/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Demonstrates the APIs to check and request access to home information.

 */

import Foundation

import HomeKit

class HomeAccessProvider: NSObject {

    var homeManager: HMHomeManager?

    var requestAccessCompletionHandler: PrivacyActionRequestAccessHandler?

    private func dispatchAccessResult(_ result: PrivateDataRequestAccessResult) {

        DispatchQueue.main.async {

            guard let completionHandler = self.requestAccessCompletionHandler else { return }

            completionHandler(result)

            // Breaks reference cycle so this object can deinit.

            self.requestAccessCompletionHandler = nil

        }

    }

}

extension HomeAccessProvider: PrivateDataAccessRequestProvider {

    func requestAccess(completionHandler: @escaping (PrivateDataRequestAccessResult) -> Void) {

        requestAccessCompletionHandler = completionHandler

        /*

         HMHomeManager will notify the delegate when it's ready to vend home data.

         It will ask for user permission first, if needed.

         */

        homeManager = HMHomeManager()

        homeManager?.delegate = self

    }

}

extension HomeAccessProvider: HMHomeManagerDelegate {

    func homeManagerDidUpdateHomes(_ manager: HMHomeManager) {

        if !manager.homes.isEmpty {

            // A home exists, so we have access.

            dispatchAccessResult(PrivateDataRequestAccessResult(.granted))

        } else {

            manager.addHome(withName: "Test Home", completionHandler: { (home, error) in

                guard error == nil else {

                    if let error = error as? HMError {

                        if error.code == .homeAccessNotAuthorized {

                            self.dispatchAccessResult(PrivateDataRequestAccessResult(.denied))

                        }

                    } else if let error = error as NSError? {

                        let result = PrivateDataRequestAccessResult(.undetermined, error: error, errorMessageKey: "HOME_ERROR")

                        self.dispatchAccessResult(result)

                    }

                    return

                }

                if let home = home {

                    // Clean up after ourselves, don't leave the Test Home in the HMHomeManager array.

                    manager.removeHome(home, completionHandler: { (_) in

                        // ... do something with the result of removing the home ...

                    })

                }

                self.dispatchAccessResult(PrivateDataRequestAccessResult(.granted))

            })

        }

    }

}