/*

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

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 PlayersInterfaceController is a ListWithButtinInterfaceController subclass that specialize to loading recent players.  It adopts the ListDataSource protocol and extends GKPlayer with the ListItem protocol

 */

import WatchKit

import Foundation

import GameKit

extension GKPlayer: ListItem {

    // MARK: ListItem Properties

    var title: String {

        return alias ?? "<no nickname>"

    }

    var detail: String {

        return displayName ?? "<no displayName>"

    }

}

class PlayersInterfaceController: ListWithButtonInterfaceController, ListDataSource {

    // MARK: WKInterfaceController

    override func awake(withContext context: Any?) {

        dataSource = self

        super.awake(withContext: context)

    }

    // MARK: ListDataSource methods

    func buttonTitle() -> String {

        return "Auto Match"

    }

    func loadItems(completionHandler: @escaping (([ListItem]) -> Void)) {

        guard loadingState != .loading else { return }

        loadingState = .loading

        GKLocalPlayer.localPlayer().loadRecentPlayers { [unowned self] (players, error) in

            if let items = players {

                let result = items.sorted { (p1, p2) -> Bool in

                    guard let displayName1 = p1.displayName, let displayName2 = p2.displayName else { return false }

                    return displayName1 < displayName2

                }

                completionHandler(result)

            }

            else {

                // No players were found.

                completionHandler([])

            }

            self.loadingState = error == nil ? .complete: .failed

        }

    }

    override func didSelect(item: ListItem?) {

        let player = item as? GKPlayer

        if let controller = presentingController {

            loadingState = .exiting

            controller.didSelect(player: player)

        }

    }

}