Meet MusicKit for Swift

// Loading and accessing relationships

let detailedAlbum = try await album.with([.artists, .tracks, .relatedAlbums])
print("\(detailedAlbum)")

if let tracks = detailedAlbum.tracks {
    print("  Tracks:")
    tracks.prefix(2).forEach { track in
        print("    \(track)")
    }
}

// Loading and accessing associations

let detailedAlbum = try await album.with([.artists, .tracks, .relatedAlbums])
print("\(detailedAlbum)")

if let relatedAlbums = detailedAlbum.relatedAlbums {
    print("  \(relatedAlbums.title ?? ""):")
    relatedAlbums.prefix(2).forEach { relatedAlbum in
        print("    \(relatedAlbum)")
    }
}

// Loading top level genres

struct MyGenresResponse: Decodable {
    let data: [Genre]
}

let countryCode = try await MusicDataRequest.currentCountryCode
let url = URL(string: "https://api.music.apple.com/v1/catalog/\(countryCode)/genres")!

let dataRequest = MusicDataRequest(urlRequest: URLRequest(url: url))
let dataResponse = try await dataRequest.response()

let decoder = JSONDecoder()
let genresResponse = try decoder.decode(MyGenresResponse.self, from: dataResponse.data)
print("\(genresResponse.data[9])")

// Requesting user consent for MusicKit

@State var isAuthorizedForMusicKit = false

func requestMusicAuthorization() {
    detach {
        let authorizationStatus = await MusicAuthorization.request()
        if authorizationStatus == .authorized {
            isAuthorizedForMusicKit = true
        } else {
            // User denied permission.
        }
    }
}

// Using music subscription to drive state of a play button

@State var musicSubscription: MusicSubscription?

var body: some View {
    Button(action: handlePlayButtonSelected) {
        Image(systemName: "play.fill")
    }
    .disabled(!(musicSubscription?.canPlayCatalogContent ?? false))
    .task {
        for await subscription in MusicSubscription.subscriptionUpdates {
            musicSubscription = subscription
        }
    }
}

// Showing contextual music subscription offer

@State var musicSubscription: MusicSubscription?
@State var isShowingOffer = false

var offerOptions: MusicSubscriptionOffer.Options {
    var offerOptions = MusicSubscriptionOffer.Options()
    offerOptions.itemID = album.id
    return offerOptions
}

var body: some View {
    Button("Show Subscription Offers", action: showSubscriptionOffer)
        .disabled(!(musicSubscription?.canBecomeSubscriber ?? false))
        .musicSubscriptionOffer(isPresented: $isShowingOffer, options: offerOptions)
}

func showSubscriptionOffer() {
    isShowingOffer = true
}