59 lines
2.0 KiB
Swift
59 lines
2.0 KiB
Swift
//
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// WidgetHelper.swift
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// Reader
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//
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// Created by Shadowfacts on 6/19/22.
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//
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import Foundation
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import WidgetKit
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import Persistence
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import OSLog
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private let logger = Logger(subsystem: "net.shadowfacts.Reader", category: "WidgetHelper")
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struct WidgetHelper {
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private init() {}
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private static let maxDisplayableItems = 8
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static func updateWidgetData(fervorController: FervorController) async {
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// Accessing CoreData from the widget extension puts us over the memory limit, so we pre-generate all the data it needs and save it to disk
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let context = fervorController.persistentContainer.backgroundContext
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let prioritizedItems: [WidgetData.Item] = await context.perform {
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let req = Item.fetchRequest()
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req.sortDescriptors = [NSSortDescriptor(key: "published", ascending: false)]
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req.fetchLimit = 32
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req.predicate = NSPredicate(format: "read = NO")
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var items = (try? context.fetch(req)) ?? []
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var prioritizedItems: [Item] = []
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while prioritizedItems.count < maxDisplayableItems {
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let firstFromUnseenFeedIdx = items.firstIndex { item in
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prioritizedItems.allSatisfy { existing in
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existing.feed != item.feed
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}
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}
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if let firstFromUnseenFeedIdx {
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prioritizedItems.append(items.remove(at: firstFromUnseenFeedIdx))
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} else if let item = items.first {
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prioritizedItems.append(item)
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items.removeFirst()
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} else {
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break
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}
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}
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return prioritizedItems.map {
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WidgetData.Item(id: $0.id!, feedTitle: $0.feed?.title, title: $0.title, published: $0.published)
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}
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}
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WidgetData(recentItems: prioritizedItems).save(account: fervorController.account!)
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WidgetCenter.shared.reloadAllTimelines()
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}
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}
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