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apple/PhysarumApp/TopShelf/TopShelfProvider.swift

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import TVServices

/// Returns a single full-screen carousel hero (the hosted physarum loop) for the Top Shelf.
/// The previewVideoURL plays after the poster image transitions in. tvOS-only (TVServices).
///
/// API verified against the AppleTVOS SDK (TVServices framework headers): `TVTopShelfCarouselItem`
/// inherits `setImageURL(_:for:)`, `playAction`, and `displayAction` from `TVTopShelfItem`;
/// there is no `imageShape` on the carousel item (carousel images are HDTV-shaped by definition).
/// `ImageTraits` is an OptionSet — `[]` requests the default (un-scaled) variant.
final class TopShelfProvider: TVTopShelfContentProvider {
    override func loadTopShelfContent(completionHandler: @escaping (TVTopShelfContent?) -> Void) {
        let hero = TopShelfHero.shared
        let item = TVTopShelfCarouselItem(identifier: hero.identifier)
        item.setImageURL(hero.posterURL, for: [])
        item.previewVideoURL = hero.videoURL
        if let open = URL(string: "physarum://open") {
            let action = TVTopShelfAction(url: open)
            item.displayAction = action
            item.playAction = action
        }
        let content = TVTopShelfCarouselContent(style: .details, items: [item])
        completionHandler(content)
    }
}