NetNewsWire/Frameworks/Account/Feedly/Operations/FeedlyMirrorCollectionsAsFo...

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//
// FeedlyMirrorCollectionsAsFoldersOperation.swift
// Account
//
// Created by Kiel Gillard on 20/9/19.
// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import os.log
protocol FeedlyCollectionsAndFoldersProviding: class {
var collectionsAndFolders: [(FeedlyCollection, Folder)] { get }
}
protocol FeedlyFeedsAndFoldersProviding {
var feedsAndFolders: [([FeedlyFeed], Folder)] { get }
}
/// Single responsibility is accurately reflect Collections from Feedly as Folders.
final class FeedlyMirrorCollectionsAsFoldersOperation: FeedlyOperation, FeedlyCollectionsAndFoldersProviding, FeedlyFeedsAndFoldersProviding {
let account: Account
let collectionsProvider: FeedlyCollectionProviding
let log: OSLog
private(set) var collectionsAndFolders = [(FeedlyCollection, Folder)]()
private(set) var feedsAndFolders = [([FeedlyFeed], Folder)]()
init(account: Account, collectionsProvider: FeedlyCollectionProviding, log: OSLog) {
self.collectionsProvider = collectionsProvider
self.account = account
self.log = log
}
override func main() {
defer { didFinish() }
guard !isCancelled else { return }
let localFolders = account.folders ?? Set()
let collections = collectionsProvider.collections
let pairs = collections.compactMap { collection -> (FeedlyCollection, Folder)? in
guard let folder = account.ensureFolder(with: collection.label) else {
assertionFailure("Why wasn't a folder created?")
return nil
}
folder.externalID = collection.id
return (collection, folder)
}
collectionsAndFolders = pairs
os_log(.debug, log: log, "Ensured %i folders for %i collections.", pairs.count, collections.count)
feedsAndFolders = pairs.map { (collection, folder) -> (([FeedlyFeed], Folder)) in
return (collection.feeds, folder)
}
// Remove folders without a corresponding collection
let collectionFolders = Set(pairs.map { $0.1 })
let foldersWithoutCollections = localFolders.subtracting(collectionFolders)
for unmatched in foldersWithoutCollections {
account.removeFolder(unmatched)
}
os_log(.debug, log: log, "Removed %i folders: %@", foldersWithoutCollections.count, foldersWithoutCollections.map { $0.externalID ?? $0.nameForDisplay })
}
}