Tusker/Packages/GalleryVC/Sources/GalleryVC/Content/FallbackGalleryContentViewController.swift

//
//  FallbackGalleryContentViewController.swift
//  GalleryVC
//
//  Created by Shadowfacts on 3/18/24.
//  Copyright © 2024 Shadowfacts. All rights reserved.
//

import UIKit
import QuickLook

private class FallbackGalleryContentViewController: QLPreviewController {
    private let previewItem = GalleryPreviewItem()
    
    init(url: URL) {
        super.init(nibName: nil, bundle: nil)
        
        self.previewItem.previewItemURL = url
        
        dataSource = self
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        overrideUserInterfaceStyle = .dark
        
        navigationItem.rightBarButtonItems = [
            UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(closePressed))
        ]
    }
    
    @objc private func closePressed() {
        self.dismiss(animated: true)
    }
    
}

extension FallbackGalleryContentViewController: QLPreviewControllerDataSource {
    func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
        1
    }
    
    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> any QLPreviewItem {
        previewItem
    }
}

public class FallbackGalleryNavigationController: UINavigationController, GalleryContentViewController {
    public init(url: URL) {
        super.init(nibName: nil, bundle: nil)
        self.viewControllers = [FallbackGalleryContentViewController(url: url)]
    }
    
    public override func viewDidLoad() {
        super.viewDidLoad()
        
        container?.disableGalleryScrollAndZoom()
    }
    
    public required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: GalleryContentViewController
    
    public weak var container: (any GalleryContentViewControllerContainer)?
    
    public var contentSize: CGSize {
        .zero
    }
    
    public var activityItemsForSharing: [Any] {
        []
    }
    
    public var caption: String? {
        nil
    }
    
    public var presentationAnimation: GalleryContentPresentationAnimation {
        .fade
    }
}

private class GalleryPreviewItem: NSObject, QLPreviewItem {
    var previewItemURL: URL? = nil
}