/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 UITableViewController subclass which lets the user select the type of transition for their composition.

 */

import UIKit

import Foundation

protocol APLTransitionTypePickerDelegate: class {

    func transitionTypeController(_ controller: APLTransitionTypeController, transitionType: Int)

    func transitionTypeControllerDismiss()

}

/*

 The transition type: diagonal wipe or cross dissolve.

 These values correspond to the underlying UITableViewCell.tag values in the "Set Transition" Table View in

 the Storyboard.

 */

enum TransitionType: Int {

    case diagonalWipe = 0

    case crossDissolve = 1

}

class APLTransitionTypeController: UITableViewController {

    /// UITableViewCell corresponding to the diagonal wipe transition selection.

    @IBOutlet var diagonalWipeCell: UITableViewCell!

    /// UITableViewCell corresponding to the cross disslove transition selection.

    @IBOutlet var crossDissolveCell: UITableViewCell!

    /// Currently selected transition.

    var currentTransition: Int

    /// The APLTransitionTypePickerDelegate that will respond to user interaction events.

    weak var delegate: APLTransitionTypePickerDelegate?

    required init?(coder aDecoder: NSCoder) {

        currentTransition = TransitionType.diagonalWipe.rawValue

        super.init(coder: aDecoder)

    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

        guard let selectedCell = tableView.cellForRow(at: indexPath) else { return }

        selectedCell.accessoryType = .checkmark

        guard let transitionTypeControllerDelegate = self.delegate else { return }

        switch selectedCell.tag {

            case TransitionType.diagonalWipe.rawValue:

                if let crossDissolveCell = self.crossDissolveCell {

                    crossDissolveCell.accessoryType = .none

                }

                transitionTypeControllerDelegate.transitionTypeController(self, transitionType: TransitionType.diagonalWipe.rawValue)

                self.currentTransition = TransitionType.diagonalWipe.rawValue

            case TransitionType.crossDissolve.rawValue:

                if let diagonalWipeCell = self.diagonalWipeCell {

                    diagonalWipeCell.accessoryType = .none

                }

                transitionTypeControllerDelegate.transitionTypeController(self, transitionType: TransitionType.crossDissolve.rawValue)

                self.currentTransition = TransitionType.crossDissolve.rawValue

            default:

                print("A supported transition type was not selected.")

        }

        tableView.deselectRow(at: indexPath, animated: true)

    }

    @IBAction func transitionSelected() {

        guard let transitionTypeControllerDelegate = self.delegate else { return }

        transitionTypeControllerDelegate.transitionTypeControllerDismiss()

    }

}