mobile/iOS/starterapp/OpenWhiskStarterApp/ViewController.swift

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import UIKit
import OpenWhisk
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    @IBOutlet weak var whiskButton: WhiskButton!
    @IBOutlet weak var outputText: UITextView!
    @IBOutlet weak var statusLabel: UILabel!

    // Change to your whisk app key and secret.
    let WhiskAppKey: String = "MyAppKey"
    let WhiskAppSecret: String = "MyAppSecret"

    // the URL for Whisk backend
    let baseUrl: String? = "https://openwhisk.ng.bluemix.net"

    // The action to invoke.

    // Choice: specify components
    let MyNamespace: String = "whisk.system"
    let MyPackage: String? = "utils"
    let MyWhiskAction: String = "date"

    var MyActionParameters: [String:AnyObject]? = nil
    let HasResult: Bool = true // true if the action returns a result

    var session: URLSession!

    let locationManager = CLLocationManager()
    var currentLocation: [CLLocation]?

    override func viewDidLoad() {
        super.viewDidLoad()

        // create custom session that allows self-signed certificates
        let session = URLSession(configuration: URLSessionConfiguration.default, delegate: SelfSignedNetworkDelegate(), delegateQueue:OperationQueue.main)

        // create whisk credentials token
        let creds = WhiskCredentials(accessKey: WhiskAppKey,accessToken: WhiskAppSecret)

        // Setup action using components
        whiskButton.setupWhiskAction(MyWhiskAction, package: MyPackage, namespace: MyNamespace, credentials: creds, hasResult: HasResult, parameters: MyActionParameters, urlSession: session, baseUrl: baseUrl)

        // setup location
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()

        navigationItem.title = "Whisk"

    }

    @IBAction func whiskButtonPressed(sender: AnyObject) {
        // Set latitude and longitude parameters.
        if let currentLocation = currentLocation {
            MyActionParameters = ["latitude": currentLocation[0].coordinate.latitude as AnyObject, "longitude": currentLocation[0].coordinate.longitude as AnyObject]
        }

        // Invoke action with parameters.
        whiskButton.invokeAction(parameters: MyActionParameters, actionCallback: { reply, error in
            if let error = error {
                print("Oh no! \(error)")
                if case let WhiskError.httpError(description, statusCode) = error {
                    print("HttpError: \(description) statusCode:\(statusCode)")
                }
            } else if let reply = reply {
                let str = "\(reply)"
                print("reply: \(str)")
                self.statusLabel.text = "Action \(self.MyNamespace)/\(self.MyWhiskAction) returned \(str.count) characters"
                if let result = reply["result"] as? [String:AnyObject] {
                    self.displayOutput(reply: result)
                }
            } else {
                print("Success")
            }
        })
    }


    func displayOutput(reply: [String:AnyObject]) {
        if let date = reply["date"] as? String{
            self.outputText.text = "The date is \(reformatDate(dateStr: date))"
        }
    }

    // Optional, can be used to display results in a UITableView
    func displayResultView(reply: [String: AnyObject]) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "resultSetTable") as! ResultSetTableController
        vc.resultSet = reply
        self.navigationController?.pushViewController(vc, animated: true)
    }


    // CLLocationDelegate Functions
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        print("Got location manager authorization status \(status)")
        locationManager.startUpdatingLocation()

    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        currentLocation = locations
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // Convert string timestamp to a display format
    func reformatDate(dateStr: String) -> String {

        var newDateStr = dateStr
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"

        formatter.timeZone = TimeZone(abbreviation: "UTC") //NSTimeZone(name: "UTC")

        if let date = formatter.date(from: dateStr) {
            formatter.dateFormat = "MMM dd EEEE yyyy HH:mm"
            formatter.timeZone = TimeZone(abbreviation: "UTC")
            newDateStr = formatter.string(from: date)
        }

        return newDateStr
    }


}