407 lines
20 KiB
Swift
407 lines
20 KiB
Swift
//
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// SearchViewModel.swift
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// Mastodon
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//
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// Created by sxiaojian on 2021/3/31.
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//
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import Combine
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import CoreData
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import CoreDataStack
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import Foundation
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import GameplayKit
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import MastodonSDK
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import OSLog
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import UIKit
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final class SearchViewModel: NSObject {
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var disposeBag = Set<AnyCancellable>()
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// input
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let context: AppContext
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weak var coordinator: SceneCoordinator!
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let mastodonUser = CurrentValueSubject<MastodonUser?, Never>(nil)
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let currentMastodonUser = CurrentValueSubject<MastodonUser?, Never>(nil)
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// output
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let searchText = CurrentValueSubject<String, Never>("")
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let searchScope = CurrentValueSubject<Mastodon.API.Search.SearchType, Never>(Mastodon.API.Search.SearchType.default)
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let isSearching = CurrentValueSubject<Bool, Never>(false)
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let searchResult = CurrentValueSubject<Mastodon.Entity.SearchResult?, Never>(nil)
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var recommendHashTags = [Mastodon.Entity.Tag]()
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var recommendAccounts = [NSManagedObjectID]()
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var hashtagDiffableDataSource: UICollectionViewDiffableDataSource<RecommendHashTagSection, Mastodon.Entity.Tag>?
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var accountDiffableDataSource: UICollectionViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID>?
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var searchResultDiffableDataSource: UITableViewDiffableDataSource<SearchResultSection, SearchResultItem>?
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// bottom loader
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private(set) lazy var loadoldestStateMachine: GKStateMachine = {
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// exclude timeline middle fetcher state
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let stateMachine = GKStateMachine(states: [
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LoadOldestState.Initial(viewModel: self),
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LoadOldestState.Loading(viewModel: self),
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LoadOldestState.Fail(viewModel: self),
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LoadOldestState.Idle(viewModel: self),
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LoadOldestState.NoMore(viewModel: self),
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])
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stateMachine.enter(LoadOldestState.Initial.self)
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return stateMachine
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}()
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lazy var loadOldestStateMachinePublisher = CurrentValueSubject<LoadOldestState?, Never>(nil)
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init(context: AppContext, coordinator: SceneCoordinator) {
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self.coordinator = coordinator
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self.context = context
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super.init()
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guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
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return
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}
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// bind active authentication
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context.authenticationService.activeMastodonAuthentication
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.sink { [weak self] activeMastodonAuthentication in
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guard let self = self else { return }
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guard let activeMastodonAuthentication = activeMastodonAuthentication else {
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self.currentMastodonUser.value = nil
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return
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}
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self.currentMastodonUser.value = activeMastodonAuthentication.user
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}
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.store(in: &disposeBag)
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Publishers.CombineLatest(
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searchText
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.debounce(for: .milliseconds(300), scheduler: DispatchQueue.main).removeDuplicates(),
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searchScope
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)
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.filter { text, _ in
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!text.isEmpty
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}
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.flatMap { (text, scope) -> AnyPublisher<Mastodon.Response.Content<Mastodon.Entity.SearchResult>, Error> in
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let query = Mastodon.API.Search.Query(q: text,
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type: scope,
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accountID: nil,
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maxID: nil,
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minID: nil,
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excludeUnreviewed: nil,
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resolve: nil,
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limit: nil,
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offset: nil,
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following: nil)
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return context.apiService.search(domain: activeMastodonAuthenticationBox.domain, query: query, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
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}
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.sink { _ in
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} receiveValue: { [weak self] result in
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self?.searchResult.value = result.value
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}
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.store(in: &disposeBag)
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isSearching
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.sink { [weak self] isSearching in
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if !isSearching {
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self?.searchResult.value = nil
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self?.searchText.value = ""
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}
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}
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.store(in: &disposeBag)
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Publishers.CombineLatest3(
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isSearching,
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searchText,
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searchScope
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)
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.filter { isSearching, _, _ in
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isSearching
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}
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.sink { [weak self] _, text, scope in
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guard text.isEmpty else { return }
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guard let self = self else { return }
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guard let searchHistories = self.fetchSearchHistory() else { return }
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guard let dataSource = self.searchResultDiffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<SearchResultSection, SearchResultItem>()
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snapshot.appendSections([.mixed])
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searchHistories.forEach { searchHistory in
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let containsAccount = scope == Mastodon.API.Search.SearchType.accounts || scope == Mastodon.API.Search.SearchType.default
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let containsHashTag = scope == Mastodon.API.Search.SearchType.hashtags || scope == Mastodon.API.Search.SearchType.default
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if let mastodonUser = searchHistory.account, containsAccount {
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let item = SearchResultItem.accountObjectID(accountObjectID: mastodonUser.objectID)
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snapshot.appendItems([item], toSection: .mixed)
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}
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if let tag = searchHistory.hashtag, containsHashTag {
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let item = SearchResultItem.hashtagObjectID(hashtagObjectID: tag.objectID)
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snapshot.appendItems([item], toSection: .mixed)
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}
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}
