Add button and prepare view model to implement API

podcasts/PodcastFeedViewModel.swift

@@ -1,9 +1,43 @@
 import Foundation
 
 class PodcastFeedViewModel {
+    enum LoadingState {
+        case idle
+        case loading
+    }
+
     let uuid: String?
 
+    private(set) var loadingState: LoadingState = .idle
+
     init(uuid: String?) {
         self.uuid = uuid
     }
+
+    func checkIfNewEpisodesAreAvailable() async -> Bool {
+        // Test implementation to simulate the API
+        await MainActor.run {
+            loadingState = .loading
+        }
+        _ = await shouldReloadPodcasts()
+
+        try? await Task.sleep(nanoseconds: 3_000_000_000)
+
+        await MainActor.run {
+            Toast.show(L10n.podcastFeedReloadNoEpisodesFound)
+        }
+        await MainActor.run {
+            loadingState = .idle
+        }
+        return false
+    }
+
+    private func shouldReloadPodcasts() async -> Int {
+        await MainActor.run {
+            Toast.show(L10n.podcastFeedReloadLoading)
+        }
+        return 202
+    }
+
+    private func pollUpdatePodcast() async { }
 }

podcasts/PodcastViewController.swift

@@ -942,7 +942,15 @@ class PodcastViewController: FakeNavViewController, PodcastActionsDelegate, Sync
     }
 
     func reloadPodcastFeed() {
-
+        if podcastFeedViewModel?.loadingState == .loading {
+            return
+        }
+        Task { @MainActor [weak self] in
+            let podcastNeedsReload = await self?.podcastFeedViewModel?.checkIfNewEpisodesAreAvailable() ?? false
+            if podcastNeedsReload {
+                self?.loadPodcastInfo()
+            }
+        }
     }
 
     // MARK: - Long press actions