NO docker

app/services/__init__.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+業務服務模組
+
+Author: PANJIT IT Team
+Created: 2024-01-28
+Modified: 2024-01-28
+"""
+
+from .dify_client import DifyClient
+from .translation_service import TranslationService
+from .notification_service import NotificationService
+
+__all__ = [
+    'DifyClient',
+    'TranslationService', 
+    'NotificationService'
+]

app/services/celery_service.py

@@ -0,0 +1,137 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Celery任務管理服務
+
+Author: PANJIT IT Team
+Created: 2025-09-04
+"""
+
+from celery import Celery
+from app.utils.logger import get_logger
+import os
+
+logger = get_logger(__name__)
+
+
+def get_celery_app():
+    """取得Celery應用實例"""
+    try:
+        from celery_app import app as celery_app
+        return celery_app
+    except ImportError:
+        # 如果無法導入，創建一個簡單的Celery實例
+        broker_url = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
+        celery_app = Celery('translation_worker', broker=broker_url)
+        return celery_app
+
+
+def revoke_task(job_uuid):
+    """
+    撤銷指定任務的Celery任務
+    
+    Args:
+        job_uuid (str): 任務UUID
+        
+    Returns:
+        bool: 撤銷是否成功
+    """
+    try:
+        celery_app = get_celery_app()
+        
+        # Celery任務ID通常與job_uuid相同或相關
+        task_id = f"translate_document_{job_uuid}"
+        
+        # 嘗試撤銷任務
+        celery_app.control.revoke(task_id, terminate=True, signal='SIGKILL')
+        
+        logger.info(f"Successfully revoked Celery task: {task_id}")
+        return True
+        
+    except Exception as e:
+        logger.error(f"Failed to revoke Celery task for job {job_uuid}: {str(e)}")
+        return False
+
+
+def get_active_tasks():
+    """
+    取得當前活躍的Celery任務
+    
+    Returns:
+        list: 活躍任務列表
+    """
+    try:
+        celery_app = get_celery_app()
+        
+        # 取得活躍任務
+        inspect = celery_app.control.inspect()
+        active_tasks = inspect.active()
+        
+        if active_tasks:
+            return active_tasks
+        else:
+            return {}
+            
+    except Exception as e:
+        logger.error(f"Failed to get active tasks: {str(e)}")
+        return {}
+
+
+def is_task_active(job_uuid):
+    """
+    檢查指定任務是否在Celery中活躍
+    
+    Args:
+        job_uuid (str): 任務UUID
+        
+    Returns:
+        bool: 任務是否活躍
+    """
+    try:
+        active_tasks = get_active_tasks()
+        task_id = f"translate_document_{job_uuid}"
+        
+        # 檢查所有worker的活躍任務
+        for worker, tasks in active_tasks.items():
+            for task in tasks:
+                if task.get('id') == task_id:
+                    return True
+        
+        return False
+        
+    except Exception as e:
+        logger.error(f"Failed to check if task is active for job {job_uuid}: {str(e)}")
+        return False
+
+
+def cleanup_stale_tasks():
+    """
+    清理卡住的Celery任務
+    
+    Returns:
+        int: 清理的任務數量
+    """
+    try:
+        from app.models.job import TranslationJob
+        from datetime import datetime, timedelta
+        
+        # 找出超過30分鐘仍在處理中的任務
+        stale_threshold = datetime.utcnow() - timedelta(minutes=30)
+        stale_jobs = TranslationJob.query.filter(
+            TranslationJob.status == 'PROCESSING',
+            TranslationJob.processing_started_at < stale_threshold
+        ).all()
+        
+        cleanup_count = 0
+        for job in stale_jobs:
+            if not is_task_active(job.job_uuid):
+                # 任務不在Celery中活躍，標記為失敗
+                job.update_status('FAILED', error_message='任務處理超時，已自動取消')
+                cleanup_count += 1
+                logger.info(f"Cleaned up stale job: {job.job_uuid}")
+        
+        return cleanup_count
+        
+    except Exception as e:
+        logger.error(f"Failed to cleanup stale tasks: {str(e)}")
+        return 0

app/services/dify_client.py

@@ -0,0 +1,494 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Dify API 客戶端服務
+
+Author: PANJIT IT Team
+Created: 2024-01-28
+Modified: 2024-01-28
+"""
+
+import time
+import requests
+from typing import Dict, Any, Optional
+from flask import current_app
+from app.utils.logger import get_logger
+from app.utils.exceptions import APIError
+from app.models.stats import APIUsageStats
+
+logger = get_logger(__name__)
+
+
+class DifyClient:
+    """Dify API 客戶端"""
+    
+    def __init__(self):
+        # 翻译API配置
+        self.translation_base_url = current_app.config.get('DIFY_TRANSLATION_BASE_URL', '')
