forked from zelo72/mastodon-ios
145 lines
6.2 KiB
Swift
145 lines
6.2 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 currentMastodonUser = CurrentValueSubject<MastodonUser?, Never>(nil)
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let viewDidAppeared = PassthroughSubject<Void, Never>()
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// output
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// var recommendHashTags = [Mastodon.Entity.Tag]()
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var recommendAccounts = [NSManagedObjectID]()
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var recommendAccountsFallback = PassthroughSubject<Void, Never>()
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var hashtagDiffableDataSource: UICollectionViewDiffableDataSource<RecommendHashTagSection, Mastodon.Entity.Tag>?
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var accountDiffableDataSource: UICollectionViewDiffableDataSource<RecommendAccountSection, NSManagedObjectID>?
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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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Publishers.CombineLatest(
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context.authenticationService.activeMastodonAuthenticationBox,
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viewDidAppeared
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)
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.compactMap { activeMastodonAuthenticationBox, _ -> MastodonAuthenticationBox? in
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return activeMastodonAuthenticationBox
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}
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.throttle(for: 1, scheduler: DispatchQueue.main, latest: false)
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.flatMap { box in
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context.apiService.recommendTrends(domain: box.domain, query: nil)
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.map { response in Result<Mastodon.Response.Content<[Mastodon.Entity.Tag]>, Error> { response } }
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.catch { error in Just(Result<Mastodon.Response.Content<[Mastodon.Entity.Tag]>, Error> { throw error }) }
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.eraseToAnyPublisher()
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}
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.receive(on: RunLoop.main)
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.sink { [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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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(response.value, toSection: .main)
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dataSource.apply(snapshot, animatingDifferences: false, completion: nil)
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case .failure(let error):
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break
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}
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}
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.store(in: &disposeBag)
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Publishers.CombineLatest(
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context.authenticationService.activeMastodonAuthenticationBox,
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viewDidAppeared
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)
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.compactMap { activeMastodonAuthenticationBox, _ -> MastodonAuthenticationBox? in
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return activeMastodonAuthenticationBox
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}
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.throttle(for: 1, scheduler: DispatchQueue.main, latest: false)
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.flatMap { box -> AnyPublisher<Result<[Mastodon.Entity.Account.ID], Error>, Never> in
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context.apiService.suggestionAccountV2(domain: box.domain, query: nil, mastodonAuthenticationBox: box)
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.map { response in Result<[Mastodon.Entity.Account.ID], Error> { response.value.map { $0.account.id } } }
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.catch { error -> AnyPublisher<Result<[Mastodon.Entity.Account.ID], Error>, Never> in
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if let apiError = error as? Mastodon.API.Error, apiError.httpResponseStatus == .notFound {
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return context.apiService.suggestionAccount(domain: box.domain, query: nil, mastodonAuthenticationBox: box)
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.map { response in Result<[Mastodon.Entity.Account.ID], Error> { response.value.map { $0.id } } }
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.catch { error in Just(Result<[Mastodon.Entity.Account.ID], Error> { throw error }) }
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.eraseToAnyPublisher()
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} else {
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return Just(Result<[Mastodon.Entity.Account.ID], Error> { throw error })
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.eraseToAnyPublisher()
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}
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}
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.eraseToAnyPublisher()
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}
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.receive(on: RunLoop.main)
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.sink { [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 userIDs):
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self.receiveAccounts(ids: userIDs)
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case .failure(let error):
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break
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}
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}
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.store(in: &disposeBag)
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}
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func receiveAccounts(ids: [Mastodon.Entity.Account.ID]) {
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guard let activeMastodonAuthenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else {
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return
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}
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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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guard let users = mastodonUsers else { return }
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let objectIDs: [NSManagedObjectID] = users
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.compactMap { object in
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ids.firstIndex(of: object.id).map { index in (index, object) }
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}
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.sorted { $0.0 < $1.0 }
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.map { $0.1.objectID }
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// append at front
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let newObjectIDs = objectIDs.filter { !self.recommendAccounts.contains($0) }
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self.recommendAccounts = newObjectIDs + self.recommendAccounts
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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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}
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