//
//  CheckboxGroup.swift
//  VDS
//
//  Created by Matt Bruce on 8/23/22.
//

import Foundation
import UIKit

@objc(VDSCheckboxGroup)
public class CheckboxGroup: CheckboxGroupBase<Checkbox> {
    public override func didSelect(_ selectedControl: Checkbox) {
        selectedControl.toggle()
        if selectedControl.isSelected, showError{
            showError.toggle()
        }
        valueChanged()
    }
}

public class CheckboxGroupBase<HandlerType: CheckboxBase>: SelectorGroupHandlerBase<HandlerType> {

    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    
    public override var selectorViews: [HandlerType] {
        didSet {
            for selector in selectorViews {
                if !mainStackView.arrangedSubviews.contains(selector) {
                    selector
                        .publisher(for: .touchUpInside)
                        .sink { [weak self] handler in
                            self?.didSelect(handler)
                        }.store(in: &subscribers)
                    mainStackView.addArrangedSubview(selector)
                }
            }
        }
    }
    
    private var _showError: Bool = false
    public var showError: Bool {
        get { _showError }
        set {
            var newShowError = newValue
            let anySelected = selectorViews.filter { $0.isSelected == true }.count > 0
            if anySelected && newShowError {
                newShowError = false
            }
            selectorViews.forEach { handler in
                handler.showError = newShowError
            }
            _showError = newShowError
        }
    }
    
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var mainStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.alignment = .fill
            $0.distribution = .fill
            $0.axis = .vertical
            $0.spacing = 10
        }
    }()
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    open override func setup() {
        super.setup()
        
        isAccessibilityElement = true
        accessibilityTraits = .button
        addSubview(mainStackView)
        
        mainStackView.pinToSuperView()
    }
    
    public var selectedHandlers: [HandlerType]? {
        let selected = selectorViews.filter{ $0.isSelected == true }
        guard selected.count > 0 else { return nil }
        return selected
    }
}