private class TopChatsCell: UITableViewCell {

    override public func layoutSubviews() {
       super.layoutSubviews()
       if let frameWidth = self.imageView?.frame.width {
           self.imageView?.layer.cornerRadius = frameWidth / 2.0
           self.imageView?.clipsToBounds = true
       }
    }
}


final class TopChatsController: UIViewController, UITableViewDelegate, UITableViewDataSource
{

    private let context: AccountContext

    var rootNavigationController: NavigationController?
    var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    var dismiss: (() -> Void)?
    var imageLoader: ImageCacheLoader

    public var pushControllerImpl: ((ViewController) -> Void)?

    var tableView: UITableView = UITableView()
    var topChats: [TopChat] = []
    let cellReuseIdentifier = "TopChatsCell"


    public init(context: AccountContext) {
        self.context = context
        self.presentationData = self.context.sharedContext.currentPresentationData.with { $0 }
        self.imageLoader = ImageCacheLoader()

        super.init(nibName: nil, bundle: nil)

        self.presentationDataDisposable = (context.sharedContext.presentationData
            |> deliverOnMainQueue).start(next: { [weak self] presentationData in
                if let strongSelf = self {
                    let previousTheme = strongSelf.presentationData.theme
                    let previousStrings = strongSelf.presentationData.strings

                    strongSelf.presentationData = presentationData

                    if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                        strongSelf.updateThemeAndStrings()
                    }
                }
            })

        // Load all data at once
        URLSession(configuration: URLSessionConfiguration.default).dataTask(with: URL(string: JSON_URL)!) { data, response, error in
            // ensure there is data returned from this HTTP response
            guard let data = data else {
                print("No data")
                return
            }

            // Parse JSON into Post array struct using JSONDecoder
            guard let parsedTopChats = try? JSONDecoder().decode([TopChat].self, from: data) else {
                print("Error: Couldn't decode data into topchats model")
                return
            }

            self.topChats = parsedTopChats

            // Make sure to update UI in main thread
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        }.resume()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override public func viewDidLoad()
    {
        super.viewDidLoad()

        tableView.register(TopChatsCell.self, forCellReuseIdentifier: cellReuseIdentifier)


        self.view.addSubview(self.tableView)
        self.tableView.frame = self.view.bounds
        self.tableView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        self.tableView.dataSource = self
        self.tableView.delegate = self
        self.tableView.backgroundColor = self.presentationData.theme.chatList.pinnedItemBackgroundColor
        self.tableView.separatorColor = self.presentationData.theme.chatList.itemSeparatorColor
    }

    override public func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print("APPEAR TABLEVIEW")
        self.getNavigationController()
    }

    public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return topChats.count
    }

    public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell: TopChatsCell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifier) as! TopChatsCell

        let topChat = topChats[indexPath.row]

        cell.textLabel?.text = topChat.title
        cell.textLabel?.textColor = self.presentationData.theme.chatList.titleColor
        cell.backgroundColor = self.presentationData.theme.chatList.pinnedItemBackgroundColor
        let view = UIView()
        view.backgroundColor = self.presentationData.theme.chatList.itemSelectedBackgroundColor
        cell.selectedBackgroundView = view

        imageLoader.obtainImageWithPath(imagePath: AVATAR_URL + topChat.image) { (image) in
            // Before assigning the image, check whether the current cell is visible
            if let updateCell = tableView.cellForRow(at: indexPath) as? TopChatsCell {
                updateCell.imageView?.image = image
                updateCell.layoutIfNeeded()
            }
        }

        return cell
    }