public TagsViewModel(IDataClient client, IDialogCoordinator dialogCoordinator)
{
_client = client;
_dialogCoordinator = dialogCoordinator;
Tags = new ObservableCollection <TagViewModel>();
//Load all tags from db
LoadTags = ReactiveCommand.CreateFromTask(async _ => await _client.GetTags().ConfigureAwait(true));
LoadTags.Subscribe(async result =>
{
if (!result.WasSuccessful)
{
await _dialogCoordinator.ShowMessageAsync(this, "Error", string.Join("\n", result.Errors)).ConfigureAwait(true);
return;
}
foreach (var tag in result.Result)
{
Tags.Add(new TagViewModel(tag));
}
});
//Add new tag
var addCanExecute = NewTag
.WhenAnyValue(x => x.Name)
.Select(newName => !string.IsNullOrEmpty(newName));
Add = ReactiveCommand.CreateFromTask(async _ =>
{
var tag = await client.AddTag(NewTag.Model).ConfigureAwait(true);
NewTag.Name = "";
return(tag);
},
addCanExecute);
Add.Subscribe(async result =>
{
if (!result.WasSuccessful)
{
await _dialogCoordinator.ShowMessageAsync(this, "Error", string.Join("\n", result.Errors)).ConfigureAwait(true);
return;
}
Tags.Add(new TagViewModel(result.Result));
});
//When changing the selected tag, reset the delete confirmation
this.WhenAnyValue(x => x.SelectedTag)
.Buffer(1, 1)
.Subscribe(x => { var tagVm = x.FirstOrDefault(); if (tagVm != null)
{
tagVm.ConfirmDelete = false;
}
});
//Delete Tag
Delete = ReactiveCommand.CreateFromTask(async _ =>
{
if (SelectedTag.ConfirmDelete != true)
{
SelectedTag.ConfirmDelete = true;
return(null);
}
return(await client.DeleteTag(SelectedTag?.Model).ConfigureAwait(true));
},
this.WhenAnyValue(x => x.SelectedTag).Select(x => x != null));
Delete.Subscribe(async result =>
{
if (result == null)
{
return;
}
if (await result.DisplayErrors(this, _dialogCoordinator))
{
return;
}
Tags.Remove(Tags.FirstOrDefault(x => x.Model.ID == result.Result.ID));
});
//Update Tag
var saveCanExecute = this
.WhenAnyValue(x => x.SelectedTag, x => x.SelectedTagHasErrors, (tag, hasError) => new { tag, hasError })
.Select(x => x.tag != null && x.hasError == false);
Save = ReactiveCommand.CreateFromTask(
async _ => await client.UpdateTag(SelectedTag?.Model).ConfigureAwait(true),
saveCanExecute);
Save.Subscribe(async result => await result.DisplayErrors(this, _dialogCoordinator));
}