Only show banner if less than 10% space is available.

podcasts/DownloadsManageBannerView.swift

@@ -23,6 +23,13 @@ class DownloadsManageModel: ObservableObject {
             }
         }
     }
+
+    static var shouldShowBanner: Bool {
+        guard let percentage = FileManager.devicePercentageFreeSpace else {
+            return false
+        }
+        return percentage < 0.1
+    }
 }
 
 struct DownloadsManageBannerView: View {

podcasts/DownloadsViewController.swift

@@ -140,7 +140,9 @@ class DownloadsViewController: PCViewController {
     }
 
     func showManageDownloads() {
-        guard FeatureFlag.manageDownloadedEpisodes.enabled else {
+        guard FeatureFlag.manageDownloadedEpisodes.enabled,
+              DownloadsManageModel.shouldShowBanner
+        else {
             downloadsTable.tableHeaderView = nil
             return
         }

podcasts/FileManager+Helper.swift

@@ -9,4 +9,32 @@ extension FileManager {
         }
         return Int64(fileSize)
     }
+
+    static var deviceRemainingFreeSpaceInBytes: Int64? {
+        let fileURL = URL(fileURLWithPath: NSHomeDirectory() as String)
+        do {
+            let values = try fileURL.resourceValues(forKeys: [.volumeAvailableCapacityKey])
+            return Int64(values.volumeAvailableCapacity ?? 0)
+        } catch {
+            return nil
+        }
+    }
+
+    static var deviceTotalSpaceInBytes: Int64? {
+        let fileURL = URL(fileURLWithPath: NSHomeDirectory() as String)
+        do {
+            let values = try fileURL.resourceValues(forKeys: [.volumeTotalCapacityKey])
+            return Int64(values.volumeTotalCapacity ?? 0)
+        } catch {
+            return nil
+        }
+    }
+
+    static var devicePercentageFreeSpace: Double? {
+        guard let total = deviceTotalSpaceInBytes,
+              let free = deviceRemainingFreeSpaceInBytes else {
+            return nil
+        }
+        return Double(free) / Double(total)
+    }
 }