deepdrft/DeepDrftPublic.Client/Pages/MixDetail.razor

@page "/mixes/{EntryKey}"
@using DeepDrftPublic.Client.Controls
@using DeepDrftPublic.Client.Services
@inherits ReleaseDetailBase
@inject SeoOptions Seo

@if (ViewModel.IsLoading)
{
    <div class="deepdrft-track-detail-container">
        <div class="deepdrft-track-detail-masthead">
            <MudSkeleton SkeletonType="SkeletonType.Text" Width="70%" Height="56px" />
            <MudSkeleton SkeletonType="SkeletonType.Text" Width="40%" Height="32px" />
        </div>
    </div>
}
else if (ViewModel.NotFound || ViewModel.Release is null)
{
    @* Soft-404: a bad key renders a 200 "not found" view, so it must carry noindex so it is not indexed
       (mirrors the dedicated /404 NotFound page). *@
    <SeoHead Model="@SeoModel.ForNotFound(Seo)" />
    <div class="deepdrft-track-detail-container">
        <div class="deepdrft-track-detail-masthead">
            <MudText Typo="Typo.h4" Align="Align.Center">Mix not found.</MudText>
            <div class="d-flex justify-center mt-4">
                <MudButton Href="/mixes"
                           Variant="Variant.Text"
                           StartIcon="@Icons.Material.Filled.ArrowBack">
                    All mixes
                </MudButton>
            </div>
        </div>
    </div>
}
else
{
    var release = ViewModel.Release;
    var mixTracks = ViewModel.Track is not null ? new[] { ViewModel.Track } : null;

    @* SEO head — fed from the same bridged release + single track, so prerender and WASM render identical
       tags (AC6). MusicRecording with ISO-8601 duration from the track (§3.4). *@
    <SeoHead Model="@SeoModel.ForRelease(Seo, release, mixTracks)" />

    @* Full-page waveform sits behind the scaffold content. The scaffold's container is positioned
       above it via the mix-detail-foreground stacking context. TrackId lets the visualizer couple to
       playback only when the player is on this mix's track; TrackEntryKey is the datum to render at rest
       (before playback) — the mix's single track, so the lava shows immediately on page load (§4). *@
    <WaveformVisualizer ReleaseEntryKey="@release.EntryKey"
                        TrackId="@ViewModel.Track?.Id"
                        TrackEntryKey="@ViewModel.Track?.EntryKey" />

