// GitHub+Providers.swift

import Superb
import SuperbGitHub

extension GitHubOAuthProvider {
  static var shared: GitHubOAuthProvider {
    // Register a provider to handle callback URLs
    return Superb.register(
      GitHubOAuthProvider(
        clientId: "<your client id>",
        clientSecret: "<your client secret>",
        redirectURI: URL(string: "<your chosen redirect URI>")!
      )
    )
  }
}

// AppDelegate.swift

@UIApplicationMain
final class AppDelegate: UIResponder, UIApplicationDelegate {
  // ...

  func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey: Any]) -> Bool {
    // Pass the URL and options off to Superb.
    return Superb.handleAuthenticationRedirect(url, options: options)
  }
}

// GitHubAPIClient.swift

struct GitHubAPIClient {
  static let oauthClient = GitHubAPIClient(
    requestAuthorizer: RequestAuthorizer(
      authorizationProvider: GitHubOAuthProvider.shared
    )
  )

  private let authorizer: RequestAuthorizerProtocol

  init(requestAuthorizer: RequestAuthorizerProtocol) {
    authorizer = requestAuthorizer
  }

  // An authorized request to get the current user's profile.
  func getProfile(completionHandler: @escaping (Result<Profile, SuperbError>) -> Void) {
    let request = URLRequest(url: URL(string: "https://api.github.com/user")!)

    authorizer.performAuthorized(request) { result in
      switch result {
      case let .success(data, _):
        let profile = parseProfile(from: data)
        completionHandler(.success(profile))

      case let .failure(error):
        completionHandler(.failure(error))
      }
    }
  }

  // An unauthorized request.
  func getZen(completionHandler: @escaping (Result<String, SuperbError>) -> Void) {
    let request = URLRequest(url: URL(string: "https://api.github.com/zen")!)

    URLSession.shared.dataTask(with: request) { data, _, error in
      let result = parseZen(data, error)
      completionHandler(result)
    }.resume()
  }
}

// later
let api = GitHubAPIClient.oauthClient

api.getProfile { result in
  // ...
}