first

backend/app/services/translation_service.py

@@ -0,0 +1,282 @@
+"""
+Tool_OCR - Translation Service (RESERVED)
+Abstract interface and stub implementation for future translation feature
+"""
+
+from abc import ABC, abstractmethod
+from typing import Dict, Optional, List
+from enum import Enum
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+class TranslationEngine(str, Enum):
+    """Supported translation engines"""
+    OFFLINE = "offline"  # Argos Translate (offline)
+    ERNIE = "ernie"  # Baidu ERNIE API
+    GOOGLE = "google"  # Google Translate API
+    DEEPL = "deepl"  # DeepL API
+
+
+class LanguageCode(str, Enum):
+    """Supported language codes"""
+    CHINESE = "zh"
+    ENGLISH = "en"
+    JAPANESE = "ja"
+    KOREAN = "ko"
+    FRENCH = "fr"
+    GERMAN = "de"
+    SPANISH = "es"
+
+
+class TranslationServiceInterface(ABC):
+    """
+    Abstract interface for translation services
+
+    This interface defines the contract for all translation engine implementations.
+    Future implementations should inherit from this class.
+    """
+
+    @abstractmethod
+    def translate_text(
+        self,
+        text: str,
+        source_lang: str,
+        target_lang: str,
+        **kwargs
+    ) -> str:
+        """
+        Translate a single text string
+
+        Args:
+            text: Text to translate
+            source_lang: Source language code
+            target_lang: Target language code
+            **kwargs: Engine-specific parameters
+
+        Returns:
+            str: Translated text
+        """
+        pass
+
+    @abstractmethod
+    def translate_document(
+        self,
+        markdown_content: str,
+        source_lang: str,
+        target_lang: str,
+        preserve_structure: bool = True,
+        **kwargs
+    ) -> Dict[str, any]:
+        """
+        Translate a Markdown document while preserving structure
+
+        Args:
+            markdown_content: Markdown content to translate
+            source_lang: Source language code
+            target_lang: Target language code
+            preserve_structure: Whether to preserve markdown structure
+            **kwargs: Engine-specific parameters
+
+        Returns:
+            Dict containing:
+                - translated_content: Translated markdown
+                - metadata: Translation metadata (engine, time, etc.)
+        """
+        pass
+
+    @abstractmethod
+    def batch_translate(
+        self,
+        texts: List[str],
+        source_lang: str,
+        target_lang: str,
+        **kwargs
+    ) -> List[str]:
+        """
+        Translate multiple texts in batch
+
+        Args:
+            texts: List of texts to translate
+            source_lang: Source language code
+            target_lang: Target language code
+            **kwargs: Engine-specific parameters
+
+        Returns:
+            List[str]: List of translated texts
+        """
+        pass
+
+    @abstractmethod
+    def get_supported_languages(self) -> List[str]:
+        """
+        Get list of supported language codes for this engine
+
+        Returns:
+            List[str]: List of supported language codes
+        """
+        pass
+
+    @abstractmethod
+    def validate_config(self) -> bool:
+        """
+        Validate engine configuration (API keys, model files, etc.)
+
+        Returns:
+            bool: True if configuration is valid
+        """
+        pass
+
+
+class TranslationEngineFactory:
+    """
+    Factory for creating translation engine instances
+
+    RESERVED: This is a placeholder for future implementation.
+    When translation feature is implemented, this factory will instantiate
+    the appropriate translation engine based on configuration.
+    """
+
+    @staticmethod
+    def create_engine(
+        engine_type: TranslationEngine,
+        config: Optional[Dict] = None
+    ) -> TranslationServiceInterface:
+        """
+        Create a translation engine instance
+
+        Args:
+            engine_type: Type of translation engine
+            config: Engine-specific configuration
+
+        Returns:
+            TranslationServiceInterface: Translation engine instance
+
+        Raises:
+            NotImplementedError: Always raised (stub implementation)
+        """
+        raise NotImplementedError(
+            "Translation feature is not yet implemented. "
+            "This is a reserved placeholder for future development."
+        )
+
+    @staticmethod
+    def get_available_engines() -> List[str]:
+        """
+        Get list of available translation engines
+
+        Returns:
+            List[str]: List of engine types (currently empty)
+        """
+        return []
+
+    @staticmethod
+    def is_engine_available(engine_type: TranslationEngine) -> bool:
+        """
+        Check if a specific engine is available
+
+        Args:
+            engine_type: Engine type to check
+
+        Returns:
+            bool: Always False (stub implementation)
+        """
+        return False
+
+
+class StubTranslationService:
+    """
+    Stub translation service for API endpoints
+
+    This service provides placeholder responses for translation endpoints
+    until the feature is fully implemented.
+    """
+
+    @staticmethod
+    def get_feature_status() -> Dict[str, any]:
+        """
+        Get translation feature status
+
+        Returns:
+            Dict with feature status information
+        """
+        return {
+            "available": False,
+            "status": "reserved",
+            "message": "Translation feature is reserved for future implementation",
+            "supported_engines": [],
+            "planned_engines": [
+                {
+                    "type": "offline",
+                    "name": "Argos Translate",
+                    "description": "Offline neural translation",
+                    "status": "planned"
+                },
+                {
+                    "type": "ernie",
+                    "name": "Baidu ERNIE",
+                    "description": "Baidu AI translation API",
+                    "status": "planned"
+                },
+                {
+                    "type": "google",
+                    "name": "Google Translate",
+                    "description": "Google Cloud Translation API",
+                    "status": "planned"
+                },
+                {
+                    "type": "deepl",
+                    "name": "DeepL",
+                    "description": "DeepL translation API",
+                    "status": "planned"
+                }
+            ],
+            "roadmap": {
+                "phase": "Phase 5",
+                "priority": "low",
+                "implementation_after": "Production deployment and user feedback"
+            }
+        }
+
+    @staticmethod
+    def get_supported_languages() -> List[Dict[str, str]]:
+        """
+        Get list of languages planned for translation support
+
+        Returns:
+            List of language info dicts
+        """
+        return [
+            {"code": "zh", "name": "Chinese (Simplified)", "status": "planned"},
+            {"code": "en", "name": "English", "status": "planned"},
+            {"code": "ja", "name": "Japanese", "status": "planned"},
+            {"code": "ko", "name": "Korean", "status": "planned"},
+            {"code": "fr", "name": "French", "status": "planned"},
+            {"code": "de", "name": "German", "status": "planned"},
+            {"code": "es", "name": "Spanish", "status": "planned"},
+        ]
+
+
+# Example placeholder for future engine implementations:
+#
+# class ArgosTranslationEngine(TranslationServiceInterface):
+#     """Offline translation using Argos Translate"""
+#     def __init__(self, model_path: str):
+#         self.model_path = model_path
+#         # Initialize Argos models
+#
+#     def translate_text(self, text, source_lang, target_lang, **kwargs):
+#         # Implementation here
+#         pass
+#
+# class ERNIETranslationEngine(TranslationServiceInterface):
+#     """Baidu ERNIE API translation"""
+#     def __init__(self, api_key: str, api_secret: str):
+#         self.api_key = api_key
+#         self.api_secret = api_secret
+#
+#     def translate_text(self, text, source_lang, target_lang, **kwargs):
+#         # Implementation here
+#         pass