/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 Utilites for workout management and string formatting.

 */

import Foundation

import HealthKit

func computeDurationOfWorkout(withEvents workoutEvents: [HKWorkoutEvent]?, startDate: Date?, endDate: Date?) -> TimeInterval {

    var duration = 0.0

    if var lastDate = startDate {

        var paused = false

        if let events = workoutEvents {

            for event in events {

                switch event.type {

                    case .pause:

                        duration += event.date.timeIntervalSince(lastDate)

                        paused = true

                    case .resume:

                        lastDate = event.date

                        paused = false

                    default:

                        continue

                }

            }

        }

        if !paused {

            if let end = endDate {

                duration += end.timeIntervalSince(lastDate)

            } else {

                duration += NSDate().timeIntervalSince(lastDate)

            }

        }

    }

    print("\(duration)")

    return duration

}

func format(energy: HKQuantity) -> String {

    return String(format: "%.1f Calories", energy.doubleValue(for: HKUnit.kilocalorie()))

}

func format(distance: HKQuantity) -> String {

    return String(format: "%.1f Meters", distance.doubleValue(for: HKUnit.meter()))

}

func format(duration: TimeInterval) -> String {

    let durationFormatter = DateComponentsFormatter()

    durationFormatter.unitsStyle = .positional

    durationFormatter.allowedUnits = [.second, .minute, .hour]

    durationFormatter.zeroFormattingBehavior = .pad

    if let string = durationFormatter.string(from: duration) {

        return string

    } else {

        return ""

    }

}

func format(activityType: HKWorkoutActivityType) -> String {

    let formattedType : String

    switch activityType {

        case .walking:

            formattedType = "Walking"

        case .running:

            formattedType = "Running"

        case .hiking:

            formattedType = "Hiking"

        default:

            formattedType = "Workout"

    }

    return formattedType

}

func format(locationType: HKWorkoutSessionLocationType) -> String {

    let formattedType : String

    switch locationType {

        case .indoor:

            formattedType = "Indoor"

        case .outdoor:

            formattedType = "Outdoor"

        case .unknown:

            formattedType = "Unknown"

    }

    return formattedType

}