forked from zelo72/mastodon-ios
140 lines
5.1 KiB
Swift
140 lines
5.1 KiB
Swift
//
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// HashtagTimelineViewModel+LoadOldestState.swift
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// Mastodon
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//
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// Created by BradGao on 2021/3/31.
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//
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import os.log
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import Foundation
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import GameplayKit
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import CoreDataStack
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extension HashtagTimelineViewModel {
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class LoadOldestState: GKState, NamingState {
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let logger = Logger(subsystem: "HashtagTimelineViewModel.LoadOldestState", category: "StateMachine")
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let id = UUID()
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var name: String {
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String(describing: Self.self)
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}
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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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let previousState = previousState as? HashtagTimelineViewModel.LoadOldestState
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] enter \(self.name), previous: \(previousState?.name ?? "<nil>")")
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viewModel?.loadOldestStateMachinePublisher.send(self)
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}
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@MainActor
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func enter(state: LoadOldestState.Type) {
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stateMachine?.enter(state)
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}
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deinit {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(self.name)")
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}
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}
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}
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extension HashtagTimelineViewModel.LoadOldestState {
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class Initial: HashtagTimelineViewModel.LoadOldestState {
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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.LoadOldestState {
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var maxID: Status.ID?
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return stateClass == Fail.self || stateClass == Idle.self || stateClass == NoMore.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 authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
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assertionFailure()
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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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let maxID = self.maxID
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Task {
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do {
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let response = try await viewModel.context.apiService.hashtagTimeline(
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domain: authenticationBox.domain,
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maxID: maxID,
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hashtag: viewModel.hashtag,
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authenticationBox: authenticationBox
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)
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var hasMore = false
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if let _maxID = response.link?.maxID,
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_maxID != maxID
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{
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self.maxID = _maxID
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hasMore = true
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}
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if hasMore {
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await enter(state: Idle.self)
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} else {
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await enter(state: NoMore.self)
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}
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let statusIDs = response.value.map { $0.id }
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viewModel.fetchedResultsController.append(statusIDs: statusIDs)
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} catch {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch statues failed: \(error.localizedDescription)")
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await enter(state: Fail.self)
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}
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} // end Task
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}
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}
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class Fail: HashtagTimelineViewModel.LoadOldestState {
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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.LoadOldestState {
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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 NoMore: HashtagTimelineViewModel.LoadOldestState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return false
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}
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override func didEnter(from previousState: GKState?) {
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guard let viewModel = viewModel else { return }
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guard let diffableDataSource = viewModel.diffableDataSource else {
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assertionFailure()
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return
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}
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DispatchQueue.main.async {
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var snapshot = diffableDataSource.snapshot()
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snapshot.deleteItems([.bottomLoader])
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diffableDataSource.apply(snapshot)
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}
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}
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}
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}
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