//
//  RadioButtonContainer.swift
//  PrivadoVPN
//
//  Created by Murad Shabanov on 29.07.2021.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import Foundation

/// Hold all Radio Buttons
class RadioButtonContainer: RadioBaseContainer<RadioButton> {
    
    /// Radio button delegate will be assigned to all button added in container
    public weak var delegate: RadioButtonDelegate? {
        didSet {
            self.allButtons.forEach { $0.delegate = delegate }
        }
    }
    
    /// Select any radio button available in container. It will automatically deselect all other buttons
    public var selectedButton: Kind? {
        get { return selectedButtons.first }
        set {
            guard let button = newValue else {
                self.deselectAll()
                return
            }
            self.selectedButtons = [button]
        }
    }
    
    /// Making sure new button must have delegate assigned
    @discardableResult
    public override func addButton(_ button: Kind) -> Bool {
        button.delegate = self.delegate
        return super.addButton(button)
    }
    
    /// Deselecting previous selected button
    override func selectionChangeObserver(_ button: RadioButton, _ change: NSKeyValueObservedChange<Bool>) {
        super.selectionChangeObserver(button, change)
        if button.isOn {
            // Deselect on selected button excepting current selected button
            self.allButtons.forEach {
                if $0.isOn, button != $0 {
                    $0.isOn = false
                }
            }
        }
    }
}