import SwiftUI
import UIKit

struct AttachmentFilesPickerView: View {
    @EnvironmentObject var store: AppStore

    var body: some View {
        DocumentPicker(
            completion: { arr in
                let sharedFiles = arr.map {
                    ShareItem(
                        id: UUID().uuidString,
                        type: .file,
                        data: $0,
                        thumbnail: Data(),
                        string: ""
                    )
                }
                store.dispatch(.conversationAction(.sendAttachment(sharedFiles)))
                store.dispatch(.conversationAction(.showAttachmentPicker(false)))
            },
            cancel: {
                store.dispatch(.conversationAction(.showAttachmentPicker(false)))
            }
        )
    }
}

struct DocumentPicker: UIViewControllerRepresentable {
    let completion: ([Data]) -> Void
    let cancel: () -> Void

    func makeUIViewController(context: UIViewControllerRepresentableContext<DocumentPicker>) -> UIDocumentPickerViewController {
        let picker: UIDocumentPickerViewController
        picker = UIDocumentPickerViewController(forOpeningContentTypes: [.item], asCopy: true)
        picker.delegate = context.coordinator
        picker.allowsMultipleSelection = true
        return picker
    }

    func updateUIViewController(_: UIDocumentPickerViewController, context _: UIViewControllerRepresentableContext<DocumentPicker>) {}

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, UIDocumentPickerDelegate {
        var parent: DocumentPicker

        init(_ parent: DocumentPicker) {
            self.parent = parent
        }

        func documentPicker(_: UIDocumentPickerViewController, didPickDocumentsAt _: [URL]) {
            // TODO: Send documents
            // Handle the selected files
        }

        func documentPickerWasCancelled(_: UIDocumentPickerViewController) {
            parent.cancel()
        }
    }
}