//
//  ELStatusTableViewController.swift
//  elpha-ios
//
//  Created by Dwayne Harris on 11/9/18.
//  Copyright © 2018 Elpha. All rights reserved.
//

import AVKit
import CoreData
import UIKit
import SafariServices

protocol AbstractStatusTableViewCell {
    var statusView: StatusView! { get set }
}

class AbstractStatusTableViewController: UITableViewController, StatusViewDelegate {
    let fetchLimit = 20
    var fetchedResultsController: NSFetchedResultsController<StatusMO>?
    
    var loading: Bool = false {
        didSet {
            DispatchQueue.main.async {
                if self.loading {
                    self.refreshControl?.beginRefreshing()
                } else {
                    self.refreshControl?.endRefreshing()
                }
            }
        }
    }
    
    var currentPaginationContext: String {
        get {
            return ""
        }
    }
    
    func storyboard() -> UIStoryboard {
        return UIStoryboard(name: "Main", bundle: nil)
    }
    
    func accountTapped(_ sender: Any, account: AccountMO) {
        if let controller = storyboard().instantiateViewController(withIdentifier: "AccountTableViewController") as? AccountTableViewController {
            controller.account = account
            self.navigationController?.pushViewController(controller, animated: true)
        }
    }
    
    func statusTapped(_ sender: Any, status: StatusMO) {
        if let controller = storyboard().instantiateViewController(withIdentifier: "StatusTableViewController") as? StatusTableViewController {
            controller.status = status
            self.navigationController?.pushViewController(controller, animated: true)
        }
    }
    
    func loadMoreTapped(_ sender: Any, status: StatusMO, direction: PaginationDirection) {

    }
    
    func replyTapped(_ sender: Any, status: StatusMO) {
        if let controller = storyboard().instantiateViewController(withIdentifier: "ComposeViewController") as? ComposeViewController {
            controller.replyToStatus = status
            present(controller, animated: true)
        }
    }
    
    func attachmentTapped(_ sender: Any, status: StatusMO, index: Int) {
        if let attachment = status.attachments?[index] as? AttachmentMO, let attachmentType = AttachmentType(rawValue: attachment.type!) {
            switch attachmentType {
            case .video, .gifv:
                let avController = AVPlayerViewController()
                avController.player = AVPlayer(url: attachment.url!)
                avController.entersFullScreenWhenPlaybackBegins = false
                present(avController, animated: true)
            default:
                if let controller = storyboard().instantiateViewController(withIdentifier: "AttachmentPageViewController") as? AttachmentPageViewController {
                    controller.status = status
                    controller.attachmentIndex = index
                    
                    present(controller, animated: false)
                }
            }
        }
    }
    
    func urlTapped(_ sender: Any, url: URL) {
        let controller = SFSafariViewController(url: url)
        controller.delegate = self
        controller.dismissButtonStyle = .done
        controller.preferredControlTintColor = UIColor(named: "Primary")
        
        present(controller, animated: true)
    }
    
    func revealTapped(_ sender: Any) {}
    func hideTapped(_ sender: Any) {}
    func boostTapped(_ sender: Any) {}
    func favoriteTapped(_ sender: Any) {}
    
    func updateCell(_ cell: AbstractStatusTableViewCell, withStatusAt indexPath: IndexPath) {
        guard let status = fetchedResultsController?.object(at: indexPath) else {
            fatalError("CoreData error")
        }
        
        cell.statusView.update(withStatus: status)
        cell.statusView.topDividerView.isHidden = indexPath.row == 0
        cell.statusView.topLoadMoreView.isHidden = true
        cell.statusView.bottomLoadMoreView.isHidden = true
        
        let statusCount = fetchedResultsController?.fetchedObjects?.count ?? 0
        
        if let markers = status.markers {
            markers.forEach { marker in
                if marker.context == self.currentPaginationContext {
                    switch marker.item.direction {
                    case .prev:
                        if indexPath.row > 0, let previousStatus = fetchedResultsController?.object(at: IndexPath(row: indexPath.row - 1, section: indexPath.section)) {
                            let previousMarkers = previousStatus.markers ?? []
                            let previousMarker = previousMarkers.first { $0.context == self.currentPaginationContext && $0.item.direction == .next }
                            
                            if previousStatus.id! != marker.item.statusID && previousMarker != nil {
                                cell.statusView.topLoadMoreView.isHidden = false
                                cell.statusView.topDividerView.isHidden = true
                            }
                        }
                    case .next:
                        if indexPath.row < statusCount - 1, let nextStatus = fetchedResultsController?.object(at: IndexPath(row: indexPath.row + 1, section: indexPath.section)) {
                            let nextMarkers = nextStatus.markers ?? []
                            let nextMarker = nextMarkers.first { $0.context == self.currentPaginationContext && $0.item.direction == .prev }
                            
                            if nextStatus.id! != marker.item.statusID && nextMarker != nil {
                                cell.statusView.bottomLoadMoreView.isHidden = false
                                cell.statusView.bottomDividerView.isHidden = true
                            }
                        }
                    }
                }
            }
        }
        
        if indexPath.row == statusCount - 1 {
            cell.statusView.bottomLoadMoreView.isHidden = false
            cell.statusView.bottomDividerView.isHidden = true
        }
    }
}

extension AbstractStatusTableViewController: SFSafariViewControllerDelegate {
    func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
        controller.dismiss(animated: true)
    }
}