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dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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}
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.store(in: &disposeBag)
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requestRecommendHashTags()
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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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if !self.recommendHashTags.isEmpty {
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guard let dataSource = self.hashtagDiffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<RecommendHashTagSection, Mastodon.Entity.Tag>()
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snapshot.appendSections([.main])
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snapshot.appendItems(self.recommendHashTags, toSection: .main)
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dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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}
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} receiveValue: { _ in
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}
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.store(in: &disposeBag)
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requestRecommendAccounts()
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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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if !self.recommendAccounts.isEmpty {
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guard let dataSource = self.accountDiffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<RecommendAccountSection, NSManagedObjectID>()
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snapshot.appendSections([.main])
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snapshot.appendItems(self.recommendAccounts, toSection: .main)
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dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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}
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} receiveValue: { _ in
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}
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.store(in: &disposeBag)
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searchResult
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.receive(on: DispatchQueue.main)
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.sink { [weak self] searchResult in
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guard let self = self else { return }
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guard let dataSource = self.searchResultDiffableDataSource else { return }
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var snapshot = NSDiffableDataSourceSnapshot<SearchResultSection, SearchResultItem>()
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if let accounts = searchResult?.accounts {
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snapshot.appendSections([.account])
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let items = accounts.compactMap { SearchResultItem.account(account: $0) }
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snapshot.appendItems(items, toSection: .account)
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if self.searchScope.value == Mastodon.API.Search.SearchType.accounts, !items.isEmpty {
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snapshot.appendItems([.bottomLoader], toSection: .account)
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}
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}
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if let tags = searchResult?.hashtags {
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snapshot.appendSections([.hashtag])
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let items = tags.compactMap { SearchResultItem.hashtag(tag: $0) }
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snapshot.appendItems(items, toSection: .hashtag)
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if self.searchScope.value == Mastodon.API.Search.SearchType.hashtags, !items.isEmpty {
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snapshot.appendItems([.bottomLoader], toSection: .hashtag)
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}
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}
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dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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}
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.store(in: &disposeBag)
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}
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func requestRecommendHashTags() -> Future<Void, Error> {
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Future { promise in
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guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
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promise(.failure(APIService.APIError.implicit(APIService.APIError.ErrorReason.authenticationMissing)))
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return
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}
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self.context.apiService.recommendTrends(domain: activeMastodonAuthenticationBox.domain, query: nil)
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.sink { completion in
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switch completion {
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case .failure(let error):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendHashTags request fail: %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
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promise(.failure(error))
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case .finished:
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendHashTags request success", (#file as NSString).lastPathComponent, #line, #function)
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promise(.success(()))
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}
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} receiveValue: { [weak self] tags in
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guard let self = self else { return }
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self.recommendHashTags = tags.value
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}
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.store(in: &self.disposeBag)
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}
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}
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func requestRecommendAccounts() -> Future<Void, Error> {
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Future { promise in
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guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
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promise(.failure(APIService.APIError.implicit(APIService.APIError.ErrorReason.authenticationMissing)))
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return
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}
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self.context.apiService.recommendAccount(domain: activeMastodonAuthenticationBox.domain, query: nil, mastodonAuthenticationBox: activeMastodonAuthenticationBox)
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.sink { completion in
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switch completion {
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case .failure(let error):
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendHashTags request fail: %s", (#file as NSString).lastPathComponent, #line, #function, error.localizedDescription)
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promise(.failure(error))
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case .finished:
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os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: recommendHashTags request success", (#file as NSString).lastPathComponent, #line, #function)
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promise(.success(()))
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}
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} receiveValue: { [weak self] accounts in
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guard let self = self else { return }
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let ids = accounts.value.compactMap({$0.id})
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let userFetchRequest = MastodonUser.sortedFetchRequest
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userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
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let mastodonUsers: [MastodonUser]? = {
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let userFetchRequest = MastodonUser.sortedFetchRequest
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userFetchRequest.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, ids: ids)
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userFetchRequest.returnsObjectsAsFaults = false
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do {
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return try self.context.managedObjectContext.fetch(userFetchRequest)
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} catch {
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assertionFailure(error.localizedDescription)
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return nil
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}
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}()
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if let users = mastodonUsers {
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self.recommendAccounts = users.map(\.objectID)
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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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func accountCollectionViewItemDidSelected(mastodonUser: MastodonUser, from: UIViewController) {
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let viewModel = ProfileViewModel(context: context, optionalMastodonUser: mastodonUser)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .profile(viewModel: viewModel), from: from, transition: .show)
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}
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}
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func hashtagCollectionViewItemDidSelected(hashtag: Mastodon.Entity.Tag, from: UIViewController) {
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let (tagInCoreData, _) = APIService.CoreData.createOrMergeTag(into: context.managedObjectContext, entity: hashtag)
