import UIKit
import Photos
import PhotosUI

struct Video {
    private(set) var videoUrl: URL?
    private(set) var thumbnail: UIImage?
    private init () {}
    init(videoUrl: URL?) {
        self.videoUrl = videoUrl
        guard let url = videoUrl else { return }
        self.thumbnail = generateThumbnail(from: url)
    }
}

class ArtistProfileVC: HubbleBaseVC {
    lazy var allVideos: [Video] = [] {
        didSet {
            videoCollection.reloadData()
        }
    }
}

// MARK: - PHPickerViewControllerDelegate
extension ArtistProfileVC: PHPickerViewControllerDelegate {
// for opening video picker
func openPHPicker(selectionLimit: Int, tag: Int) {
        var phpConfig = PHPickerConfiguration()
        phpConfig.selectionLimit = selectionLimit
        phpConfig.filter = .any(of: [.videos, .slomoVideos, .timelapseVideos])
        let phPickerVC = PHPickerViewController(configuration: phpConfig)
        phPickerVC.delegate = self
        self.navigationController?.present(phPickerVC, animated: true)
    }

    func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
        portfolioVideosSelected(results: results)
    }

    func portfolioVideosSelected(results: [PHPickerResult]) {
        self.dismiss(animated: true)
        results.forEach { result in
            result.itemProvider.loadFileRepresentation(forTypeIdentifier: UTType.movie.identifier) { url, error in
                guard let url = url, error == nil else { return }
                dump(url.absoluteURL)
                DispatchQueue.main.async {
                    self.allVideos.append(.init(videoUrl: url))
                }
            }
        }
    }
}

//-----------------------------------------------------------------------------------------
import AVFoundation
import UIKit
// MARK: - Using this for Generating Thumbnail.
func generateThumbnail(from videoUrl: URL) -> UIImage? {
    let asset = AVAsset(url: videoUrl)
    let imageGenerator = AVAssetImageGenerator(asset: asset)
    imageGenerator.appliesPreferredTrackTransform = true
    let time = CMTime(seconds: 1, preferredTimescale: 1)
    do {
        let imageRef = try imageGenerator.copyCGImage(at: time, actualTime: nil)
        return UIImage(cgImage: imageRef)
    } catch {
        print(error.localizedDescription)
        return nil
    }
}

// --------------------------------------------------------------------------------------------------------

For playing video am using AVKit

func playVideo(url: URL) {
    let player = AVPlayer(url: url)
    let vc = AVPlayerViewController()
    vc.player = player
    self.present(vc, animated: true) {
        vc.player?.play()
    }
}