266 lines
11 KiB
Swift
266 lines
11 KiB
Swift
//
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// MastodonPickServerViewModel.swift
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// Mastodon
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//
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// Created by BradGao on 2021/2/23.
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//
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import os.log
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import UIKit
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import Combine
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import GameplayKit
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import MastodonSDK
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import CoreDataStack
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class MastodonPickServerViewModel: NSObject {
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enum PickServerMode {
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case signUp
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case signIn
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}
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enum EmptyStateViewState {
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case none
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case loading
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case badNetwork
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}
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var disposeBag = Set<AnyCancellable>()
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// input
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let mode: PickServerMode
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let context: AppContext
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var categoryPickerItems: [CategoryPickerItem] = {
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var items: [CategoryPickerItem] = []
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items.append(.all)
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items.append(contentsOf: APIService.stubCategories().map { CategoryPickerItem.category(category: $0) })
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return items
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}()
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let selectCategoryItem = CurrentValueSubject<CategoryPickerItem, Never>(.all)
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let searchText = CurrentValueSubject<String, Never>("")
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let indexedServers = CurrentValueSubject<[Mastodon.Entity.Server], Never>([])
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let unindexedServers = CurrentValueSubject<[Mastodon.Entity.Server]?, Never>([]) // set nil when loading
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let viewWillAppear = PassthroughSubject<Void, Never>()
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// output
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var diffableDataSource: UITableViewDiffableDataSource<PickServerSection, PickServerItem>?
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private(set) lazy var loadIndexedServerStateMachine: GKStateMachine = {
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// exclude timeline middle fetcher state
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let stateMachine = GKStateMachine(states: [
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LoadIndexedServerState.Initial(viewModel: self),
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LoadIndexedServerState.Loading(viewModel: self),
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LoadIndexedServerState.Fail(viewModel: self),
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LoadIndexedServerState.Idle(viewModel: self),
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])
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stateMachine.enter(LoadIndexedServerState.Initial.self)
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return stateMachine
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}()
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let filteredIndexedServers = CurrentValueSubject<[Mastodon.Entity.Server], Never>([])
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let servers = CurrentValueSubject<[Mastodon.Entity.Server], Error>([])
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let selectedServer = CurrentValueSubject<Mastodon.Entity.Server?, Never>(nil)
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let error = CurrentValueSubject<Error?, Never>(nil)
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let isLoadingIndexedServers = CurrentValueSubject<Bool, Never>(false)
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let loadingIndexedServersError = CurrentValueSubject<Error?, Never>(nil)
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let emptyStateViewState = CurrentValueSubject<EmptyStateViewState, Never>(.none)
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init(context: AppContext, mode: PickServerMode) {
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self.context = context
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self.mode = mode
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super.init()
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configure()
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}
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deinit {
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s", ((#file as NSString).lastPathComponent), #line, #function)
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}
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}
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extension MastodonPickServerViewModel {
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private func configure() {
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Publishers.CombineLatest(
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filteredIndexedServers,
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unindexedServers
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)
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.receive(on: DispatchQueue.main)
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.sink(receiveValue: { [weak self] indexedServers, unindexedServers in
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guard let self = self else { return }
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guard let diffableDataSource = self.diffableDataSource else { return }
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let oldSnapshot = diffableDataSource.snapshot()
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var oldSnapshotServerItemAttributeDict: [String : PickServerItem.ServerItemAttribute] = [:]
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for item in oldSnapshot.itemIdentifiers {
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guard case let .server(server, attribute) = item else { continue }
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oldSnapshotServerItemAttributeDict[server.domain] = attribute
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}
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var snapshot = NSDiffableDataSourceSnapshot<PickServerSection, PickServerItem>()
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snapshot.appendSections([.header, .category, .search, .servers])
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snapshot.appendItems([.header], toSection: .header)
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snapshot.appendItems([.categoryPicker(items: self.categoryPickerItems)], toSection: .category)
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snapshot.appendItems([.search], toSection: .search)
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// TODO: handle filter
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var serverItems: [PickServerItem] = []
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for server in indexedServers {
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let attribute = oldSnapshotServerItemAttributeDict[server.domain] ?? PickServerItem.ServerItemAttribute(isLast: false, isExpand: false)
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attribute.isLast.value = false
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let item = PickServerItem.server(server: server, attribute: attribute)
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guard !serverItems.contains(item) else { continue }
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serverItems.append(item)
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}
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if let unindexedServers = unindexedServers {
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if !unindexedServers.isEmpty {
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for server in unindexedServers {
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let attribute = oldSnapshotServerItemAttributeDict[server.domain] ?? PickServerItem.ServerItemAttribute(isLast: false, isExpand: false)
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attribute.isLast.value = false
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let item = PickServerItem.server(server: server, attribute: attribute)
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guard !serverItems.contains(item) else { continue }
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serverItems.append(item)
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}
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} else {
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if indexedServers.isEmpty && !self.isLoadingIndexedServers.value {
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serverItems.append(.loader(attribute: PickServerItem.LoaderItemAttribute(isLast: false, isEmptyResult: true)))
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}
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}
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} else {
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serverItems.append(.loader(attribute: PickServerItem.LoaderItemAttribute(isLast: false, isEmptyResult: false)))
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}
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if case let .server(_, attribute) = serverItems.last {
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attribute.isLast.value = true
