mastodon-ios/Mastodon/Scene/HomeTimeline/HomeTimelineViewModel+LoadL...

133 lines
4.7 KiB
Swift

//
// HomeTimelineViewModel+LoadLatestState.swift
// Mastodon
//
// Created by sxiaojian on 2021/2/5.
//
import func QuartzCore.CACurrentMediaTime
import Foundation
import CoreData
import CoreDataStack
import GameplayKit
import MastodonCore
extension HomeTimelineViewModel {
class LoadLatestState: GKState {
let id = UUID()
var name: String {
String(describing: Self.self)
}
weak var viewModel: HomeTimelineViewModel?
init(viewModel: HomeTimelineViewModel) {
self.viewModel = viewModel
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
viewModel?.loadLatestStateMachinePublisher.send(self)
}
@MainActor
func enter(state: LoadLatestState.Type) {
stateMachine?.enter(state)
}
}
}
extension HomeTimelineViewModel.LoadLatestState {
class Initial: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self || stateClass == LoadingManually.self
}
}
class Loading: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Fail.self || stateClass == Idle.self
}
override func didEnter(from previousState: GKState?) {
didEnter(from: previousState, viewModel: viewModel, isUserInitiated: false)
}
}
class LoadingManually: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Fail.self || stateClass == Idle.self
}
override func didEnter(from previousState: GKState?) {
didEnter(from: previousState, viewModel: viewModel, isUserInitiated: true)
}
}
class Fail: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self || stateClass == Idle.self
}
}
class Idle: HomeTimelineViewModel.LoadLatestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self || stateClass == LoadingManually.self
}
}
private func didEnter(from previousState: GKState?, viewModel: HomeTimelineViewModel?, isUserInitiated: Bool) {
super.didEnter(from: previousState)
guard let viewModel else { return }
let latestFeedRecords = viewModel.fetchedResultsController.records.prefix(APIService.onceRequestStatusMaxCount)
let parentManagedObjectContext = viewModel.fetchedResultsController.managedObjectContext
let managedObjectContext = NSManagedObjectContext(concurrencyType: .privateQueueConcurrencyType)
managedObjectContext.parent = parentManagedObjectContext
Task {
let latestStatusIDs: [Status.ID] = latestFeedRecords.compactMap { record in
guard let feed = record.object(in: managedObjectContext) else { return nil }
return feed.status?.id
}
do {
let response = try await viewModel.context.apiService.homeTimeline(
authenticationBox: viewModel.authContext.mastodonAuthenticationBox
)
await enter(state: Idle.self)
viewModel.homeTimelineNavigationBarTitleViewModel.receiveLoadingStateCompletion(.finished)
viewModel.context.instanceService.updateMutesAndBlocks()
// stop refresher if no new statuses
let statuses = response.value
let newStatuses = statuses.filter { !latestStatusIDs.contains($0.id) }
if newStatuses.isEmpty {
viewModel.didLoadLatest.send()
} else {
if !latestStatusIDs.isEmpty {
viewModel.homeTimelineNavigationBarTitleViewModel.newPostsIncoming()
}
}
viewModel.timelineIsEmpty.value = latestStatusIDs.isEmpty && statuses.isEmpty
if !isUserInitiated {
await UIImpactFeedbackGenerator(style: .light)
.impactOccurred()
}
} catch {
await enter(state: Idle.self)
viewModel.didLoadLatest.send()
viewModel.homeTimelineNavigationBarTitleViewModel.receiveLoadingStateCompletion(.failure(error))
}
} // end Task
}
}