meh

class ViewController: UIViewController {

    var urlSession = URLSession(configuration: .default)

    override func viewDidLoad() {
        super.viewDidLoad()

        authorize(withCode: "REMOVED") { (error) in
            print(error)
        }
    }


    func buildURL(appendingPath: String, withGetParameters: [String: String]) -> URL {

        var items = Array<URLQueryItem>()
        var components = URLComponents(string: appendingPath)!

        for key in withGetParameters {
            let queryItem = URLQueryItem(name: key.0, value: key.1)
            items.append(queryItem)
        }

        components.queryItems = items;
        return components.url!
    }

    func buildPOSTTask(onURLSession urlSession: URLSession, appendingPath path: String, withPostParameters postParams: [String : String]?, getParameters getParams: [String : String]?, httpHeaders: [String : String]?, completionHandler completion: (Data?, URLResponse?, NSError?) -> Void) -> URLSessionUploadTask {
        let fullURL: URL
        if let gets = getParams {
            fullURL = buildURL(appendingPath: "https://anilist.co/api/" + path, withGetParameters: gets)
        }
        else {
            fullURL = URL(string: path, relativeTo: URL(string: "https://anilist.co/api")!)!
        }

        var request = URLRequest(url: fullURL)
        request.httpMethod = "POST"

        var postParameters: Data? = nil

        if let posts = postParams {
            do {
                postParameters = try JSONSerialization.data(withJSONObject: posts, options: [])
            } catch let error as NSError {
                fatalError("[\(#function) \(#line)]: Could not build POST task: \(error.localizedDescription)")
            }
        }

        return urlSession.uploadTask(with: request, from: postParameters, completionHandler: completion)
    }

    func authorize(withCode code: String?, completion: (NSError?) -> Void) {

        let body: [String: String] = ["client_secret": "REMOVED",
                                      "grant_type": "authorization_code",
                                      "redirect_uri": "genericwebsitethatshouldntexist.bo",
                                      "client_id": "ibanez-hod6w",
                                      "code": code ?? "REMOVED"];

        let obtainTokenTask = buildPOSTTask(onURLSession: self.urlSession, appendingPath: "auth/access_token", withPostParameters: nil, getParameters: body, httpHeaders: nil) { (data, response, error) in
            if let err = error {
                completion(err)
            } else {
                print("Response is \(response)")
                completion(nil)
            }
        }

        obtainTokenTask.resume()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}