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142 lines
5.2 KiB
Swift
142 lines
5.2 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import Combine
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import Foundation
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import Mastodon
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import ServiceLayer
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public final class NewStatusViewModel: ObservableObject {
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@Published public var visibility: Status.Visibility
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@Published public private(set) var compositionViewModels = [CompositionViewModel()]
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@Published public private(set) var identification: Identification
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@Published public private(set) var authenticatedIdentities = [Identity]()
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@Published public var canPost = false
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@Published public var canChangeIdentity = true
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@Published public var alertItem: AlertItem?
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@Published public private(set) var postingState = PostingState.composing
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public let events: AnyPublisher<Event, Never>
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private let allIdentitiesService: AllIdentitiesService
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private let environment: AppEnvironment
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private let eventsSubject = PassthroughSubject<Event, Never>()
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private let itemEventsSubject = PassthroughSubject<CompositionViewModel.Event, Never>()
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private var cancellables = Set<AnyCancellable>()
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public init(allIdentitiesService: AllIdentitiesService,
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identification: Identification,
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environment: AppEnvironment) {
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self.allIdentitiesService = allIdentitiesService
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self.identification = identification
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self.environment = environment
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events = eventsSubject.eraseToAnyPublisher()
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visibility = identification.identity.preferences.postingDefaultVisibility
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allIdentitiesService.authenticatedIdentitiesPublisher()
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.assignErrorsToAlertItem(to: \.alertItem, on: self)
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.assign(to: &$authenticatedIdentities)
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$compositionViewModels.flatMap { Publishers.MergeMany($0.map(\.$isPostable)) }
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.receive(on: DispatchQueue.main) // hack to punt to next run loop, consider refactoring
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.compactMap { [weak self] _ in self?.compositionViewModels.allSatisfy(\.isPostable) }
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.combineLatest($postingState)
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.map { $0 && $1 == .composing }
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.assign(to: &$canPost)
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}
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}
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public extension NewStatusViewModel {
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enum Event {
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case presentMediaPicker(CompositionViewModel)
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case presentCamera(CompositionViewModel)
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}
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enum PostingState {
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case composing
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case posting
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case done
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}
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func setIdentity(_ identity: Identity) {
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let identityService: IdentityService
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do {
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identityService = try allIdentitiesService.identityService(id: identity.id)
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} catch {
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alertItem = AlertItem(error: error)
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return
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}
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identification = Identification(
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identity: identity,
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publisher: identityService.identityPublisher(immediate: false)
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.assignErrorsToAlertItem(to: \.alertItem, on: self),
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service: identityService,
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environment: environment)
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}
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func presentMediaPicker(viewModel: CompositionViewModel) {
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eventsSubject.send(.presentMediaPicker(viewModel))
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}
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func presentCamera(viewModel: CompositionViewModel) {
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eventsSubject.send(.presentCamera(viewModel))
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}
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func insert(after: CompositionViewModel) {
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guard let index = compositionViewModels.firstIndex(where: { $0 === after })
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else { return }
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let newViewModel = CompositionViewModel()
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newViewModel.contentWarning = after.contentWarning
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newViewModel.displayContentWarning = after.displayContentWarning
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if index >= compositionViewModels.count - 1 {
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compositionViewModels.append(newViewModel)
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} else {
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compositionViewModels.insert(newViewModel, at: index + 1)
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}
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}
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func attach(itemProvider: NSItemProvider, to compositionViewModel: CompositionViewModel) {
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compositionViewModel.attach(itemProvider: itemProvider, parentViewModel: self)
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}
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func post() {
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guard let unposted = compositionViewModels.first(where: { !$0.isPosted }) else { return }
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post(viewModel: unposted, inReplyToId: nil)
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}
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}
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private extension NewStatusViewModel {
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func post(viewModel: CompositionViewModel, inReplyToId: Status.Id?) {
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postingState = .posting
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identification.service.post(statusComponents: viewModel.components(
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inReplyToId: inReplyToId,
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visibility: visibility))
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.receive(on: DispatchQueue.main)
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.sink { [weak self] in
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guard let self = self else { return }
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switch $0 {
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case .finished:
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if self.compositionViewModels.allSatisfy(\.isPosted) {
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self.postingState = .done
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}
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case let .failure(error):
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self.alertItem = AlertItem(error: error)
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self.postingState = .composing
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}
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} receiveValue: { [weak self] in
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guard let self = self else { return }
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viewModel.isPosted = true
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if let unposted = self.compositionViewModels.first(where: { !$0.isPosted }) {
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self.post(viewModel: unposted, inReplyToId: $0)
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}
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}
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.store(in: &cancellables)
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}
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}
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