499 lines
18 KiB
Swift
499 lines
18 KiB
Swift
//
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// ProfileStatusesViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 10/6/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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import Pachyderm
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import Combine
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class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionViewController {
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weak var owner: ProfileViewController?
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let mastodonController: MastodonController
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private(set) var accountID: String!
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let kind: Kind
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var initialHeaderMode: HeaderMode?
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weak var profileHeaderDelegate: ProfileHeaderViewDelegate?
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private(set) var controller: TimelineLikeController<TimelineItem>!
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let confirmLoadMore = PassthroughSubject<Void, Never>()
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private var newer: RequestRange?
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private var older: RequestRange?
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private var cancellables = Set<AnyCancellable>()
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var collectionView: UICollectionView {
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view as! UICollectionView
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}
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private(set) var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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private(set) var headerCell: ProfileHeaderCollectionViewCell?
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private(set) var state: State = .unloaded
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init(accountID: String?, kind: Kind, owner: ProfileViewController) {
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self.accountID = accountID
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self.kind = kind
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self.owner = owner
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self.mastodonController = owner.mastodonController
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super.init(nibName: nil, bundle: nil)
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self.controller = TimelineLikeController(delegate: self)
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addKeyCommand(MenuController.refreshCommand(discoverabilityTitle: "Refresh Profile"))
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func loadView() {
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var config = UICollectionLayoutListConfiguration(appearance: .plain)
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config.leadingSwipeActionsConfigurationProvider = { [unowned self] in
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(collectionView.cellForItem(at: $0) as? TimelineStatusCollectionViewCell)?.leadingSwipeActions()
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}
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config.trailingSwipeActionsConfigurationProvider = { [unowned self] in
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(collectionView.cellForItem(at: $0) as? TimelineStatusCollectionViewCell)?.trailingSwipeActions()
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}
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionSeparatorConfiguration in
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guard let item = self.dataSource.itemIdentifier(for: indexPath) else {
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return sectionSeparatorConfiguration
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}
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var config = sectionSeparatorConfiguration
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if item.hideSeparators {
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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}
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if case .status(_, _, _) = item {
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config.topSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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config.bottomSeparatorInsets = TimelineStatusCollectionViewCell.separatorInsets
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}
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return config
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}
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let layout = UICollectionViewCompositionalLayout.list(using: config)
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view = UICollectionView(frame: .zero, collectionViewLayout: layout)
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collectionView.delegate = self
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collectionView.dragDelegate = self
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registerTimelineLikeCells()
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dataSource = createDataSource()
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl = UIRefreshControl()
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collectionView.refreshControl!.addTarget(self, action: #selector(refresh), for: .valueChanged)
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#endif
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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mastodonController.persistentContainer.accountSubject
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.receive(on: DispatchQueue.main)
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.filter { [unowned self] in $0 == self.accountID }
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.sink { [unowned self] id in
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switch state {
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case .unloaded:
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Task {
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await load()
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}
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case .loaded, .setupInitialSnapshot:
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var snapshot = dataSource.snapshot()
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snapshot.reconfigureItems([.header(id)])
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dataSource.apply(snapshot, animatingDifferences: true)
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}
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}
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.store(in: &cancellables)
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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collectionView.register(ProfileHeaderCollectionViewCell.self, forCellWithReuseIdentifier: "headerCell")
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let statusCell = UICollectionView.CellRegistration<TimelineStatusCollectionViewCell, (String, StatusState, Bool)> { [unowned self] cell, indexPath, item in
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cell.delegate = self
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cell.showPinned = item.2
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cell.updateUI(statusID: item.0, state: item.1)
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}
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return UICollectionViewDiffableDataSource(collectionView: collectionView) { [unowned self] collectionView, indexPath, itemIdentifier in
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switch itemIdentifier {
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case .header(let id):
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if let headerCell = self.headerCell {
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return headerCell
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} else {
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "headerCell", for: indexPath) as! ProfileHeaderCollectionViewCell
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switch self.initialHeaderMode {
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case nil:
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fatalError("missing initialHeaderMode")
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case .createView:
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let view = ProfileHeaderView.create()
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view.delegate = self.profileHeaderDelegate
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view.updateUI(for: id)
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view.pagesSegmentedControl.selectedSegmentIndex = self.owner?.currentIndex ?? 0
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cell.addHeader(view)
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case .useExistingView(let view):
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cell.addHeader(view)
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case .placeholder(height: let height):
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_ = cell.addConstraint(height: height)
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}
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self.headerCell = cell
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return cell
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}
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case .status(id: let id, state: let state, pinned: let pinned):
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return collectionView.dequeueConfiguredReusableCell(using: statusCell, for: indexPath, item: (id, state, pinned))
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case .loadingIndicator:
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return loadingIndicatorCell(for: indexPath)
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case .confirmLoadMore:
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return confirmLoadMoreCell(for: indexPath)
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}
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}
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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collectionView.indexPathsForSelectedItems?.forEach {
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collectionView.deselectItem(at: $0, animated: true)
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}
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Task {
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if case .notLoadedInitial = await controller.state {
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await load()
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}
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}
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}
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func setAccountID(_ id: String) {
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self.accountID = id
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// TODO: maybe this function should be async?
