public async Task <IEnumerable <SnapshotMiniature> > GetSnapshotMiniaturesAsync(IEnumerable <LocationSnapshot> snapshots)
{
var results = new List <SnapshotMiniature>();
if (!snapshots.Any())
{
return(results);
}
var miniatures = _miniaturesCache.GetSnapshotMiniatures(snapshots);
if (miniatures.Count() == snapshots.Count())
{
return(miniatures);
}
var pictureFiles = await GetPictureFiles();
foreach (var snapshot in snapshots)
{
var pictureFile = pictureFiles.FirstOrDefault(_ => _.Name == snapshot.PictureFileName);
var miniature = (pictureFile != null) ? await GetSnapshotMiniatureAsync(snapshot, pictureFile) : new SnapshotMiniature
{
Snapshot = snapshot
};
results.Add(miniature);
if (miniature.Data == null)
{
continue;
}
_miniaturesCache.AddSnapshotMiniature(miniature);
}
return(results);
}
public async Task <IEnumerable <SnapshotMiniature> > GetSnapshotMiniaturesAsync(IEnumerable <LocationSnapshot> snapshots)
{
if (!snapshots.Any())
{
return(new List <SnapshotMiniature>());
}
var miniatures = _miniaturesCache.GetSnapshotMiniatures(snapshots);
if (miniatures.Count() == snapshots.Count())
{
return(miniatures);
}
var picturesUrl = await GetPicturesUrl();
picturesUrl = $"{picturesUrl}?snapshotsIds={string.Join(",", snapshots.Select(_ => _.Id))}";
var result = await _webClient.GetAsync <IEnumerable <ExpandoObject> >(picturesUrl);
miniatures = result.Select(_ =>
{
var descriptor = (IDictionary <string, object>)_;
return(new
{
PictureFileName = descriptor["pictureFileName"].ToString(),
Thumbnail = descriptor["thumbnail"].ToString()
});
}).Join(snapshots, desc => desc.PictureFileName, snap => snap.PictureFileName, (desc, snap) =>
{
var miniature = new SnapshotMiniature
{
Snapshot = snap,
Data = Convert.FromBase64String(desc.Thumbnail)
};
_miniaturesCache.AddSnapshotMiniature(miniature);
return(miniature);
})
.ToList();
return(miniatures);
}