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}
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if case let .loader(attribute) = serverItems.last {
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attribute.isLast = true
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}
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snapshot.appendItems(serverItems, toSection: .servers)
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diffableDataSource.defaultRowAnimation = .fade
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diffableDataSource.apply(snapshot, animatingDifferences: true, completion: nil)
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})
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.store(in: &disposeBag)
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Publishers.CombineLatest(
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isLoadingIndexedServers,
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loadingIndexedServersError
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)
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.map { isLoadingIndexedServers, loadingIndexedServersError -> EmptyStateViewState in
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if isLoadingIndexedServers {
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if loadingIndexedServersError != nil {
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return .badNetwork
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} else {
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return .loading
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}
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} else {
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return .none
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}
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}
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.assign(to: \.value, on: emptyStateViewState)
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.store(in: &disposeBag)
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Publishers.CombineLatest3(
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indexedServers.eraseToAnyPublisher(),
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selectCategoryItem.eraseToAnyPublisher(),
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searchText.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main).removeDuplicates()
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)
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.map { indexedServers, selectCategoryItem, searchText -> [Mastodon.Entity.Server] in
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// Filter the indexed servers from joinmastodon.org
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switch selectCategoryItem {
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case .all:
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return MastodonPickServerViewModel.filterServers(servers: indexedServers, category: nil, searchText: searchText)
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case .category(let category):
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return MastodonPickServerViewModel.filterServers(servers: indexedServers, category: category.category.rawValue, searchText: searchText)
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}
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}
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.assign(to: \.value, on: filteredIndexedServers)
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.store(in: &disposeBag)
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searchText
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.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main)
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.removeDuplicates()
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.compactMap { [weak self] searchText -> AnyPublisher<Result<Mastodon.Response.Content<[Mastodon.Entity.Server]>, Error>, Never>? in
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// Check if searchText is a valid mastodon server domain
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guard let self = self else { return nil }
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guard let domain = AuthenticationViewModel.parseDomain(from: searchText) else {
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return Just(Result.failure(APIService.APIError.implicit(.badRequest))).eraseToAnyPublisher()
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}
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self.unindexedServers.value = nil
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return self.context.apiService.webFinger(domain: domain)
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.flatMap { domain -> AnyPublisher<Result<Mastodon.Response.Content<[Mastodon.Entity.Server]>, Error>, Never> in
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return self.context.apiService.instance(domain: domain)
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.map { response -> Result<Mastodon.Response.Content<[Mastodon.Entity.Server]>, Error>in
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let newResponse = response.map { [Mastodon.Entity.Server(domain: domain, instance: $0)] }
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return Result.success(newResponse)
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}
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.catch { error in
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return Just(Result.failure(error))
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}
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.eraseToAnyPublisher()
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}
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.catch { error in
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return Just(Result.failure(error))
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}
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.eraseToAnyPublisher()
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}
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.switchToLatest()
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.sink(receiveValue: { [weak self] result in
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guard let self = self else { return }
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switch result {
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case .success(let response):
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self.unindexedServers.send(response.value)
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case .failure(let error):
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if let error = error as? APIService.APIError,
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case let .implicit(reason) = error,
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case .badRequest = reason {
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self.unindexedServers.send([])
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} else {
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self.unindexedServers.send(nil)
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}
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}
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})
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.store(in: &disposeBag)
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}
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}
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extension MastodonPickServerViewModel {
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private static func filterServers(servers: [Mastodon.Entity.Server], category: String?, searchText: String) -> [Mastodon.Entity.Server] {
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return servers
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// 1. Filter the category
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.filter {
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guard let category = category else { return true }
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return $0.category.caseInsensitiveCompare(category) == .orderedSame
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}
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// 2. Filter the searchText
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.filter {
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let searchText = searchText.trimmingCharacters(in: .whitespacesAndNewlines)
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guard !searchText.isEmpty else {
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return true
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}
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return $0.domain.lowercased().contains(searchText.lowercased())
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}
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}
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}
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// MARK: - SignUp methods & structs
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extension MastodonPickServerViewModel {
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struct SignUpResponseFirst {
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let instance: Mastodon.Response.Content<Mastodon.Entity.Instance>
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let application: Mastodon.Response.Content<Mastodon.Entity.Application>
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}
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struct SignUpResponseSecond {
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let instance: Mastodon.Response.Content<Mastodon.Entity.Instance>
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let authenticateInfo: AuthenticationViewModel.AuthenticateInfo
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}
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struct SignUpResponseThird {
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let instance: Mastodon.Response.Content<Mastodon.Entity.Instance>
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let authenticateInfo: AuthenticationViewModel.AuthenticateInfo
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let applicationToken: Mastodon.Response.Content<Mastodon.Entity.Token>
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}
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}
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