105 lines
4.3 KiB
Swift
105 lines
4.3 KiB
Swift
//
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// HashtagTimelineViewModel+LoadLatestState.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 GameplayKit
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import CoreData
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import CoreDataStack
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import MastodonSDK
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extension HashtagTimelineViewModel {
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class LoadLatestState: GKState {
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weak var viewModel: HashtagTimelineViewModel?
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init(viewModel: HashtagTimelineViewModel) {
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self.viewModel = viewModel
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}
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override func didEnter(from previousState: GKState?) {
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os_log("%{public}s[%{public}ld], %{public}s: enter %s, previous: %s", ((#file as NSString).lastPathComponent), #line, #function, self.debugDescription, previousState.debugDescription)
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viewModel?.loadLatestStateMachinePublisher.send(self)
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}
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}
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}
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extension HashtagTimelineViewModel.LoadLatestState {
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class Initial: HashtagTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self
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}
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}
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class Loading: HashtagTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Fail.self || stateClass == Idle.self
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
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guard let activeMastodonAuthenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
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// sign out when loading will enter here
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stateMachine.enter(Fail.self)
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return
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}
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// TODO: only set large count when using Wi-Fi
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viewModel.context.apiService.hashtagTimeline(
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domain: activeMastodonAuthenticationBox.domain,
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hashtag: viewModel.hashtag,
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authorizationBox: activeMastodonAuthenticationBox)
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.receive(on: DispatchQueue.main)
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.sink { completion in
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switch completion {
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case .failure(let error):
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// TODO: handle error
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viewModel.isFetchingLatestTimeline.value = false
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: fetch statues failed. %s", ((#file as NSString).lastPathComponent), #line, #function, error.localizedDescription)
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case .finished:
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// handle isFetchingLatestTimeline in fetch controller delegate
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break
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}
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stateMachine.enter(Idle.self)
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} receiveValue: { response in
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let newStatusIDList = response.value.map { $0.id }
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// When response data:
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// 1. is not empty
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// 2. last status are not recorded
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// Then we may have middle data to load
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var oldStatusIDs = viewModel.fetchedResultsController.statusIDs.value
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if !oldStatusIDs.isEmpty, let lastNewStatusID = newStatusIDList.last,
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!oldStatusIDs.contains(lastNewStatusID) {
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viewModel.needLoadMiddleIndex = (newStatusIDList.count - 1)
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} else {
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viewModel.needLoadMiddleIndex = nil
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}
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oldStatusIDs.insert(contentsOf: newStatusIDList, at: 0)
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let newIDs = oldStatusIDs.removingDuplicates()
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viewModel.fetchedResultsController.statusIDs.value = newIDs
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}
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.store(in: &viewModel.disposeBag)
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}
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}
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class Fail: HashtagTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self || stateClass == Idle.self
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}
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}
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class Idle: HashtagTimelineViewModel.LoadLatestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Loading.self
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}
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}
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}
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