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public typealias ModuleCallback = ([String: Any]?, Data?, URLResponse?, Error?) -> Void

/**
 Protocol defines application router, which function is
 
 - register application modules
 - access/open the modules
 - provide the callback, result of the access
 */
protocol ApplicationRouterType: class {

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public typealias ModuleParameters = [String: String]

/**
 Application module represents a group off all the classes that implement a certain functionality of the module, like:
 
 - Storyboard
 - View Controllers
 - Views, specific to the module
 - Presenters, View Models and other Client architecture classes
 - ...

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class LoginModule: ModuleType {
    
    var route: String = {
            return "login"
    }()
    
    var paths: [String] = {
        return ["/login",
                "/logout",
                "/payment-token"]

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class ApplicationServices {
    
    // ApplicationServices is a singleton, because it makes it easier to be accessed from anywhere to access its functions/services
    static let shared = ApplicationServices()
    let appRouter = ApplicationRouter()
    
    func pay(amount: Double,
             username: String,
             password: String,
             completion: @escaping (() -> Void)) {

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/**
 This interface defines few simple steps:
    - store the module route, so it can be accessed many times
    - route the request sent to the module with parameters to desired functionality which is encapsulated in the module
 */
protocol ModuleRouter {
    
    var route: String { get set }
    init(route: String)
    

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class LoginInteractor {
    
    func getPaymentToken(parameters: ModuleParameters?,
                         completion: @escaping (String?, HTTPURLResponse?, Error?) -> Void) {
        
        let service = MockLoginNetworkService()
        guard let parameters = parameters,
                let username = parameters[LoginModuleParameters.username.rawValue],
                let password = parameters[LoginModuleParameters.password.rawValue] else {
                return

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class PaymentsModuleRouter: ModuleRouter {
    
    lazy var interactor = PaymentInteractor()
    internal var route: String
    
    required init(route: String) {
        
        self.route = route
    }
    

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enum HTTPMethod: String {
    
    case GET
    case POST
}

class NetworkService {
    
    func get(scheme: String? = nil,
             host: String,

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@objc class URLRouter: URLProtocol, URLSessionDataDelegate, URLSessionTaskDelegate {
    
    // TODO: This is synchronisyng only write access, which might be inadequate in many cases
    // Need to be replaced with proper full generic implementation of synchronized collection
    private (set) var moduleQueue = DispatchQueue(label: "com.tandem.module.queue")
    
    // MARK: URLProtocol methods overriding
    
    override class func canInit(with task: URLSessionTask) -> Bool {
        

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let nonCompliantModule = NonConformingModule()
nonCompliantModule.login(username: "myUsername",
                         password: "myPassword",
                         completion: { (bearerToken, error) in
                                
     print(String(describing: bearerToken))
 })

class NonConformingModule {