Privado-iOS/iOS/Privado/Sources/Flows/NotificationsFlow/Module/ViewIPAD/NotificationsViewIPAD.swift

//
//  NotificationsViewFormIPAD.swift
//  OpenVPN
//
//  Created by Lizaveta Malinouskaya on 24.08.21.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import UIKit

protocol NotificationsControllerInputIPAD {
    func display(notificationCells: [NotificationCellAdapter])
}

class NotificationsViewIPAD: UIViewController, NotificationsControllerInput {
    
    // MARK: - Constant
    enum Constant {
        static let selfSize = CGSize(width: 305, height: 311)
        static let estimatedCellHeight: CGFloat = 1000
        static let tableViewTop: CGFloat = 44
        static let labelFont = UIFont.primary(size: 12, weight: .semibold)
        static let labelText = NSLocalizedString("notificationCenter.empty", comment: "There are currently no notifications.")
        static let labelWidth: CGFloat = 200
        static let cornerRadius: CGFloat = 10
    }
    // MARK: - Property
    public var navigationBar: NotificationsNavBarIPAD? {
        didSet {
            self.setupNavigationBar(with: self.view)
        }
    }
    public let output: NotificationNavBarOutput
    
    var notificationsTableView: UITableView?
    var notificationsTableViewManager: NotificationsTableViewManager?
    var notificationsEmptyLabel: UILabel?
    
    // MARK: - init
    
    public init(with output: NotificationNavBarOutput) {
        self.output = output
        super.init(nibName: nil, bundle: nil)
        self.setupUI()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewWillAppear(_ animated: Bool) {
        self.output.viewIsReady()
    }
    
    override func loadView() {
        let view = UIView(frame: .zero)
        view.autoresizesSubviews = true
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = Colors.Notification.bg.color
        view.layer.cornerRadius = 10
        self.view = view
    }
    
    // MARK: - NotificationsControllerInput
    
    func display(notificationCells: [NotificationCellAdapter]) {
        self.notificationsTableViewManager?.display(notificationCells: notificationCells)
        if notificationCells.isEmpty {
            self.notificationsTableView?.isHidden = true
            self.notificationsEmptyLabel?.isHidden = false
        } else {
            self.notificationsTableView?.isHidden = false
            self.notificationsEmptyLabel?.isHidden = true
        }
    }
    

    // MARK: - UI
    
    private func setupUI() {
        NSLayoutConstraint.activate([
            self.view.widthAnchor.constraint(equalToConstant: Constant.selfSize.width),
            self.view.heightAnchor.constraint(equalToConstant: Constant.selfSize.height)
        ])
        self.notificationsTableView = self.setupTableView(with: self.view)
        self.notificationsTableViewManager =  NotificationsTableViewManager(tableView: self.notificationsTableView!)
        self.notificationsEmptyLabel = self.setupEmptyLabel(with: self.view)
    }
    
    private func setupTableView(with container: UIView) -> UITableView {
        let tableView = UITableView()
        tableView.translatesAutoresizingMaskIntoConstraints = false
        tableView.separatorStyle = .none
        tableView.layer.cornerRadius = Constant.cornerRadius
        tableView.backgroundColor = .clear
        tableView.showsVerticalScrollIndicator = true
        tableView.estimatedRowHeight = Constant.estimatedCellHeight
        tableView.rowHeight = UITableView.automaticDimension
        tableView.indicatorStyle = .white
        if #available(iOS 11.1, *) {
            tableView.verticalScrollIndicatorInsets = .init(top: 22, left: 0, bottom: 0, right: 3)
        }
        container.addSubview(tableView)
        
        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: container.topAnchor, constant: Constant.tableViewTop),
            tableView.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: container.trailingAnchor),
            tableView.bottomAnchor.constraint(equalTo: container.bottomAnchor)
        ])
        return tableView
    }
    
    private func setupEmptyLabel(with container: UIView) -> UILabel {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.textColor = .white
        label.numberOfLines = 2
        label.textAlignment = .center
        label.font = Constant.labelFont
        label.text = Constant.labelText
        container.addSubview(label)
        
        NSLayoutConstraint.activate([
            label.widthAnchor.constraint(equalToConstant: Constant.labelWidth),
            label.centerXAnchor.constraint(equalTo: container.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: container.centerYAnchor)
        ])
        
        return label
    }
    private func setupNavigationBar(with container: UIView) {
        guard let navBar = self.navigationBar else { return }
        container.addSubview(navBar)
        
        NSLayoutConstraint.activate([
            navBar.heightAnchor.constraint(equalToConstant: 40),
            navBar.topAnchor.constraint(equalTo: container.topAnchor),
            navBar.leadingAnchor.constraint(equalTo: container.leadingAnchor),
            navBar.trailingAnchor.constraint(equalTo: container.trailingAnchor)
        ])
        
        navBar.setNeedsLayout()
        container.layoutSubviews()
    }
}