100 lines
4.0 KiB
Swift
100 lines
4.0 KiB
Swift
//
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// ShareViewModel.swift
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// MastodonShareAction
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//
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// Created by MainasuK Cirno on 2021-7-16.
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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 CoreData
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import CoreDataStack
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final class ShareViewModel {
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let logger = Logger(subsystem: "ShareViewModel", category: "logic")
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var disposeBag = Set<AnyCancellable>()
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// input
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let viewDidAppear = CurrentValueSubject<Bool, Never>(false)
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private var coreDataStack: CoreDataStack?
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var managedObjectContext: NSManagedObjectContext?
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// output
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let authentication = CurrentValueSubject<Result<MastodonAuthentication, Error>?, Never>(nil)
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let isFetchAuthentication = CurrentValueSubject<Bool, Never>(true)
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let isBusy = CurrentValueSubject<Bool, Never>(true)
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let isValid = CurrentValueSubject<Bool, Never>(false)
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init() {
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viewDidAppear.receive(on: DispatchQueue.main)
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.removeDuplicates()
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.sink { [weak self] viewDidAppear in
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guard let self = self else { return }
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guard viewDidAppear else { return }
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self.setupCoreData()
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}
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.store(in: &disposeBag)
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authentication
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.map { result in result == nil }
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.assign(to: \.value, on: isFetchAuthentication)
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.store(in: &disposeBag)
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isFetchAuthentication
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.receive(on: DispatchQueue.main)
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.assign(to: \.value, on: isBusy)
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.store(in: &disposeBag)
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}
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}
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extension ShareViewModel {
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enum ShareError: Error {
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case `internal`(error: Error)
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case userCancelShare
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case missingAuthentication
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}
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}
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extension ShareViewModel {
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private func setupCoreData() {
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logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public)")
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DispatchQueue.global().async {
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let _coreDataStack = CoreDataStack()
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self.coreDataStack = _coreDataStack
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self.managedObjectContext = _coreDataStack.persistentContainer.viewContext
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_coreDataStack.didFinishLoad
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.receive(on: RunLoop.main)
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.sink { [weak self] didFinishLoad in
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guard let self = self else { return }
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guard didFinishLoad else { return }
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guard let managedObjectContext = self.managedObjectContext else { return }
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self.logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch authentication…")
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managedObjectContext.perform {
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do {
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let request = MastodonAuthentication.sortedFetchRequest
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let authentications = try managedObjectContext.fetch(request)
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let authentication = authentications.sorted(by: { $0.activedAt > $1.activedAt }).first
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guard let activeAuthentication = authentication else {
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self.authentication.value = .failure(ShareError.missingAuthentication)
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return
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}
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self.authentication.value = .success(activeAuthentication)
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self.logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch authentication success \(activeAuthentication.userID)")
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} catch {
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self.authentication.value = .failure(ShareError.internal(error: error))
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self.logger.debug("\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch authentication fail \(error.localizedDescription)")
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assertionFailure(error.localizedDescription)
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}
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}
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}
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.store(in: &self.disposeBag)
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}
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}
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}
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