IEnumerable <Event> Sync_flashcards(SyncContextModel model)
{
var flashcards = _db.LoadFlashcards().ToArray();
var events0 = Sync_new_and_changed_flashcards(model, flashcards);
var events1 = Sync_deleted_flashcards(model, flashcards);
_db.StoreFlashcards(flashcards);
return(events0.Concat(events1));
}
private Event[] Sync_new_and_changed_flashcards(SyncContextModel model, FlashcardRecord[] flashcards)
{
return(flashcards.SelectMany(Sync_flashcard).ToArray());
IEnumerable <Event> Sync_flashcard(FlashcardRecord fc)
{
if (string.IsNullOrWhiteSpace(fc.Id))
{
// new card found; if it comes with a bin then keep it
var eImported = new NewCardEncountered {
Question = fc.Question, Answer = fc.Answer, Tags = fc.Tags
};
var eMoved = new CardMovedTo {
CardId = eImported.Id, BinIndex = 0
};
if (string.IsNullOrWhiteSpace(fc.BinIndex) is false)
{
eMoved.BinIndex = int.Parse(fc.BinIndex);
}
yield return(eImported);
yield return(eMoved);
fc.Id = eImported.Id;
fc.BinIndex = eMoved.BinIndex.ToString();
}
else
{
// changed card found
var fcHash = FlashcardHash.Calculate(fc.Question, fc.Answer, fc.Tags);
if (model.Flashcards[fc.Id].hash != fcHash)
{
yield return new CardWasChanged {
CardId = fc.Id, Question = fc.Question, Answer = fc.Answer, Tags = fc.Tags
}
}
;
}
// always update the binIndex in the flashcard record to be written back to the file
if (model.Flashcards.ContainsKey(fc.Id))
{
fc.BinIndex = model.Flashcards[fc.Id].binIndex;
}
}
}
private CardFoundMissing[] Sync_deleted_flashcards(SyncContextModel model, FlashcardRecord[] flashcards) => (from id in model.Flashcards.Keys