Restore playback countdown display

Tornado3_2026Election/Controls/ChannelSchedulePanel.xaml

@@ -46,6 +46,61 @@
                 </StackPanel>
             </Grid>
 
+            <Border
+                Padding="14,12"
+                Background="#251A0B"
+                BorderBrush="{StaticResource ControlRoomSignalAmberBrush}"
+                BorderThickness="2"
+                CornerRadius="18"
+                Visibility="{x:Bind ViewModel.PlaybackCountdownVisibility, Mode=OneWay}">
+                <Grid ColumnSpacing="14">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="Auto" />
+                        <ColumnDefinition Width="*" />
+                    </Grid.ColumnDefinitions>
+
+                    <Border
+                        Width="54"
+                        Height="54"
+                        Background="#33FFB81C"
+                        BorderBrush="{StaticResource ControlRoomSignalAmberBrush}"
+                        BorderThickness="1"
+                        CornerRadius="27">
+                        <SymbolIcon
+                            Foreground="{StaticResource ControlRoomSignalAmberBrush}"
+                            Symbol="Clock"
+                            HorizontalAlignment="Center"
+                            VerticalAlignment="Center" />
+                    </Border>
+
+                    <StackPanel Grid.Column="1" Spacing="6">
+                        <Grid ColumnSpacing="12">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="Auto" />
+                                <ColumnDefinition Width="*" />
+                            </Grid.ColumnDefinitions>
+
+                            <TextBlock
+                                FontFamily="Consolas"
+                                FontSize="30"
+                                Foreground="{StaticResource ControlRoomTextPrimaryBrush}"
+                                Text="{x:Bind ViewModel.PlaybackCountdownText, Mode=OneWay}" />
+                            <TextBlock
+                                Grid.Column="1"
+                                VerticalAlignment="Center"
+                                Style="{StaticResource ConsoleBodyTextStyle}"
+                                Text="{x:Bind ViewModel.PlaybackCountdownDetail, Mode=OneWay}"
+                                TextTrimming="CharacterEllipsis" />
+                        </Grid>
+                        <ProgressBar
+                            Height="8"
+                            Maximum="100"
+                            Minimum="0"
+                            Value="{x:Bind ViewModel.PlaybackCountdownProgress, Mode=OneWay}" />
+                    </StackPanel>
+                </Grid>
+            </Border>
+
             <Grid ColumnSpacing="12">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="1.25*" />

Tornado3_2026Election/Domain/ChannelScheduleItem.cs

@@ -29,6 +29,8 @@ public sealed class ChannelScheduleItem : ObservableObject
     private ImageSource? _internalNextPreviewSource;
     private string _internalNextPreviewStatusLabel = string.Empty;
     private string _internalNextPreviewDisplayName = string.Empty;
+    private double _playbackRemainingSeconds;
+    private double _playbackTotalSeconds;
 
     public Guid Id { get; set; } = Guid.NewGuid();
 
@@ -105,6 +107,7 @@ public sealed class ChannelScheduleItem : ObservableObject
                 OnPropertyChanged(nameof(StateBadgeBackgroundBrush));
                 OnPropertyChanged(nameof(CardOpacity));
                 OnPropertyChanged(nameof(CanDelete));
+                OnPropertyChanged(nameof(PlaybackCountdownVisibility));
                 OnIssueStateChanged();
             }
         }
@@ -307,6 +310,27 @@ public sealed class ChannelScheduleItem : ObservableObject
             ? "실데이터 프리뷰 준비 중"
             : _renderedPreviewStatusLabel;
 
+    [JsonIgnore]
+    public bool HasPlaybackCountdown => State == ScheduleQueueItemState.OnAir && _playbackTotalSeconds > 0;
+
+    [JsonIgnore]
+    public Visibility PlaybackCountdownVisibility => HasPlaybackCountdown ? Visibility.Visible : Visibility.Collapsed;
+
+    [JsonIgnore]
+    public string PlaybackCountdownText => HasPlaybackCountdown
+        ? $"다음 컷까지 {Math.Max(0, (int)Math.Ceiling(_playbackRemainingSeconds))}초"
+        : "대기 중";
+
+    [JsonIgnore]
+    public string PlaybackCountdownDetail => HasPlaybackCountdown
+        ? $"{FormatName} / {DisplayRegionLabel}"
+        : string.Empty;
+
+    [JsonIgnore]
+    public double PlaybackCountdownProgress => HasPlaybackCountdown
+        ? Math.Clamp((_playbackRemainingSeconds / _playbackTotalSeconds) * 100d, 0d, 100d)
+        : 0d;
+
     [JsonIgnore]
     public ImageSource? InternalNextPreviewSource => _internalNextPreviewSource;
 
