import Defaults
import SwiftUI

struct VideosCellsHorizontal: View {
    #if os(iOS)
        @Environment(\.verticalSizeClass) private var verticalSizeClass
    #endif

    var videos = [Video]()

    var body: some View {
        ScrollViewReader { scrollView in
            ScrollView(.horizontal, showsIndicators: false) {
                LazyHStack(spacing: 20) {
                    ForEach(videos) { video in
                        VideoView(video: video)
                            .environment(\.horizontalCells, true)
                        #if os(tvOS)
                            .frame(width: 580)
                            .padding(.trailing, 20)
                            .padding(.bottom, 40)
                        #else
                            .frame(width: 300)
                        #endif
                    }
                }
                #if os(tvOS)
                    .padding(.horizontal, 40)
                    .padding(.vertical, 30)
                #else
                    .padding(.horizontal, 15)
                    .padding(.vertical, 20)
                #endif
            }
            .onAppear {
                if let video = videos.first {
                    scrollView.scrollTo(video.id, anchor: .leading)
                }
            }
            .onChange(of: videos) { [videos] newVideos in
                #if !os(tvOS)
                    guard !videos.isEmpty, let video = newVideos.first else {
                        return
                    }

                    scrollView.scrollTo(video.id, anchor: .leading)
                #endif
            }
        }
        #if os(tvOS)
            .frame(height: 560)
        #else
            .frame(height: 280)
        #endif

        .edgesIgnoringSafeArea(.horizontal)
    }
}

struct VideoCellsHorizontal_Previews: PreviewProvider {
    static var previews: some View {
        VideosCellsHorizontal(videos: Video.allFixtures)
            .injectFixtureEnvironmentObjects()
    }
}