mastodon-ios/Mastodon/Scene/Discovery/Community/DiscoveryCommunityViewModel...

200 lines
6.9 KiB
Swift

//
// DiscoveryCommunityViewModel+State.swift
// Mastodon
//
// Created by MainasuK on 2022-4-29.
//
import os.log
import Foundation
import GameplayKit
import MastodonSDK
extension DiscoveryCommunityViewModel {
class State: GKState {
let logger = Logger(subsystem: "DiscoveryCommunityViewModel.State", category: "StateMachine")
let id = UUID()
weak var viewModel: DiscoveryCommunityViewModel?
init(viewModel: DiscoveryCommunityViewModel) {
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 DiscoveryCommunityViewModel.State {
class Initial: DiscoveryCommunityViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
switch stateClass {
case is Reloading.Type:
return true
default:
return false
}
}
}
class Reloading: DiscoveryCommunityViewModel.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 }
stateMachine.enter(Loading.self)
}
}
class Fail: DiscoveryCommunityViewModel.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: DiscoveryCommunityViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
switch stateClass {
case is Reloading.Type, is Loading.Type:
return true
default:
return false
}
}
}
class Loading: DiscoveryCommunityViewModel.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)
guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
switch previousState {
case is Reloading:
maxID = nil
default:
break
}
let maxID = self.maxID
let isReloading = maxID == nil
Task {
do {
let response = try await viewModel.context.apiService.publicTimeline(
query: .init(
local: true,
remote: nil,
onlyMedia: nil,
maxID: maxID,
sinceID: nil,
minID: nil,
limit: 20
),
authenticationBox: viewModel.authContext.mastodonAuthenticationBox
)
let newMaxID = response.link?.maxID
let hasMore = newMaxID != nil
self.maxID = newMaxID
var hasNewStatusesAppend = false
var statusIDs = isReloading ? [] : viewModel.statusFetchedResultsController.statusIDs
for status in response.value {
guard !statusIDs.contains(status.id) else { continue }
statusIDs.append(status.id)
hasNewStatusesAppend = true
}
if hasNewStatusesAppend, hasMore {
self.maxID = response.link?.maxID
await enter(state: Idle.self)
} else {
await enter(state: NoMore.self)
}
viewModel.statusFetchedResultsController.statusIDs = statusIDs
viewModel.didLoadLatest.send()
} catch {
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch user timeline fail: \(error.localizedDescription)")
await enter(state: Fail.self)
}
} // end Task
} // end func
}
class NoMore: DiscoveryCommunityViewModel.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)
}
}
}