78 lines
2.6 KiB
Swift
78 lines
2.6 KiB
Swift
//
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// DiscoveryHashtagsViewModel.swift
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// Mastodon
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//
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// Created by MainasuK on 2022-4-13.
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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 CoreData
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import CoreDataStack
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import MastodonSDK
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final class DiscoveryHashtagsViewModel {
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let logger = Logger(subsystem: "DiscoveryHashtagsViewModel", category: "ViewModel")
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var disposeBag = Set<AnyCancellable>()
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// input
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let context: AppContext
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let viewDidAppeared = PassthroughSubject<Void, Never>()
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// output
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var diffableDataSource: UITableViewDiffableDataSource<DiscoverySection, DiscoveryItem>?
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@Published var hashtags: [Mastodon.Entity.Tag] = []
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init(context: AppContext) {
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self.context = context
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// end 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 { authenticationBox, _ -> MastodonAuthenticationBox? in
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return authenticationBox
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}
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.throttle(for: 3, scheduler: DispatchQueue.main, latest: true)
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.asyncMap { authenticationBox in
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try await context.apiService.trendHashtags(domain: authenticationBox.domain, query: nil)
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}
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.retry(3)
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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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.receive(on: DispatchQueue.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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self.hashtags = response.value.filter { !$0.name.isEmpty }
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case .failure:
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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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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 DiscoveryHashtagsViewModel {
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@MainActor
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func fetch() async throws {
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guard let authenticationBox = context.authenticationService.activeMastodonAuthenticationBox.value else { return }
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let response = try await context.apiService.trendHashtags(domain: authenticationBox.domain, query: nil)
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hashtags = response.value.filter { !$0.name.isEmpty }
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logger.log(level: .debug, "\((#file as NSString).lastPathComponent, privacy: .public)[\(#line, privacy: .public)], \(#function, privacy: .public): fetch tags: \(response.value.count)")
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}
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}
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