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import SwiftUI
import UIKit

struct PageControl: UIViewRepresentable {
    var numberOfPages: Int
    @Binding var currentPage: Int
    
    func makeUIView(context: Context) -> UIPageControl {
        let control = UIPageControl()
        control.numberOfPages = numberOfPages
        control.addTarget(
            context.coordinator,
            action: #selector(Coordinator.updateCurrentPage(sender:)),
            for: .valueChanged)
        return control
    }
    
    func updateUIView(_ uiView: UIPageControl, context: Context) {
        uiView.currentPage = currentPage
    }
    
    class Coordinator: NSObject {
        init(_ control: PageControl) {
            self.control = control
        }
        
        var control: PageControl
        
        @objc func updateCurrentPage(sender: UIPageControl) {
            control.currentPage = sender.currentPage
        }
        
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
}

import SwiftUI

struct PageView<Page: View>: View {
    @State var currentPage: Int = 0
    var viewControllers: [UIHostingController<Page>]
    
    init(_ views: [Page]) {
        self.viewControllers = views.map { UIHostingController(rootView: $0) }
    }
    
    var body: some View {
        ZStack(alignment: .bottomTrailing) {
            PageViewController(controllers: viewControllers, currentPage: $currentPage)
            PageControl(numberOfPages: viewControllers.count, currentPage: $currentPage)
                .padding(.trailing)
        }
    }
}

struct PageView_Preview: PreviewProvider {
    static var previews: some View {
        PageView(features.map { FeatureCard(landmark: $0) })
            .aspectRatio(3/2, contentMode: .fit)
    }
}

import SwiftUI
import UIKit

struct PageViewController: UIViewControllerRepresentable {
    var controllers: [UIViewController]
    @Binding var currentPage: Int
    
    func makeUIViewController(context: Context) -> UIPageViewController {
        let pageViewController = UIPageViewController(
            transitionStyle: .scroll,
            navigationOrientation: .horizontal
        )
        pageViewController.dataSource = context.coordinator
        pageViewController.delegate = context.coordinator
        return pageViewController
    }
    
    func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) {
        pageViewController.setViewControllers(
            [controllers[currentPage]], direction: .forward, animated: true
        )
    }
    
    //MARK: Coordinator
    class Coordinator: NSObject, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
        var parent: PageViewController
        
        init(_ pageViewController: PageViewController) {
            self.parent = pageViewController
        }
        
        func pageViewController( _ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
            guard let index = parent.controllers.firstIndex(of: viewController) else {
               return nil
            }
            if index == 0 {
               //return parent.controllers.last
                return nil
            }
            return parent.controllers[index - 1]
        }

       func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
           guard let index = parent.controllers.firstIndex(of: viewController) else {
               return nil
           }
           if index + 1 == parent.controllers.count {
               //return parent.controllers.first
                return nil
           }
           return parent.controllers[index + 1]
       }
        
        
        func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
            if completed,
                let visibleViewController = pageViewController.viewControllers?.first,
                let index = parent.controllers.firstIndex(of: visibleViewController)
            {
                parent.currentPage = index
            }
        }
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
}