let cache = NSCache<AnyObject, AnyObject>()

extension UIImageView {
    func downloadImage(from url: URL?){
        guard let url else {
            return
        }
        if let image = cache.object(forKey: url.absoluteString as NSString) as? UIImage{
            self.image = image
            return
        }
        
        let session = URLSession(configuration: .default)
        let urlRequest = URLRequest(url: url)
        let task = session.dataTask(with: urlRequest) { data, response, error in
            if let error {
                fatalError(error.localizedDescription)
            }
            guard let data,let image = UIImage(data: data) else {
                return
            }
            
            DispatchQueue.main.async {
                self.image = image
            }
            cache.setObject(image, forKey: url.absoluteString as NSString)
        }
        task.resume()
    }
}

protocol BaseViewModel {
    associatedtype Model
    var data: Model? { get set }
    func fetchData(by id: Int?,completion: @escaping ((Result<Model?, Error>) -> Void ))
}

extension BaseViewModel {
    func fetchData(by id: Int?,completion: @escaping ((Result<Model?, Error>) -> Void )) {}
}

class BaseViewController<T: UIView>: UIViewController {
    // Properties
    let baseViewModel: any BaseViewModel
    
    var contentView: T {
        return view as! T
    }
    
    // Init
    init(viewModel: any BaseViewModel) {
        self.baseViewModel = viewModel
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // LifeCycle
    override func loadView() {
        view = T()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        //baseViewModel.delegate = self
    }
    
    // Methods
    func fetchData(id :Int? = nil) {
        fatalError("fetchData must be overridden")
    }
}

// MARK: - BaseViewModelDelegate
extension BaseViewController: BaseViewModelDelegate {
    func onDataUpdated() {
        fatalError("onDataUpdated must be overridden")
    }
}
protocol BaseViewModelDelegate: AnyObject {
    func onDataUpdated()
}

protocol CollectionViewDelegate: AnyObject,UICollectionViewDelegate,UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
}
protocol TableViewDelegate: AnyObject,UITableViewDelegate,UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
}

extension UIColor {
    convenience init(hex: String) {
        var cString: String = hex.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()
        
        if cString.hasPrefix("#") {
            cString.remove(at: cString.startIndex)
        }
        
        if (cString.count) != 6 {
            self.init(red: 0.5, green: 0.5, blue: 0.5, alpha: 1.0)
            return
        }
        
        var rgbValue: UInt64 = 0
        Scanner(string: cString).scanHexInt64(&rgbValue)
        
        self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
                  green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
                  blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
                  alpha: CGFloat(1.0))
    }
}