deepdrft/DeepDrftPublic.Client/Controls/Settings/StreamQualitySetting.razor

@using DeepDrftPublic.Client.Common
@using DeepDrftPublic.Client.Services

@*
    The streaming-quality control (Phase 18 wave 18.6, §4) — the first occupant of the Settings menu. Binds
    the listener's choice to PublicSiteSettings.StreamQuality and persists it via the cookie seam. Honest
    capability gate (OQ2 / AC7): on a browser that cannot decode Ogg Opus the Low-data option still selects,
    but a note tells the listener the effective stream is lossless — we never let the choice silently imply a
    format that can't play.
*@
<div class="dd-setting-control">
    <MudRadioGroup T="StreamQuality" Value="_quality" ValueChanged="OnQualityChanged">
        <MudRadio T="StreamQuality" Value="StreamQuality.LowData" Color="Color.Primary" Dense="true">
            Low-data (Opus)
        </MudRadio>
        <MudRadio T="StreamQuality" Value="StreamQuality.Lossless" Color="Color.Primary" Dense="true">
            Lossless (WAV)
        </MudRadio>
    </MudRadioGroup>

    @if (_opusUnavailable && _quality == StreamQuality.LowData)
    {
        <div class="dd-setting-note">
            This browser can't decode Opus — you'll stream lossless.
        </div>
    }
    <div class="d-flex flex-align-right">
        <MudButton Disabled="!IsApplyEnabled"
                   Color="Color.Primary"
                   Variant="Variant.Filled"
                   OnClick="@ApplyStreamQualitySetting">
            APPLY
        </MudButton>
    </div>
</div>

@code {
    [Inject] public required PublicSiteSettings Settings { get; set; }
    [Inject] public required SettingsCookieService CookieService { get; set; }
    [Inject] public required AudioInteropService AudioInterop { get; set; }

    // The active player, threaded in from SettingsMenu (which reads it off the AudioPlayerProvider cascade).
    // It is an explicit [Parameter], NOT a [CascadingParameter], because this control renders inside the
    // MudMenu panel, which MudBlazor portals to <MudPopoverProvider> — outside AudioPlayerProvider's cascade
    // scope, so a cascade would land null here. Null during prerender or when no provider is present — Apply
    // then just persists the preference, with no live track to restart.
    [Parameter] public IStreamingPlayerService? Player { get; set; }

    private StreamQuality _quality;

    public bool IsApplyEnabled => _quality != Settings.StreamQuality;
    
    // Null until the capability probe runs (post-render JS interop). false → can decode Opus; true → cannot.
    private bool _opusUnavailable;

    protected override void OnInitialized()
    {
        // Read the current preference (already seeded at prerender + bridged into WASM).
        _quality = Settings.StreamQuality;
    }

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (!firstRender) return;

        // Capability probe is JS interop — only valid once interactive. Surfaces the honest note when the
        // browser can't decode Ogg Opus, so a Low-data pick reads as "effectively lossless" rather than
        // silently failing. The player applies the same gate independently; this is purely the UI honesty.
        var canDecodeOpus = await AudioInterop.CanDecodeOggOpus();
        if (canDecodeOpus == _opusUnavailable)
        {
            _opusUnavailable = !canDecodeOpus;
            StateHasChanged();
        }
    }

    private async Task OnQualityChanged(StreamQuality quality)
    {
        _quality = quality;
    }

    private async Task ApplyStreamQualitySetting(MouseEventArgs arg)
    {
        // Persist the choice first so the cookie + in-memory PublicSiteSettings.StreamQuality both reflect
        // the new value BEFORE the restart: the reload re-resolves the delivery format via
        // PreferenceAwareStreamingPlayerService, which reads PublicSiteSettings.StreamQuality fresh.
        await CookieService.SetStreamQualityAsync(_quality);

        // Switch the currently-playing track to the new format immediately, preserving the listener's
        // position. No-op inside the player when nothing is loaded — the new preference then simply
        // applies to the next track played. Fire-and-forget: the reload runs the streaming loop for the
        // life of the track, so awaiting it would pin this handler open; UI updates flow through the
        // player's state notifications, not this await.
        _ = Player?.ReloadPreservingPositionAsync();
    }

}