import UIKit

class RootController: UIViewController {
    var pages: [UIViewController] {
        let firstController = UIViewController()
        firstController.view.backgroundColor = UIColor.redColor()

        let secondController = UIViewController()
        secondController.view.backgroundColor = UIColor.greenColor()

        let thirdController = UIViewController()
        thirdController.view.backgroundColor = UIColor.purpleColor()

        return [firstController, secondController, thirdController]
    }

    lazy var scrollView: PaginatedScrollView = {
        let view = PaginatedScrollView(frame: view.frame, parentController: self, initialPage: 0)
        view.viewDataSource = self

        return view
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(scrollView)
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()

        scrollView.configure()
    }
}

extension RootController: PaginatedScrollViewDataSource {
    func numberOfPagesInPaginatedScrollView(paginatedScrollView: PaginatedScrollView) -> Int {
        return pages.count
    }

    func paginatedScrollView(paginatedScrollView: PaginatedScrollView, controllerAtIndex index: Int) -> UIViewController {
        return pages[index]
    }
}

protocol PaginatedScrollViewDelegate: class {
    func paginatedScrollView(paginatedScrollView: PaginatedScrollView, didMoveToIndex index: Int)
    func paginatedScrollView(paginatedScrollView: PaginatedScrollView, didMoveFromIndex index: Int)
}