frenzy-ios/Reader/Screens/Home/HomeViewController.swift

310 lines
12 KiB
Swift

//
// HomeViewController.swift
// Reader
//
// Created by Shadowfacts on 11/25/21.
//
import UIKit
import CoreData
protocol HomeViewControllerDelegate: AnyObject {
func switchToAccount(_ account: LocalData.Account)
}
class HomeViewController: UIViewController {
weak var delegate: HomeViewControllerDelegate?
weak var itemsDelegate: ItemsViewControllerDelegate?
let fervorController: FervorController
var enableStretchyMenu = true
private var collectionView: UICollectionView!
private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
private var groupResultsController: NSFetchedResultsController<Group>!
private var feedResultsController: NSFetchedResultsController<Feed>!
init(fervorController: FervorController) {
self.fervorController = fervorController
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
// todo: account info
title = "Reader"
if enableStretchyMenu {
view.addInteraction(StretchyMenuInteraction(delegate: self))
}
if UIDevice.current.userInterfaceIdiom != .mac {
view.backgroundColor = .appBackground
}
var config = UICollectionLayoutListConfiguration(appearance: UIDevice.current.userInterfaceIdiom == .mac ? .sidebar : .grouped)
config.headerMode = .supplementary
config.backgroundColor = .clear
config.separatorConfiguration.topSeparatorVisibility = .visible
config.separatorConfiguration.topSeparatorInsets = NSDirectionalEdgeInsets(top: 0, leading: 20, bottom: 0, trailing: 0)
config.separatorConfiguration.bottomSeparatorVisibility = .hidden
config.itemSeparatorHandler = { indexPath, defaultConfig in
var config = defaultConfig
if indexPath.section == 0 && indexPath.row == 0 {
config.topSeparatorVisibility = .hidden
}
return config
}
let layout = UICollectionViewCompositionalLayout.list(using: config)
collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
collectionView.delegate = self
view.addSubview(collectionView)
dataSource = createDataSource()
var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
snapshot.appendSections([.all, .groups, .feeds])
snapshot.appendItems([.unread, .all], toSection: .all)
dataSource.apply(snapshot, animatingDifferences: false)
let groupReq = Group.fetchRequest()
groupReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
groupResultsController = NSFetchedResultsController(fetchRequest: groupReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
groupResultsController.delegate = self
try! groupResultsController.performFetch()
let feedReq = Feed.fetchRequest()
feedReq.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
feedResultsController = NSFetchedResultsController(fetchRequest: feedReq, managedObjectContext: fervorController.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
feedResultsController.delegate = self
try! feedResultsController.performFetch()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let indexPaths = collectionView.indexPathsForSelectedItems {
for indexPath in indexPaths {
collectionView.deselectItem(at: indexPath, animated: true)
}
}
var snapshot = dataSource.snapshot()
// reconfigure so that unread counts update
snapshot.reconfigureItems(snapshot.itemIdentifiers)
dataSource.apply(snapshot)
}
private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
let sectionHeaderCell = UICollectionView.SupplementaryRegistration<UICollectionViewListCell>(elementKind: UICollectionView.elementKindSectionHeader) { supplementaryView, elementKind, indexPath in
let section = self.dataSource.sectionIdentifier(for: indexPath.section)!
var config = supplementaryView.defaultContentConfiguration()
config.text = section.title
supplementaryView.contentConfiguration = config
}
let listCell = UICollectionView.CellRegistration<HomeCollectionViewCell, Item> { cell, indexPath, item in
var config = UIListContentConfiguration.valueCell()
config.text = item.title
if let req = item.countFetchRequest,
let count = try? self.fervorController.persistentContainer.viewContext.count(for: req) {
config.secondaryText = "\(count)"
config.secondaryTextProperties.color = .tintColor
}
cell.contentConfiguration = config
cell.accessories = [.disclosureIndicator()]
}
let dataSource = UICollectionViewDiffableDataSource<Section, Item>(collectionView: collectionView) { collectionView, indexPath, item in
return collectionView.dequeueConfiguredReusableCell(using: listCell, for: indexPath, item: item)
}
dataSource.supplementaryViewProvider = { collectionView, elementKind, indexPath in
if elementKind == UICollectionView.elementKindSectionHeader {
return collectionView.dequeueConfiguredReusableSupplementary(using: sectionHeaderCell, for: indexPath)
} else {
return nil
}
}
return dataSource
}
}
extension HomeViewController {
enum Section: Hashable {
case all
case groups
case feeds
var title: String {
switch self {
case .all:
return ""
case .groups:
return "Groups"
case .feeds:
return "Feeds"
}
}
}
enum Item: Hashable {
case unread
case all
case group(Group)
case feed(Feed)
var title: String {
switch self {
case .unread:
return "Unread Articles"
case .all:
return "All Articles"
case let .group(group):
return group.title
case let .feed(feed):
return feed.title!
