397 lines
15 KiB
Swift
397 lines
15 KiB
Swift
//
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// TimelineViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 9/20/22.
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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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import SwiftSoup
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// TODO: gonna need a thing to replicate all of EnhancedTableViewController
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class TimelineViewController: UIViewController {
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let timeline: Timeline
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weak var mastodonController: MastodonController!
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private var controller: TimelineLikeController<TimelineItem>!
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private var 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 collectionView: UICollectionView {
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view as! UICollectionView
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}
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private var dataSource: UICollectionViewDiffableDataSource<Section, Item>!
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init(for timeline: Timeline, mastodonController: MastodonController!) {
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self.timeline = timeline
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self.mastodonController = mastodonController
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super.init(nibName: nil, bundle: nil)
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self.controller = TimelineLikeController(delegate: self)
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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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// TODO: swipe actions
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// config.trailingSwipeActionsConfigurationProvider =
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config.itemSeparatorHandler = { [unowned self] indexPath, sectionSeparatorConfiguration in
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if let item = self.dataSource.itemIdentifier(for: indexPath),
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item.hideSeparators {
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var config = sectionSeparatorConfiguration
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config.topSeparatorVisibility = .hidden
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config.bottomSeparatorVisibility = .hidden
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return config
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} else {
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return sectionSeparatorConfiguration
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}
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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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// TODO: delegates
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collectionView.delegate = self
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// collectionView.dragDelegate = self
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dataSource = createDataSource()
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applyInitialSnapshot()
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#if !targetEnvironment(macCatalyst)
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let refreshControl = UIRefreshControl(frame: .zero, primaryAction: UIAction(handler: { [unowned self] _ in
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Task {
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await self.controller.loadNewer()
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self.collectionView.refreshControl!.endRefreshing()
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}
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}))
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collectionView.refreshControl = refreshControl
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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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// TODO: refresh key command
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}
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private func createDataSource() -> UICollectionViewDiffableDataSource<Section, Item> {
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let listCell = UICollectionView.CellRegistration<UICollectionViewListCell, Item> { [unowned self] cell, indexPath, item in
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guard case .status(id: let id, state: _) = item,
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let status = mastodonController.persistentContainer.status(for: id) else {
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fatalError()
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}
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var config = cell.defaultContentConfiguration()
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let doc = try! SwiftSoup.parseBodyFragment(status.content)
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config.text = try! doc.text()
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cell.contentConfiguration = config
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}
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collectionView.register(LoadingCollectionViewCell.self, forCellWithReuseIdentifier: "loadingIndicator")
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collectionView.register(ConfirmLoadMoreCollectionViewCell.self, forCellWithReuseIdentifier: "confirmLoadMore")
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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 .status(_, _):
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return collectionView.dequeueConfiguredReusableCell(using: listCell, for: indexPath, item: itemIdentifier)
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case .loadingIndicator:
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "loadingIndicator", for: indexPath) as! LoadingCollectionViewCell
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cell.indicator.startAnimating()
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return cell
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case .confirmLoadMore:
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "confirmLoadMore", for: indexPath) as! ConfirmLoadMoreCollectionViewCell
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cell.confirmLoadMore = self.confirmLoadMore
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Task {
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if case .loadingOlder(_, _) = await controller.state {
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cell.isLoading = true
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} else {
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cell.isLoading = false
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}
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}
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return cell
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}
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}
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}
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private func applyInitialSnapshot() {
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// TODO: this might not be necessary
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// TODO: yes it is, for public timeline descriptions
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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Task {
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await controller.loadInitial()
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}
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}
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}
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extension TimelineViewController {
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enum Section: Hashable {
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case header
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case statuses
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case footer
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}
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enum Item: Hashable {
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case status(id: String, state: StatusState)
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case loadingIndicator
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case confirmLoadMore
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// // TODO: remove local param from this
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// case publicTimelineDescription(local: Bool)
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static func ==(lhs: Item, rhs: Item) -> Bool {
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switch (lhs, rhs) {
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case let (.status(id: a, state: _), .status(id: b, state: _)):
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return a == b
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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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// case let (.publicTimelineDescription(local: a), .publicTimelineDescription(local: b)):
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// return a == b
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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 .status(id: let id, state: _):
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hasher.combine(0)
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hasher.combine(id)
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case .loadingIndicator:
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hasher.combine(1)
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case .confirmLoadMore:
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hasher.combine(2)
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// case .publicTimelineDescription(local: let local):
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// hasher.combine(3)
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// hasher.combine(local)
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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:
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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 TimelineViewController: TimelineLikeControllerDelegate {
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typealias TimelineItem = String // status ID
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func loadInitial() async throws -> [TimelineItem] {
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guard let mastodonController else {