@@ -403,6 +427,33 @@ public sealed class ChannelScheduleItem : ObservableObject
         OnInternalNextPreviewChanged();
     }
 
+    public void UpdatePlaybackCountdown(TimeSpan remaining, TimeSpan total)
+    {
+        var normalizedTotal = Math.Max(0, total.TotalSeconds);
+        var normalizedRemaining = Math.Clamp(remaining.TotalSeconds, 0, normalizedTotal);
+        if (Math.Abs(_playbackRemainingSeconds - normalizedRemaining) < 0.001d &&
+            Math.Abs(_playbackTotalSeconds - normalizedTotal) < 0.001d)
+        {
+            return;
+        }
+
+        _playbackRemainingSeconds = normalizedRemaining;
+        _playbackTotalSeconds = normalizedTotal;
+        OnPlaybackCountdownChanged();
+    }
+
+    public void ClearPlaybackCountdown()
+    {
+        if (_playbackRemainingSeconds <= 0 && _playbackTotalSeconds <= 0)
+        {
+            return;
+        }
+
+        _playbackRemainingSeconds = 0;
+        _playbackTotalSeconds = 0;
+        OnPlaybackCountdownChanged();
+    }
+
     public void UpdateThumbnailLayout(ThumbnailDisplayMetrics metrics)
     {
         ThumbnailWidth = metrics.Width;
@@ -453,6 +504,15 @@ public sealed class ChannelScheduleItem : ObservableObject
         OnPropertyChanged(nameof(InternalNextPreviewDisplayName));
     }
 
+    private void OnPlaybackCountdownChanged()
+    {
+        OnPropertyChanged(nameof(HasPlaybackCountdown));
+        OnPropertyChanged(nameof(PlaybackCountdownVisibility));
+        OnPropertyChanged(nameof(PlaybackCountdownText));
+        OnPropertyChanged(nameof(PlaybackCountdownDetail));
+        OnPropertyChanged(nameof(PlaybackCountdownProgress));
+    }
+
     public static ChannelScheduleItem FromTemplate(FormatTemplateDefinition template, ScheduleRegionOption? regionOption = null)
     {
         var selectedRegion = regionOption ?? new ScheduleRegionOption

Tornado3_2026Election/Services/ChannelScheduleEngine.cs

@@ -130,6 +130,7 @@ public sealed class ChannelScheduleEngine
             item.CurrentRegionLabel = string.Empty;
             item.ClearRenderedPreview();
             item.ClearInternalNextPreview();
+            item.ClearPlaybackCountdown();
         }
 
         _lastPlaybackItemId = null;
@@ -203,6 +204,7 @@ public sealed class ChannelScheduleEngine
 
             item.State = ScheduleQueueItemState.Queued;
             item.CurrentRegionLabel = string.Empty;
+            item.ClearPlaybackCountdown();
             throw;
         }
         finally
@@ -221,6 +223,7 @@ public sealed class ChannelScheduleEngine
             _directPlaybackItem.CurrentRegionLabel = string.Empty;
             _directPlaybackItem.ClearRenderedPreview();
             _directPlaybackItem.ClearInternalNextPreview();
+            _directPlaybackItem.ClearPlaybackCountdown();
             _directPlaybackItem = null;
         }
 
@@ -244,6 +247,7 @@ public sealed class ChannelScheduleEngine
         {
             item.State = ScheduleQueueItemState.Queued;
             item.CurrentRegionLabel = string.Empty;
+            item.ClearPlaybackCountdown();
         }
         finally
         {
@@ -264,6 +268,7 @@ public sealed class ChannelScheduleEngine
             item.CurrentRegionLabel = string.Empty;
             item.ClearRenderedPreview();
             item.ClearInternalNextPreview();
+            item.ClearPlaybackCountdown();
         }
 
         RefreshQueueMarkers();
@@ -281,6 +286,7 @@ public sealed class ChannelScheduleEngine
         item.CurrentRegionLabel = string.Empty;
         item.ClearRenderedPreview();
         item.ClearInternalNextPreview();
+        item.ClearPlaybackCountdown();
         RefreshQueueMarkers();
         QueueChanged?.Invoke(this, EventArgs.Empty);
         return true;
@@ -312,6 +318,7 @@ public sealed class ChannelScheduleEngine
             activeItem.LastError = string.Empty;
             activeItem.CurrentRegionLabel = string.Empty;
             activeItem.ClearInternalNextPreview();
+            activeItem.ClearPlaybackCountdown();
         }
 
