2021-02-02 12:04:24 +01:00
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//
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// PublicTimelineViewModel+State.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/2/2.
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//
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import Foundation
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import GameplayKit
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import MastodonSDK
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import os.log
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extension PublicTimelineViewModel {
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class State: GKState {
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weak var viewModel: PublicTimelineViewModel?
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init(viewModel: PublicTimelineViewModel) {
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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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}
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}
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}
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extension PublicTimelineViewModel.State {
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class Initial: PublicTimelineViewModel.State {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Loading.Type:
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return true
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default:
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return false
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}
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}
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}
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class Loading: PublicTimelineViewModel.State {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Fail.Type:
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return true
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case is Idle.Type:
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return true
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default:
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return false
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}
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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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viewModel.fetchLatest()
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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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os_log("%{public}s[%{public}ld], %{public}s: fetch user timeline latest response error: %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
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stateMachine.enter(Fail.self)
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case .finished:
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break
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}
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} receiveValue: { response in
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viewModel.isFetchingLatestTimeline.value = false
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let tootsIDs = response.value.map { $0.id }
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viewModel.tootIDs.value = tootsIDs
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stateMachine.enter(Idle.self)
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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: PublicTimelineViewModel.State {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Loading.Type, is LoadingMore.Type:
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return true
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default:
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return false
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}
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}
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}
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class Idle: PublicTimelineViewModel.State {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Loading.Type, is LoadingMore.Type:
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return true
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default:
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return false
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}
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}
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}
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class LoadingMore: PublicTimelineViewModel.State {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Fail.Type:
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return true
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case is Idle.Type:
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return true
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default:
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return false
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}
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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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viewModel.loadMore()
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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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stateMachine.enter(Fail.self)
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os_log("%{public}s[%{public}ld], %{public}s: load more fail: %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
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case .finished:
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break
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}
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} receiveValue: { response in
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stateMachine.enter(Idle.self)
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2021-02-03 06:01:50 +01:00
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var oldTootsIDs = viewModel.tootIDs.value
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for toot in response.value {
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if !oldTootsIDs.contains(toot.id) {
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oldTootsIDs.append(toot.id)
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}
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}
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viewModel.tootIDs.value = oldTootsIDs
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2021-02-02 12:04:24 +01:00
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}
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.store(in: &viewModel.disposeBag)
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}
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}
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}
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