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backend/app/routers/translation.py

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+"""
+Tool_OCR - Translation Router (RESERVED)
+Stub endpoints for future translation feature
+"""
+
+import logging
+from typing import List
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+
+from app.core.deps import get_db, get_current_active_user
+from app.models.user import User
+from app.schemas.translation import (
+    TranslationRequest,
+    TranslationResponse,
+    TranslationFeatureStatus,
+    LanguageInfo,
+)
+from app.services.translation_service import StubTranslationService
+
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/v1/translate", tags=["Translation (RESERVED)"])
+
+
+@router.get("/status", response_model=TranslationFeatureStatus, summary="Get translation feature status")
+async def get_translation_status():
+    """
+    Get translation feature status
+
+    Returns current implementation status and roadmap for translation feature.
+    This is a RESERVED feature that will be implemented in Phase 5.
+
+    **Status**: RESERVED - Not yet implemented
+    **Phase**: Phase 5 (Post-production)
+    **Priority**: Implemented after production deployment and user feedback
+    """
+    return StubTranslationService.get_feature_status()
+
+
+@router.get("/languages", response_model=List[LanguageInfo], summary="Get supported languages")
+async def get_supported_languages():
+    """
+    Get list of languages planned for translation support
+
+    Returns list of languages that will be supported when translation
+    feature is implemented.
+
+    **Status**: RESERVED - Planning phase
+    """
+    return StubTranslationService.get_supported_languages()
+
+
+@router.post("/document", response_model=TranslationResponse, summary="Translate document (RESERVED)")
+async def translate_document(
+    request: TranslationRequest,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """
+    Translate OCR document (RESERVED - NOT IMPLEMENTED)
+
+    This endpoint is reserved for future translation functionality.
+    Returns 501 Not Implemented status.
+
+    **Expected Functionality** (when implemented):
+    - Translate markdown documents while preserving structure
+    - Support multiple translation engines (offline, ERNIE, Google, DeepL)
+    - Maintain layout and formatting
+    - Handle technical terminology
+
+    **Planned Features**:
+    - Offline translation (Argos Translate)
+    - Cloud API integration (ERNIE, Google, DeepL)
+    - Batch translation support
+    - Translation memory
+    - Glossary support
+
+    **Current Status**: RESERVED for Phase 5 implementation
+
+    ---
+
+    **Request Parameters** (planned):
+    - **file_id**: ID of OCR result file to translate
+    - **source_lang**: Source language code (zh, en, ja, ko)
+    - **target_lang**: Target language code (zh, en, ja, ko)
+    - **engine_type**: Translation engine (offline, ernie, google, deepl)
+    - **preserve_structure**: Whether to preserve markdown structure
+    - **engine_config**: Engine-specific configuration
+
+    **Response** (planned):
+    - **task_id**: Translation task ID for tracking progress
+    - **status**: Translation status
+    - **translated_file_path**: Path to translated file (when completed)
+    """
+    logger.info(f"Translation request received from user {current_user.id} (stub endpoint)")
+
+    # Return 501 Not Implemented with informative message
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail={
+            "error": "Translation feature not implemented",
+            "message": "This feature is reserved for future development (Phase 5)",
+            "status": "RESERVED",
+            "roadmap": {
+                "phase": "Phase 5",
+                "priority": "Implemented after production deployment",
+                "planned_features": [
+                    "Offline translation (Argos Translate)",
+                    "Cloud API integration (ERNIE, Google, DeepL)",
+                    "Structure-preserving markdown translation",
+                    "Batch translation support"
+                ]
+            },
+            "request_received": {
+                "file_id": request.file_id,
+                "source_lang": request.source_lang,
+                "target_lang": request.target_lang,
+                "engine_type": request.engine_type
+            },
+            "action": "Please check back in a future release or contact support for updates"
+        }
+    )
+
+
+@router.get("/task/{task_id}", summary="Get translation task status (RESERVED)")
+async def get_translation_task_status(
+    task_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """
+    Get translation task status (RESERVED - NOT IMPLEMENTED)
+
+    This endpoint would track translation task progress.
+    Returns 501 Not Implemented status.
+
+    **Planned Functionality**:
+    - Real-time translation progress
+    - Status updates (pending, processing, completed, failed)
+    - Estimated completion time
+    - Error reporting
+
+    **Current Status**: RESERVED for Phase 5 implementation
+    """
+    logger.info(f"Translation status check for task {task_id} from user {current_user.id} (stub endpoint)")
+
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail={
+            "error": "Translation feature not implemented",
+            "message": "Translation task tracking is reserved for Phase 5",
+            "task_id": task_id,
+            "status": "RESERVED"
+        }
+    )
+
+
+@router.delete("/task/{task_id}", summary="Cancel translation task (RESERVED)")
+async def cancel_translation_task(
+    task_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """
+    Cancel ongoing translation task (RESERVED - NOT IMPLEMENTED)
+
+    This endpoint would allow cancellation of translation tasks.
+    Returns 501 Not Implemented status.
+
+    **Planned Functionality**:
+    - Cancel in-progress translations
+    - Clean up temporary files
+    - Refund credits (if applicable)
+
+    **Current Status**: RESERVED for Phase 5 implementation
+    """
+    logger.info(f"Translation cancellation request for task {task_id} from user {current_user.id} (stub endpoint)")
+
+    raise HTTPException(
+        status_code=status.HTTP_501_NOT_IMPLEMENTED,
+        detail={
+            "error": "Translation feature not implemented",
+            "message": "This feature is reserved for Phase 5",
+            "status": "RESERVED"
+        }
+    )