import Foundation
import Network

// MARK: - NetworkMonitor
// Monitors network connectivity. Inject as an environment object for offline UI.

@MainActor
final class NetworkMonitor: ObservableObject {
    static let shared = NetworkMonitor()

    @Published var isConnected: Bool = true
    @Published var connectionType: NWInterface.InterfaceType?

    private let monitor = NWPathMonitor()
    private let queue = DispatchQueue(label: "cc.kalekber.libnovel.v2.network-monitor")

    init() {
        monitor.pathUpdateHandler = { [weak self] path in
            Task { @MainActor [weak self] in
                self?.isConnected     = path.status == .satisfied
                self?.connectionType  = path.availableInterfaces.first?.type
            }
        }
        monitor.start(queue: queue)
    }

    deinit {
        monitor.cancel()
    }
}

extension NWInterface.InterfaceType {
    var displayName: String {
        switch self {
        case .wifi:          return "Wi-Fi"
        case .cellular:      return "Cellular"
        case .wiredEthernet: return "Ethernet"
        case .loopback:      return "Loopback"
        case .other:         return "Other"
        @unknown default:    return "Unknown"
        }
    }
}