fixed a bug:translate maybe timeout

ios/OralTrainer/Config.swift

@@ -15,7 +15,7 @@ enum AppConfig {
     static let connectTimeout: TimeInterval = 15
     static let readTimeout: TimeInterval = 30
     static let assessmentTimeout: TimeInterval = 180
-    static let translationTimeout: TimeInterval = 120
+    static let translationTimeout: TimeInterval = 180
 
     static let sha256Pattern = #"^[0-9a-fA-F]{64}$"#
 

ios/OralTrainer/Services/SentenceBoundaryAPI.swift

@@ -100,7 +100,29 @@ extension SentenceBoundaryAPI {
             .explanation
     }
 
+    static func fetchStoredSubtitles(videoHash: String) async throws -> [Int: String] {
+        try await requestSubtitles(videoHash: videoHash, method: "GET", timeout: AppConfig.readTimeout)
+    }
+
     static func translateSubtitles(videoHash: String) async throws -> [Int: String] {
+        try await requestSubtitles(videoHash: videoHash, method: "POST", timeout: AppConfig.translationTimeout)
+    }
+
+    static func loadSubtitles(videoHash: String, expectedIndexes: [Int]) async throws -> [Int: String] {
+        if let stored = try? await fetchStoredSubtitles(videoHash: videoHash) {
+            let expected = Set(expectedIndexes)
+            if expected.isEmpty || expected.isSubset(of: Set(stored.keys)) {
+                return stored
+            }
+        }
+        return try await translateSubtitles(videoHash: videoHash)
+    }
+
+    private static func requestSubtitles(
+        videoHash: String,
+        method: String,
+        timeout: TimeInterval
+    ) async throws -> [Int: String] {
         let hash = videoHash.lowercased()
         guard hash.range(of: AppConfig.sha256Pattern, options: .regularExpression) != nil else {
             throw SentenceBoundaryAPIError.invalidHash
@@ -112,8 +134,8 @@ extension SentenceBoundaryAPI {
         let result = try await HTTPClient.execute(
             baseURL: AppConfig.serverBaseURL,
             path: "api/v1/videos/\(hash)/subtitle-translation",
-            method: "POST",
-            timeout: AppConfig.translationTimeout,
+            method: method,
+            timeout: timeout,
             headers: headers
         )
         guard (200...299).contains(result.statusCode) else {

ios/OralTrainer/Views/RootView.swift

@@ -649,7 +649,14 @@ struct RootView: View {
         let mediaId = item.id
         chineseTranslationTask = Task {
             do {
-                let map = try await SentenceBoundaryAPI.translateSubtitles(videoHash: mediaId)
+                let expectedIndexes = item.sentences.compactMap { sentence -> Int? in
+                    let text = (sentence.text ?? "").trimmingCharacters(in: .whitespacesAndNewlines)
+                    return text.isEmpty ? nil : sentence.index
+                }
+                let map = try await SentenceBoundaryAPI.loadSubtitles(
+                    videoHash: mediaId,
+                    expectedIndexes: expectedIndexes
+                )
                 guard !Task.isCancelled else { return }
                 await MainActor.run {
                     guard controller.currentItem?.id == mediaId else { return }