/// <summary>
/// Persist User properties.
/// </summary>
public async Task PersistUser()
{
if (User == null)
{
return;
}
await _store.Insert(User);
await _store.Persist();
}
/// <summary>
/// Discover new matching friends from the backend.
/// </summary>
public async Task DiscoverFriendsAsync(List <LocalContact> contacts)
{
//Find unassociated contacts
var contactsFromFriends = Friends.Select(f => f.LocalContact);
var unassociatedContacts = contacts
.Except(contactsFromFriends, new ContactComparer(ContactComparer.CompareBy.PhoneNumber)).ToList();
var friends = await _friendsService
.FetchFriends(unassociatedContacts.Select(f => f.NormalizedPhoneNumber));
if (friends == null)
{
return;
}
foreach (var friend in friends)
{
if (Friends.Contains(friend, new FriendsComparer()))
{
continue;
}
friend.LocalContact = unassociatedContacts
.SingleOrDefault(c => c.NormalizedPhoneNumber == friend.PhoneNumber);
//Persist friend
await _keyValueStore.Insert(friend);
Friends.Add(friend);
//Persist chatbook
var chatbook = new ChatBook()
{
FriendKey = friend.Key
};
await _realmStore.AddAsync(chatbook);
OnPropertyChanged(nameof(Friends));
}
}
private async Task Persist()
{
await _store.Insert(this);
await _store.Persist();
}