forked from zelo72/mastodon-ios
106 lines
4.0 KiB
Swift
106 lines
4.0 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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final class HashtagTimelineViewModel: NSObject {
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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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weak var contentOffsetAdjustableTimelineViewControllerDelegate: ContentOffsetAdjustableTimelineViewControllerDelegate?
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weak var tableView: UITableView?
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// output
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// top loader
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private(set) lazy var loadLatestStateMachine: GKStateMachine = {
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// exclude timeline middle fetcher state
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let stateMachine = GKStateMachine(states: [
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LoadLatestState.Initial(viewModel: self),
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LoadLatestState.Loading(viewModel: self),
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LoadLatestState.Fail(viewModel: self),
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LoadLatestState.Idle(viewModel: self),
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])
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stateMachine.enter(LoadLatestState.Initial.self)
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return stateMachine
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}()
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lazy var loadLatestStateMachinePublisher = CurrentValueSubject<LoadLatestState?, Never>(nil)
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// bottom loader
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private(set) lazy var loadOldestStateMachine: GKStateMachine = {
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// exclude timeline middle fetcher state
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let stateMachine = GKStateMachine(states: [
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LoadOldestState.Initial(viewModel: self),
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LoadOldestState.Loading(viewModel: self),
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LoadOldestState.Fail(viewModel: self),
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LoadOldestState.Idle(viewModel: self),
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LoadOldestState.NoMore(viewModel: self),
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])
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stateMachine.enter(LoadOldestState.Initial.self)
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return stateMachine
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}()
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lazy var loadOldestStateMachinePublisher = CurrentValueSubject<LoadOldestState?, Never>(nil)
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// middle loader
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let loadMiddleSateMachineList = CurrentValueSubject<[NSManagedObjectID: GKStateMachine], Never>([:]) // TimelineIndex.objectID : middle loading state machine
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var diffableDataSource: UITableViewDiffableDataSource<StatusSection, Item>?
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var cellFrameCache = NSCache<NSNumber, NSValue>()
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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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let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value
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self.fetchedResultsController = StatusFetchedResultsController(managedObjectContext: context.managedObjectContext, domain: activeMastodonAuthenticationBox?.domain, additionalTweetPredicate: nil)
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super.init()
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fetchedResultsController.objectIDs
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.receive(on: DispatchQueue.main)
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.sink { [weak self] objectIds in
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self?.generateStatusItems(newObjectIDs: objectIds)
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}
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.store(in: &disposeBag)
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}
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func fetchTag() {
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guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
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return
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}
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let query = Mastodon.API.V2.Search.Query(q: hashtag, type: .hashtags)
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context.apiService.search(domain: activeMastodonAuthenticationBox.domain, query: query, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
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.sink { _ in
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} receiveValue: { [weak self] response in
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let matchedTag = response.value.hashtags.first { tag -> Bool in
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return tag.name == self?.hashtag
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}
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self?.hashtagEntity.send(matchedTag)
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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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