add a retranslate chinese function

sentence_api/translation_jobs.py

@@ -7,7 +7,13 @@ import threading
 from dataclasses import dataclass
 
 from .ai_tutor import AITutor, AITutorError
-from .models import SentenceBoundaryDocument, SubtitleTranslationItem, SubtitleTranslationResponse
+from .models import (
+    AdminSubtitleTranslationResponse,
+    SentenceBoundaryDocument,
+    SubtitleTranslationItem,
+    SubtitleTranslationResponse,
+    TranslationTerm,
+)
 from .repository import VideoRepository
 
 
@@ -110,6 +116,34 @@ class SubtitleTranslationService:
         except (KeyError, ValueError, AITutorError):
             logger.exception("Could not restart subtitle translation: video=%s", video_hash)
 
+    def admin_snapshot(self, video_hash: str) -> AdminSubtitleTranslationResponse | None:
+        current = self.current(video_hash)
+        if current is None:
+            return None
+        return self._with_terms(current)
+
+    def retranslate(
+        self,
+        video_hash: str,
+        terms: list[tuple[str, str]] | None = None,
+    ) -> AdminSubtitleTranslationResponse:
+        if self.repository.get_video(video_hash) is None:
+            raise KeyError(video_hash)
+        if terms is not None:
+            self.repository.save_translation_glossary(video_hash, terms)
+        self.invalidate(video_hash)
+        self.repository.clear_sentence_translations(video_hash)
+        return self._with_terms(self.ensure(video_hash))
+
+    def _with_terms(self, snapshot: SubtitleTranslationResponse) -> AdminSubtitleTranslationResponse:
+        terms = [
+            TranslationTerm(source=source, zh=zh)
+            for source, zh in self.repository.get_translation_glossary(snapshot.video_hash)
+        ]
+        payload = snapshot.model_dump()
+        payload["terms"] = terms
+        return AdminSubtitleTranslationResponse(**payload)
+
     def ensure(self, video_hash: str) -> SubtitleTranslationResponse:
         if not getattr(self.ai_tutor, "available", False):
             raise AITutorError("AI translation is not configured.")
@@ -200,6 +234,7 @@ class SubtitleTranslationService:
                 course_title=(video["title"] if video is not None else "") or "",
                 existing=existing,
                 persist=lambda part: self._persist(job, part),
+                terms=self.repository.get_translation_glossary(job.video_hash),
             )
             if translated:
                 self._persist(job, translated)