126 lines
4.5 KiB
Swift
126 lines
4.5 KiB
Swift
//
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// SearchResultViewModel.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-7-14.
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//
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import Foundation
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import Combine
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import CoreData
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import CoreDataStack
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import GameplayKit
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final class SearchResultViewModel {
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var disposeBag = Set<AnyCancellable>()
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// input
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let context: AppContext
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let searchScope: SearchDetailViewModel.SearchScope
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let searchText = CurrentValueSubject<String, Never>("")
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let statusFetchedResultsController: StatusFetchedResultsController
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let viewDidAppear = CurrentValueSubject<Bool, Never>(false)
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// output
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private(set) lazy var stateMachine: GKStateMachine = {
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let stateMachine = GKStateMachine(states: [
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State.Initial(viewModel: self),
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State.Loading(viewModel: self),
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State.Fail(viewModel: self),
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State.Idle(viewModel: self),
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State.NoMore(viewModel: self),
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])
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stateMachine.enter(State.Initial.self)
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return stateMachine
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}()
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let items = CurrentValueSubject<[SearchResultItem], Never>([])
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var diffableDataSource: UITableViewDiffableDataSource<SearchResultSection, SearchResultItem>!
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let didDataSourceUpdate = PassthroughSubject<Void, Never>()
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init(context: AppContext, searchScope: SearchDetailViewModel.SearchScope) {
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self.context = context
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self.searchScope = searchScope
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self.statusFetchedResultsController = StatusFetchedResultsController(
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managedObjectContext: context.managedObjectContext,
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domain: nil,
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additionalTweetPredicate: nil
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)
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context.authenticationService.activeMastodonAuthenticationBox
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.map { $0?.domain }
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.assign(to: \.value, on: statusFetchedResultsController.domain)
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.store(in: &disposeBag)
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Publishers.CombineLatest(
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items,
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statusFetchedResultsController.objectIDs.removeDuplicates()
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)
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.receive(on: DispatchQueue.main)
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.sink { [weak self] items, statusObjectIDs in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<SearchResultSection, SearchResultItem>()
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snapshot.appendSections([.main])
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// append account & hashtag items
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snapshot.appendItems(items, toSection: .main)
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var oldSnapshotAttributeDict: [NSManagedObjectID : Item.StatusAttribute] = [:]
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let oldSnapshot = diffableDataSource.snapshot()
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for item in oldSnapshot.itemIdentifiers {
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guard case let .status(objectID, attribute) = item else { continue }
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oldSnapshotAttributeDict[objectID] = attribute
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}
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// append statuses
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var statusItems: [SearchResultItem] = []
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for objectID in statusObjectIDs {
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let attribute = oldSnapshotAttributeDict[objectID] ?? Item.StatusAttribute()
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statusItems.append(.status(statusObjectID: objectID, attribute: attribute))
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}
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snapshot.appendItems(statusItems, toSection: .main)
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if let currentState = self.stateMachine.currentState {
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switch currentState {
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case is State.Loading, is State.Fail, is State.Fail:
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snapshot.appendItems([.bottomLoader], toSection: .main)
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case is State.NoMore:
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break
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default:
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break
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}
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}
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diffableDataSource.defaultRowAnimation = .fade
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diffableDataSource.apply(snapshot, animatingDifferences: true) { [weak self] in
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guard let self = self else { return }
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self.didDataSourceUpdate.send()
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}
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}
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.store(in: &disposeBag)
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}
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}
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extension SearchResultViewModel {
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func setupDiffableDataSource(
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tableView: UITableView,
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dependency: NeedsDependency,
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statusTableViewCellDelegate: StatusTableViewCellDelegate
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) {
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diffableDataSource = SearchResultSection.tableViewDiffableDataSource(
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for: tableView,
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dependency: dependency,
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statusTableViewCellDelegate: statusTableViewCellDelegate
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)
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var snapshot = NSDiffableDataSourceSnapshot<SearchResultSection, SearchResultItem>()
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snapshot.appendSections([.main])
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snapshot.appendItems(self.items.value, toSection: .main) // with initial items
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diffableDataSource.apply(snapshot, animatingDifferences: false)
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}
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}
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