+        self.translation_api_key = current_app.config.get('DIFY_TRANSLATION_API_KEY', '')
+
+        # OCR API配置
+        self.ocr_base_url = current_app.config.get('DIFY_OCR_BASE_URL', '')
+        self.ocr_api_key = current_app.config.get('DIFY_OCR_API_KEY', '')
+
+        self.timeout = (10, 60)  # (連接超時, 讀取超時)
+        self.max_retries = 3
+        self.retry_delay = 1.6  # 指數退避基數
+
+        if not self.translation_base_url or not self.translation_api_key:
+            logger.warning("Dify Translation API configuration is incomplete")
+
+        if not self.ocr_base_url or not self.ocr_api_key:
+            logger.warning("Dify OCR API configuration is incomplete")
+    
+    def _make_request(self, method: str, endpoint: str, data: Dict[str, Any] = None,
+                     user_id: int = None, job_id: int = None, files_data: Dict = None,
+                     api_type: str = 'translation') -> Dict[str, Any]:
+        """發送 HTTP 請求到 Dify API"""
+
+        # 根据API类型选择配置
+        if api_type == 'ocr':
+            base_url = self.ocr_base_url
+            api_key = self.ocr_api_key
+            if not base_url or not api_key:
+                raise APIError("Dify OCR API 未配置完整")
+        else:  # translation
+            base_url = self.translation_base_url
+            api_key = self.translation_api_key
+            if not base_url or not api_key:
+                raise APIError("Dify Translation API 未配置完整")
+
+        url = f"{base_url.rstrip('/')}/{endpoint.lstrip('/')}"
+
+        headers = {
+            'Authorization': f'Bearer {api_key}',
+            'User-Agent': 'PANJIT-Document-Translator/1.0'
+        }
+
+        # 只有在非文件上传时才设置JSON Content-Type
+        if not files_data:
+            headers['Content-Type'] = 'application/json'
+        
+        # 重試邏輯
+        last_exception = None
+        start_time = time.time()
+        
+        for attempt in range(self.max_retries):
+            try:
+                # logger.debug(f"Making Dify API request: {method} {url} (attempt {attempt + 1})")
+                
+                if method.upper() == 'GET':
+                    response = requests.get(url, headers=headers, timeout=self.timeout, params=data)
+                elif files_data:
+                    # 文件上传请求，使用multipart/form-data
+                    response = requests.post(url, headers=headers, timeout=self.timeout, files=files_data, data=data)
+                else:
+                    # 普通JSON请求
+                    response = requests.post(url, headers=headers, timeout=self.timeout, json=data)
+                
+                # 計算響應時間
+                response_time_ms = int((time.time() - start_time) * 1000)
+                
+                # 檢查響應狀態
+                response.raise_for_status()
+                
+                # 解析響應
+                result = response.json()
+                
+                # 記錄 API 使用統計
+                if user_id:
+                    self._record_api_usage(
+                        user_id=user_id,
+                        job_id=job_id,
+                        endpoint=endpoint,
+                        response_data=result,
+                        response_time_ms=response_time_ms,
+                        success=True
+                    )
+                
+                # logger.debug(f"Dify API request successful: {response_time_ms}ms")
+                return result
+            
+            except requests.exceptions.RequestException as e:
+                last_exception = e
+                response_time_ms = int((time.time() - start_time) * 1000)
+                
+                # 記錄失敗的 API 調用
+                if user_id:
+                    self._record_api_usage(
+                        user_id=user_id,
+                        job_id=job_id,
+                        endpoint=endpoint,
+                        response_data={},
+                        response_time_ms=response_time_ms,
+                        success=False,
+                        error_message=str(e)
+                    )
+                
+                logger.warning(f"Dify API request failed (attempt {attempt + 1}): {str(e)}")
+                
+                # 如果是最後一次嘗試，拋出異常
+                if attempt == self.max_retries - 1:
+                    break
+                
+                # 指數退避
+                delay = self.retry_delay ** attempt
+                # logger.debug(f"Retrying in {delay} seconds...")
