import UIKit


class ArticleDetailCollectionViewController: UICollectionViewController {


    private let reuseIdentifier = "Cell"
    private let headerIdentifier = "Header"
    var articles:[Article]
    var titleTxt = ""
    var contentTxt = ""
    var descriptionTxt = "bla"
    var urlFromJSON = ""

  // private var detailCollectionView:UICollectionView?


   /* private lazy var detailsCollectionView:UICollectionView = {
        let detailsCollectionView = UICollectionView()
        return detailsCollectionView
    }()*/

    init(articles:[Article]) {
        self.articles = articles
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }


    //MARK: - ViewController LifeCycle
    override func viewDidLoad() {
        super.viewDidLoad()
        configureCollectionView()

        view.backgroundColor = .red


    }

    func configureCollectionView() {
        let layout = UICollectionViewFlowLayout()
        layout.scrollDirection = .vertical
        layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
              layout.itemSize = CGSize(width: 111, height: 111)
       // detailCollectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.register(ArticleDetailCollectionViewCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        collectionView.register(ArticleDetailHeader.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: headerIdentifier)
        collectionView.backgroundColor = .yellow
     /*   guard let collectionView = detailCollectionView else {
            return
        }*/
     //   view.addSubview(collectionView)
    }
}

//MARK: - Extensions
extension ArticleDetailCollectionViewController {
    // MARK: UICollectionViewDataSource
    override func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 2
    }

    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 3
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! ArticleDetailCollectionViewCell
        return cell
    }
}

extension ArticleDetailCollectionViewController {
    override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
        let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerIdentifier, for: indexPath) as! ArticleDetailHeader
        return header
    }
}

extension ArticleDetailCollectionViewController: UICollectionViewDelegateFlowLayout {

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
        return CGSize(width: view.frame.width, height: 300)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath:IndexPath) -> CGSize {
        return CGSize(width: view.frame.width, height: 120)
       }

    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
    }
}
/*extension ArticleDetailCollectionViewController: UICollectionViewDelegateFlowLayout {
    private func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
           return CGSize(width: 50, height: 50)
       }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
           return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
       }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
           return 5.0
       }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
           return 5.0
       }
}*/