//
//  LoaderViewController.swift
//  VDS
//
//  Created by Matt Bruce on 7/5/23.
//

import Foundation
import UIKit
import VDSCoreTokens

/// ViewController to show the Loader, this will be presented using the LoaderLaunchable Protocl.
@objcMembers
@objc(VDSLoaderViewController)
open class LoaderViewController: UIViewController, Surfaceable {
    //--------------------------------------------------
    // MARK: - Private Properties
    //--------------------------------------------------
    private var loader = Loader()
    private var backgroundColorConfiguration = SurfaceColorConfiguration(VDSColor.backgroundPrimaryLight, VDSColor.backgroundPrimaryDark)
    
    //--------------------------------------------------
    // MARK: - Public Properties
    //--------------------------------------------------
    /// Current Surface and this is used to pass down to child objects that implement Surfacable  
    open var surface: Surface = .light { didSet { updateView() }}
    
    /// Size of the Height and Width of the Loader view.
    open var size: Int? { didSet { updateView() }}
    
    //--------------------------------------------------
    // MARK: - Lifecycle
    //--------------------------------------------------
    open override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(loader)
        NSLayoutConstraint.activate([
            loader.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            loader.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        ])
    }
    
    open override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        updateView()
    }
    
    /// Used to make changes to the View based off a change events or from local properties.
    open func updateView() {
        view.backgroundColor = backgroundColorConfiguration.getColor(self).withAlphaComponent(0.8)
        if let size {
            loader.size = size
        }
        loader.surface = surface
    }
}