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LearnManager.swift
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/
LearnManager.swift
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//
// LearnManager.swift
// FlashSpeak
//
// Created by Denis Dmitriev on 04.05.2023.
//
import UIKit
import Combine
import AVFoundation
protocol LearnManagerDelegate: AnyObject {
/// Question session end event
func complete(learn: Learn, mistakes: [Word: String])
/// Send to delegate next exercise
func receive(exercise: Exercise)
/// Activity indicator for wait image loader
func spinner(isActive: Bool, title: String?)
/// Configure Mode
func timer(mode: LearnTimer.Timer, seconds: Int?)
/// Configure speaker
func speaker(mode: LearnSpeaker.Speaker)
}
class LearnManager {
// MARK: - Propetes
/// Exercise queue
var exercises = [Exercise]()
weak var delegate: LearnManagerDelegate?
var settingsManager: LearnSettingsManager
private let synthesizer = AVSpeechSynthesizer()
// MARK: - Private propetes
/// Current exercise
private var current: Exercise
/// Сaretaker for learn session result
private var learnCaretaker: LearnCaretaker
/// Caretaker for word answer result
private var wordCaretaker: WordCaretaker
private var store = Set<AnyCancellable>()
/// Exercise publisher
private let exerciseSubject = PassthroughSubject<Exercise, LearnManagerError>()
private let addImageFlag: Bool
/// Creator for questions queue by strategy
private var questionsStrategy: any QuestionsStrategy {
switch settingsManager.questionAdapter {
case .word:
return WordQuestionsStrategy()
case .image:
return ImageQuestionsStrategy()
case .wordImage:
return WordImageQuestionsStrategy()
}
}
/// Creator for answers queue by strategy
private var answerStrategy: any AnswerStrategy {
switch settingsManager.answer {
case .test:
return TestAnswerStrategy()
case .keyboard:
return KeyboardAnswerStrategy()
}
}
// MARK: - Constraction
init(words: [Word], listID: UUID, addImageFlag: Bool) {
self.settingsManager = LearnSettingsManager(wordsCount: words.count)
self.learnCaretaker = LearnCaretaker(wordsCount: words.count, listID: listID)
self.wordCaretaker = WordCaretaker(words: words)
self.addImageFlag = addImageFlag
self.current = Exercise(
word: Word(source: "", translation: ""),
question: Question(question: ""),
answer: TestAnswer(words: [])
)
createExercises(words: words)
subscribe()
}
// MARK: - Private Functions
/// Publisher for queue
private func subscribe() {
exerciseSubject
.receive(on: RunLoop.main)
.sink { completion in
switch completion {
case .finished:
self.wordCaretaker.finish()
self.learnCaretaker.finish()
self.delegate?.complete(
learn: self.learnCaretaker.learn,
mistakes: self.wordCaretaker.mistakeWords
)
case .failure(let error):
print(error.localizedDescription)
}
} receiveValue: { exercise in
self.delegate?.receive( exercise: exercise)
}
.store(in: &store)
}
private func publish() {
if
addImageFlag,
settingsManager.questionAdapter != .word,
current.question.image == nil
{
let title = NSLocalizedString("Image loading", comment: "Title")
delegate?.spinner(isActive: true, title: title)
loadImage(for: current.word)
.receive(on: RunLoop.main)
.sink { completion in
switch completion {
case .finished:
self.delegate?.spinner(isActive: false, title: nil)
self.exerciseSubject.send(self.current)
}
} receiveValue: { image in
self.current.question.image = image
}
.store(in: &store)
} else {
exerciseSubject.send(current)
}
}
private func createExercises(words: [Word]) {
let wordsSequence = words.shuffled()
let questions = createQuestions(words: wordsSequence)
let answers = createAnswers(words: wordsSequence)
wordsSequence
.enumerated()
.publisher
.map { index, word in
let exercise = Exercise(
word: word,
