
//this is not setup correctly yet
private void DownloadFeedFile(RssEpisode episode)
{
try
{
//download the file to storage
var filePath = FileHelper.GetImagePath(episode.ImageLink);
var message = new DownloadMessage
{
Id = episode.Id.Value, //needed to update RssEpisode when done
Url = episode.ImageLink,
FilePath = filePath,
QueueType = QueueType.RssFeed
};
MessagingCenter.Send(message, "Download"); //goes to Android project Service, returns thru DownloadFinishedMessage
}
catch (Exception ex)
{
Debug.WriteLine("DownloadService.DownloadFeedFile Error " + ex.Message);
}
}
public async Task ExecutePauseCommandAsync(RssEpisode episode)
{
IsBusy = true;
try
{
var updatedEpisode = await RssEpisodeManager.PauseEpisodeAsync(episode);
UpdateEpisodeItem(updatedEpisode); //do this at the end to avoid CollectionView refreshing
SliderMaximum = (int)PodcastPlayer.Instance.Duration;
}
catch (Exception ex)
{
//could not delete item
Debug.WriteLine("RssEpisodeDetailViewModel.ExecutePauseCommandAsync Could not Pause Podcast File " + ex.Message);
}
finally
{
IsBusy = false;
}
}
public static bool CanDownloadFeed(RssEpisode episode)
{
var result = false;
/*try
* {
* if (episode.Id != null)
* {
* var filePath = FileHelper.GetImagePath(episode.ImageFileName);
* var fileExists = File.Exists(filePath);
* if (!fileExists)
* result = true;
* }
* }
* catch (Exception ex)
* {
* Debug.WriteLine("DownloadService.CanDownloadFeed failed " + ex.Message);
* }*/
result = true;
return(result);
}
public async Task <bool> DownloadFeed(RssEpisode episode)
{ //no need to be async, check some things then fire MessageCenter to background task
var result = false;
try
{
if (CanDownloadFeed(episode))
{
if (!string.IsNullOrEmpty(episode.ImageFileName))
{
//queue download
var queueItem = new QueueItem();
queueItem.ID = _downloadQueue.Count;
queueItem.ItemType = QueueType.RssFeed;
queueItem.QueueDataObject = episode;
_downloadQueue.Enqueue(queueItem);
//start downloader
await StartDownloadAsync();
result = true;
}
else
{
Debug.WriteLine("DownloadService.DownloadFeed episode == Downloaded");
}
}
else
{
Debug.WriteLine("DownloadService.DownloadFeed CanDownload(episode) was false");
}
}
catch (Exception ex)
{
//could not download item
Debug.WriteLine("DownloadService.DownloadFeed Could not Download Podcast File " + ex.Message);
}
return(result);
}
private void UpdateEpisodeItem(RssEpisode newEpisode)
{
EpisodeItem = newEpisode;
}
public RssEpisodeDetailViewModel(FeedItem feedItem = null, RssEpisode episodeItem = null)
{
Title = feedItem?.Text;
FeedItem = feedItem;
EpisodeItem = episodeItem;
DownloadCommand = new Command(async() => await ExecuteDeleteCommand()); //Page actually uses the _Clicks
DeleteCommand = new Command(async() => await ExecuteDeleteCommand());
//if player is already playing
if (PodcastPlayer.Instance.IsPlaying)
{
PlayPauseIcon = IconFont.Pause;
if ((int)EpisodeItem.Duration > 0)
{
SliderMaximum = (int)PodcastPlayer.Instance.Duration;
}
Device.StartTimer(TimeSpan.FromSeconds(0.7), UpdatePosition);
}
else
{
if (EpisodeItem.IsDownloaded == IsDownloadedEnum.Downloaded && !string.IsNullOrEmpty(EpisodeItem.EnclosureLink))
{
PodcastPlayer.Instance.Episode = EpisodeItem;
if ((int)EpisodeItem.Duration > 0)
{
SliderMaximum = (int)EpisodeItem.Duration;
}
}
}
MessagingCenter.Subscribe <UpdateEpisodeMessage>(this, "UpdateEpisodeMessage", message => {
Device.BeginInvokeOnMainThread(() =>
{ //receive the result from DownloadService
if (EpisodeItem.Id == message.RssEpisode.Id)
{ //check that this ViewModel is the correct one for the downloaded podcast
DownloadButtonEnabled = true;
EpisodeItem = message.RssEpisode;
}
});
});
MessagingCenter.Subscribe <UpdateEpisodeMessage>(this, "StartEpisodePlaying", message => {
Device.BeginInvokeOnMainThread(() =>
{ //receive the result from DownloadService
if (EpisodeItem.Id == message.RssEpisode.Id)
{ //check that this ViewModel is the correct one for the downloaded podcast
PlayPauseState = true;
PlayPauseIcon = IconFont.Pause;
EpisodeItem = message.RssEpisode;
}
});
});
MessagingCenter.Subscribe <UpdateEpisodeMessage>(this, "StopEpisodePlaying", message => {
Device.BeginInvokeOnMainThread(() =>
{ //receive the result from DownloadService
if (EpisodeItem.Id == message.RssEpisode.Id)
{ //check that this ViewModel is the correct one for the downloaded podcast
PlayPauseState = false;
PlayPauseIcon = IconFont.PlayArrow;
EpisodeItem = message.RssEpisode;
}
});
});
MessagingCenter.Subscribe <UpdateEpisodeMessage>(this, "PlaybackEnded", message => {
Device.BeginInvokeOnMainThread(async() =>
{ //receive the result from DownloadService
if (EpisodeItem.Id == message.RssEpisode.Id)
{ //check that this ViewModel is the correct one for the downloaded podcast
await RssEpisodeManager.FinishedEpisodeAsync(message.RssEpisode);
PlayPauseState = false;
PlayPauseIcon = IconFont.PlayArrow;
EpisodeItem = message.RssEpisode;
}
});
});
}
