import SwiftUI
import UIKit

/// Native camera capture via UIImagePickerController, wrapped for SwiftUI.
/// Falls back to the photo library on the simulator where no camera exists.
struct CameraPicker: UIViewControllerRepresentable {
    let onCapture: (Data) -> Void
    @Environment(\.dismiss) private var dismiss

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

    func makeUIViewController(context: Context) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            picker.sourceType = .camera
            picker.cameraCaptureMode = .photo
        } else {
            // Simulator has no camera — let testing still work via library.
            picker.sourceType = .photoLibrary
        }
        return picker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}

    final class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        let parent: CameraPicker
        init(_ parent: CameraPicker) { self.parent = parent }

        func imagePickerController(
            _ picker: UIImagePickerController,
            didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]
        ) {
            if let image = info[.originalImage] as? UIImage,
               let data = image.jpegData(compressionQuality: 0.9) {
                parent.onCapture(data)
            }
            parent.dismiss()
        }

        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            parent.dismiss()
        }
    }
}