/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 This class manages the HealthKit interactions and provides a delegate 

         to indicate changes in data.

 */

import Foundation

import HealthKit

/**

 `WorkoutManagerDelegate` exists to inform delegates of swing data changes.

 These updates can be used to populate the user interface.

 */

protocol WorkoutManagerDelegate: class {

    func didUpdateForehandSwingCount(_ manager: WorkoutManager, forehandCount: Int)

    func didUpdateBackhandSwingCount(_ manager: WorkoutManager, backhandCount: Int)

}

class WorkoutManager: MotionManagerDelegate {

    // MARK: Properties

    let motionManager = MotionManager()

    let healthStore = HKHealthStore()

    weak var delegate: WorkoutManagerDelegate?

    var session: HKWorkoutSession?

    // MARK: Initialization

    init() {

        motionManager.delegate = self

    }

    // MARK: WorkoutManager

    func startWorkout() {

        // If we have already started the workout, then do nothing.

        if (session != nil) {

            return

        }

        // Configure the workout session.

        let workoutConfiguration = HKWorkoutConfiguration()

        workoutConfiguration.activityType = .tennis

        workoutConfiguration.locationType = .outdoor

        do {

            session = try HKWorkoutSession(configuration: workoutConfiguration)

        } catch {

            fatalError("Unable to create the workout session!")

        }

        // Start the workout session and device motion updates.

        healthStore.start(session!)

        motionManager.startUpdates()

    }

    func stopWorkout() {

        // If we have already stopped the workout, then do nothing.

        if (session == nil) {

            return

        }

        // Stop the device motion updates and workout session.

        motionManager.stopUpdates()

        healthStore.end(session!)

        // Clear the workout session.

        session = nil

    }

    // MARK: MotionManagerDelegate

    func didUpdateForehandSwingCount(_ manager: MotionManager, forehandCount: Int) {

        delegate?.didUpdateForehandSwingCount(self, forehandCount: forehandCount)

    }

    func didUpdateBackhandSwingCount(_ manager: MotionManager, backhandCount: Int) {

        delegate?.didUpdateBackhandSwingCount(self, backhandCount: backhandCount)

    }

}