//
//  NotificationsBellModuleViewIPAD.swift
//  PrivadoVPN
//
//  Created by Zhandos Bolatbekov on 08.07.2021.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import UIKit

final class NotificationsBellModuleViewIPAD: UIButton, NotificationsBellViewInput {
    
    private enum Constants {
        
        enum ImageName {
            static let highlightedBell = "notificationBell.light.ipad"
            static let bell = "notificationBell.ipad"
        }
        
        enum Color {
            static let badgeFill = UIColor(rgb: 0xFF0000)
        }
        
        enum Geometry {
            static let badgeSize: CGFloat = 7.5
            static let badgeTop: CGFloat = 7.51
            static let badgeTrailing: CGFloat = 9.41
            static let bellSize: CGFloat = 34
        }
    }
    
    var output: NotificationsBellModuleOutput
    
    private var bellImageView: UIImageView?
    private var badgeView: UIView?
    
    // MARK: - Init
    
    init(output: NotificationsBellModuleOutput) {
        self.output = output
        super.init(frame: .zero)
        self.configureUI()
        self.addTarget(self, action: #selector(self.notificationsButtonClick), for: .touchUpInside)
    }
    
    required init?(coder: NSCoder) { nil }
    
    override func didMoveToSuperview() {
        super.didMoveToSuperview()
        self.output.viewIsReady()
    }
    
    // MARK: - NotificationsBellViewInput
    
    func showBadge(_ show: Bool) {
        self.badgeView?.isHidden = !show
    }
    
    func set(highlighted: Bool) {
        self.bellImageView?.image = UIImage(named: highlighted ? Constants.ImageName.highlightedBell : Constants.ImageName.bell)
    }
    
    // MARK: - Private
    
    private func configureUI() {
        self.translatesAutoresizingMaskIntoConstraints = false
        
        let bellImageView = self.initializeBell()
        NSLayoutConstraint.activate([
            bellImageView.heightAnchor.constraint(equalToConstant: Constants.Geometry.bellSize),
            bellImageView.widthAnchor.constraint(equalToConstant: Constants.Geometry.bellSize),
            bellImageView.centerXAnchor.constraint(equalTo: self.centerXAnchor),
            bellImageView.centerYAnchor.constraint(equalTo: self.centerYAnchor)
        ])
        
        let badgeView = self.initializeBadge()
        NSLayoutConstraint.activate([
            badgeView.topAnchor.constraint(equalTo: bellImageView.topAnchor, constant: Constants.Geometry.badgeTop),
            badgeView.rightAnchor.constraint(equalTo: bellImageView.rightAnchor, constant: -Constants.Geometry.badgeTrailing),
            badgeView.heightAnchor.constraint(equalToConstant: Constants.Geometry.badgeSize),
            badgeView.widthAnchor.constraint(equalToConstant: Constants.Geometry.badgeSize)
        ])
    }
    
    private func initializeBell() -> UIImageView {
        let bellImage = UIImage(named: Constants.ImageName.bell)
        let bellImageView = UIImageView(image: bellImage)
        bellImageView.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(bellImageView)
        self.bellImageView = bellImageView
        return bellImageView
    }
    
    private func initializeBadge() -> UIView {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.layer.cornerRadius = Constants.Geometry.badgeSize / 2
        view.layer.backgroundColor = Constants.Color.badgeFill.cgColor
        view.clipsToBounds = true
        view.isHidden = true
        self.addSubview(view)
        self.badgeView = view
        return view
    }
    
    @objc
    private func notificationsButtonClick() {
        self.output.openNotificationsList()
    }
}