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Task {
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await load()
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}
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}
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private func load() async {
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guard isViewLoaded,
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let accountID,
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state == .unloaded,
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mastodonController.persistentContainer.account(for: accountID) != nil else {
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return
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}
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var snapshot = NSDiffableDataSourceSnapshot<Section, Item>()
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snapshot.appendSections([.header, .pinned, .statuses])
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snapshot.appendItems([.header(accountID)], toSection: .header)
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await apply(snapshot, animatingDifferences: false)
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state = .setupInitialSnapshot
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await controller.loadInitial()
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await tryLoadPinned()
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state = .loaded
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// remove any content inset that was added when switching pages to this VC
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collectionView.contentInset = .zero
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}
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private func tryLoadPinned() async {
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do {
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try await loadPinned()
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} catch {
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let config = ToastConfiguration(from: error, with: "Loading Pinned", in: self) { toast in
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toast.dismissToast(animated: true)
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await self.tryLoadPinned()
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}
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self.showToast(configuration: config, animated: true)
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}
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}
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private func loadPinned() async throws {
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guard case .statuses = kind,
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mastodonController.instanceFeatures.profilePinnedStatuses else {
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return
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}
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let request = Account.getStatuses(accountID, range: .default, onlyMedia: false, pinned: true, excludeReplies: false)
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let (statuses, _) = try await mastodonController.run(request)
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await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume()
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}
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}
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var snapshot = dataSource.snapshot()
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let existingPinned = snapshot.itemIdentifiers(inSection: .pinned)
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let items = statuses.map {
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let item = Item.status(id: $0.id, state: .unknown, pinned: true)
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// try to keep the existing status state
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if let existing = existingPinned.first(where: { $0 == item }) {
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return existing
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} else {
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return item
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}
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}
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snapshot.deleteItems(snapshot.itemIdentifiers(inSection: .pinned))
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snapshot.appendItems(items, toSection: .pinned)
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await apply(snapshot, animatingDifferences: true)
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}
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@objc func refresh() {
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guard case .loaded = state else {
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl?.endRefreshing()
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#endif
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return
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}
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Task {
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// TODO: coalesce these data source updates
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// TODO: refresh profile
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await controller.loadNewer()
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await tryLoadPinned()
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#if !targetEnvironment(macCatalyst)
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collectionView.refreshControl?.endRefreshing()
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#endif
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}
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}
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}
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extension ProfileStatusesViewController {
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enum State {
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case unloaded
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case setupInitialSnapshot
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case loaded
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}
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}
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extension ProfileStatusesViewController {
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enum Kind {
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case statuses, withReplies, onlyMedia
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}
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enum HeaderMode {
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case createView, useExistingView(ProfileHeaderView), placeholder(height: CGFloat)
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}
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}
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extension ProfileStatusesViewController {
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enum Section: TimelineLikeCollectionViewSection {
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case header
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case pinned
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case statuses
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case footer
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static var entries: Self { .statuses }
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}
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enum Item: TimelineLikeCollectionViewItem {
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typealias TimelineItem = String
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case header(String)
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case status(id: String, state: StatusState, pinned: Bool)
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case loadingIndicator
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case confirmLoadMore
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static func fromTimelineItem(_ item: String) -> Self {
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return .status(id: item, state: .unknown, pinned: false)
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}
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case let (.header(a), .header(b)):
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return a == b
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case let (.status(id: a, state: _, pinned: ap), .status(id: b, state: _, pinned: bp)):
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return a == b && ap == bp
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case (.loadingIndicator, .loadingIndicator):
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return true
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case (.confirmLoadMore, .confirmLoadMore):
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return true
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default:
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return false
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}
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}
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func hash(into hasher: inout Hasher) {
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switch self {
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case .header(let id):
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hasher.combine(0)
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hasher.combine(id)
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case .status(id: let id, state: _, pinned: let pinned):
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hasher.combine(1)
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hasher.combine(id)
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hasher.combine(pinned)
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case .loadingIndicator:
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hasher.combine(2)
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case .confirmLoadMore:
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hasher.combine(3)
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}
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}
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var hideSeparators: Bool {
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switch self {
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case .loadingIndicator, .confirmLoadMore:
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return true
