//
//  AirDropService.swift
//  MioIsland AirDrop Plugin
//
//  Thin wrapper around NSSharingService(.sendViaAirDrop). This is a
//  100% public Apple API — no entitlements, no permissions, no
//  private frameworks. When invoked, macOS pops the native AirDrop
//  chooser sheet; we don't render the device list ourselves.
//

import AppKit
import Foundation

enum AirDropError: Error, LocalizedError {
    case serviceUnavailable
    case cannotPerform

    var errorDescription: String? {
        switch self {
        case .serviceUnavailable:
            return L10n.errServiceUnavailable
        case .cannotPerform:
            return L10n.errCannotPerform
        }
    }
}

enum AirDropService {
    /// Invoke macOS' AirDrop chooser for the given files.
    ///
    /// NSSharingService does NOT surface per-recipient completion,
    /// so we can only distinguish "could not start" vs "started and
    /// returned control to us". A returned .success(()) means the
    /// chooser sheet was presented; the user may have cancelled it,
    /// but from our UI perspective we treat it as handled.
    static func perform(
        files: [URL],
        completion: @escaping (Result<Void, Error>) -> Void
    ) {
        DispatchQueue.main.async {
            guard let service = NSSharingService(named: .sendViaAirDrop) else {
                completion(.failure(AirDropError.serviceUnavailable))
                return
            }
            guard service.canPerform(withItems: files) else {
                completion(.failure(AirDropError.cannotPerform))
                return
            }
            service.perform(withItems: files)
            // AirDrop chooser is modal; perform() returns right after
            // presenting. Treat that as success.
            completion(.success(()))
        }
    }
}