//
//  SelectorBase.swift
//  VDS
//
//  Created by Matt Bruce on 6/5/23.
//

import Foundation
import Combine
import VDSColorTokens
import VDSFormControlsTokens

public protocol SelectorControlable: Control, Changeable {
    var showError: Bool { get set }
    var size: CGSize { get set }
    var backgroundColorConfiguration: ControlColorConfiguration { get set }
    var borderColorConfiguration: ControlColorConfiguration { get set }
    var selectorColorConfiguration: ControlColorConfiguration { get set }
}

open class SelectorBase: Control, SelectorControlable {
    public var onChangeSubscriber: AnyCancellable? {
        willSet {
            if let onChangeSubscriber {
                onChangeSubscriber.cancel()
            }
        }
    }

    open var size = CGSize(width: 20, height: 20) { didSet { setNeedsUpdate() }}

    var _showError: Bool = false
    open var showError: Bool {
        get { _showError }
        set {
            if !isSelected && _showError != newValue {
                _showError = newValue
                setNeedsUpdate()
            }
        }
    }
    
    open override var state: UIControl.State {
        get {
            var state = super.state
            if showError {
                state.insert(.error)
            } else {
                state.remove(.error)
            }
            return state
        }
    }

    open var backgroundColorConfiguration = ControlColorConfiguration() { didSet { setNeedsUpdate() }}

    open var borderColorConfiguration = ControlColorConfiguration() { didSet { setNeedsUpdate() }}

    open var selectorColorConfiguration = ControlColorConfiguration() { didSet { setNeedsUpdate() }}    

    private var selectorView = View()
    //--------------------------------------------------
    // MARK: - Constraints
    //--------------------------------------------------
    internal var shapeLayer: CAShapeLayer?

    open override func initialSetup() {
        super.initialSetup()
        onClick = { control in
            control.toggle()
        }
    }

    open override func setup() {
        super.setup()
        
        isAccessibilityElement = true
        accessibilityTraits = .button
    }
    
    open override var intrinsicContentSize: CGSize { size }
    
    open func toggle() { }
    
    open override func updateView() {
        super.updateView()
        setNeedsLayout()
        layoutIfNeeded()
    }
    
    open override func updateAccessibility() {
        super.updateAccessibility()
        accessibilityValue = isSelected ? "1" : "0"
    }
}