+                time.sleep(delay)
+        
+        # 所有重試都失敗了
+        error_msg = f"Dify API request failed after {self.max_retries} attempts: {str(last_exception)}"
+        logger.error(error_msg)
+        raise APIError(error_msg)
+    
+    def _record_api_usage(self, user_id: int, job_id: Optional[int], endpoint: str, 
+                         response_data: Dict, response_time_ms: int, success: bool, 
+                         error_message: str = None):
+        """記錄 API 使用統計"""
+        try:
+            # 從響應中提取使用量資訊
+            metadata = response_data.get('metadata', {})
+            
+            # 如果 job_id 無效，則設為 None 以避免外鍵約束錯誤
+            APIUsageStats.record_api_call(
+                user_id=user_id,
+                job_id=job_id,  # 已經是 Optional，如果無效會被設為 NULL
+                api_endpoint=endpoint,
+                metadata=metadata,
+                response_time_ms=response_time_ms,
+                success=success,
+                error_message=error_message
+            )
+        except Exception as e:
+            logger.warning(f"Failed to record API usage: {str(e)}")
+    
+    def translate_text(self, text: str, source_language: str, target_language: str,
+                      user_id: int = None, job_id: int = None, conversation_id: str = None) -> Dict[str, Any]:
+        """翻譯文字"""
+        
+        if not text.strip():
+            raise APIError("翻譯文字不能為空")
+        
+        # 構建標準翻譯 prompt（英文指令格式）
+        language_names = {
+            'zh-tw': 'Traditional Chinese',
+            'zh-cn': 'Simplified Chinese', 
+            'en': 'English',
+            'ja': 'Japanese',
+            'ko': 'Korean',
+            'vi': 'Vietnamese',
+            'th': 'Thai',
+            'id': 'Indonesian',
+            'ms': 'Malay',
+            'es': 'Spanish',
+            'fr': 'French',
+            'de': 'German',
+            'ru': 'Russian',
+            'ar': 'Arabic'
+        }
+        
+        source_lang_name = language_names.get(source_language, source_language)
+        target_lang_name = language_names.get(target_language, target_language)
+        
+        query = f"""Task: Translate ONLY into {target_lang_name} from {source_lang_name}.
+
+Rules:
+- Output translation text ONLY (no source text, no notes, no questions, no language-detection remarks).
+- Preserve original line breaks.
+- Do NOT wrap in quotes or code blocks.
+- Maintain original formatting and structure.
+
+{text.strip()}"""
+        
+        # 構建請求資料 - 使用成功版本的格式
+        request_data = {
+            'inputs': {},
+            'response_mode': 'blocking',
+            'user': f"user_{user_id}" if user_id else "doc-translator-user",
+            'query': query
+        }
+
+        # 如果有 conversation_id，加入請求中以維持對話連續性
+        if conversation_id:
+            request_data['conversation_id'] = conversation_id
+        
+        logger.info(f"[TRANSLATION] Sending translation request...")
