115 lines
4.4 KiB
Swift
115 lines
4.4 KiB
Swift
// Copyright © 2021 Metabolist. All rights reserved.
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import Combine
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import UIKit
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import ViewModels
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enum IdentitiesSection: Hashable {
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case add
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case identities(String)
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}
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enum IdentitiesItem: Hashable {
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case add
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case identitiy(Identity)
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}
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final class IdentitiesDataSource: UITableViewDiffableDataSource<IdentitiesSection, IdentitiesItem> {
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private let updateQueue =
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DispatchQueue(label: "com.metabolist.metatext.identities-data-source.update-queue")
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private var cancellables = Set<AnyCancellable>()
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init(tableView: UITableView,
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publisher: AnyPublisher<[Identity], Never>,
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viewModelProvider: @escaping (Identity) -> IdentityViewModel) {
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tableView.register(UITableViewCell.self,
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forCellReuseIdentifier: String(describing: UITableViewCell.self))
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tableView.register(IdentityTableViewCell.self,
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forCellReuseIdentifier: String(describing: IdentityTableViewCell.self))
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super.init(tableView: tableView) { tableView, indexPath, item in
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let cell = tableView.dequeueReusableCell(withIdentifier: item.cellReuseIdentifier,
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for: indexPath)
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switch item {
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case .add:
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var configuration = cell.defaultContentConfiguration()
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configuration.text = NSLocalizedString("add", comment: "")
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configuration.image = UIImage(systemName: "plus.circle.fill")
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cell.contentConfiguration = configuration
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case let .identitiy(identity):
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let viewModel = viewModelProvider(identity)
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(cell as? IdentityTableViewCell)?.viewModel = viewModel
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cell.accessoryType = identity.id == viewModel.identityContext.identity.id ? .checkmark : .none
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}
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return cell
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}
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publisher
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.sink { [weak self] in self?.update(identities: $0) }
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.store(in: &cancellables)
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}
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override func apply(_ snapshot: NSDiffableDataSourceSnapshot<IdentitiesSection, IdentitiesItem>,
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animatingDifferences: Bool = true,
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completion: (() -> Void)? = nil) {
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updateQueue.async {
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super.apply(snapshot, animatingDifferences: animatingDifferences, completion: completion)
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}
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}
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override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
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let currentSnapshot = snapshot()
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let section = currentSnapshot.sectionIdentifiers[section]
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if currentSnapshot.numberOfItems(inSection: section) > 0, case let .identities(title) = section {
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return title
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}
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return nil
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}
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override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
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itemIdentifier(for: indexPath) != .add
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}
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}
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private extension IdentitiesDataSource {
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private func update(identities: [Identity]) {
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var newSnapshot = NSDiffableDataSourceSnapshot<IdentitiesSection, IdentitiesItem>()
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let sections = [
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(section: IdentitiesSection.identities(NSLocalizedString("identities.accounts", comment: "")),
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identities: identities.filter { $0.authenticated && !$0.pending }.map(IdentitiesItem.identitiy)),
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(section: IdentitiesSection.identities(NSLocalizedString("identities.browsing", comment: "")),
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identities: identities.filter { !$0.authenticated && !$0.pending }.map(IdentitiesItem.identitiy)),
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(section: IdentitiesSection.identities(NSLocalizedString("identities.pending", comment: "")),
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identities: identities.filter { $0.pending }.map(IdentitiesItem.identitiy))
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]
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.filter { !$0.identities.isEmpty }
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newSnapshot.appendSections([.add] + sections.map(\.section))
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newSnapshot.appendItems([.add], toSection: .add)
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for section in sections {
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newSnapshot.appendItems(section.identities, toSection: section.section)
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}
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apply(newSnapshot, animatingDifferences: !snapshot().sectionIdentifiers.filter { $0 != .add }.isEmpty)
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}
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}
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private extension IdentitiesItem {
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var cellReuseIdentifier: String {
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switch self {
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case .add:
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return String(describing: UITableViewCell.self)
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case .identitiy:
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return String(describing: IdentityTableViewCell.self)
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}
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}
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}
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