BooksCollectionViewController

BooksCollectionViewController.swift

class BooksCollectionViewController: UIViewController {

    @IBOutlet var collectionView: UICollectionView!

    var booksCollectionInterfaceProvider: BooksCollectionInterfaceProvider!
    var booksCollectionDataProvider: BaseBooksCollectionDataProvider! {
        didSet {
            title = booksCollectionDataProvider.title
            if booksCollectionDataProvider.datasource.isEmpty {
                booksCollectionDataProvider.loadData(paginationDelegate: self.paginationDelegate)
            }
        }
    }

    var _paginationDelegate = PaginationDelegate()

    override func viewDidLoad() {
        super.viewDidLoad()

        booksCollectionInterfaceProvider = BooksCollectionInterfaceProvider(parentController: self,
                                                                            collectionView: collectionView)
        booksCollectionInterfaceProvider.delegate = self

        if !booksCollectionDataProvider.datasource.isEmpty {
            booksCollectionInterfaceProvider.datasource = booksCollectionDataProvider.datasource
            self.paginationDelegate.offset = 0
            self.paginationDelegate.limit = booksCollectionDataProvider.datasource.count
        }

        store.subscribe(self) {
            $0.select{ $0.usersState }
        }
    }
}

extension BooksCollectionViewController: BooksCollectionInterfaceProviderDelegate {
    func booksCollectionInterfaceProviderCollectionView(collectionView: UICollectionView,
                                                        layout collectionViewLayout: UICollectionViewLayout,
                                                        referenceSizeForHeaderInSection section: Int) -> CGSize {
        return CGSize.zero
    }

    func booksCollectionInterfaceProviderCollectionView(collectionView: UICollectionView,
                                                        viewForSupplementaryElementOfKind kind: String,
                                                        at indexPath: IndexPath) -> UICollectionReusableView {
        return UICollectionReusableView()
    }

    func booksCollectionInterfaceProviderScrollViewDidScroll(scrollView: UIScrollView) {

    }

    func booksCollectionInterfaceProviderDidChangeDisplayMode(provider: BooksCollectionInterfaceProvider,
                                                              displayMode:)
    }
}

extension BooksCollectionViewController: StoreSubscriber {

    func newState(state: UsersState) {
        DispatchQueue.main.async {
            self.booksCollectionInterfaceProvider.datasource = self.booksCollectionDataProvider.datasource
        }
    }
}

extension BooksCollectionViewController: PaginatedScrollView {
    var paginationDelegate: PaginationDelegate {
        return _paginationDelegate
    }

    func paginationShouldLoad(offset: Int, limit: Int) {
        booksCollectionDataProvider.loadData(paginationDelegate: self.paginationDelegate)
    }
}