//
//  Control.swift
//  VDS
//
//  Created by Matt Bruce on 7/22/22.
//

import Foundation
import UIKit
import Combine

@objc(VDSView)
/// Base Class used to build Views.
open class View: UIView, ViewProtocol, UserInfoable {
    
    //--------------------------------------------------
    // MARK: - Combine Properties
    //--------------------------------------------------
    /// Set of Subscribers for any Publishers for this Control.
    open var subscribers = Set<AnyCancellable>()
    
    //--------------------------------------------------
    // MARK: - Properties
    //--------------------------------------------------
    private var initialSetupPerformed = false
    
    /// Key of whether or not updateView() is called in setNeedsUpdate()
    open var shouldUpdateView: Bool = true
    
    /// Dictionary for keeping information for this Control use only Primitives.
    open var userInfo = [String: Primitive]()
    
    /// Current Surface and this is used to pass down to child objects that implement Surfacable
    open var surface: Surface = .light { didSet { setNeedsUpdate() } }
    
    /// Whether this object is disabled or not.
    open var disabled: Bool {
        get { !isEnabled }
        set {
            if !isEnabled != newValue {
                isEnabled = !newValue
            }
        }
    }
    
    /// Whether the View is enabled or not.
    open var isEnabled: Bool = true { didSet { setNeedsUpdate(); isUserInteractionEnabled = isEnabled } }
    
    //--------------------------------------------------
    // MARK: - Initializers
    //--------------------------------------------------
    required public init() {
        super.init(frame: .zero)
        initialSetup()
    }

    public override init(frame: CGRect) {
        super.init(frame: .zero)
        initialSetup()
    }
    
    public required init?(coder: NSCoder) {
        super.init(coder: coder)
        initialSetup()
    }
    
    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------
    
    /// Executed on initialization for this View.
    open func initialSetup() {
        if !initialSetupPerformed {
            initialSetupPerformed = true
            setup()
            setNeedsUpdate()
       }
    }
    
    /// Will be called only once and should be overridden in subclasses to setup UI or defaults.
    open func setup() {
        backgroundColor = .clear
        translatesAutoresizingMaskIntoConstraints = false
        insetsLayoutMarginsFromSafeArea = false
    }
    
    /// Function used to make changes to the View based off a change events or from local properties..
    open func updateView() {
    }
    
    /// Used to update any Accessibility properties.
    open func updateAccessibility() {
        if isEnabled {
            accessibilityTraits.remove(.notEnabled)
        } else {
            accessibilityTraits.insert(.notEnabled)
        }
    }
        
    /// Resets to default settings.
    open func reset() {
        backgroundColor = .clear
        surface = .light
        disabled = false
    }
    
}