added envs for unstructured to control OCR quality and OCR languages

nextcloud_mcp_server/config.py

@@ -60,3 +60,63 @@ def is_unstructured_parsing_enabled() -> bool:
         True if enabled, False otherwise.
     """
     return os.getenv("ENABLE_UNSTRUCTURED_PARSING", "true").lower() == "true"
+
+
+def get_unstructured_strategy() -> str:
+    """Get the parsing strategy for the Unstructured API.
+    
+    Valid values are:
+    - 'auto': Automatically choose the best strategy (default)
+    - 'fast': Fast parsing without OCR
+    - 'hi_res': High-resolution parsing with OCR for better accuracy
+    
+    Returns:
+        The parsing strategy to use.
+    """
+    strategy = os.getenv("UNSTRUCTURED_STRATEGY", "auto").lower()
+    valid_strategies = ["auto", "fast", "hi_res"]
+    
+    if strategy not in valid_strategies:
+        logging.warning(
+            f"Invalid UNSTRUCTURED_STRATEGY '{strategy}'. Using 'hi_res'. "
+            f"Valid options: {', '.join(valid_strategies)}"
+        )
+        return "hi_res"
+    
+    return strategy
+
+
+def get_unstructured_languages() -> list[str]:
+    """Get the OCR languages for the Unstructured API.
+    
+    Languages should be specified as ISO 639-3 codes (e.g., 'eng', 'deu', 'fra').
+    Multiple languages can be specified separated by commas.
+    
+    Default languages: English (eng) and German (deu)
+    
+    Common language codes:
+    - eng: English
+    - deu: German
+    - fra: French
+    - spa: Spanish
+    - ita: Italian
+    - por: Portuguese
+    - rus: Russian
+    - ara: Arabic
+    - zho: Chinese
+    - jpn: Japanese
+    - kor: Korean
+    
+    Returns:
+        List of language codes for OCR processing.
+    """
+    languages_str = os.getenv("UNSTRUCTURED_LANGUAGES", "eng,deu")
+    
+    # Split by comma and clean up whitespace
+    languages = [lang.strip() for lang in languages_str.split(",") if lang.strip()]
+    
+    if not languages:
+        logging.warning("No languages specified in UNSTRUCTURED_LANGUAGES. Using default: eng,deu")
+        return ["eng", "deu"]
+    
+    return languages