import SwiftUI

struct Media: Identifiable {
    var id = UUID()
    var image: Image
}

struct ContentView: View {
    @State var itemProviders: [NSItemProvider] = []

    @State private var showingPhotoPicker: Bool = false
    
    let columns = [
        GridItem(.adaptive(minimum: 100, maximum: 100), spacing: 8)
    ]
    
    @State var medias: [Media] = []
    
    var body: some View {
        NavigationView {
            ScrollView {
                LazyVGrid(columns: columns, spacing: 8) {
                    ForEach(medias) { media in
                        media.image
                            .resizable()
                            .scaledToFill()
                            .frame(width: 100, height: 100, alignment: .center)
                            .clipped()
                    }
                }
            }
            .navigationBarTitle("Images \(medias.count)")
            .navigationBarItems(leading: Button(action: {
                loadImages()
            }, label: {
                Text("Import \(itemProviders.count) images")
            }), trailing: Button(action: {
                showingPhotoPicker.toggle()
            }, label: {
                Image(systemName: "photo.on.rectangle.angled")
            }))
            .sheet(isPresented: $showingPhotoPicker) {
                MultiPHPickerView(itemProviders: $itemProviders)
            }
        }
        
    }
    
    func loadImages() {
        for item in itemProviders {
            if item.canLoadObject(ofClass: UIImage.self) {
                item.loadObject(ofClass: UIImage.self) { image, error in
                    DispatchQueue.main.async {
                        guard let image = image as? UIImage else {
                            return
                        }
                        medias.append(Media(image: Image(uiImage: image)))
                    }
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}