83 lines
2.3 KiB
Swift
83 lines
2.3 KiB
Swift
//
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// FeedlyCreateFeedsForCollectionFoldersOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 20/9/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import os.log
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/// Single responsibility is to accurately reflect Collections and their Feeds as Folders and their Feeds.
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final class FeedlyCreateFeedsForCollectionFoldersOperation: FeedlyOperation {
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let account: Account
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let collectionsAndFoldersProvider: FeedlyCollectionsAndFoldersProviding
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let log: OSLog
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init(account: Account, collectionsAndFoldersProvider: FeedlyCollectionsAndFoldersProviding, log: OSLog) {
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self.collectionsAndFoldersProvider = collectionsAndFoldersProvider
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self.account = account
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self.log = log
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}
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override func main() {
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defer { didFinish() }
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guard !isCancelled else { return }
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var localFeeds = account.flattenedFeeds()
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let feedsBefore = localFeeds
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let pairs = collectionsAndFoldersProvider.collectionsAndFolders
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let feedsAndFolders = pairs
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.compactMap { ($0.0.feeds, $0.1) }
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.map({ (collectionFeeds, folder) -> [(FeedlyFeed, Folder)] in
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return collectionFeeds.map { feed -> (FeedlyFeed, Folder) in
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return (feed, folder) // pairs a folder for every feed in parallel
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}
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})
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.flatMap { $0 }
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.compactMap { (collectionFeed, folder) -> (Feed, Folder) in
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// find an existing feed
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for feed in localFeeds {
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if feed.feedID == collectionFeed.feedId {
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return (feed, folder)
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}
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}
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// no exsiting feed, create a new one
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let url = collectionFeed.id
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let metadata = FeedMetadata(feedID: url)
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// TODO: More metadata
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let feed = Feed(account: account, url: url, metadata: metadata)
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feed.name = collectionFeed.title
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// So the same feed isn't created more than once.
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localFeeds.insert(feed)
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return (feed, folder)
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}
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os_log(.debug, log: log, "Processing %i feeds.", feedsAndFolders.count)
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feedsAndFolders.forEach { (feed, folder) in
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if !folder.has(feed) {
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folder.addFeed(feed)
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}
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}
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let feedsAfter = Set(feedsAndFolders.map { $0.0 })
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let feedsWithoutCollections = feedsBefore.subtracting(feedsAfter)
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for unmatched in feedsWithoutCollections {
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account.removeFeed(unmatched)
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}
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if !feedsWithoutCollections.isEmpty {
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os_log(.debug, log: log, "Removed %i feeds", feedsWithoutCollections.count)
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}
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}
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}
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