/*

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

See LICENSE.txt for this sample’s licensing information

Abstract:

This class manages the presentation of the Historical view of the users activity.

*/

import UIKit

class HistoryViewController: UIViewController, UITableViewDataSource {

    // MARK: Properties

    static let textCellIdentifier = "HistoryCell"

    let motionManager = MotionManager()

    @IBOutlet weak var historyTableView: UITableView!

    /**

        An array of title / detail text label creation handlers. The left hand

        side string is the title of the label, while the right hand side is a closure

        that maps an `Activity` to some derived property of the activity to use

        in a text label.

    */

    let recentActivityItems: [(text: String, detailTextCreationHandler: (Activity) -> String)] = [

        ("Start Date",          { $0.startDateDescription }),

        ("End Date",            { $0.endDateDescription }),

        ("Duration",            { $0.activityDuration }),

        ("Pace Per Mile",       { $0.calculatedPace }),

        ("Distance (Miles)",    { $0.distanceInMiles }),

        ("Distance (Meters)",   { String($0.distance ?? 0) }),

        ("Number of Steps",     { String($0.numberOfSteps ?? 0) }),

        ("Floors Ascended",     { String($0.floorsAscended ?? 0) }),

        ("Floors Descended",    { String($0.floorsDescended ?? 0) })

    ]

    // MARK: View Controller

    override func viewDidLoad() {

        super.viewDidLoad()

        setNeedsStatusBarAppearanceUpdate()

    }

    override func viewWillAppear(_ animated: Bool) {

        // The `completionHandler` is executed on the main thread.

        motionManager.queryForRecentActivityData(historyTableView.reloadData)

    }

    // MARK: UITableViewDataSource

    func numberOfSections(in tableView: UITableView) -> Int {

        return self.motionManager.recentActivities.count

    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        // This is the number of properties defined in `recentActivityItems(_:)`.

        let activity = motionManager.recentActivities[section].activity

        if activity.running || activity.walking {

            // Display all of the fields for running and walking.

            return recentActivityItems.count

        }

        else {

            // For all other activities only present Start Date, End Date, and Duration.

            return 3

        }

    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: HistoryViewController.textCellIdentifier, for: indexPath)

        let activity = motionManager.recentActivities[indexPath.section]

        let item = recentActivityItems[indexPath.row]

        cell.textLabel!.text = item.text

        cell.detailTextLabel!.text = item.detailTextCreationHandler(activity)

        cell.isUserInteractionEnabled = false

        return cell

    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {

        return motionManager.recentActivities[section].activityType

    }

}