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default:
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return false
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}
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}
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var isSelectable: Bool {
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switch self {
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case .status(id: _, state: _, pinned: _):
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return true
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default:
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return false
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}
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}
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}
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}
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extension ProfileStatusesViewController: TimelineLikeControllerDelegate {
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typealias TimelineItem = String // status ID
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private func request(for range: RequestRange = .default) -> Request<[Status]> {
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switch kind {
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case .statuses:
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return Account.getStatuses(accountID, range: range, onlyMedia: false, pinned: false, excludeReplies: true)
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case .withReplies:
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return Account.getStatuses(accountID, range: range, onlyMedia: false, pinned: false, excludeReplies: false)
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case .onlyMedia:
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return Account.getStatuses(accountID, range: range, onlyMedia: true, pinned: false, excludeReplies: false)
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}
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}
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func loadInitial() async throws -> [String] {
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let request = request()
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let (statuses, _) = try await mastodonController.run(request)
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if !statuses.isEmpty {
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newer = .after(id: statuses.first!.id, count: nil)
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older = .before(id: statuses.last!.id, count: nil)
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}
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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func loadNewer() async throws -> [String] {
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guard let newer else {
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throw Error.noNewer
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}
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let request = request(for: newer)
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let (statuses, _) = try await mastodonController.run(request)
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guard !statuses.isEmpty else {
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throw Error.allCaughtUp
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}
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self.newer = .after(id: statuses.first!.id, count: nil)
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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func loadOlder() async throws -> [String] {
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guard let older else {
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throw Error.noOlder
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}
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let request = request(for: older)
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let (statuses, _) = try await mastodonController.run(request)
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guard !statuses.isEmpty else {
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return []
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}
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self.older = .before(id: statuses.last!.id, count: nil)
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return await withCheckedContinuation { continuation in
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mastodonController.persistentContainer.addAll(statuses: statuses) {
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continuation.resume(returning: statuses.map(\.id))
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}
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}
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}
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enum Error: TimelineLikeCollectionViewError {
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case noNewer
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case noOlder
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case allCaughtUp
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}
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}
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extension ProfileStatusesViewController: UICollectionViewDelegate {
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func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
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guard case .statuses = dataSource.sectionIdentifier(for: indexPath.section) else {
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return
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}
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let itemsInSection = collectionView.numberOfItems(inSection: indexPath.section)
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if indexPath.row == itemsInSection - 1 {
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Task {
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await controller.loadOlder()
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}
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}
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}
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func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool {
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return dataSource.itemIdentifier(for: indexPath)?.isSelectable ?? false
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}
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func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
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guard case .status(id: let id, state: let state, pinned: _) = dataSource.itemIdentifier(for: indexPath) else {
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return
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}
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let status = mastodonController.persistentContainer.status(for: id)!
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selected(status: status.reblog?.id ?? id, state: state.copy())
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}
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func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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return (collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.contextMenuConfiguration()
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}
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func collectionView(_ collectionView: UICollectionView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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MenuPreviewHelper.willPerformPreviewAction(animator: animator, presenter: self)
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}
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}
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extension ProfileStatusesViewController: UICollectionViewDragDelegate {
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func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
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(collectionView.cellForItem(at: indexPath) as? TimelineStatusCollectionViewCell)?.dragItemsForBeginning(session: session) ?? []
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}
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}
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extension ProfileStatusesViewController: TuskerNavigationDelegate {
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var apiController: MastodonController! { mastodonController }
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}
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extension ProfileStatusesViewController: MenuActionProvider {
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}
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extension ProfileStatusesViewController: StatusCollectionViewCellDelegate {
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func statusCellNeedsReconfigure(_ cell: StatusCollectionViewCell, animated: Bool, completion: (() -> Void)?) {
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if let indexPath = collectionView.indexPath(for: cell) {
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var snapshot = dataSource.snapshot()
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snapshot.reconfigureItems([dataSource.itemIdentifier(for: indexPath)!])
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dataSource.apply(snapshot, animatingDifferences: animated, completion: completion)
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}
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}
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}
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extension ProfileStatusesViewController: TabBarScrollableViewController {
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func tabBarScrollToTop() {
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collectionView.scrollToTop()
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}
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}
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extension ProfileStatusesViewController: StatusBarTappableViewController {
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func handleStatusBarTapped(xPosition: CGFloat) -> StatusBarTapActionResult {
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collectionView.scrollToTop()
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return .stop
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}
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}
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