+        logger.info(f"[TRANSLATION] Request data: {request_data}")
+        logger.info(f"[TRANSLATION] Text length: {len(text)} characters")
+
+        try:
+            response = self._make_request(
+                method='POST',
+                endpoint='/chat-messages',
+                data=request_data,
+                user_id=user_id,
+                job_id=job_id
+            )
+            
+            # 從響應中提取翻譯結果 - 使用成功版本的方式
+            answer = response.get('answer')
+            
+            if not isinstance(answer, str) or not answer.strip():
+                raise APIError("Dify API 返回空的翻譯結果")
+            
+            return {
+                'success': True,
+                'translated_text': answer,
+                'source_text': text,
+                'source_language': source_language,
+                'target_language': target_language,
+                'conversation_id': response.get('conversation_id'),
+                'metadata': response.get('metadata', {})
+            }
+        
+        except APIError:
+            raise
+        except Exception as e:
+            error_msg = f"翻譯請求處理錯誤: {str(e)}"
+            logger.error(error_msg)
+            raise APIError(error_msg)
+    
+    def test_connection(self) -> bool:
+        """測試 Dify API 連接"""
+        try:
+            # 發送簡單的測試請求
+            test_data = {
+                'inputs': {'text': 'test'},
+                'response_mode': 'blocking',
+                'user': 'health_check'
+            }
+            
+            response = self._make_request(
+                method='POST',
+                endpoint='/chat-messages',
+                data=test_data
+            )
+            
+            return response is not None
+        
+        except Exception as e:
+            logger.error(f"Dify API connection test failed: {str(e)}")
+            return False
+    
+    def get_app_info(self) -> Dict[str, Any]:
+        """取得 Dify 應用資訊"""
+        try:
+            response = self._make_request(
+                method='GET',
+                endpoint='/parameters'
+            )
+            
+            return {
+                'success': True,
+                'app_info': response
+            }
+        
+        except Exception as e:
+            logger.error(f"Failed to get Dify app info: {str(e)}")
+            return {
+                'success': False,
+                'error': str(e)
+            }
+    
+    @classmethod
+    def load_config_from_file(cls, file_path: str = 'api.txt'):
+        """從檔案載入 Dify API 配置"""
+        try:
+            import os
+            from pathlib import Path
+            
+            config_file = Path(file_path)
+            
+            if not config_file.exists():
+                logger.warning(f"Dify config file not found: {file_path}")
+                return
+            
+            with open(config_file, 'r', encoding='utf-8') as f:
+                for line in f:
+                    line = line.strip()
+                    if line.startswith('#') or not line:
+                        continue  # 跳过注释和空行
+
+                    # 翻译API配置（兼容旧格式）
+                    if line.startswith('base_url:') or line.startswith('translation_base_url:'):
+                        base_url = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_TRANSLATION_BASE_URL'] = base_url
+                        # 兼容旧配置
+                        current_app.config['DIFY_API_BASE_URL'] = base_url
+                    elif line.startswith('api:') or line.startswith('translation_api:'):
+                        api_key = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_TRANSLATION_API_KEY'] = api_key
+                        # 兼容旧配置
+                        current_app.config['DIFY_API_KEY'] = api_key
+
+                    # OCR API配置
+                    elif line.startswith('ocr_base_url:'):
+                        ocr_base_url = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_OCR_BASE_URL'] = ocr_base_url
+                    elif line.startswith('ocr_api:'):
+                        ocr_api_key = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_OCR_API_KEY'] = ocr_api_key
+            
+            logger.info("Dify API config loaded from file")
+        
+        except Exception as e:
+            logger.error(f"Failed to load Dify config from file: {str(e)}")
