NetNewsWire/Shared/SmartFeeds/SmartFeed.swift

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//
// SmartFeed.swift
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// NetNewsWire
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//
// Created by Brent Simmons on 11/19/17.
// Copyright © 2017 Ranchero Software. All rights reserved.
//
import Foundation
import Articles
import ArticlesDatabase
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import Account
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import Database
import Core
import Images
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final class SmartFeed: PseudoFeed {
var account: Account? = nil
var defaultReadFilterType: ReadFilterType {
return .none
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}
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var sidebarItemID: SidebarItemIdentifier? {
delegate.sidebarItemID
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}
var nameForDisplay: String {
return delegate.nameForDisplay
}
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var unreadCount = 0 {
didSet {
if unreadCount != oldValue {
postUnreadCountDidChangeNotification()
}
}
}
var smallIcon: IconImage? {
return delegate.smallIcon
}
#if os(macOS)
var pasteboardWriter: NSPasteboardWriting {
return SmartFeedPasteboardWriter(smartFeed: self)
}
#endif
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private lazy var postponingBlock: PostponingBlock = {
PostponingBlock(delayInterval: 1.0) {
Task {
try? await self.fetchUnreadCounts()
}
}
}()
private var fetchUnreadCountsTask: Task<Void, Never>?
private let delegate: SmartFeedDelegate
private var unreadCounts = [String: Int]()
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@MainActor init(delegate: SmartFeedDelegate) {
self.delegate = delegate
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NotificationCenter.default.addObserver(self, selector: #selector(unreadCountDidChange(_:)), name: .UnreadCountDidChange, object: nil)
queueFetchUnreadCounts() // Fetch unread count at startup
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}
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@MainActor @objc func unreadCountDidChange(_ note: Notification) {
if note.object is AppDelegate {
queueFetchUnreadCounts()
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}
}
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@MainActor func fetchUnreadCounts() async throws {
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let activeAccounts = AccountManager.shared.activeAccounts
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// Remove any accounts that are no longer active or have been deleted
let activeAccountIDs = activeAccounts.map { $0.accountID }
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for accountID in unreadCounts.keys {
if !activeAccountIDs.contains(accountID) {
unreadCounts.removeValue(forKey: accountID)
}
}
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if activeAccounts.isEmpty {
updateUnreadCount()
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return
}
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for account in activeAccounts {
await fetchUnreadCount(for: account)
}
}
}
extension SmartFeed: ArticleFetcher {
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func fetchArticles() async throws -> Set<Article> {
try await delegate.fetchArticles()
}
func fetchUnreadArticles() async throws -> Set<Article> {
try await delegate.fetchUnreadArticles()
}
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}
private extension SmartFeed {
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@MainActor func queueFetchUnreadCounts() {
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postponingBlock.runInFuture()
}
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@MainActor func fetchUnreadCount(for account: Account) async {
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let unreadCount = await delegate.unreadCount(account: account)
unreadCounts[account.accountID] = unreadCount
updateUnreadCount()
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}
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@MainActor func updateUnreadCount() {
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var unread = 0
for account in AccountManager.shared.activeAccounts {
unread = unread + (unreadCounts[account.accountID] ?? 0)
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}
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unreadCount = unread
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}
}
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