vds_ios/VDS/Components/RadioButton/RadioButtonGroup.swift

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

import Foundation
import UIKit

/// Radio buttons items are single-select components through which a customer indicates a choice.
/// They must always be paired with one or more other ``RadioButtonItem`` within  a radio button group.
/// Use radio buttons to display choices like delivery method.
@objc(VDSRadioButtonGroup)
open class RadioButtonGroup: SelectorGroupBase<RadioButtonItem>, SelectorGroupSingleSelect {
    
    //--------------------------------------------------
    // 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: - Public Properties
    //--------------------------------------------------
    /// Array of ``RadioButtonItemModel`` that will be used to build the selectorViews of type ``RadioButtonItem``.
    open var selectorModels: [RadioButtonItemModel]? {
        didSet {
            if let selectorModels {
                items = 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
    
    /// Whether not to show the error.
    open var showError: Bool {
        get { _showError }
        set {
            var newShowError = newValue
            if hasSelectedItem && newShowError {
                newShowError = false
            }
            items.forEach { $0.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 selectedItem {
            updateToggle(selectedItem)
        }
        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)
        }
    }
}