218 lines
7.6 KiB
Swift
218 lines
7.6 KiB
Swift
//
|
|
// HashtagTimelineViewModel+State.swift
|
|
// Mastodon
|
|
//
|
|
// Created by BradGao on 2021/3/31.
|
|
//
|
|
|
|
import os.log
|
|
import Foundation
|
|
import GameplayKit
|
|
import CoreDataStack
|
|
|
|
extension HashtagTimelineViewModel {
|
|
class State: GKState, NamingState {
|
|
|
|
let logger = Logger(subsystem: "HashtagTimelineViewModel.LoadOldestState", category: "StateMachine")
|
|
|
|
let id = UUID()
|
|
|
|
var name: String {
|
|
String(describing: Self.self)
|
|
}
|
|
|
|
weak var viewModel: HashtagTimelineViewModel?
|
|
|
|
init(viewModel: HashtagTimelineViewModel) {
|
|
self.viewModel = viewModel
|
|
}
|
|
|
|
override func didEnter(from previousState: GKState?) {
|
|
let previousState = previousState as? HashtagTimelineViewModel.State
|
|
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>")")
|
|
|
|
viewModel?.loadOldestStateMachinePublisher.send(self)
|
|
}
|
|
|
|
@MainActor
|
|
func enter(state: State.Type) {
|
|
stateMachine?.enter(state)
|
|
}
|
|
|
|
deinit {
|
|
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(self.name)")
|
|
}
|
|
}
|
|
}
|
|
|
|
extension HashtagTimelineViewModel.State {
|
|
class Initial: HashtagTimelineViewModel.State {
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Reloading.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
|
|
class Reloading: HashtagTimelineViewModel.State {
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Loading.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
override func didEnter(from previousState: GKState?) {
|
|
super.didEnter(from: previousState)
|
|
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
|
|
|
|
stateMachine.enter(Loading.self)
|
|
}
|
|
}
|
|
|
|
class Fail: HashtagTimelineViewModel.State {
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Loading.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
override func didEnter(from previousState: GKState?) {
|
|
super.didEnter(from: previousState)
|
|
guard let _ = viewModel, let stateMachine = stateMachine else { return }
|
|
|
|
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading 3s later…", ((#file as NSString).lastPathComponent), #line, #function)
|
|
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
|
|
os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: retry loading", ((#file as NSString).lastPathComponent), #line, #function)
|
|
stateMachine.enter(Loading.self)
|
|
}
|
|
}
|
|
}
|
|
|
|
class Idle: HashtagTimelineViewModel.State {
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Reloading.Type, is Loading.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
|
|
class Loading: HashtagTimelineViewModel.State {
|
|
var maxID: Status.ID?
|
|
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Fail.Type:
|
|
return true
|
|
case is Idle.Type:
|
|
return true
|
|
case is NoMore.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
override func didEnter(from previousState: GKState?) {
|
|
super.didEnter(from: previousState)
|
|
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
|
|
|
|
switch previousState {
|
|
case is Reloading:
|
|
maxID = nil
|
|
default:
|
|
break
|
|
}
|
|
|
|
guard let authenticationBox = viewModel.context.authenticationService.activeMastodonAuthenticationBox.value else {
|
|
assertionFailure()
|
|
stateMachine.enter(Fail.self)
|
|
return
|
|
}
|
|
|
|
// TODO: only set large count when using Wi-Fi
|
|
let maxID = self.maxID
|
|
let isReloading = maxID == nil
|
|
|
|
Task {
|
|
do {
|
|
let response = try await viewModel.context.apiService.hashtagTimeline(
|
|
domain: authenticationBox.domain,
|
|
maxID: maxID,
|
|
hashtag: viewModel.hashtag,
|
|
authenticationBox: authenticationBox
|
|
)
|
|
|
|
let newMaxID: String? = {
|
|
guard let maxID = response.link?.maxID else { return nil }
|
|
return maxID
|
|
}()
|
|
|
|
let hasMore: Bool = {
|
|
guard let newMaxID = newMaxID else { return false }
|
|
return newMaxID != maxID
|
|
}()
|
|
|
|
self.maxID = newMaxID
|
|
|
|
var hasNewStatusesAppend = false
|
|
var statusIDs = isReloading ? [] : viewModel.fetchedResultsController.statusIDs.value
|
|
for status in response.value {
|
|
guard !statusIDs.contains(status.id) else { continue }
|
|
statusIDs.append(status.id)
|
|
hasNewStatusesAppend = true
|
|
}
|
|
|
|
if hasNewStatusesAppend, hasMore {
|
|
await enter(state: Idle.self)
|
|
} else {
|
|
await enter(state: NoMore.self)
|
|
}
|
|
|
|
viewModel.fetchedResultsController.append(statusIDs: statusIDs)
|
|
viewModel.didLoadLatest.send()
|
|
} catch {
|
|
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch statues failed: \(error.localizedDescription)")
|
|
await enter(state: Fail.self)
|
|
}
|
|
} // end Task
|
|
}
|
|
}
|
|
|
|
class NoMore: HashtagTimelineViewModel.State {
|
|
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
|
|
switch stateClass {
|
|
case is Reloading.Type:
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
override func didEnter(from previousState: GKState?) {
|
|
guard let viewModel = viewModel else { return }
|
|
guard let diffableDataSource = viewModel.diffableDataSource else {
|
|
assertionFailure()
|
|
return
|
|
}
|
|
DispatchQueue.main.async {
|
|
var snapshot = diffableDataSource.snapshot()
|
|
snapshot.deleteItems([.bottomLoader])
|
|
diffableDataSource.apply(snapshot)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|