+
+    def upload_file(self, image_data: bytes, filename: str, user_id: int = None) -> str:
+        """上传图片文件到Dify OCR API并返回file_id"""
+
+        if not image_data:
+            raise APIError("图片数据不能为空")
+
+        logger.info(f"[OCR-UPLOAD] Starting file upload to Dify OCR API")
+        logger.info(f"[OCR-UPLOAD] File: {filename}, Size: {len(image_data)} bytes, User: {user_id}")
+
+        # 构建文件上传数据
+        files_data = {
+            'file': (filename, image_data, 'image/png')  # 假设为PNG格式
+        }
+
+        form_data = {
+            'user': f"user_{user_id}" if user_id else "doc-translator-user"
+        }
+
+        # logger.debug(f"[OCR-UPLOAD] Upload form_data: {form_data}")
+        # logger.debug(f"[OCR-UPLOAD] Using OCR API: {self.ocr_base_url}")
+
+        try:
+            response = self._make_request(
+                method='POST',
+                endpoint='/files/upload',
+                data=form_data,
+                files_data=files_data,
+                user_id=user_id,
+                api_type='ocr'  # 使用OCR API
+            )
+
+            logger.info(f"[OCR-UPLOAD] Raw Dify upload response: {response}")
+
+            file_id = response.get('id')
+            if not file_id:
+                logger.error(f"[OCR-UPLOAD] No file ID in response: {response}")
+                raise APIError("Dify 文件上传失败：未返回文件ID")
+
+            logger.info(f"[OCR-UPLOAD] ✓ File uploaded successfully: {file_id}")
+            # logger.debug(f"[OCR-UPLOAD] File details: name={response.get('name')}, size={response.get('size')}, type={response.get('mime_type')}")
+
+            return file_id
+
+        except APIError:
+            raise
+        except Exception as e:
+            error_msg = f"文件上传到Dify失败: {str(e)}"
+            logger.error(f"[OCR-UPLOAD] ✗ Upload failed: {error_msg}")
+            raise APIError(error_msg)
+
+    def ocr_image_with_dify(self, image_data: bytes, filename: str = "image.png",
+                           user_id: int = None, job_id: int = None) -> str:
+        """使用Dify进行图像OCR识别"""
+
+        logger.info(f"[OCR-RECOGNITION] Starting OCR process for {filename}")
+        logger.info(f"[OCR-RECOGNITION] Image size: {len(image_data)} bytes, User: {user_id}, Job: {job_id}")
+
+        try:
+            # 1. 先上传文件获取file_id
+            logger.info(f"[OCR-RECOGNITION] Step 1: Uploading image to Dify...")
+            file_id = self.upload_file(image_data, filename, user_id)
+            logger.info(f"[OCR-RECOGNITION] Step 1 ✓ File uploaded with ID: {file_id}")
+
+            # 2. 构建OCR请求
+            # 系统提示词已在Dify Chat Flow中配置，这里只需要发送简单的用户query
+            query = "將圖片中的文字完整的提取出來"
+            logger.info(f"[OCR-RECOGNITION] Step 2: Preparing OCR request...")
+            # logger.debug(f"[OCR-RECOGNITION] Query: {query}")
+
+            # 3. 构建Chat Flow请求，根据最新Dify运行记录，图片应该放在files数组中
+            request_data = {
+                'inputs': {},
+                'response_mode': 'blocking',
+                'user': f"user_{user_id}" if user_id else "doc-translator-user",
+                'query': query,
+                'files': [
+                    {
+                        'type': 'image',
+                        'transfer_method': 'local_file',
+                        'upload_file_id': file_id
+                    }
+                ]
+            }
+
+            logger.info(f"[OCR-RECOGNITION] Step 3: Sending OCR request to Dify...")
+            logger.info(f"[OCR-RECOGNITION] Request data: {request_data}")
+            logger.info(f"[OCR-RECOGNITION] Using OCR API: {self.ocr_base_url}")
+
+            response = self._make_request(
+                method='POST',
+                endpoint='/chat-messages',
+                data=request_data,
+                user_id=user_id,
+                job_id=job_id,
+                api_type='ocr'  # 使用OCR API
+            )
+
+            logger.info(f"[OCR-RECOGNITION] Step 3 ✓ Received response from Dify")
+            logger.info(f"[OCR-RECOGNITION] Raw Dify OCR response: {response}")
+
+            # 从响应中提取OCR结果
+            answer = response.get('answer', '')
+            metadata = response.get('metadata', {})
+            conversation_id = response.get('conversation_id', '')
+
+            logger.info(f"[OCR-RECOGNITION] Response details:")
