mastodon-ios/Mastodon/Scene/HashtagTimeline/HashtagTimelineViewModel+Lo...

140 lines
5.1 KiB
Swift

//
// HashtagTimelineViewModel+LoadOldestState.swift
// Mastodon
//
// Created by BradGao on 2021/3/31.
//
import os.log
import Foundation
import GameplayKit
import CoreDataStack
extension HashtagTimelineViewModel {
class LoadOldestState: 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.LoadOldestState
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: LoadOldestState.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.LoadOldestState {
class Initial: HashtagTimelineViewModel.LoadOldestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self
}
}
class Loading: HashtagTimelineViewModel.LoadOldestState {
var maxID: Status.ID?
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Fail.self || stateClass == Idle.self || stateClass == NoMore.self
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
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
Task {
do {
let response = try await viewModel.context.apiService.hashtagTimeline(
domain: authenticationBox.domain,
maxID: maxID,
hashtag: viewModel.hashtag,
authenticationBox: authenticationBox
)
var hasMore = false
if let _maxID = response.link?.maxID,
_maxID != maxID
{
self.maxID = _maxID
hasMore = true
}
if hasMore {
await enter(state: Idle.self)
} else {
await enter(state: NoMore.self)
}
let statusIDs = response.value.map { $0.id }
viewModel.fetchedResultsController.append(statusIDs: statusIDs)
} 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 Fail: HashtagTimelineViewModel.LoadOldestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self || stateClass == Idle.self
}
}
class Idle: HashtagTimelineViewModel.LoadOldestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
return stateClass == Loading.self
}
}
class NoMore: HashtagTimelineViewModel.LoadOldestState {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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)
}
}
}
}