ErsatzTV/ErsatzTV/Shared/SaveAsSmartCollectionDialog.razor

@using ErsatzTV.Application.MediaCollections
@using Microsoft.Extensions.Caching.Memory
@implements IDisposable
@inject IMediator Mediator
@inject IMemoryCache MemoryCache
@inject ISnackbar Snackbar
@inject ILogger<SaveAsSmartCollectionDialog> Logger

<MudDialog>
    <DialogContent>
        <EditForm Model="@_dummyModel" OnSubmit="@(_ => Submit())">
            <MudContainer Class="mb-6">
                <MudText Class="mud-primary-text"
                         Style="background-color: transparent; font-weight: bold">
                    Select the desired smart collection
                </MudText>
            </MudContainer>
            <MudSelect Label="Collection" @bind-Value="_selectedCollection" Class="mb-6 mx-4">
                @foreach (SmartCollectionViewModel collection in _collections)
                {
                    <MudSelectItem Value="@collection">@collection.Name</MudSelectItem>
                }
            </MudSelect>
            <MudTextField T="string" Label="New Collection Name"
                          Disabled="@(_selectedCollection != _newCollection)"
                          @bind-Text="@_newCollectionName"
                          Class="mb-6 mx-4">
            </MudTextField>
        </EditForm>
    </DialogContent>
    <DialogActions>
        <MudButton OnClick="Cancel" ButtonType="ButtonType.Reset">Cancel</MudButton>
        <MudButton Color="Color.Primary" Variant="Variant.Filled" OnClick="Submit">
            Save As Smart Collection
        </MudButton>
    </DialogActions>
</MudDialog>


@code {
    private readonly CancellationTokenSource _cts = new();

    [CascadingParameter]
    IMudDialogInstance MudDialog { get; set; }

    [Parameter]
    public string Query { get; set; }

    private readonly SmartCollectionViewModel _newCollection = new(-1, "(New Collection)", string.Empty);
    private string _newCollectionName;

    private List<SmartCollectionViewModel> _collections = new();

    private SmartCollectionViewModel _selectedCollection;

    private record DummyModel;

    private readonly DummyModel _dummyModel = new();

    public void Dispose()
    {
        _cts.Cancel();
        _cts.Dispose();
    }

    private bool CanSubmit() =>
        _selectedCollection != null && (_selectedCollection != _newCollection || !string.IsNullOrWhiteSpace(_newCollectionName));

    protected override async Task OnParametersSetAsync()
    {
        _collections = await Mediator.Send(new GetAllSmartCollections(), _cts.Token)
            .Map(list => new[] { _newCollection }.Append(list.OrderBy(vm => vm.Name, StringComparer.CurrentCultureIgnoreCase)).ToList());

        if (MemoryCache.TryGetValue("SaveAsSmartCollectionDialog.SelectedCollectionId", out int id))
        {
            _selectedCollection = _collections.SingleOrDefault(c => c.Id == id) ?? _newCollection;
        }
        else
        {
            _selectedCollection = _newCollection;
        }
    }

    private async Task Submit()
    {
        if (!CanSubmit())
        {
            return;
        }

        if (_selectedCollection == _newCollection)
        {
            Either<BaseError, SmartCollectionViewModel> maybeResult =
                await Mediator.Send(new CreateSmartCollection(Query, _newCollectionName), _cts.Token);

            maybeResult.Match(
                collection =>
                {
                    MemoryCache.Set("SaveAsSmartCollectionDialog.SelectedCollectionId", collection.Id);
                    MudDialog.Close(DialogResult.Ok(new Tuple<SmartCollectionViewModel, bool>(collection, false)));
                },
                error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Error creating new collection: {Error}", error.Value);
                    MudDialog.Close(DialogResult.Cancel());
                });
        }
        else
        {
            MemoryCache.Set("SaveAsSmartCollectionDialog.SelectedCollectionId", _selectedCollection.Id);
            MudDialog.Close(DialogResult.Ok(new Tuple<SmartCollectionViewModel, bool>(_selectedCollection, true)));
        }
    }

    private async Task Cancel(MouseEventArgs e)
    {
        // this is gross, but [enter] seems to sometimes trigger cancel instead of submit
        if (e.Detail == 0)
        {
            await Submit();
        }
        else
        {
            MudDialog.Cancel();
        }
    }

}