question: questions[index],
answer: answers[index]
)
return exercise
}
.sink(receiveCompletion: { completion in
switch completion {
case .finished:
self.current = self.exercises.first ?? self.exercises[.zero]
case .failure(let error):
print(error.localizedDescription)
}
}, receiveValue: { exercise in
self.exercises.append(exercise)
})
.store(in: &store)
}
private func createQuestions(words: [Word]) -> [Question] {
let questions = questionsStrategy.createQuestions(words, source: settingsManager.language)
return questions
}
private func createAnswers(words: [Word]) -> [Answer] {
let answers = answerStrategy.createAnswers(words, source: settingsManager.language)
return answers
}
private func configureMode(timer: LearnTimer.Timer, sound: LearnSpeaker.Speaker) {
let seconds = settingsManager.settings[.mode]?.first?.value
delegate?.timer(mode: timer, seconds: seconds)
delegate?.speaker(mode: sound)
}
private func rightAnswer() -> String {
switch settingsManager.language {
case .source:
return current.word.translation
case .target:
return current.word.source
}
}
private func cardIndex(_ exercise: Exercise) -> CardIndex {
let currentIndex = exercises.firstIndex { $0.word.id == exercise.word.id } ?? .zero
var allIndexes = exercises.count
// If suddenly get 0
if allIndexes == .zero {
allIndexes = 1
}
return CardIndex(current: currentIndex, count: allIndexes)
}
private func loadImage(for word: Word) -> AnyPublisher<UIImage?, Never> {
return Just(word.imageURL)
.flatMap({ imageURL -> AnyPublisher<UIImage?, Never> in
guard
let url = imageURL
else {
return Just(UIImage(named: "placeholder"))
.eraseToAnyPublisher()
}
return ImageLoader.shared.loadImage(from: url)
})
.eraseToAnyPublisher()
}
// MARK: - Functions
func start() {
configureMode(timer: settingsManager.timer, sound: settingsManager.sound)
publish()
}
func next() {
guard
current.word.id != exercises.last?.word.id,
let currentIndex = exercises.firstIndex(where: { $0.word.id == current.word.id })
else {
exerciseSubject.send(completion: .finished)
return
}
let nextIndex = exercises.index(after: currentIndex)
current = exercises[nextIndex]
publish()
}
func over() {
exerciseSubject.send(completion: .finished)
}
func response(userAnswer: Answer, comletion: @escaping ((Bool, Int) -> Void)) {
let rightAnswer = rightAnswer()
let isRight: Bool
if rightAnswer == userAnswer.answer {
isRight = true
} else {
isRight = false
}
wordCaretaker.addResult(answer: isRight, for: current.word.id, mistake: userAnswer.answer ?? "")
learnCaretaker.addResult(answer: isRight)
let currentIndex = exercises.firstIndex { current.word.id == $0.word.id } ?? .zero
comletion(isRight, currentIndex)
}
func speech() {
// Speech text
let text = current.question.question
// Create an utterance.
let utterance = AVSpeechUtterance(string: text)
// Configure the utterance.
utterance.rate = 0.4
utterance.pitchMultiplier = 0.8
utterance.postUtteranceDelay = 0.2
utterance.volume = 0.8
// Retrieve voice bu setting language
let languageCode = UserDefaultsHelper.targetLanguage
guard let language = Language.language(by: languageCode) else { return }
let voice = AVSpeechSynthesisVoice(language: language.speechVoice)
// Assign the voice to the utterance.
utterance.voice = voice
synthesizer.speak(utterance)
}
// MARK: Test answer method
func rightIndexTest() -> Int? {
let rightAnswer = rightAnswer()
guard let testAnswer = current.answer as? TestAnswer else { return nil }
let index = testAnswer.words.firstIndex { $0.lowercased() == rightAnswer.lowercased() }
return index
}
func indexTest(userAnswer: Answer) -> Int? {
guard let answer = userAnswer as? TestAnswer else { return nil }
let index = answer.words.firstIndex { $0.lowercased() == answer.answer?.lowercased() }
return index
}
}