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let viewModel = HashtagTimelineViewModel(context: context, hashtag: tagInCoreData.name)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .hashtagTimeline(viewModel: viewModel), from: from, transition: .show)
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}
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}
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func searchResultItemDidSelected(item: SearchResultItem, from: UIViewController) {
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let searchHistories = fetchSearchHistory()
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_ = context.managedObjectContext.performChanges { [weak self] in
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guard let self = self else { return }
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switch item {
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case .account(let account):
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guard let activeMastodonAuthenticationBox = self.context.authenticationService.activeMastodonAuthenticationBox.value else {
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return
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}
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// load request mastodon user
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let requestMastodonUser: MastodonUser? = {
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let request = MastodonUser.sortedFetchRequest
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request.predicate = MastodonUser.predicate(domain: activeMastodonAuthenticationBox.domain, id: activeMastodonAuthenticationBox.userID)
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request.fetchLimit = 1
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request.returnsObjectsAsFaults = false
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do {
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return try self.context.managedObjectContext.fetch(request).first
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} catch {
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assertionFailure(error.localizedDescription)
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return nil
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}
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}()
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let (mastodonUser, _) = APIService.CoreData.createOrMergeMastodonUser(into: self.context.managedObjectContext, for: requestMastodonUser, in: activeMastodonAuthenticationBox.domain, entity: account, userCache: nil, networkDate: Date(), log: OSLog.api)
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if let searchHistories = searchHistories {
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let history = searchHistories.first { history -> Bool in
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guard let account = history.account else { return false }
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return account.objectID == mastodonUser.objectID
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}
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if let history = history {
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history.update(updatedAt: Date())
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} else {
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SearchHistory.insert(into: self.context.managedObjectContext, account: mastodonUser)
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}
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} else {
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SearchHistory.insert(into: self.context.managedObjectContext, account: mastodonUser)
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}
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let viewModel = ProfileViewModel(context: self.context, optionalMastodonUser: mastodonUser)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .profile(viewModel: viewModel), from: from, transition: .show)
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}
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case .hashtag(let tag):
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let (tagInCoreData, _) = APIService.CoreData.createOrMergeTag(into: self.context.managedObjectContext, entity: tag)
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if let searchHistories = searchHistories {
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let history = searchHistories.first { history -> Bool in
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guard let hashtag = history.hashtag else { return false }
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return hashtag.objectID == tagInCoreData.objectID
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}
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if let history = history {
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history.update(updatedAt: Date())
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} else {
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SearchHistory.insert(into: self.context.managedObjectContext, hashtag: tagInCoreData)
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}
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} else {
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SearchHistory.insert(into: self.context.managedObjectContext, hashtag: tagInCoreData)
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}
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let viewModel = HashtagTimelineViewModel(context: self.context, hashtag: tagInCoreData.name)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .hashtagTimeline(viewModel: viewModel), from: from, transition: .show)
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}
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case .accountObjectID(let accountObjectID):
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if let searchHistories = searchHistories {
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let history = searchHistories.first { history -> Bool in
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guard let account = history.account else { return false }
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return account.objectID == accountObjectID
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}
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if let history = history {
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history.update(updatedAt: Date())
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}
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}
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let mastodonUser = self.context.managedObjectContext.object(with: accountObjectID) as! MastodonUser
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let viewModel = ProfileViewModel(context: self.context, optionalMastodonUser: mastodonUser)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .profile(viewModel: viewModel), from: from, transition: .show)
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}
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case .hashtagObjectID(let hashtagObjectID):
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if let searchHistories = searchHistories {
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let history = searchHistories.first { history -> Bool in
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guard let hashtag = history.hashtag else { return false }
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return hashtag.objectID == hashtagObjectID
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}
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if let history = history {
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history.update(updatedAt: Date())
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}
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}
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let tagInCoreData = self.context.managedObjectContext.object(with: hashtagObjectID) as! Tag
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let viewModel = HashtagTimelineViewModel(context: self.context, hashtag: tagInCoreData.name)
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DispatchQueue.main.async {
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self.coordinator.present(scene: .hashtagTimeline(viewModel: viewModel), from: from, transition: .show)
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}
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default:
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break
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}
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}
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}
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func fetchSearchHistory() -> [SearchHistory]? {
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let searchHistory: [SearchHistory]? = {
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let request = SearchHistory.sortedFetchRequest
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request.predicate = nil
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request.returnsObjectsAsFaults = false
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do {
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return try context.managedObjectContext.fetch(request)
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} catch {
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assertionFailure(error.localizedDescription)
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return nil
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}
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}()
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return searchHistory
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}
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func deleteSearchHistory() {
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let result = fetchSearchHistory()
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_ = context.managedObjectContext.performChanges { [weak self] in
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result?.forEach { history in
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self?.context.managedObjectContext.delete(history)
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}
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self?.isSearching.value = true
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}
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}
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}
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