//
//  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() }}    

    //--------------------------------------------------
    // MARK: - Constraints
    //--------------------------------------------------
    private var selectorHeightConstraint: NSLayoutConstraint?
    private var selectorWidthConstraint: NSLayoutConstraint?
    
    internal var shapeLayer: CAShapeLayer?

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

    open override func setup() {
        super.setup()
        let layoutGuide = UILayoutGuide()
        addLayoutGuide(layoutGuide)
        
        selectorHeightConstraint = layoutGuide.heightAnchor.constraint(equalToConstant: size.height)
        selectorHeightConstraint?.isActive = true
        
        selectorWidthConstraint = layoutGuide.widthAnchor.constraint(equalToConstant: size.width)
        selectorWidthConstraint?.isActive = true
        
        NSLayoutConstraint.activate([
            layoutGuide.topAnchor.constraint(equalTo: topAnchor),
            layoutGuide.bottomAnchor.constraint(equalTo: bottomAnchor),
            layoutGuide.leadingAnchor.constraint(equalTo: leadingAnchor),
            layoutGuide.trailingAnchor.constraint(equalTo: trailingAnchor)])
    
        layer.cornerRadius = 2.0
        layer.borderWidth = VDSFormControls.widthBorder
        
    }
    
    open func toggle() { }
    
    open override func updateView() {
        super.updateView()
                
        selectorHeightConstraint?.constant = size.height
        selectorWidthConstraint?.constant = size.width

        setNeedsLayout()
        layoutIfNeeded()
    }
    
}