//
//  EmptyViewController.swift
//  PrivadoVPN
//
//  Created by Juraldinio on 7/30/20.
//  Copyright © 2020 Privado LLC. All rights reserved.
//

import Foundation
import AppKit

final class EmptyViewController: NSViewController {
    
    private enum Constants {
        static let imageBackground = "bg-graphic"
        static let imageDiff: CGFloat = 300
        static let loaderSize: CGFloat = 120.0
    }
    
    private lazy var loader = PrivadoLoader(frame: .zero, isButton: false)
    
    // MARK: - Lyfecycle
    
    override func loadView() {
        
        let view = NSView(frame: .zero)
        view.autoresizesSubviews = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.wantsLayer = true
        view.layer?.backgroundColor = NSColor(red: 21, green: 25, blue: 53).cgColor
        
        self.view = view
    }

    override func viewDidLoad() {
        
        super.viewDidLoad()
        
        self.configureUI()
    }
    
    override func viewDidAppear() {
        super.viewDidAppear()
        self.loader.startAnimation(clockwise: false)
    }
    
    // MARK: - UI
    
    private func configureUI() {
        
        self.view.viewBackgroundColor = NSColor(red: 80, green: 88, blue: 200)
        
        NSLayoutConstraint.activate([
            self.view.widthAnchor.constraint(equalToConstant: PrivadoConstants.Window.sizeWidth),
            self.view.heightAnchor.constraint(equalToConstant: PrivadoConstants.Window.sizeHeight)
        ])
        
        // Background image
        let image = NSImage(imageLiteralResourceName: Constants.imageBackground)
        let imageView = ImageView(image: image)
        imageView.imageScaling = .scaleNone
        self.view.addSubview(imageView)
        NSLayoutConstraint.activate([
            imageView.topAnchor.constraint(equalTo: self.view.topAnchor),
            imageView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
            imageView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
            imageView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor)
            ])
        
        self.loader.translatesAutoresizingMaskIntoConstraints = false
        self.loader.arcColor = NSColor(red: 132, green: 138, blue: 217)
        self.loader.keyholeColor = .white
        self.loader.arcWidth = 5
        self.view.addSubview(self.loader)
        
        NSLayoutConstraint.activate([
            self.loader.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
            self.loader.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
            self.loader.heightAnchor.constraint(equalToConstant: Constants.loaderSize),
            self.loader.widthAnchor.constraint(equalToConstant: Constants.loaderSize)
        ])
    }
}