137 lines
4.9 KiB
Swift
137 lines
4.9 KiB
Swift
//
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// ThreadViewModel+LoadThreadState.swift
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// Mastodon
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//
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// Created by MainasuK Cirno on 2021-4-12.
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//
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import os.log
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import Foundation
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import Combine
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import GameplayKit
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import CoreDataStack
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import MastodonSDK
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extension ThreadViewModel {
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class LoadThreadState: GKState {
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let logger = Logger(subsystem: "ThreadViewModel.LoadThreadState", category: "StateMachine")
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let id = UUID()
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weak var viewModel: ThreadViewModel?
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init(viewModel: ThreadViewModel) {
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self.viewModel = viewModel
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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let from = previousState.flatMap { String(describing: $0) } ?? "nil"
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let to = String(describing: self)
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): \(from) -> \(to)")
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}
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@MainActor
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func enter(state: LoadThreadState.Type) {
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stateMachine?.enter(state)
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}
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deinit {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): [\(self.id.uuidString)] \(String(describing: self))")
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}
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}
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}
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extension ThreadViewModel.LoadThreadState {
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class Initial: ThreadViewModel.LoadThreadState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Loading.Type: return true
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default: return false
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}
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}
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}
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class Loading: ThreadViewModel.LoadThreadState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Fail.Type: return true
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case is NoMore.Type: return true
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default: return false
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}
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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guard let viewModel = viewModel, let stateMachine = stateMachine else { return }
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guard let threadContext = viewModel.threadContext else {
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stateMachine.enter(Fail.self)
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return
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}
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Task {
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do {
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let response = try await viewModel.context.apiService.statusContext(
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statusID: threadContext.statusID,
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authenticationBox: viewModel.authContext.mastodonAuthenticationBox
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)
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await enter(state: NoMore.self)
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// assert(!Thread.isMainThread)
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// await Task.sleep(1_000_000_000) // 1s delay to prevent UI render issue
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viewModel.mastodonStatusThreadViewModel.appendAncestor(
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domain: threadContext.domain,
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nodes: MastodonStatusThreadViewModel.Node.replyToThread(
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for: threadContext.replyToID,
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from: response.value.ancestors
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)
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)
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viewModel.mastodonStatusThreadViewModel.appendDescendant(
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domain: threadContext.domain,
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nodes: MastodonStatusThreadViewModel.Node.children(
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of: threadContext.statusID,
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from: response.value.descendants
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)
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)
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} catch {
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch status context for \(threadContext.statusID) fail: \(error.localizedDescription)")
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await enter(state: Fail.self)
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}
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}
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}
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}
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class Fail: ThreadViewModel.LoadThreadState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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switch stateClass {
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case is Loading.Type: return true
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default: return false
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}
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}
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override func didEnter(from previousState: GKState?) {
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super.didEnter(from: previousState)
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guard let _ = viewModel, let stateMachine = stateMachine else { return }
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DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
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stateMachine.enter(Loading.self)
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}
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}
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}
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class NoMore: ThreadViewModel.LoadThreadState {
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override func isValidNextState(_ stateClass: AnyClass) -> Bool {
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return false
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}
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}
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}
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