import SDWebImageSwiftUI
import SwiftUI

struct ThumbnailView: View {
    var url: URL?

    @ObservedObject private var imageManager = ImageManager()
    private var thumbnails = ThumbnailsModel.shared

    init(url: URL? = nil) {
        self.url = url
    }

    var body: some View {
        Group {
            if imageManager.image != nil {
                #if os(macOS)
                    Image(nsImage: imageManager.image!)
                        .resizable()
                #else
                    Image(uiImage: imageManager.image!)
                        .resizable()
                #endif
            } else {
                Rectangle().fill(Color("PlaceholderColor"))
                    .onAppear {
                        self.imageManager.setOnFailure { _ in
                            guard let url else { return }
                            self.thumbnails.insertUnloadable(url)
                        }
                        self.imageManager.load(url: url)
                    }
                    .onDisappear { self.imageManager.cancel() }
            }
        }
    }
}