fixed some bugs

ios/OralTrainer/Services/TrainingHistoryStore.swift

@@ -0,0 +1,167 @@
+import Foundation
+
+struct PersistedRecording {
+    let audioURL: URL
+    let rawURL: URL
+}
+
+struct TrainingHistorySnapshot {
+    var audioSegments: [Int: URL] = [:]
+    var rawSegments: [Int: URL] = [:]
+    var scores: [Int: ImitationAssessmentResult] = [:]
+}
+
+@MainActor
+final class TrainingHistoryManager: ObservableObject {
+    @Published private(set) var historyVersion = 0
+    let store = TrainingHistoryStore()
+
+    func notifyHistoryChanged() {
+        historyVersion += 1
+    }
+}
+
+final class TrainingHistoryStore {
+    private let root: URL
+
+    init() {
+        let documents = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
+        root = documents.appendingPathComponent("TrainingHistory", isDirectory: true)
+        try? FileManager.default.createDirectory(at: root, withIntermediateDirectories: true)
+    }
+
+    func normalizedVideoHash(_ videoHash: String) -> String {
+        let allowed = CharacterSet(charactersIn: "0123456789abcdefABCDEF")
+        let filtered = videoHash.lowercased().unicodeScalars.filter { allowed.contains($0) }
+        return String(String.UnicodeScalarView(filtered))
+    }
+
+    private var userDirectory: URL {
+        let identifier = normalizedVideoHash(AppConfig.currentUserId)
+        return root.appendingPathComponent(identifier.isEmpty ? "anonymous" : identifier, isDirectory: true)
+    }
+
+    func load(videoHash: String) -> TrainingHistorySnapshot {
+        let directory = courseDirectory(videoHash)
+        var snapshot = TrainingHistorySnapshot()
+        for index in 0..<500 {
+            let audio = directory.appendingPathComponent(String(format: "segment-%04d.m4a", index))
+            let raw = directory.appendingPathComponent(String(format: "raw-%04d.caf", index))
+            if FileManager.default.fileExists(atPath: audio.path) {
+                snapshot.audioSegments[index] = audio
+            }
+            if FileManager.default.fileExists(atPath: raw.path) {
+                snapshot.rawSegments[index] = raw
+            }
+        }
+
+        let scoreFile = directory.appendingPathComponent("scores.json")
+        if let data = try? Data(contentsOf: scoreFile),
+           let object = try? JSONSerialization.jsonObject(with: data) as? [String: Any] {
+            for (key, value) in object {
+                guard let index = Int(key), index >= 0 else { continue }
+                if let payload = value as? [String: Any],
+                   let payloadData = try? JSONSerialization.data(withJSONObject: payload),
+                   let score = try? JSONDecoder().decode(ImitationAssessmentResult.self, from: payloadData) {
+                    snapshot.scores[index] = score
+                }
+            }
+        }
+        return snapshot
+    }
+
+    func saveSegment(
+        videoHash: String,
+        sentenceIndex: Int,
+        audioURL: URL,
+        rawURL: URL
+    ) throws -> PersistedRecording {
+        let directory = courseDirectory(videoHash)
+        try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+        let savedAudio = directory.appendingPathComponent(
+            String(format: "segment-%04d.m4a", sentenceIndex)
+        )
+        let savedRaw = directory.appendingPathComponent(
+            String(format: "raw-%04d.caf", sentenceIndex)
+        )
+        try? FileManager.default.removeItem(at: savedAudio)
+        try? FileManager.default.removeItem(at: savedRaw)
+        try FileManager.default.moveItem(at: audioURL, to: savedAudio)
+        try FileManager.default.moveItem(at: rawURL, to: savedRaw)
+        return PersistedRecording(audioURL: savedAudio, rawURL: savedRaw)
+    }
+
+    func audioDestination(videoHash: String, sentenceIndex: Int) -> URL {
+        courseDirectory(videoHash).appendingPathComponent(
+            String(format: "segment-%04d.m4a", sentenceIndex)
+        )
+    }
+
+    func saveScores(
+        videoHash: String,
+        scores: [Int: ImitationAssessmentResult]
+    ) {
+        let directory = courseDirectory(videoHash)
+        do {
+            try FileManager.default.createDirectory(at: directory, withIntermediateDirectories: true)
+            var object: [String: Any] = [:]
+            for (index, score) in scores {
+                object[String(index)] = Self.payload(score)
+            }
+            let data = try JSONSerialization.data(withJSONObject: object, options: [.sortedKeys])
+            try data.write(
+                to: directory.appendingPathComponent("scores.json"),
+                options: [.atomic]
+            )
+        } catch {
+            // History persistence is best-effort; the server remains the source of record.
+        }
+    }
+
+    func removeScore(videoHash: String, sentenceIndex: Int) {
+        var snapshot = load(videoHash: videoHash)
+        snapshot.scores[sentenceIndex] = nil
+        saveScores(videoHash: videoHash, scores: snapshot.scores)
+    }
+
+    func removeAllAudio(videoHash: String) {
+        let snapshot = load(videoHash: videoHash)
+        for url in snapshot.audioSegments.values {
+            try? FileManager.default.removeItem(at: url)
+        }
+        for url in snapshot.rawSegments.values {
+            try? FileManager.default.removeItem(at: url)
+        }
+    }
+
+    private func courseDirectory(_ videoHash: String) -> URL {
+        userDirectory.appendingPathComponent(normalizedVideoHash(videoHash), isDirectory: true)
+    }
+
+    private static func payload(_ score: ImitationAssessmentResult) -> [String: Any] {
+        var value: [String: Any] = ["overall_score": score.overallScore]
+        if let item = score.passed { value["passed"] = item }
+        if let item = score.passScore { value["pass_score"] = item }
+        if let item = score.contentScore { value["content_score"] = item }
+        if let item = score.completenessScore { value["completeness_score"] = item }
+        if let item = score.fluencyScore { value["fluency_score"] = item }
+        if let item = score.pronunciationScore { value["pronunciation_score"] = item }
+        if let item = score.prosodyScore { value["prosody_score"] = item }
+        if let item = score.durationScore { value["duration_score"] = item }
+        if let item = score.pauseScore { value["pause_score"] = item }
+        if let item = score.speechRateScore { value["speech_rate_score"] = item }
+        if let item = score.referenceText { value["reference_text"] = item }
+        if let item = score.recognizedText { value["recognized_text"] = item }
+        if let item = score.durationRatio { value["duration_ratio"] = item }
+        if !score.missingTokens.isEmpty { value["missing_tokens"] = score.missingTokens }
+        if !score.extraTokens.isEmpty { value["extra_tokens"] = score.extraTokens }
+        if !score.substitutions.isEmpty {
+            value["substitutions"] = score.substitutions.map {
+                ["expected": $0.expected, "actual": $0.actual]
+            }
+        }
+        if let item = score.feedback { value["feedback"] = item }
+        if !score.details.isEmpty { value["details"] = score.details }
+        return value
+    }
+}