51 lines
1.7 KiB
C#
51 lines
1.7 KiB
C#
using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Extensions;
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using ErsatzTV.Core.Interfaces.Scheduling;
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namespace ErsatzTV.Core.Scheduling;
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public sealed class ChronologicalMediaCollectionEnumerator : IMediaCollectionEnumerator
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{
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private readonly Lazy<Option<TimeSpan>> _lazyMinimumDuration;
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private readonly IList<MediaItem> _sortedMediaItems;
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public ChronologicalMediaCollectionEnumerator(
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IEnumerable<MediaItem> mediaItems,
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CollectionEnumeratorState state)
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{
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CurrentIncludeInProgramGuide = Option<bool>.None;
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_sortedMediaItems = mediaItems.OrderBy(identity, new ChronologicalMediaComparer()).ToList();
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_lazyMinimumDuration = new Lazy<Option<TimeSpan>>(
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() => _sortedMediaItems.Bind(i => i.GetNonZeroDuration()).OrderBy(identity).HeadOrNone());
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State = new CollectionEnumeratorState { Seed = state.Seed };
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if (state.Index >= _sortedMediaItems.Count)
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{
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state.Index = 0;
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state.Seed = 0;
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}
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while (State.Index < state.Index)
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{
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MoveNext();
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}
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}
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public void ResetState(CollectionEnumeratorState state) =>
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// seed doesn't matter in chronological
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State.Index = state.Index;
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public CollectionEnumeratorState State { get; }
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public Option<MediaItem> Current => _sortedMediaItems.Any() ? _sortedMediaItems[State.Index] : None;
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public Option<bool> CurrentIncludeInProgramGuide { get; }
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public void MoveNext() => State.Index = (State.Index + 1) % _sortedMediaItems.Count;
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public Option<TimeSpan> MinimumDuration => _lazyMinimumDuration.Value;
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public int Count => _sortedMediaItems.Count;
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}
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