add video import duration limit

Pocket Poster/Controllers/VideoHandler.swift

@@ -8,6 +8,7 @@
 import Foundation
 import AVFoundation
 import UIKit
+import CoreTransferable
 
 extension CGImage {
     var png: Data? {
@@ -23,7 +24,55 @@ extension CGImage {
     }
 }
 
+struct Movie: Transferable {
+    let url: URL
+
+    static var transferRepresentation: some TransferRepresentation {
+        FileRepresentation(contentType: .movie) { movie in
+            SentTransferredFile(movie.url)
+        } importing: { received in
+            let videoFolder = SymHandler.getDocumentsDirectory().appendingPathComponent("Videos", conformingTo: .directory)
+            if !FileManager.default.fileExists(atPath: videoFolder.path()) {
+                try? FileManager.default.createDirectory(at: videoFolder, withIntermediateDirectories: true)
+            }
+            let copy = videoFolder.appending(path: "\(UUID()).mp4")
+
+            if FileManager.default.fileExists(atPath: copy.path()) {
+                try FileManager.default.removeItem(at: copy)
+            }
+
+            try FileManager.default.copyItem(at: received.file, to: copy)
+            return Self.init(url: copy)
+        }
+    }
+}
+
+enum LoadState {
+    case unknown, loading, loaded(Movie), failed
+}
+
+struct LoadInfo: Identifiable, Equatable {
+    static func == (lhs: LoadInfo, rhs: LoadInfo) -> Bool {
+        lhs.id == rhs.id
+    }
+    
+    var id = UUID()
+    var autoReverses: Bool = false
+    var loadState: LoadState
+}
+
 class VideoHandler {
+    static let MaxDurationSecs = 12.0
+    
+    static func isVideoTooLong(at url: URL) -> Bool {
+        let asset = AVAsset(url: url)
+
+        let duration = asset.duration
+        let durationTime = CMTimeGetSeconds(duration)
+        
+        return durationTime > MaxDurationSecs
+    }
+    
     static func createCaml(from url: URL, autoReverses: Bool) throws -> URL {
         // copy the resources
         let descrURL = SymHandler.getDocumentsDirectory().appendingPathComponent(UUID().uuidString, conformingTo: .directory)