ersatztv/ErsatzTV/Pages/Settings/ScannerSettings.razor

@page "/settings/scanner"
@using ErsatzTV.Application.Configuration
@implements IDisposable
@inject IMediator Mediator
@inject ISnackbar Snackbar
@inject ILogger<ScannerSettings> Logger

<MudForm @ref="_form" @bind-IsValid="@_scannerSuccess" 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" OnClick="@(_ => SaveScannerSettings())" Class="ml-6" StartIcon="@Icons.Material.Filled.Save">Save Settings</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">Scanner</MudText>
            <MudDivider Class="mb-6"/>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Library Refresh Interval</MudText>
                </div>
                <MudTextField @bind-Value="_libraryRefreshInterval" Validation="@(new Func<int, string>(ValidateLibraryRefreshInterval))" Required="true" RequiredError="Library refresh interval is required!" Adornment="Adornment.End" AdornmentText="hours"/>
            </MudStack>
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

    private MudForm _form;
    private bool _scannerSuccess;
    private int _libraryRefreshInterval;

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

    protected override async Task OnParametersSetAsync()
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();
        var token = _cts.Token;

        try
        {
            _libraryRefreshInterval = await Mediator.Send(new GetLibraryRefreshInterval(), token);
            _scannerSuccess = _libraryRefreshInterval is >= 0 and < 1_000_000;
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private static string ValidateLibraryRefreshInterval(int libraryRefreshInterval) => libraryRefreshInterval switch
    {
        <= -1 => "Library refresh interval must be 0 (do not refresh) or greater than zero",
        >= 1_000_000 => "Library refresh interval must be less than 1,000,000. Use 0 to disable automatic refresh",
        _ => null
    };

    private async Task SaveScannerSettings()
    {
        await _form.Validate();
        if (_scannerSuccess)
        {
            Either<BaseError, Unit> result = await Mediator.Send(new UpdateLibraryRefreshInterval(_libraryRefreshInterval), _cts.Token);
            result.Match(
                Left: error =>
                {
                    Snackbar.Add(error.Value, Severity.Error);
                    Logger.LogError("Unexpected error saving scanner settings: {Error}", error.Value);
                },
                Right: _ => Snackbar.Add("Successfully saved scanner settings", Severity.Success));
        }
    }

}