// // FeedlySendArticleStatusesOperation.swift // Account // // Created by Kiel Gillard on 14/10/19. // Copyright © 2019 Ranchero Software, LLC. All rights reserved. // import Foundation import Articles import SyncDatabase import os.log /// Single responsibility is to take changes to statuses of articles locally and apply them to the corresponding the articles remotely. final class FeedlySendArticleStatusesOperation: FeedlyOperation { private let database: SyncDatabase private let log: OSLog private let service: FeedlyMarkArticlesService init(database: SyncDatabase, service: FeedlyMarkArticlesService, log: OSLog) { self.database = database self.service = service self.log = log } override func run() { os_log(.debug, log: log, "Sending article statuses...") database.selectForProcessing { result in if self.isCanceled { self.didFinish() return } switch result { case .success(let syncStatuses): self.processStatuses(syncStatuses) case .failure: self.didFinish() } } } } private extension FeedlySendArticleStatusesOperation { func processStatuses(_ pending: [SyncStatus]) { let statuses: [(status: ArticleStatus.Key, flag: Bool, action: FeedlyMarkAction)] = [ (.read, false, .unread), (.read, true, .read), (.starred, true, .saved), (.starred, false, .unsaved), ] let group = DispatchGroup() for pairing in statuses { let articleIds = pending.filter { $0.key == pairing.status && $0.flag == pairing.flag } guard !articleIds.isEmpty else { continue } let ids = Set(articleIds.map { $0.articleID }) let database = self.database group.enter() service.mark(ids, as: pairing.action) { result in assert(Thread.isMainThread) switch result { case .success: database.deleteSelectedForProcessing(Array(ids)) { _ in group.leave() } case .failure: database.resetSelectedForProcessing(Array(ids)) { _ in group.leave() } } } } group.notify(queue: DispatchQueue.main) { os_log(.debug, log: self.log, "Done sending article statuses.") self.didFinish() } } }