/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Custom app delegate for the LoopHealth app. Manages an app-wide `HKHealthStore` instance.

 */

import UIKit

import HealthKit

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate {

    // MARK: Properties

    var window: UIWindow?

    let healthStore: HKHealthStore

    // MARK: - Initializers

    override init() {

        guard HKHealthStore.isHealthDataAvailable() else { fatalError("This app requires a device that supports HealthKit") }

        healthStore = HKHealthStore()

    }

    // MARK: UIApplicationDelegate

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {

        // Enumerate the view controller heirarchy, setting the health store where appropriate.

        window?.rootViewController?.enumerateHierarchy { viewController in

            guard var healthStoreContainer = viewController as? HealthStoreContainer else { return }

            healthStoreContainer.healthStore = healthStore

        }

        return true

    }

}