118 lines
3.6 KiB
Swift
118 lines
3.6 KiB
Swift
//
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// HashtagTimelineViewModel.swift
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// Mastodon
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//
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// Created by BradGao on 2021/3/30.
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//
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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 MastodonCore
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final class HashtagTimelineViewModel {
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let hashtag: String
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var disposeBag = Set<AnyCancellable>()
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var needLoadMiddleIndex: Int? = nil
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// input
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let context: AppContext
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let authContext: AuthContext
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let fetchedResultsController: StatusFetchedResultsController
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let isFetchingLatestTimeline = CurrentValueSubject<Bool, Never>(false)
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let timelinePredicate = CurrentValueSubject<NSPredicate?, Never>(nil)
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let hashtagEntity = CurrentValueSubject<Mastodon.Entity.Tag?, Never>(nil)
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let listBatchFetchViewModel = ListBatchFetchViewModel()
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// output
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var diffableDataSource: UITableViewDiffableDataSource<StatusSection, StatusItem>?
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let didLoadLatest = PassthroughSubject<Void, Never>()
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let hashtagDetails = CurrentValueSubject<Mastodon.Entity.Tag?, Never>(nil)
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// bottom loader
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private(set) lazy var stateMachine: GKStateMachine = {
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// exclude timeline middle fetcher state
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let stateMachine = GKStateMachine(states: [
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State.Initial(viewModel: self),
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State.Reloading(viewModel: self),
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State.Fail(viewModel: self),
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State.Idle(viewModel: self),
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State.Loading(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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init(context: AppContext, authContext: AuthContext, hashtag: String) {
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self.context = context
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self.authContext = authContext
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self.hashtag = hashtag
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self.fetchedResultsController = StatusFetchedResultsController(
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managedObjectContext: context.managedObjectContext,
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domain: authContext.mastodonAuthenticationBox.domain,
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additionalTweetPredicate: nil
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)
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updateTagInformation()
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// end init
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}
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func viewWillAppear() {
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let predicate = Tag.predicate(
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domain: authContext.mastodonAuthenticationBox.domain,
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name: hashtag
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)
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guard
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let object = Tag.findOrFetch(in: context.managedObjectContext, matching: predicate)
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else {
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return hashtagDetails.send(hashtagDetails.value?.copy(following: false))
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}
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hashtagDetails.send(hashtagDetails.value?.copy(following: object.following))
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}
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}
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extension HashtagTimelineViewModel {
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func followTag() {
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self.hashtagDetails.send(hashtagDetails.value?.copy(following: true))
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Task { @MainActor in
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let tag = try? await context.apiService.followTag(
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for: hashtag,
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authenticationBox: authContext.mastodonAuthenticationBox
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).value
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self.hashtagDetails.send(tag)
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}
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}
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func unfollowTag() {
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self.hashtagDetails.send(hashtagDetails.value?.copy(following: false))
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Task { @MainActor in
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let tag = try? await context.apiService.unfollowTag(
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for: hashtag,
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authenticationBox: authContext.mastodonAuthenticationBox
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).value
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self.hashtagDetails.send(tag)
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}
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}
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}
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private extension HashtagTimelineViewModel {
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func updateTagInformation() {
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Task { @MainActor in
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let tag = try? await context.apiService.getTagInformation(
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for: hashtag,
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authenticationBox: authContext.mastodonAuthenticationBox
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).value
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self.hashtagDetails.send(tag)
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}
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}
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}
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