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throw Error.noClient
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}
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try await Task.sleep(nanoseconds: 2 * NSEC_PER_SEC)
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let request = Client.getStatuses(timeline: timeline)
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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 -> [TimelineItem] {
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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 = Client.getStatuses(timeline: timeline, range: 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 -> [TimelineItem] {
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guard let older else {
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throw Error.noOlder
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}
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try await Task.sleep(nanoseconds: 2 * NSEC_PER_SEC)
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let request = Client.getStatuses(timeline: timeline, range: older)
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let (statuses, _) = try await mastodonController.run(request)
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if !statuses.isEmpty {
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self.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 canLoadOlder() async -> Bool {
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if Preferences.shared.disableInfiniteScrolling {
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var snapshot = dataSource.snapshot()
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if !snapshot.itemIdentifiers.contains(.confirmLoadMore) {
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if !snapshot.sectionIdentifiers.contains(.footer) {
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snapshot.appendSections([.footer])
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}
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snapshot.appendItems([.confirmLoadMore], toSection: .footer)
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await dataSource.apply(snapshot, animatingDifferences: false)
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}
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for await _ in self.confirmLoadMore.values {
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return true
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}
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fatalError("unreachable")
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} else {
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return true
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}
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}
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func handleEvent(_ event: TimelineLikeController<TimelineItem>.Event) async {
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switch event {
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case .addLoadingIndicator:
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var snapshot = dataSource.snapshot()
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if !snapshot.sectionIdentifiers.contains(.footer) {
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snapshot.appendSections([.footer])
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}
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if snapshot.itemIdentifiers.contains(.confirmLoadMore) {
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snapshot.reconfigureItems([.confirmLoadMore])
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} else {
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snapshot.appendItems([.loadingIndicator], toSection: .footer)
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}
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await dataSource.apply(snapshot, animatingDifferences: false)
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case .removeLoadingIndicator:
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let oldContentOffset = collectionView.contentOffset
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var snapshot = dataSource.snapshot()
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snapshot.deleteSections([.footer])
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await dataSource.apply(snapshot, animatingDifferences: false)
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collectionView.contentOffset = oldContentOffset
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case .loadAllError(let error, _):
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let config = ToastConfiguration(from: error, with: "Error Loading", in: self) { [weak self] (toast: ToastView) in
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toast.dismissToast(animated: true)
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Task {
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await self?.controller.loadInitial()
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}
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}
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self.showToast(configuration: config, animated: true)
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case .replaceAllItems(let ids, _):
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var snapshot = dataSource.snapshot()
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if snapshot.sectionIdentifiers.contains(.statuses) {
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snapshot.deleteSections([.statuses])
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}
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snapshot.appendSections([.statuses])
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snapshot.appendItems(ids.map { .status(id: $0, state: .unknown) }, toSection: .statuses)
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await dataSource.apply(snapshot, animatingDifferences: false)
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case .loadNewerError(Error.allCaughtUp, _):
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var config = ToastConfiguration(title: "You're all caught up")
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config.edge = .top
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config.dismissAutomaticallyAfter = 2
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config.action = { (toast) in
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toast.dismissToast(animated: true)
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}
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self.showToast(configuration: config, animated: true)
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case .loadNewerError(let error, _):
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let config = ToastConfiguration(from: error, with: "Error Loading Newer", in: self) { [weak self] (toast: ToastView) in
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toast.dismissToast(animated: true)
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Task {
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await self?.controller.loadNewer()
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}
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}
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self.showToast(configuration: config, animated: true)
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case .prependItems(let ids, _):
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var snapshot = dataSource.snapshot()
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let items = ids.map { Item.status(id: $0, state: .unknown) }
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let first = snapshot.itemIdentifiers(inSection: .statuses).first
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if let first {
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snapshot.insertItems(items, beforeItem: first)
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} else {
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snapshot.appendItems(items, toSection: .statuses)
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}
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await dataSource.apply(snapshot, animatingDifferences: false)
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if let first,
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let indexPath = dataSource.indexPath(for: first) {
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// TODO: i can't tell if this actually works or not
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// maintain the current position in the list (don't scroll to top)
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collectionView.scrollToItem(at: indexPath, at: .top, animated: false)
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}
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case .loadOlderError(let error, _):
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let config = ToastConfiguration(from: error, with: "Error Loading Older", in: self) { [weak self] (toast: ToastView) in
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toast.dismissToast(animated: true)
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Task {
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await self?.controller.loadOlder()
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}
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}
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self.showToast(configuration: config, animated: true)
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case .appendItems(let ids, _):
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var snapshot = dataSource.snapshot()
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if snapshot.itemIdentifiers.contains(.confirmLoadMore) {
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snapshot.deleteItems([.confirmLoadMore])
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}
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snapshot.appendItems(ids.map { .status(id: $0, state: .unknown) }, toSection: .statuses)
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await dataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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enum Error: Swift.Error {
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case noClient
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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 TimelineViewController: 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),
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case .status(_, _) = dataSource.itemIdentifier(for: indexPath) 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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}
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extension TimelineViewController: ToastableViewController {
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}
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