Channel playlists cache

Model/Cache/ChannelPlaylistsCacheModel.swift

@@ -0,0 +1,70 @@
+import Cache
+import Foundation
+import Logging
+import SwiftyJSON
+
+struct ChannelPlaylistsCacheModel {
+    static let shared = ChannelPlaylistsCacheModel()
+    let logger = Logger(label: "stream.yattee.cache.channel-playlists")
+
+    static let diskConfig = DiskConfig(name: "channel-playlists")
+    static let memoryConfig = MemoryConfig()
+
+    let storage = try! Storage<String, JSON>(
+        diskConfig: Self.diskConfig,
+        memoryConfig: Self.memoryConfig,
+        transformer: CacheModel.jsonTransformer
+    )
+
+    func storePlaylist(playlist: ChannelPlaylist) {
+        let date = CacheModel.shared.iso8601DateFormatter.string(from: Date())
+        logger.info("STORE \(playlistCacheKey(playlist.id)) -- \(date)")
+        let feedTimeObject: JSON = ["date": date]
+        let playlistObject: JSON = ["playlist": playlist.json.object]
+        try? storage.setObject(feedTimeObject, forKey: playlistTimeCacheKey(playlist.id))
+        try? storage.setObject(playlistObject, forKey: playlistCacheKey(playlist.id))
+    }
+
+    func retrievePlaylist(_ id: ChannelPlaylist.ID) -> ChannelPlaylist? {
+        logger.info("RETRIEVE \(playlistCacheKey(id))")
+
+        if let json = try? storage.object(forKey: playlistCacheKey(id)).dictionaryValue["playlist"] {
+            return ChannelPlaylist.from(json)
+        }
+
+        return nil
+    }
+
+    func getPlaylistsTime(_ id: ChannelPlaylist.ID) -> Date? {
+        if let json = try? storage.object(forKey: playlistTimeCacheKey(id)),
+           let string = json.dictionaryValue["date"]?.string,
+           let date = CacheModel.shared.iso8601DateFormatter.date(from: string)
+        {
+            return date
+        }
+
+        return nil
+    }
+
+    func getFormattedPlaylistTime(_ id: ChannelPlaylist.ID) -> String {
+        if let time = getPlaylistsTime(id) {
+            let isSameDay = Calendar(identifier: .iso8601).isDate(time, inSameDayAs: Date())
+            let formatter = isSameDay ? CacheModel.shared.dateFormatterForTimeOnly : CacheModel.shared.dateFormatter
+            return formatter.string(from: time)
+        }
+
+        return ""
+    }
+
+    func clear() {
+        try? storage.removeAll()
+    }
+
+    private func playlistCacheKey(_ playlist: ChannelPlaylist.ID) -> String {
+        "channelplaylists-\(playlist)"
+    }
+
+    private func playlistTimeCacheKey(_ playlist: ChannelPlaylist.ID) -> String {
+        "\(playlistCacheKey(playlist))-time"
+    }
+}