         RefreshQueueMarkers();
@@ -449,6 +456,7 @@ public sealed class ChannelScheduleEngine
                 sendingItem.LastError = ex.Message;
                 sendingItem.CurrentRegionLabel = string.Empty;
                 sendingItem.ClearInternalNextPreview();
+                sendingItem.ClearPlaybackCountdown();
                 ClearSkipCurrentItem(sendingItem);
             }
 
@@ -628,6 +636,7 @@ public sealed class ChannelScheduleEngine
 
             queueItem.CurrentRegionLabel = string.Empty;
             queueItem.ClearInternalNextPreview();
+            queueItem.ClearPlaybackCountdown();
             _lastPlaybackItemId = queueItem.Id;
             if (playedAny)
             {
@@ -727,6 +736,7 @@ public sealed class ChannelScheduleEngine
 
         queueItem.CurrentRegionLabel = string.Empty;
         queueItem.ClearInternalNextPreview();
+        queueItem.ClearPlaybackCountdown();
         _lastPlaybackItemId = queueItem.Id;
         if (playedAny)
         {
@@ -758,6 +768,7 @@ public sealed class ChannelScheduleEngine
         CancellationToken cancellationToken)
     {
         queueItem.State = ScheduleQueueItemState.Sending;
+        queueItem.ClearPlaybackCountdown();
         RefreshQueueMarkers();
         QueueChanged?.Invoke(this, EventArgs.Empty);
 
@@ -780,8 +791,11 @@ public sealed class ChannelScheduleEngine
         await _adapter.TakeAsync(Channel, cancellationToken).ConfigureAwait(false);
 
         var onAirAt = DateTimeOffset.Now;
+        var durationSeconds = ScheduleTemplatePolicy.NormalizeCutDurationSeconds(cut.DurationSeconds, template);
+        var playbackDuration = TimeSpan.FromSeconds(durationSeconds);
         queueItem.State = ScheduleQueueItemState.OnAir;
         queueItem.LastPlayedAt = onAirAt;
+        queueItem.UpdatePlaybackCountdown(playbackDuration, playbackDuration);
         RefreshQueueMarkers();
         QueueChanged?.Invoke(this, EventArgs.Empty);
 
@@ -792,8 +806,6 @@ public sealed class ChannelScheduleEngine
             signal.TrySetResult(true);
         }
 
-        var durationSeconds = ScheduleTemplatePolicy.NormalizeCutDurationSeconds(cut.DurationSeconds, template);
-        var playbackDuration = TimeSpan.FromSeconds(durationSeconds);
         await CaptureCurrentPreviewAsync(queueItem, template, cancellationToken).ConfigureAwait(false);
         QueueChanged?.Invoke(this, EventArgs.Empty);
         if (!ShouldSkipCurrentItem(queueItem))
@@ -829,17 +841,51 @@ public sealed class ChannelScheduleEngine
 
         if (ShouldSkipCurrentItem(queueItem))
         {
+            queueItem.ClearPlaybackCountdown();
             return;
         }
 
         var remainingDuration = playbackDuration - (DateTimeOffset.Now - onAirAt);
         if (remainingDuration <= TimeSpan.Zero)
         {
+            queueItem.ClearPlaybackCountdown();
             return;
         }
 
-        var delayTask = Task.Delay(remainingDuration, cancellationToken);
+        await WaitForPlaybackCountdownAsync(queueItem, onAirAt, playbackDuration, signal, cancellationToken)
-        await Task.WhenAny(delayTask, signal.Task).ConfigureAwait(false);
+            .ConfigureAwait(false);
+    }
+
+    private static async Task WaitForPlaybackCountdownAsync(
+        ChannelScheduleItem queueItem,
+        DateTimeOffset onAirAt,
+        TimeSpan playbackDuration,
+        TaskCompletionSource<bool> advanceSignal,
+        CancellationToken cancellationToken)
+    {
+        while (!cancellationToken.IsCancellationRequested)
+        {
+            var remaining = playbackDuration - (DateTimeOffset.Now - onAirAt);
+            if (remaining <= TimeSpan.Zero)
+            {
+                queueItem.ClearPlaybackCountdown();
+                return;
+            }
+
+            queueItem.UpdatePlaybackCountdown(remaining, playbackDuration);
+            var updateInterval = remaining > TimeSpan.FromSeconds(1)
+                ? TimeSpan.FromSeconds(1)
+                : remaining;
+            var delayTask = Task.Delay(updateInterval, cancellationToken);
+            var completedTask = await Task.WhenAny(delayTask, advanceSignal.Task).ConfigureAwait(false);
+            if (completedTask == advanceSignal.Task)
+            {
+                queueItem.ClearPlaybackCountdown();
+                return;
+            }
+        }
+
+        queueItem.ClearPlaybackCountdown();
     }
 
