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92 lines
3.1 KiB
Swift
92 lines
3.1 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 ExploreViewModel: ObservableObject {
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public let searchViewModel: SearchViewModel
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public let events: AnyPublisher<Event, Never>
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@Published public var instanceViewModel: InstanceViewModel?
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@Published public var trends = [Tag]()
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@Published public private(set) var loading = false
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@Published public var alertItem: AlertItem?
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public let identityContext: IdentityContext
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private let exploreService: ExploreService
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private let eventsSubject = PassthroughSubject<Event, Never>()
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private var cancellables = Set<AnyCancellable>()
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init(service: ExploreService, identityContext: IdentityContext) {
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exploreService = service
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self.identityContext = identityContext
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searchViewModel = SearchViewModel(identityContext: identityContext)
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events = eventsSubject.eraseToAnyPublisher()
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identityContext.$identity
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.compactMap { $0.instance?.uri }
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.removeDuplicates()
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.flatMap { service.instanceServicePublisher(uri: $0) }
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.map { InstanceViewModel(instanceService: $0) }
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.receive(on: DispatchQueue.main)
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.assignErrorsToAlertItem(to: \.alertItem, on: self)
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.assign(to: &$instanceViewModel)
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}
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}
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public extension ExploreViewModel {
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enum Event {
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case navigation(Navigation)
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}
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enum Section: Hashable {
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case trending
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case instance
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}
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enum Item: Hashable {
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case tag(Tag)
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case instance
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case profileDirectory
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}
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func refresh() {
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exploreService.fetchTrends()
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.handleEvents(receiveOutput: { [weak self] trends in
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DispatchQueue.main.async {
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self?.trends = trends
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}
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})
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.ignoreOutput()
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.merge(with: identityContext.service.refreshInstance())
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.receive(on: DispatchQueue.main)
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.handleEvents(receiveSubscription: { [weak self] _ in self?.loading = true },
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receiveCompletion: { [weak self] _ in self?.loading = false })
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.sink { _ in } receiveValue: { _ in }
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.store(in: &cancellables)
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}
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func viewModel(tag: Tag) -> TagViewModel {
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.init(tag: tag, identityContext: identityContext)
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}
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func select(item: ExploreViewModel.Item) {
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switch item {
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case let .tag(tag):
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eventsSubject.send(
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.navigation(.collection(exploreService
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.navigationService
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.timelineService(timeline: .tag(tag.name)))))
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case .instance:
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break
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case .profileDirectory:
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eventsSubject.send(
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.navigation(.collection(identityContext
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.service
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.service(accountList: .directory(local: true),
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titleComponents: ["explore.profile-directory"]))))
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}
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}
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}
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