Multiplatform UI support fixes

Model/NavigationState.swift

@@ -0,0 +1,43 @@
+import Foundation
+import SwiftUI
+
+final class NavigationState: ObservableObject {
+    @Published var tabSelection: TabSelection = .subscriptions
+
+    @Published var showingChannel = false
+    @Published var channel: Channel?
+
+    @Published var showingVideoDetails = false
+    @Published var video: Video?
+
+    func openChannel(_ channel: Channel) {
+        self.channel = channel
+        showingChannel = true
+    }
+
+    func closeChannel() {
+        showingChannel = false
+        channel = nil
+    }
+
+    func openVideoDetails(_ video: Video) {
+        self.video = video
+        showingVideoDetails = true
+    }
+
+    func closeVideoDetails() {
+        showingVideoDetails = false
+        video = nil
+    }
+
+    var tabSelectionOptionalBinding: Binding<TabSelection?> {
+        Binding<TabSelection?>(
+            get: {
+                self.tabSelection
+            },
+            set: {
+                self.tabSelection = $0 ?? .subscriptions
+            }
+        )
+    }
+}

Model/PlayerState.swift

@@ -1,7 +1,9 @@
 import AVFoundation
 import Foundation
 import Logging
-import UIKit
+#if !os(macOS)
+    import UIKit
+#endif
 
 final class PlayerState: ObservableObject {
     let logger = Logger(label: "net.arekf.Pearvidious.ps")
@@ -36,15 +38,19 @@ final class PlayerState: ObservableObject {
             makeMetadataItem(.commonIdentifierDescription, value: video.description)
         ]
 
-        if let thumbnailData = try? Data(contentsOf: video.thumbnailURL(quality: "high")!),
-           let image = UIImage(data: thumbnailData),
-           let pngData = image.pngData()
-        {
-            let artworkItem = makeMetadataItem(.commonIdentifierArtwork, value: pngData)
-            externalMetadata.append(artworkItem)
-        }
+        #if !os(macOS)
 
-        playerItem.externalMetadata = externalMetadata
+            if let thumbnailData = try? Data(contentsOf: video.thumbnailURL(quality: "high")!),
+               let image = UIImage(data: thumbnailData),
+               let pngData = image.pngData()
+            {
+                let artworkItem = makeMetadataItem(.commonIdentifierArtwork, value: pngData)
+                externalMetadata.append(artworkItem)
+            }
+
+            playerItem.externalMetadata = externalMetadata
+
+        #endif
 
         playerItem.preferredForwardBufferDuration = 10
 

Model/SearchQuery.swift

@@ -15,4 +15,8 @@ final class SearchQuery: ObservableObject {
         self.date = date
         self.duration = duration
     }
+
+    var isEmpty: Bool {
+        query.isEmpty
+    }
 }