     private async Task CaptureCurrentPreviewAsync(
@@ -1215,6 +1261,7 @@ public sealed class ChannelScheduleEngine
         preparedFrame.Item.CurrentRegionLabel = string.Empty;
         preparedFrame.Item.ClearRenderedPreview();
         preparedFrame.Item.ClearInternalNextPreview();
+        preparedFrame.Item.ClearPlaybackCountdown();
     }
 
     private void ClearSkipCurrentItem(ChannelScheduleItem queueItem)
@@ -1732,6 +1779,7 @@ public sealed class ChannelScheduleEngine
             item.CurrentRegionLabel = string.Empty;
             item.ClearRenderedPreview();
             item.ClearInternalNextPreview();
+            item.ClearPlaybackCountdown();
         }
     }
 
@@ -1742,6 +1790,7 @@ public sealed class ChannelScheduleEngine
         queueItem.CurrentRegionLabel = string.Empty;
         queueItem.ClearRenderedPreview();
         queueItem.ClearInternalNextPreview();
+        queueItem.ClearPlaybackCountdown();
     }
 
     private static string NormalizeDataUnavailableReason(string reason)

Tornado3_2026Election/ViewModels/ChannelScheduleViewModel.cs

@@ -372,6 +372,15 @@ public sealed class ChannelScheduleViewModel : ObservableObject
         ?? QueueNextPlaybackItem?.PreviewStatusLabel
         ?? "다음 컷 없음";
 
+    public Visibility PlaybackCountdownVisibility =>
+        CurrentPlaybackItem?.PlaybackCountdownVisibility ?? Visibility.Collapsed;
+
+    public string PlaybackCountdownText => CurrentPlaybackItem?.PlaybackCountdownText ?? "대기 중";
+
+    public string PlaybackCountdownDetail => CurrentPlaybackItem?.PlaybackCountdownDetail ?? string.Empty;
+
+    public double PlaybackCountdownProgress => CurrentPlaybackItem?.PlaybackCountdownProgress ?? 0d;
+
     public double CurrentPreviewWidth => ResolvePlaybackPreviewMetrics(CurrentPlaybackItem).Width;
 
     public double CurrentPreviewHeight => ResolvePlaybackPreviewMetrics(CurrentPlaybackItem).Height;
@@ -892,6 +901,10 @@ public sealed class ChannelScheduleViewModel : ObservableObject
             nameof(NextPreviewSource),
             nameof(CurrentPreviewStatusLabel),
             nameof(NextPreviewStatusLabel),
+            nameof(PlaybackCountdownVisibility),
+            nameof(PlaybackCountdownText),
+            nameof(PlaybackCountdownDetail),
+            nameof(PlaybackCountdownProgress),
             nameof(CurrentPreviewWidth),
             nameof(CurrentPreviewHeight),
             nameof(NextPreviewWidth),
@@ -1155,6 +1168,10 @@ public sealed class ChannelScheduleViewModel : ObservableObject
             or nameof(ChannelScheduleItem.HasInternalNextPreview)
             or nameof(ChannelScheduleItem.LastError)
             or nameof(ChannelScheduleItem.LastIssueAt)
+            or nameof(ChannelScheduleItem.PlaybackCountdownVisibility)
+            or nameof(ChannelScheduleItem.PlaybackCountdownText)
+            or nameof(ChannelScheduleItem.PlaybackCountdownDetail)
+            or nameof(ChannelScheduleItem.PlaybackCountdownProgress)
             or nameof(ChannelScheduleItem.ThumbnailSource))
         {
             if (e.PropertyName is nameof(ChannelScheduleItem.State)
@@ -1182,6 +1199,10 @@ public sealed class ChannelScheduleViewModel : ObservableObject
             nameof(QueuedItemCount),
             nameof(QueueFootnote),
             nameof(QueueSummary),
+            nameof(PlaybackCountdownVisibility),
+            nameof(PlaybackCountdownText),
+            nameof(PlaybackCountdownDetail),
+            nameof(PlaybackCountdownProgress),
             nameof(ScheduleDataIssueVisibility),
             nameof(ScheduleDataIssueBackgroundBrush),
             nameof(ScheduleDataIssueBorderBrush),
@@ -1198,6 +1219,10 @@ public sealed class ChannelScheduleViewModel : ObservableObject
             nameof(NextPreviewSource),
             nameof(CurrentPreviewStatusLabel),
             nameof(NextPreviewStatusLabel),
+            nameof(PlaybackCountdownVisibility),
+            nameof(PlaybackCountdownText),
+            nameof(PlaybackCountdownDetail),
+            nameof(PlaybackCountdownProgress),
             nameof(CurrentPreviewWidth),
             nameof(CurrentPreviewHeight),
             nameof(NextPreviewWidth),