add a retranslate chinese function

sentence_api/main.py

@@ -46,6 +46,8 @@ from .models import (
     SentenceBoundaryDocument,
     SentenceExplanationRequest,
     SentenceExplanationResponse,
+    AdminSubtitleTranslationResponse,
+    SubtitleRetranslateRequest,
     SubtitleTranslationResponse,
     PasswordResetRequest,
     SentenceTextUpdate,
@@ -668,6 +670,41 @@ def create_app(
         background_tasks.add_task(_process_safely, processor, video_hash)
         return {"video_hash": video_hash.lower(), "status": "processing_queued"}
 
+    @application.get(
+        "/api/v1/admin/videos/{video_hash}/subtitle-translation",
+        response_model=AdminSubtitleTranslationResponse,
+        dependencies=[Depends(require_admin)],
+    )
+    def get_admin_subtitle_translation(
+        video_hash: str = SHA256_PATH,
+    ) -> AdminSubtitleTranslationResponse:
+        snapshot = application.state.subtitle_translations.admin_snapshot(video_hash)
+        if snapshot is None:
+            raise HTTPException(status_code=404, detail="Course is not available.")
+        return snapshot
+
+    @application.post(
+        "/api/v1/admin/videos/{video_hash}/subtitle-translation",
+        response_model=AdminSubtitleTranslationResponse,
+        dependencies=[Depends(require_admin)],
+    )
+    def retranslate_subtitles(
+        payload: Optional[SubtitleRetranslateRequest] = None,
+        video_hash: str = SHA256_PATH,
+    ) -> AdminSubtitleTranslationResponse:
+        request = payload or SubtitleRetranslateRequest()
+        try:
+            return application.state.subtitle_translations.retranslate(
+                video_hash,
+                terms=[(item.source, item.zh) for item in request.terms],
+            )
+        except KeyError:
+            raise HTTPException(status_code=404, detail="Course is not available.") from None
+        except ValueError as exc:
+            raise HTTPException(status_code=422, detail=str(exc)) from exc
+        except AITutorError as exc:
+            raise HTTPException(status_code=503, detail=str(exc)) from exc
+
     @application.put(
         "/api/v1/admin/videos/{video_hash}/title",
         response_model=VideoSummary,