+            logger.info(f"[OCR-RECOGNITION] - Answer length: {len(answer) if answer else 0} characters")
+            logger.info(f"[OCR-RECOGNITION] - Conversation ID: {conversation_id}")
+            logger.info(f"[OCR-RECOGNITION] - Metadata: {metadata}")
+
+            if not isinstance(answer, str) or not answer.strip():
+                logger.error(f"[OCR-RECOGNITION] ✗ Empty or invalid answer from Dify")
+                logger.error(f"[OCR-RECOGNITION] Answer type: {type(answer)}, Content: '{answer}'")
+                raise APIError("Dify OCR 返回空的识别结果")
+
+            # 记录OCR识别的前100个字符用于调试
+            preview = answer[:100] + "..." if len(answer) > 100 else answer
+            logger.info(f"[OCR-RECOGNITION] ✓ OCR completed successfully")
+            logger.info(f"[OCR-RECOGNITION] Extracted {len(answer)} characters")
+            # logger.debug(f"[OCR-RECOGNITION] Text preview: {preview}")
+
+            return answer.strip()
+
+        except APIError:
+            raise
+        except Exception as e:
+            error_msg = f"Dify OCR识别失败: {str(e)}"
+            logger.error(f"[OCR-RECOGNITION] ✗ OCR process failed: {error_msg}")
+            logger.error(f"[OCR-RECOGNITION] Exception details: {type(e).__name__}: {str(e)}")
+            raise APIError(error_msg)
+
+
+def init_dify_config(app):
+    """初始化 Dify 配置"""
+    with app.app_context():
+        # 從 api.txt 載入配置
+        DifyClient.load_config_from_file()
+        
+        # 檢查配置完整性
+        translation_base_url = app.config.get('DIFY_TRANSLATION_BASE_URL')
+        translation_api_key = app.config.get('DIFY_TRANSLATION_API_KEY')
+        ocr_base_url = app.config.get('DIFY_OCR_BASE_URL')
+        ocr_api_key = app.config.get('DIFY_OCR_API_KEY')
+
+        logger.info("Dify API Configuration Status:")
+        if translation_base_url and translation_api_key:
+            logger.info("✓ Translation API configured successfully")
+        else:
+            logger.warning("✗ Translation API configuration is incomplete")
+            logger.warning(f"  - Translation Base URL: {'✓' if translation_base_url else '✗'}")
+            logger.warning(f"  - Translation API Key: {'✓' if translation_api_key else '✗'}")
+
+        if ocr_base_url and ocr_api_key:
+            logger.info("✓ OCR API configured successfully")
+        else:
+            logger.warning("✗ OCR API configuration is incomplete (扫描PDF功能将不可用)")
+            logger.warning(f"  - OCR Base URL: {'✓' if ocr_base_url else '✗'}")
+            logger.warning(f"  - OCR API Key: {'✓' if ocr_api_key else '✗'}")

app/services/document_processor.py

@@ -0,0 +1,864 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+核心文檔處理邏輯 - 移植自最佳版本
+包含完整的 DOCX 文字提取和翻譯插入功能
+
+Author: PANJIT IT Team  
+Created: 2024-09-02
+Modified: 2024-09-02
+"""
+
+import re
+import sys
+import time
+from pathlib import Path
+from typing import List, Dict, Tuple, Optional, Any
+from docx.text.paragraph import Paragraph
+from docx.table import Table, _Cell
+from docx.shared import Pt
+from docx.oxml import OxmlElement
+from docx.oxml.ns import qn, nsdecls
+import docx
+
+from app.utils.logger import get_logger
+from app.utils.exceptions import FileProcessingError
+
+logger = get_logger(__name__)
+
+# ---------- Constants ----------
+INSERT_FONT_SIZE_PT = 10
+SENTENCE_MODE = True
+
+# ---------- Optional dependencies detection ----------
+try:
+    import blingfire
+    _HAS_BLINGFIRE = True
+except ImportError:
+    _HAS_BLINGFIRE = False
+
+try:
+    import pysbd
+    _HAS_PYSBD = True
+except ImportError:
+    _HAS_PYSBD = False
+
+# ---------- Helper functions ----------
+def _has_cjk(text: str) -> bool:
+    """Check if text contains CJK (Chinese/Japanese/Korean) characters."""
+    for char in text:
+        if '\u4e00' <= char <= '\u9fff' or \
+           '\u3400' <= char <= '\u4dbf' or \
+           '\u20000' <= char <= '\u2a6df' or \
+           '\u3040' <= char <= '\u309f' or \
+           '\u30a0' <= char <= '\u30ff' or \
+           '\uac00' <= char <= '\ud7af':
+            return True
+    return False
+
+def _normalize_text(text: str) -> str:
+    """Normalize text for comparison."""
+    return re.sub(r'\s+', ' ', text.strip().lower())
+
+def _append_after(p: Paragraph, text_block: str, italic: bool=True, font_size_pt: int=INSERT_FONT_SIZE_PT) -> Paragraph:
+    """Insert a new paragraph after p, return the new paragraph (for chain insert)."""
