import Foundation

@MainActor
final class DeviceViewModel: ObservableObject {
    @Published var snapshot: DeviceSnapshot?
    @Published var isLoading = false
    @Published var errorMessage: String?

    let instance: Instance
    private let service: DeviceService

    init(instance: Instance, service: DeviceService) {
        self.instance = instance
        self.service = service
    }

    func refresh() async {
        isLoading = true
        errorMessage = nil
        do {
            snapshot = try await service.snapshot(instance)
        } catch DeviceServiceError.unauthorized {
            errorMessage = "需要实例密码登录后才能读取设备数据。"
        } catch {
            errorMessage = "无法加载设备数据。"
        }
        isLoading = false
    }
}