vds_ios/VDS/Components/RadioButton/RadioButtonGroup.swift

//
//  RadioButtonGroup.swift
//  VDS
//
//  Created by Matt Bruce on 8/11/22.
//

import Foundation
import UIKit

@objc(VDSRadioButtonGroup)
open class RadioButtonGroup: SelectorGroupSelectedHandlerBase<RadioButtonItem> {
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
    }
    
    public override init(frame: CGRect) {
        super.init(frame: .zero)
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
    }

    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var mainStackView: UIStackView = {
        return UIStackView().with {
            $0.translatesAutoresizingMaskIntoConstraints = false
            $0.alignment = .fill
            $0.distribution = .fill
            $0.axis = .vertical
            $0.spacing = VDSLayout.Spacing.space6X.value
        }
    }()
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    /// Array of ``RadioButtonItem`` that the user will have the ability to select from.
    public override var selectorViews: [RadioButtonItem] {
        willSet {
            mainStackView.arrangedSubviews.forEach { $0.removeFromSuperview() }
        }
        
        didSet {
            for selector in selectorViews {
                selector.onClick = { [weak self] handler in
                    self?.didSelect(handler)
                    self?.setNeedsUpdate()
                }
                mainStackView.addArrangedSubview(selector)
            }
        }
    }
    
    /// Array of ``RadioButtonItemModel`` that will be used to build the selectorViews of type ``RadioButtonItem``.
    open var selectorModels: [RadioButtonItemModel]? {
        didSet {
            if let selectorModels {
                selectorViews = selectorModels.enumerated().map { index, model in
                    return RadioButtonItem().with {
                        $0.isEnabled = !model.disabled
                        $0.surface = model.surface
                        $0.inputId = model.inputId
                        $0.value = model.value
                        $0.accessibilityLabel = model.accessibileText
                        $0.accessibilityValue = "item \(index+1) of \(selectorModels.count)"
                        $0.labelText = model.labelText
                        $0.labelTextAttributes = model.labelTextAttributes
                        $0.childText = model.childText
                        $0.childTextAttributes = model.childTextAttributes
                        $0.isSelected = model.selected
                        $0.errorText = model.errorText
                        $0.showError = model.showError
                    }
                }
            }
            setNeedsUpdate()
        }
    }

    private var _showError: Bool = false
    open var showError: Bool {
        get { _showError }
        set {
            var newShowError = newValue
            if selectedHandler != nil, newShowError {
                newShowError = false
            }
            selectorViews.forEach { handler in
                handler.showError = newShowError
            }
            _showError = newShowError
        }
    }
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    /// Called once when a view is initialized and is used to Setup additional UI or other constants and configurations.
    open override func setup() {
        super.setup()
        
        addSubview(mainStackView)
        
        mainStackView.pinToSuperView()
    }
    
    public override func didSelect(_ selectedControl: RadioButtonItem) {
        if let selectedHandler {
            updateToggle(selectedHandler)
        }
        updateToggle(selectedControl)
        if showError {
            showError = false
        }
        valueChanged()
    }
    
    private func updateToggle(_ radioButton: RadioButtonItem) {
        if radioButton.showError && radioButton.isSelected == false {
            radioButton.showError.toggle()
        }
        radioButton.isSelected.toggle()
    }
}

extension RadioButtonGroup {
    public struct RadioButtonItemModel: Surfaceable, Initable, FormFieldable, Errorable {
       
        /// Whether this object is disabled or not
        public var disabled: Bool
        /// Current Surface and this is used to pass down to child objects that implement Surfacable
        public var surface: Surface
        public var inputId: String?
        public var value: AnyHashable?
        public var accessibileText: String?
        public var labelText: String?
        /// Array of LabelAttributeModel objects used in rendering the labelText.
        public var labelTextAttributes: [any LabelAttributeModel]?
        public var childText: String?
        /// Array of LabelAttributeModel objects used in rendering the childText. 
        public var childTextAttributes: [any LabelAttributeModel]?
        public var selected: Bool
        public var showError: Bool
        public var errorText: String?
        
        public init(disabled: Bool, surface: Surface = .light, inputId: String? = nil, value: AnyHashable? = nil, accessibileText: String? = nil, labelText: String? = nil, labelTextAttributes: [any LabelAttributeModel]? = nil, childText: String? = nil, childTextAttributes: [any LabelAttributeModel]? = nil, selected: Bool = false, showError: Bool = false, errorText: String? = nil) {
            self.disabled = disabled
            self.surface = surface
            self.inputId = inputId
            self.value = value
            self.accessibileText = accessibileText
            self.labelText = labelText
            self.labelTextAttributes = labelTextAttributes
            self.childText = childText
            self.childTextAttributes = childTextAttributes
            self.selected = selected
            self.showError = showError
            self.errorText = errorText
        }
        
        public init() {
            self.init(disabled: false)
        }
    }
}