mastodon-ios/MastodonSDK/Sources/MastodonUI/Scene/ComposeContent/AutoComplete/AutoCompleteViewModel+State...

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//
// AutoCompleteViewModel+State.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-5-17.
//
import os.log
import Foundation
import GameplayKit
import MastodonSDK
import MastodonCore
extension AutoCompleteViewModel {
class State: GKState {
let logger = Logger(subsystem: "AutoCompleteViewModel.State", category: "StateMachine")
let id = UUID()
weak var viewModel: AutoCompleteViewModel?
init(viewModel: AutoCompleteViewModel) {
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 AutoCompleteViewModel.State {
class Initial: AutoCompleteViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
guard let viewModel = viewModel else { return false }
switch stateClass {
case is Loading.Type:
return !viewModel.inputText.value.isEmpty
default:
return false
}
}
}
class Loading: AutoCompleteViewModel.State {
var previoursSearchText = ""
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
guard let viewModel = viewModel else { return false }
switch stateClass {
case is Loading.Type:
return previoursSearchText != viewModel.inputText.value
case is Fail.Type:
return true
case is Idle.Type:
return true
default:
return false
}
}
override func didEnter(from previousState: GKState?) {
super.didEnter(from: previousState)
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guard let viewModel = viewModel, let _ = stateMachine else { return }
let searchText = viewModel.inputText.value
let searchType = AutoCompleteViewModel.SearchType(inputText: searchText) ?? .default
if searchText != previoursSearchText {
reset(searchText: searchText)
}
switch searchType {
case .emoji:
Task {
await fetchLocalEmoji(searchText: searchText)
}
default:
Task {
await queryRemoteEnitity(searchText: searchText)
}
}
}
private func fetchLocalEmoji(searchText: String) async {
guard let viewModel = viewModel else {
await enter(state: Fail.self)
return
}
guard let customEmojiViewModel = viewModel.customEmojiViewModel else {
await enter(state: Fail.self)
return
}
guard let emojiTrie = customEmojiViewModel.emojiTrie.value else {
await enter(state: Fail.self)
return
}
let searchPattern = ArraySlice(String(searchText.dropFirst()))
let passthroughs = emojiTrie.passthrough(searchPattern)
let matchingEmojis = passthroughs
.map { $0.values } // [Set<Emoji>]
.map { set in set.compactMap { $0 as? Mastodon.Entity.Emoji } } // [[Emoji]]
.flatMap { $0 } // [Emoji]
let items: [AutoCompleteItem] = matchingEmojis.map { emoji in
AutoCompleteItem.emoji(emoji: emoji)
}
await enter(state: Idle.self)
viewModel.autoCompleteItems.value = items
}
private func queryRemoteEnitity(searchText: String) async {
guard let viewModel = viewModel else {
await enter(state: Fail.self)
return
}
let searchText = viewModel.inputText.value
let searchType = AutoCompleteViewModel.SearchType(inputText: searchText) ?? .default
let q = String(searchText.dropFirst())
let query = Mastodon.API.V2.Search.Query(
q: q,
type: searchType.mastodonSearchType,
maxID: nil,
offset: nil,
following: nil
)
do {
let response = try await viewModel.context.apiService.search(
query: query,
authenticationBox: viewModel.authContext.mastodonAuthenticationBox
)
await enter(state: Idle.self)
guard viewModel.inputText.value == searchText else { return } // discard if not matching
var items: [AutoCompleteItem] = []
items.append(contentsOf: response.value.accounts.map { AutoCompleteItem.account(account: $0) })
items.append(contentsOf: response.value.hashtags.map { AutoCompleteItem.hashtag(tag: $0) })
viewModel.autoCompleteItems.value = items
} catch {
logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): auto-complete fail: \(error.localizedDescription)")
await enter(state: Fail.self)
}
}
private func reset(searchText: String) {
let previoursSearchType = AutoCompleteViewModel.SearchType(inputText: previoursSearchText)
previoursSearchText = searchText
let currentSearchType = AutoCompleteViewModel.SearchType(inputText: searchText)
// reset when search type change
if previoursSearchType != currentSearchType {
viewModel?.autoCompleteItems.value = []
}
}
}
class Idle: AutoCompleteViewModel.State {
override func isValidNextState(_ stateClass: AnyClass) -> Bool {
switch stateClass {
case is Loading.Type:
return true
default:
return false
}
}
}
class Fail: AutoCompleteViewModel.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)
}
}
}
}