@using ErsatzTV.Application.MediaSources
@implements IDisposable
@inject IMediator Mediator
@inject NavigationManager NavigationManager
@inject ILogger<RemoteMediaSourceLibrariesEditor> Logger
@inject ISnackbar Snackbar
@inject IEntityLocker Locker

<MudForm Style="max-height: 100%">
    <MudPaper Square="true" Style="display: flex; height: 64px; min-height: 64px; width: 100%; z-index: 100; align-items: center">
        <MudButton Variant="Variant.Filled" Color="Color.Primary" Class="ml-6" StartIcon="@Icons.Material.Filled.Save" OnClick="@(_ => SaveChanges())">
            Save Changes
        </MudButton>
    </MudPaper>
    <div class="d-flex flex-column" style="height: 100vh; overflow-x: auto">
        <MudContainer MaxWidth="MaxWidth.ExtraLarge" Class="pt-8">
            <MudText Typo="Typo.h5" Class="mb-2"><b>@_source?.Name</b> Libraries</MudText>
            <MudDivider Class="mb-6"/>
            <MudTable Hover="true" Items="_libraries" Dense="true">
                <ColGroup>
                    <MudHidden Breakpoint="Breakpoint.Xs">
                        <col/>
                        <col/>
                        <col style="width: 100px;"/>
                    </MudHidden>
                </ColGroup>
                <HeaderContent>
                    <MudTh>
                        <MudTableSortLabel SortBy="new Func<RemoteMediaSourceLibraryEditViewModel, object>(x => x.Name)">
                            Name
                        </MudTableSortLabel>
                    </MudTh>
                    <MudTh>
                        <MudTableSortLabel SortBy="new Func<RemoteMediaSourceLibraryEditViewModel, object>(x => x.MediaKind)">
                            Media Kind
                        </MudTableSortLabel>
                    </MudTh>
                    <MudTh>Synchronize</MudTh>
                </HeaderContent>
                <RowTemplate>
                    <MudTd DataLabel="Name">@context.Name</MudTd>
                    <MudTd DataLabel="MediaType">@context.MediaKind</MudTd>
                    <MudTd DataLabel="Synchronize">
                        <MudSwitch T="bool" @bind-Value="@context.ShouldSyncItems" Color="Color.Primary"/>
                    </MudTd>
                </RowTemplate>
            </MudTable>
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

    [Parameter]
    public int Id { get; set; }

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

    [Parameter]
    public Func<int, CancellationToken, Task<Option<RemoteMediaSourceViewModel>>> GetMediaSourceById { get; set; }

    [Parameter]
    public Func<int, CancellationToken, Task<List<RemoteMediaSourceLibraryEditViewModel>>> GetLibrariesBySourceId { get; set; }

    [Parameter]
    public Func<List<RemoteMediaSourceLibraryEditViewModel>, IRequest<Either<BaseError, Unit>>> GetUpdateLibraryRequest { get; set; }

    [Parameter]
    public Func<SynchronizeParameters, CancellationToken, Task<Unit>> SynchronizeLibraryByIdIfNeeded { get; set; }

    private RemoteMediaSourceViewModel _source;
    private List<RemoteMediaSourceLibraryEditViewModel> _libraries;

    public record SynchronizeParameters(int LibraryId, int MediaSourceId);

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

    protected override Task OnParametersSetAsync() => LoadData();

    private async Task LoadData()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();
        var token = _cts.Token;

        try
        {
            Option<RemoteMediaSourceViewModel> maybeSource = await GetMediaSourceById(Id, token);
            foreach (var source in maybeSource)
            {
                _source = source;
                _libraries = await GetLibrariesBySourceId(Id, token);
            }

            if (maybeSource.IsNone)
            {
                NavigationManager.NavigateTo("404");
            }
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private async Task SaveChanges()
    {
        using var cts = new CancellationTokenSource();

        IRequest<Either<BaseError, Unit>> request = GetUpdateLibraryRequest(_libraries);
        Either<BaseError, Unit> result = await Mediator.Send(request, cts.Token);
        foreach (var error in result.LeftToSeq())
        {
            Snackbar.Add($"Unexpected error saving {Name.ToLowerInvariant()} libraries: {error.Value}", Severity.Error);
            Logger.LogError("Unexpected error saving {MediaSource} libraries: {Error}", Name, error.Value);
        }

        if (result.IsRight)
        {
            foreach (int libraryId in _libraries.Filter(l => l.ShouldSyncItems).Map(l => l.Id))
            {
                if (Locker.LockLibrary(libraryId))
                {
                    await SynchronizeLibraryByIdIfNeeded(new SynchronizeParameters(libraryId, Id), cts.Token);
                }
            }

            NavigationManager.NavigateTo($"media/sources/{Name.ToLowerInvariant()}");
        }
    }

}