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

import Foundation
import UIKit

public protocol SelectorGroup: Modelable {
    associatedtype SelectorType: SelectorModel
    var models: [SelectorType] { get set }
}

public struct RadioButtonGroupModel: SelectorGroup, FormFieldable{
    public var inputId: String?
    public var value: AnyHashable?
    public var surface: Surface = .light
    public var disabled: Bool = false
    public var models: [DefaultRadioButtonModel]
    public init() { models = [] }
    public init(models: [DefaultRadioButtonModel]){
        self.models = models
    }
}

public class RadioButtonGroup: View<RadioButtonGroupModel>, Changable {
   
    public var radioButtons: [RadioButton] = []
    public var selectedView: RadioButton?
    public var onChange: Blocks.ActionBlock?

    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var mainStackView: UIStackView = {
       let stackView = UIStackView()
        stackView.translatesAutoresizingMaskIntoConstraints = false
        stackView.alignment = .top
        stackView.axis = .vertical
        stackView.spacing = 10
        return stackView
    }()
    
    //--------------------------------------------------
    // MARK: - Overrides
    //--------------------------------------------------
    override public var disabled: Bool {
        didSet {
            let models = model.models.compactMap { existing in
                return updated(existing){
                    $0.disabled = disabled
                }
            }
            model.models = models
        }
    }
    
    override public var surface: Surface {
        didSet {
            let models = model.models.compactMap { existing in
                return updated(existing){
                    $0.surface = surface
                }
            }
            model.models = models
        }
    }
        
    open override func setup() {
        super.setup()

        isAccessibilityElement = true
        accessibilityTraits = .button
        addSubview(mainStackView)
        
        mainStackView.topAnchor.constraint(equalTo: topAnchor).isActive = true
        mainStackView.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
        mainStackView.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
        mainStackView.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
    }
    
    public override func onStateChange(viewModel: RadioButtonGroupModel) {
        super.onStateChange(viewModel: viewModel)
        
        for radioButtonModel in viewModel.models {
            let radioButton = radioButtons.first(where: { existingRadioButton in
                return existingRadioButton.model.inputId == radioButtonModel.inputId && radioButtonModel.inputId != nil
            })
            
            //found view
            if let radioButton = radioButton {
                radioButton.set(with: radioButtonModel)
            } else {
                //create view
                let newRadioButton = RadioButton(with: radioButtonModel)
                newRadioButton.selectorController = self
                self.radioButtons.append(newRadioButton)
                mainStackView.addArrangedSubview(newRadioButton)
            }
        }
    }
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    public convenience init() {
        self.init(with: ModelType())
    }
    
    required public init(with model: ModelType) {
        super.init(with: model)
    }
    
    required public init?(coder: NSCoder) {
        super.init(with: ModelType())
    }
    
    //--------------------------------------------------
    // MARK: - Delegate
    //--------------------------------------------------
    public func didSelect(selector: RadioButton) {
        selectedView?.isSelected = false
        selector.isSelected = true
        selectedView = selector
    }
}