//
//  PreviewViewControllerProvider.swift
//  Tusker
//
//  Created by Shadowfacts on 10/10/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit

enum PreviewCommitType {
    case nav
    case modal
}

protocol PreviewViewControllerProvider {
    
    func getPreviewViewController(forLocation location: CGPoint, sourceViewController: UIViewController) -> UIViewController?
    
    func getPreviewCommitType(forViewController viewController: UIViewController) -> PreviewCommitType
    
}

extension PreviewViewControllerProvider {
    func getPreviewCommitType(forViewController viewController: UIViewController) -> PreviewCommitType {
        return viewController is LargeImageViewController ? .modal : .nav
    }
}

@objc extension UITableViewController: UIViewControllerPreviewingDelegate {
    public func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
        if let indexPath = tableView.indexPathForRow(at: location),
            let cell = tableView.cellForRow(at: indexPath) as? UITableViewCell & PreviewViewControllerProvider {
            let cellLocation = cell.convert(location, from: tableView)
            if let vc = cell.getPreviewViewController(forLocation: cellLocation, sourceViewController: self) {
                previewingContext.sourceRect = tableView.rectForRow(at: indexPath)
                return vc
            }
        }
        return nil
    }
    
    public func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
        if viewControllerToCommit is LargeImageViewController {
            present(viewControllerToCommit, animated: false)
        } else {
            navigationController!.pushViewController(viewControllerToCommit, animated: false)
        }
    }
}

//class PreviewingController: NSObject, UIViewControllerPreviewingDelegate {
//
//    var currentCommitType: PreviewCommitType?
//    var owner: UIViewController?
//
//    init(owner: UIViewController) {
//        self.owner = owner
//    }
//
//    func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
//        if let owner = owner as? UITableViewController,
//            let indexPath = owner.tableView.indexPathForRow(at: location),
//            let cell = owner.tableView.cellForRow(at: indexPath) as? UITableViewCell & PreviewViewControllerProvider {
//            let cellLocation = cell.convert(location, from: owner.tableView)
//            if let vc = cell.getPreviewViewController(forLocation: cellLocation, sourceViewController: owner) {
//                currentCommitType = cell.getPreviewCommitType(forViewController: vc)
//                previewingContext.sourceRect = owner.tableView.rectForRow(at: indexPath)
//                return vc
//            }
//        }
//        return nil
//    }
//
//    func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
//        switch currentCommitType ?? .nav {
//        case .modal:
//            owner?.present(viewControllerToCommit, animated: false)
//        case .nav:
//            owner?.navigationController!.pushViewController(viewControllerToCommit, animated: false)
//        }
//    }
//
//}