ErsatzTV/ErsatzTV/Pages/Settings/HDHRSettings.razor

@page "/settings/hdhr"
@using ErsatzTV.Annotations
@using ErsatzTV.Application.HDHR
@implements IDisposable
@inject IMediator Mediator
@inject ISnackbar Snackbar
@inject ILogger<HDHRSettings> Logger

<MudForm @ref="_form" @bind-IsValid="@_hdhrSuccess" 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="@(_ => SaveHDHRSettings())" 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">HDHomeRun</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>UUID</MudText>
                </div>
                <MudTextField @bind-Value="_uuid" Disabled="true"/>
            </MudStack>
            <MudStack Row="true" Breakpoint="Breakpoint.SmAndDown" Class="form-field-stack gap-md-8 mb-5">
                <div class="d-flex">
                    <MudText>Tuner Count</MudText>
                </div>
                <MudTextField @bind-Value="_tunerCount" Validation="@(new Func<int, string>(ValidateTunerCount))" Required="true" RequiredError="Tuner count is required!"/>
            </MudStack>
        </MudContainer>
    </div>
</MudForm>

@code {
    private CancellationTokenSource _cts;

    private MudForm _form;
    private bool _hdhrSuccess;
    private int _tunerCount;

    [UsedImplicitly]
    private Guid _uuid;

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

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

        try
        {
            _tunerCount = await Mediator.Send(new GetHDHRTunerCount(), token);
            _uuid = await Mediator.Send(new GetHDHRUUID(), token);
            _hdhrSuccess = string.IsNullOrWhiteSpace(ValidateTunerCount(_tunerCount));
        }
        catch (OperationCanceledException)
        {
            // do nothing
        }
    }

    private static string ValidateTunerCount(int tunerCount) => tunerCount <= 0 ? "Tuner count must be greater than zero" : null;

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

}