}
}
var fetchRequest: NSFetchRequest<Reader.Item> {
let req = Reader.Item.fetchRequest()
switch self {
case .unread:
req.predicate = NSPredicate(format: "read = NO")
case .all:
break
case .group(let group):
req.predicate = NSPredicate(format: "feed in %@", group.feeds!)
case .feed(let feed):
req.predicate = NSPredicate(format: "feed = %@", feed)
}
return req
}
var idFetchRequest: NSFetchRequest<NSManagedObjectID> {
let req = NSFetchRequest<NSManagedObjectID>(entityName: "Item")
req.resultType = .managedObjectIDResultType
switch self {
case .unread:
req.predicate = NSPredicate(format: "read = NO")
case .all:
break
case .group(let group):
req.predicate = NSPredicate(format: "feed in %@", group.feeds!)
case .feed(let feed):
req.predicate = NSPredicate(format: "feed = %@", feed)
}
return req
}
var countFetchRequest: NSFetchRequest<Reader.Item>? {
let req = Reader.Item.fetchRequest()
switch self {
case .unread:
req.predicate = NSPredicate(format: "read = NO")
case .all:
return nil
case .group(let group):
req.predicate = NSPredicate(format: "read = NO AND feed in %@", group.feeds!)
case .feed(let feed):
req.predicate = NSPredicate(format: "read = NO AND feed = %@", feed)
}
return req
}
}
}
extension HomeViewController: NSFetchedResultsControllerDelegate {
func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChangeContentWith snapshot: NSDiffableDataSourceSnapshotReference) {
var snapshot = dataSource.snapshot()
if controller == groupResultsController {
if snapshot.sectionIdentifiers.contains(.groups) {
snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .groups))
}
snapshot.appendItems(controller.fetchedObjects!.map { .group($0 as! Group) }, toSection: .groups)
} else if controller == feedResultsController {
if snapshot.sectionIdentifiers.contains(.feeds) {
snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .feeds))
}
snapshot.appendItems(controller.fetchedObjects!.map { .feed($0 as! Feed) }, toSection: .feeds)
}
dataSource.apply(snapshot, animatingDifferences: false)
}
}
extension HomeViewController: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
guard let item = dataSource.itemIdentifier(for: indexPath) else {
return
}
let vc = ItemsViewController(fetchRequest: item.idFetchRequest, fervorController: fervorController)
vc.title = item.title
vc.delegate = itemsDelegate
show(vc, sender: nil)
UISelectionFeedbackGenerator().selectionChanged()
}
func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
guard let item = dataSource.itemIdentifier(for: indexPath) else {
return nil
}
return UIContextMenuConfiguration(identifier: nil, previewProvider: {
return ItemsViewController(fetchRequest: item.idFetchRequest, fervorController: self.fervorController)
}, actionProvider: nil)
}
func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
guard let vc = animator.previewViewController else {
return
}
animator.preferredCommitStyle = .pop
animator.addCompletion {
self.show(vc, sender: nil)
}
}
}
extension HomeViewController: StretchyMenuInteractionDelegate {
func stretchyMenuTitle() -> String? {
return "Switch Accounts"
}
func stretchyMenuItems() -> [StretchyMenuItem] {
var items: [StretchyMenuItem] = LocalData.accounts.map { account in
var title = account.instanceURL.host!
if let port = account.instanceURL.port, port != 80 && port != 443 {
title += ":\(port)"
}
let subtitle = account.id == fervorController.account!.id ? "Currently logged in" : nil
return StretchyMenuItem(title: title, subtitle: subtitle) { [unowned self] in
guard account.id != self.fervorController.account!.id else { return }
self.delegate?.switchToAccount(account)
}
}
items.append(StretchyMenuItem(title: "Add Account", subtitle: nil, action: { [unowned self] in
let login = LoginViewController()
login.delegate = self
login.navigationItem.leftBarButtonItem = UIBarButtonItem(systemItem: .cancel, primaryAction: UIAction(handler: { (_) in
self.dismiss(animated: true)
}), menu: nil)
let nav = UINavigationController(rootViewController: login)
self.present(nav, animated: true)
}))
return items
}
}
extension HomeViewController: LoginViewControllerDelegate {
func didLogin(with controller: FervorController) {
self.dismiss(animated: true)
(view.window!.windowScene!.delegate as! SceneDelegate).didLogin(with: controller)
}
}