    <div class="mix-detail-foreground dd-detail-fill">
      <MudContainer MaxWidth="MaxWidth.Large" Class="mix-detail-container">
        @* Mix keeps the scaffold solely for the Phase 10 top row (back link | controls | lava-lamp).
           Title/artist/genre/date/share/play all move into the overlaid hero, so the scaffold's
           default header and meta regions are suppressed (ShowHeader/ShowMeta=false) and the share
           row stays off (ShowShareRow=false). *@
        <ReleaseDetailScaffold Title="@release.Title"
                               Artist="@release.Artist"
                               Track="@ViewModel.Track"
                               BackHref="/mixes"
                               BackLabel="All mixes"
                               ShowHeader="false"
                               ShowMeta="false"
                               ShowShareRow="false">
            <TopRightAction>
                @* Theater toggle sits immediately LEFT of the lava-lamp popover (Phase 20 §3). Both stay
                   visible in Theater Mode — controls over the experience, not release content (§4/OQ4).
                   Wrapped so they cluster on the right rather than spreading across the SpaceBetween row. *@
                <div class="dd-detail-top-actions">
                    @* Theater toggle only appears when this Mix is the currently-playing release
                       (Phase 20 Wave 2 §3). ShowTheaterToggle folds in the subsystem + release-playing gate. *@
                    <TheaterModeToggle Available="ShowTheaterToggle" />
                    @* Lava-lamp icon → popover panel, top-right across from the back link (Phase 12
                       §3d-revised). Replaces the former inline TopContent knob-bar: the icon IS the toggle
                       and the popover IS the panel. Mix takes the cleanest anchor case (§8e) — the popover's
                       default bottom-right anchor opens down over the full-bleed field. *@
                    <WaveformVisualizerControlPopover />
                </div>
            </TopRightAction>
            <Hero>
                @* Theater Mode (Phase 20 §4, Wave 2 §2): the hero overlay stays mounted and eases out via
                   a collapsing wrapper so it does not pop — collapsed to zero height when Theater is on AND
                   this Mix is the playing release. OFF eases the full-bleed visualizer back behind the hero. *@
                <div class="dd-theater-collapsible @(IsContentHidden ? "dd-theater-collapsed" : null)">
                <div class="dd-theater-collapsible-inner">
                @* Cover-as-background hero with all metadata overlaid, square `mix-hero` sizing. The
                   cover art IS the background, so no separate cover thumbnail (CoverThumbKey defaults
                   to null). Share and play ride in as slots, matching Sessions. *@
                <ReleaseHeroOverlay Class="mix-hero"
                                    HeroImageKey="@release.ImagePath"
                                    PlaceholderIcon="@Icons.Material.Filled.Album"
                                    Title="@release.Title"
                                    Artist="@release.Artist"
                                    Genre="@release.Genre"
                                    ReleaseDate="@release.ReleaseDate">
                    <ShareContent>
                        @* Release-mode share: copies the canonical /mixes/{entryKey} URL, not a single track (§3b). *@
                        <SharePopover ReleaseEntryKey="@release.EntryKey" ReleaseMedium="@release.Medium" />
                    </ShareContent>
                    <PlayContent>
                        @if (ViewModel.Track is not null)
                        {
                            <PlayStateIcon Track="@ViewModel.Track" Size="Size.Large" Color="Color.Secondary" OnToggle="@PlayTrack" />
                            @* Append-only: queues the mix's single track without starting playback. *@
                            <AddToQueueButton Track="@ViewModel.Track" Size="Size.Large" />
                        }
                    </PlayContent>
                </ReleaseHeroOverlay>
                </div>
                </div>
            </Hero>
            <BodyContent>
                @* Theater Mode (Wave 2 §2): eased collapse, mirroring the Hero region. *@
                <div class="dd-theater-collapsible @(IsContentHidden ? "dd-theater-collapsed" : null)">
                    <div class="dd-theater-collapsible-inner">
                    @* Blurb sits below the hero, inside the scaffold's foreground stacking context. *@
                    <ReleaseDescription Description="@release.Description" />
                    </div>
                </div>
            </BodyContent>
        </ReleaseDetailScaffold>
      </MudContainer>
    </div>
}

@code {
    protected override string PersistKey => "mix-detail";

    // PlayerService is cascaded by ReleaseDetailBase (used there for the Theater release-playing predicate).
    [CascadingParameter] public IQueueService? Queue { get; set; }

    // The hero now carries the play affordance (the scaffold's header is suppressed), so the
    // play-toggle is wired here directly — mirroring SessionDetail. Toggle if this track is already
    // active, otherwise PLAY it: prepend to the queue's front (deque PLAY semantics) so it becomes
    // current and the existing queue stays intact behind it. Falls back to a direct stream when the
    // queue cascade is absent (prerender / non-interactive).
    private async Task PlayTrack()
    {
        var track = ViewModel.Track;
        if (track is null || PlayerService is null) return;

        var isThisTrack = PlayerService.CurrentTrack?.Id == track.Id;
        if (isThisTrack && (PlayerService.IsPlaying || PlayerService.IsPaused))
        {
            await PlayerService.TogglePlayPause();
        }
        else if (Queue is not null)
        {
            await Queue.PlayTrack(track);
        }
        else
        {
            await PlayerService.SelectTrackStreaming(track);
        }
    }
}