import UIKit

final class ReusableCollectionViewDataSource<T, V>: NSObject,
UICollectionViewDataSource where V: ReusableCollectionViewCell<T> {

    typealias ConfigureCell = (T, V) -> Void

    var models: [T]

    private let configureCell: ConfigureCell

    init(models: [T], cellConfigurator: @escaping ConfigureCell) {
        self.models = models
        self.configureCell = cellConfigurator
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return models.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell: V = collectionView.dequeue(for: indexPath)
        let model = models[indexPath.row]
        configureCell(model, cell)
        return cell
    }
}

class ReusableCollectionViewCell<V>: UICollectionViewCell {
    var model: V?
}

/* private var dataSource: ReusableCollectionViewDataSource<Model, Cell>?

self?.dataSource = ReusableCollectionViewDataSource(models: data) { model, cell in
     cell.model = model
}

self?.collectionView.dataSource = self?.dataSource