138 lines
4.4 KiB
Swift
138 lines
4.4 KiB
Swift
//
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// ThreadViewModel.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-4-12.
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//
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import os.log
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import UIKit
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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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import MastodonSDK
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import MastodonMeta
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import MastodonAsset
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import MastodonCore
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import MastodonLocalization
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class ThreadViewModel {
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let logger = Logger(subsystem: "ThreadViewModel", category: "ViewModel")
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var disposeBag = Set<AnyCancellable>()
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var rootItemObserver: AnyCancellable?
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// input
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let context: AppContext
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let authContext: AuthContext
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let mastodonStatusThreadViewModel: MastodonStatusThreadViewModel
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// output
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var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
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@Published var root: StatusItem.Thread?
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@Published var threadContext: ThreadContext?
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@Published var hasPendingStatusEditReload = false
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private(set) lazy var loadThreadStateMachine: GKStateMachine = {
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let stateMachine = GKStateMachine(states: [
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LoadThreadState.Initial(viewModel: self),
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LoadThreadState.Loading(viewModel: self),
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LoadThreadState.Fail(viewModel: self),
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LoadThreadState.NoMore(viewModel: self),
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])
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stateMachine.enter(LoadThreadState.Initial.self)
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return stateMachine
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}()
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@Published var navigationBarTitle: MastodonMetaContent?
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init(
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context: AppContext,
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authContext: AuthContext,
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optionalRoot: StatusItem.Thread?
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) {
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self.context = context
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self.authContext = authContext
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self.root = optionalRoot
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self.mastodonStatusThreadViewModel = MastodonStatusThreadViewModel(context: context)
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// end init
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ManagedObjectObserver.observe(context: context.managedObjectContext)
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.sink(receiveCompletion: { completion in
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// do nohting
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}, receiveValue: { [weak self] changes in
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guard let self = self else { return }
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let objectIDs: [NSManagedObjectID] = changes.changeTypes.compactMap { changeType in
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guard case let .delete(object) = changeType else { return nil }
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return object.objectID
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}
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self.delete(objectIDs: objectIDs)
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})
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.store(in: &disposeBag)
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$root
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.receive(on: DispatchQueue.main)
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.sink { [weak self] root in
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guard let self = self else { return }
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guard case let .root(threadContext) = root else { return }
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guard let status = threadContext.status.object(in: self.context.managedObjectContext) else { return }
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// bind threadContext
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self.threadContext = .init(
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domain: status.domain,
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statusID: status.id,
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replyToID: status.inReplyToID
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)
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// bind titleView
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self.navigationBarTitle = {
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let title = L10n.Scene.Thread.title(status.author.displayNameWithFallback)
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let content = MastodonContent(content: title, emojis: status.author.emojis.asDictionary)
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return try? MastodonMetaContent.convert(document: content)
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}()
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}
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.store(in: &disposeBag)
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context.publisherService
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.statusPublishResult
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.sink { [weak self] value in
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if case let Result.success(result) = value, case StatusPublishResult.edit = result {
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self?.hasPendingStatusEditReload = true
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}
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}
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.store(in: &disposeBag)
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}
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deinit {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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extension ThreadViewModel {
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struct ThreadContext {
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let domain: String
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let statusID: Mastodon.Entity.Status.ID
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let replyToID: Mastodon.Entity.Status.ID?
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}
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}
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extension ThreadViewModel {
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func delete(objectIDs: [NSManagedObjectID]) {
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if let root = self.root,
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case let .root(threadContext) = root,
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objectIDs.contains(threadContext.status.objectID)
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{
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self.root = nil
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}
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self.mastodonStatusThreadViewModel.delete(objectIDs: objectIDs)
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}
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}
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