SwiftUI

@MainActor
final class EpisodeModel: ObservableObject {
    let player: AVPlayer
    let ads: VideoAds
    @Published var adOnScreen: VideoAd?
    private var pauseAd: VideoAd?

    init(episode: Episode) {
        player = AVPlayer(url: episode.url)
        ads = VideoAds(content: episode.content)
        ads.track(player)
        Task { pauseAd = try? await prepare(.pause) }
    }

    func viewerPaused() {
        player.pause()
        adOnScreen = pauseAd           // VideoAdHost shows it
    }

    func adEnded(_ ad: VideoAd, _ reason: VideoAd.EndReason) {
        adOnScreen = nil
        if reason == .resumed { player.play() }
        Task { pauseAd = try? await prepare(.pause) }   // the next one, ready early
    }

    private func prepare(_ format: AdFormat) async throws -> VideoAd {
        let ad = try await ads.format(format)
        try await ad.load()
        return ad
    }
}

struct EpisodeScreen: View {
    @StateObject var model: EpisodeModel

    var body: some View {
        VideoPlayer(player: model.player)
            .overlay(VideoAdHost(ad: model.adOnScreen, onEnd: model.adEnded))
    }
}

VideoAdHost(
    ad: model.adOnScreen,
    insets: UIEdgeInsets(top: 0, left: 0, bottom: 80, right: 0),   // clear of your own controls
    onShowFailed: { ad, error in },     // could not be shown: nothing was shown, no onEnd follows
    onImpression: { ad in },
    onClick: { ad, click in },
    onEnd: { ad, reason in }            // set your ad back to nil here
)