77 lines
2.3 KiB
Swift
77 lines
2.3 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 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 MastodonCore
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final class HashtagTimelineViewModel {
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let logger = Logger(subsystem: "HashtagTimelineViewModel", category: "ViewModel")
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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 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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// 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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lazy var loadOldestStateMachinePublisher = CurrentValueSubject<State?, Never>(nil)
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init(context: AppContext, hashtag: String) {
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self.context = context
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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: nil,
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additionalTweetPredicate: nil
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)
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// end init
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context.authenticationService.activeMastodonAuthenticationBox
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.map { $0?.domain }
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.assign(to: \.domain, on: fetchedResultsController)
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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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