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