Add to playlist from video player, state fixes

Shared/Throttle.swift

@@ -0,0 +1,40 @@
+import Foundation
+
+final class Throttle {
+    let interval: TimeInterval
+    private(set) var lastExecutedAt: Date?
+
+    private let syncQueue = DispatchQueue(label: "net.yatee.app.throttle")
+
+    init(interval: TimeInterval) {
+        self.interval = interval
+    }
+
+    @discardableResult func execute(_ action: () -> Void) -> Bool {
+        let executed = syncQueue.sync { () -> Bool in
+            let now = Date()
+
+            let timeInterval = now.timeIntervalSince(lastExecutedAt ?? .distantPast)
+
+            if timeInterval > interval {
+                lastExecutedAt = now
+
+                return true
+            }
+
+            return false
+        }
+
+        if executed {
+            action()
+        }
+
+        return executed
+    }
+
+    func reset() {
+        syncQueue.sync {
+            lastExecutedAt = nil
+        }
+    }
+}