//
//  ComposeStatusAttachmentTableViewCell.swift
//  Mastodon
//
//  Created by MainasuK Cirno on 2021-6-29.
//

import UIKit
import SwiftUI
import Combine
import AlamofireImage
import MastodonAsset
import MastodonCore
import MastodonLocalization
import UIHostingConfigurationBackport

//final class ComposeStatusAttachmentTableViewCell: UITableViewCell {
//
//    private(set) var dataSource: UICollectionViewDiffableDataSource<ComposeStatusAttachmentSection, ComposeStatusAttachmentItem>!
//    weak var composeStatusAttachmentCollectionViewCellDelegate: ComposeStatusAttachmentCollectionViewCellDelegate?
//    var observations = Set<NSKeyValueObservation>()
//
//    private static func createLayout() -> UICollectionViewLayout {
//        let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(44))
//        let item = NSCollectionLayoutItem(layoutSize: itemSize)
//        let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(44))
//        let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
//        let section = NSCollectionLayoutSection(group: group)
//        section.contentInsetsReference = .readableContent
//        return UICollectionViewCompositionalLayout(section: section)
//    }
//
//    private(set) var collectionViewHeightLayoutConstraint: NSLayoutConstraint!
//    let collectionView: UICollectionView = {
//        let collectionViewLayout = ComposeStatusAttachmentTableViewCell.createLayout()
//        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: collectionViewLayout)
//        collectionView.register(ComposeStatusAttachmentCollectionViewCell.self, forCellWithReuseIdentifier: String(describing: ComposeStatusAttachmentCollectionViewCell.self))
//        collectionView.backgroundColor = .clear
//        collectionView.alwaysBounceVertical = true
//        collectionView.isScrollEnabled = false
//        return collectionView
//    }()
//    let collectionViewHeightDidUpdate = PassthroughSubject<Void, Never>()
//
//    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
//        super.init(style: style, reuseIdentifier: reuseIdentifier)
//        _init()
//    }
//
//    required init?(coder: NSCoder) {
//        super.init(coder: coder)
//        _init()
//    }
//
//}
//
//extension ComposeStatusAttachmentTableViewCell {
//
//    private func _init() {
//        backgroundColor = .clear
//        contentView.backgroundColor = .clear
//
//        collectionView.translatesAutoresizingMaskIntoConstraints = false
//        contentView.addSubview(collectionView)
//        collectionViewHeightLayoutConstraint = collectionView.heightAnchor.constraint(equalToConstant: 200).priority(.defaultHigh)
//        NSLayoutConstraint.activate([
//            collectionView.topAnchor.constraint(equalTo: contentView.topAnchor),
//            collectionView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
//            collectionView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
//            collectionView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
//            collectionViewHeightLayoutConstraint,
//        ])
//
//        collectionView.observe(\.contentSize, options: [.initial, .new]) { [weak self] collectionView, _ in
//            guard let self = self else { return }
//            self.collectionViewHeightLayoutConstraint.constant = collectionView.contentSize.height
//            self.collectionViewHeightDidUpdate.send()
//        }
//        .store(in: &observations)
//
//        self.dataSource = UICollectionViewDiffableDataSource(collectionView: collectionView) {
//            [weak self] collectionView, indexPath, item -> UICollectionViewCell? in
//            guard let _ = self else { return UICollectionViewCell() }
//            switch item {
//            case .attachment:
//                let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: ComposeStatusAttachmentCollectionViewCell.self), for: indexPath) as! ComposeStatusAttachmentCollectionViewCell
//                cell.contentConfiguration = UIHostingConfigurationBackport {
//                    HStack {
//                        Image(systemName: "star")
//                        Text("Favorites")
//                        Spacer()
//                    }
//                }
////                cell.attachmentContainerView.descriptionTextView.text = attachmentService.description.value
////                cell.delegate = self.composeStatusAttachmentCollectionViewCellDelegate
////                attachmentService.thumbnailImage
////                    .receive(on: DispatchQueue.main)
////                    .sink { [weak cell] thumbnailImage in
////                        guard let cell = cell else { return }
////                        let size = cell.attachmentContainerView.previewImageView.frame.size != .zero ? cell.attachmentContainerView.previewImageView.frame.size : CGSize(width: 1, height: 1)
////                        guard let image = thumbnailImage else {
////                            let placeholder = UIImage.placeholder(
////                                size: size,
////                                color: ThemeService.shared.currentTheme.value.systemGroupedBackgroundColor
////                            )
////                            .af.imageRounded(
////                                withCornerRadius: AttachmentContainerView.containerViewCornerRadius
////                            )
////                            cell.attachmentContainerView.previewImageView.image = placeholder
////                            return
////                        }
////                        // cannot get correct size. set corner radius on layer
////                        cell.attachmentContainerView.previewImageView.image = image
////                    }
////                    .store(in: &cell.disposeBag)
////                Publishers.CombineLatest(
////                    attachmentService.uploadStateMachineSubject.eraseToAnyPublisher(),
////                    attachmentService.error.eraseToAnyPublisher()
////                )
////                .receive(on: DispatchQueue.main)
////                .sink { [weak cell, weak attachmentService] uploadState, error  in
////                    guard let cell = cell else { return }
////                    guard let attachmentService = attachmentService else { return }
////                    cell.attachmentContainerView.emptyStateView.isHidden = error == nil
////                    cell.attachmentContainerView.descriptionBackgroundView.isHidden = error != nil
////                    if let error = error {
////                        cell.attachmentContainerView.activityIndicatorView.stopAnimating()
////                        cell.attachmentContainerView.emptyStateView.label.text = error.localizedDescription
////                    } else {
////                        guard let uploadState = uploadState else { return }
////                        switch uploadState {
////                        case is MastodonAttachmentService.UploadState.Finish:
////                            cell.attachmentContainerView.activityIndicatorView.stopAnimating()
////                        case  is MastodonAttachmentService.UploadState.Fail:
////                            cell.attachmentContainerView.activityIndicatorView.stopAnimating()
////                            // FIXME: not display
////                            cell.attachmentContainerView.emptyStateView.label.text = {
////                                if let file = attachmentService.file.value {
////                                    switch file {
////                                    case .jpeg, .png, .gif:
////                                        return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.photo)
////                                    case .other:
////                                        return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.video)
////                                    }
////                                } else {
////                                    return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.photo)
////                                }
////                            }()
////                        default:
////                            break
////                        }
////                    }
////                }
////                .store(in: &cell.disposeBag)
////                NotificationCenter.default.publisher(
////                    for: UITextView.textDidChangeNotification,
////                    object: cell.attachmentContainerView.descriptionTextView
////                )
////                .receive(on: DispatchQueue.main)
////                .sink { notification in
////                    guard let textField = notification.object as? UITextView else { return }
////                    let text = textField.text?.trimmingCharacters(in: .whitespacesAndNewlines)
////                    attachmentService.description.value = text
////                }
////                .store(in: &cell.disposeBag)
//                return cell
//            }
//        }
//    }
//
//}
//