mastodon-ios/Mastodon/Scene/Profile/Follower/FollowerListViewModel+State...

200 lines
6.8 KiB
Swift

//
// FollowerListViewModel+State.swift
// Mastodon
//
// Created by Cirno MainasuK on 2021-11-1.
//
import os.log
import Foundation
import GameplayKit
import MastodonSDK
import MastodonCore
extension FollowerListViewModel {
class State: GKState {
let logger = Logger(subsystem: "FollowerListViewModel.State", category: "StateMachine")
let id = UUID()
var name: String {
String(describing: Self.self)
}
weak var viewModel: FollowerListViewModel?
init(viewModel: FollowerListViewModel) {
self.viewModel = viewModel
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
let from = previousState.flatMap { String(describing: $0) } ?? "nil"
let to = String(describing: self)
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(from) -> \(to)")
}
@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)] \(String(describing: self))")
}
}
}
extension FollowerListViewModel.State {
class Initial: FollowerListViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
guard let viewModel = viewModel else { return false }
switch stateClass {
case is Reloading.Type:
return viewModel.userID != nil
default:
return false
}
}
}
class Reloading: FollowerListViewModel.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 }
// reset
viewModel.userFetchedResultsController.userIDs = []
stateMachine.enter(Loading.self)
}
}
class Fail: FollowerListViewModel.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: FollowerListViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
switch stateClass {
case is Reloading.Type, is Loading.Type:
return true
default:
return false
}
}
}
class Loading: FollowerListViewModel.State {
var maxID: String?
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)
if previousState is Reloading {
maxID = nil
}
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
guard let userID = viewModel.userID, !userID.isEmpty else {
stateMachine.enter(Fail.self)
return
}
Task {
do {
let response = try await viewModel.context.apiService.followers(
userID: userID,
maxID: maxID,
authenticationBox: viewModel.authContext.mastodonAuthenticationBox
)
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch \(response.value.count) followers")
var hasNewAppend = false
var userIDs = viewModel.userFetchedResultsController.userIDs
for user in response.value {
guard !userIDs.contains(user.id) else { continue }
userIDs.append(user.id)
hasNewAppend = true
}
let maxID = response.link?.maxID
if hasNewAppend && maxID != nil {
await enter(state: Idle.self)
} else {
await enter(state: NoMore.self)
}
self.maxID = maxID
viewModel.userFetchedResultsController.userIDs = userIDs
} catch {
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch follower fail: \(error.localizedDescription)")
await enter(state: Fail.self)
}
} // end Task
} // end func didEnter
}
class NoMore: FollowerListViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
switch stateClass {
case is Reloading.Type:
return true
default:
return false
}
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
}
}
}