/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    The `DesignatorController` allows selection of a designator from the NATO phonetic alphabet. `DesignatorController` has a delegate used to provide the user's selection back to the parent controller. Additionally, a `DesignatorContext` class is provided for use by segues transitioning to this controller.

*/

import WatchKit

import WatchConnectivity

protocol DesignatorControllerDelegate: class {

    func designatorController(_ controller: DesignatorController, didSelect designator: String)

}

class DesignatorController: WKInterfaceController {

    // MARK: Properties

    @IBOutlet var designatorPicker: WKInterfacePicker!

    let designators = [

        "alpha", "bravo", "charlie", "delta", "echo", "foxtrot", "golf", "hotel", "india", "juliet", "kilo", "lima", "mike", "november", "oscar", "papa", "quebec", "romeo", "sierra", "tango", "uniform", "victor", "whiskey", "x-ray", "yankee", "zulu"

    ]

    var currentDesignator: String?

    weak var delegate: DesignatorControllerDelegate?

    override init() {

        super.init()

        let items: [WKPickerItem] = designators.map {

            let item = WKPickerItem()

            item.title = $0

            return item

        }

        designatorPicker.setItems(items)

    }

    override func awake(withContext context: Any?) {

        precondition(context is DesignatorContext, "Expected class of `context` to be `DesignatorContext`.")

        let designatorContext = context as! DesignatorContext

        delegate = designatorContext.delegate

        currentDesignator = designatorContext.currentDesignator

        if let currentIndex = designators.index(of: designatorContext.currentDesignator) {

            designatorPicker.setSelectedItemIndex(currentIndex)

        }

    }

    @IBAction func designationSelected(index: Int) {

        let designator = designators[index]

        currentDesignator = designator

    }

    @IBAction func saveDesignator() {

        delegate?.designatorController(self, didSelect: currentDesignator!)

    }

}

class DesignatorContext {

    weak var delegate: DesignatorControllerDelegate?

    let currentDesignator: String

    init(currentDesignator: String, delegate: DesignatorControllerDelegate) {

        self.currentDesignator = currentDesignator

        self.delegate = delegate

    }

}