+    new_p = OxmlElement("w:p")
+    p._p.addnext(new_p)
+    np = Paragraph(new_p, p._parent)
+    lines = text_block.split("\n")
+    for i, line in enumerate(lines):
+        run = np.add_run(line)
+        if italic: 
+            run.italic = True
+        if font_size_pt: 
+            run.font.size = Pt(font_size_pt)
+        if i < len(lines) - 1:
+            run.add_break()
+    tag = np.add_run("\u200b")
+    if italic: 
+        tag.italic = True
+    if font_size_pt: 
+        tag.font.size = Pt(font_size_pt)
+    return np
+
+def _is_our_insert_block(p: Paragraph) -> bool:
+    """Return True iff paragraph contains our zero-width marker."""
+    return any("\u200b" in (r.text or "") for r in p.runs)
+
+def _find_last_inserted_after(p: Paragraph, limit: int = 8) -> Optional[Paragraph]:
+    """Find the last paragraph that was inserted after p (up to limit paragraphs)."""
+    try:
+        # Get all paragraphs in the parent container
+        if hasattr(p._parent, 'paragraphs'):
+            all_paras = list(p._parent.paragraphs)
+        else:
+            # Handle cases where _parent doesn't have paragraphs (e.g., table cells)
+            return None
+        
+        # Find p's index
+        p_index = -1
+        for i, para in enumerate(all_paras):
+            if para._element == p._element:
+                p_index = i
+                break
+        
+        if p_index == -1:
+            return None
+        
+        # Check paragraphs after p
+        last_found = None
+        for i in range(p_index + 1, min(p_index + 1 + limit, len(all_paras))):
+            if _is_our_insert_block(all_paras[i]):
+                last_found = all_paras[i]
+            else:
+                break  # Stop at first non-inserted paragraph
+    except Exception:
+        return None
+    
+    return last_found
+
+def _p_text_with_breaks(p: Paragraph) -> str:
+    """Extract text from paragraph with line breaks preserved."""
+    parts = []
+    for node in p._element.xpath(".//*[local-name()='t' or local-name()='br' or local-name()='tab']"):
+        tag = node.tag.split('}', 1)[-1]
+        if tag == "t":
+            parts.append(node.text or "")
+        elif tag == "br":
+            parts.append("\n")
+        elif tag == "tab":
+            parts.append("\t")
+    return "".join(parts)
+
+def _get_cell_full_text(cell) -> str:
+    """
+    提取表格儲存格的完整文字內容，包含所有段落
+    """
+    try:
+        cell_texts = []
+        for para in cell.paragraphs:
+            para_text = _p_text_with_breaks(para)
+            if para_text.strip():
+                cell_texts.append(para_text.strip())
+        
+        # 用換行符連接所有段落
+        return '\n'.join(cell_texts)
+    except Exception as e:
+        logger.warning(f"提取儲存格文字失敗: {e}")
+        return ""
+
+def _is_our_insert_block_text(text: str) -> bool:
+    """檢查文字是否為翻譯插入區塊"""
+    if not text:
+        return False
+    text_lower = text.lower().strip()
+    return (
+        text_lower.startswith('【') or
+        text_lower.startswith('[翻譯') or
+        '翻譯：' in text_lower or
+        'translation:' in text_lower or
+        text_lower.startswith('translated:') or
+        "\u200b" in text
+    )
+
+def _is_our_insert_block(p: Paragraph) -> bool:
+    """Check if paragraph is our inserted translation (contains zero-width space marker)."""
+    text = _p_text_with_breaks(p)
+    return "\u200b" in text
+
+def should_translate(text: str, src_lang: str) -> bool:
+    """Determine if text should be translated based on content and source language."""
+    text = text.strip()
+    
+    # 只要有字就翻譯 - 最小長度設為1
+    if len(text) < 1:
+        return False
+    
+    # Skip pure numbers, dates, etc.
+    if re.match(r'^[\d\s\.\-\:\/]+$', text):
+        return False
+    
+    # For auto-detect, translate if has CJK or meaningful text
+    if src_lang.lower() in ('auto', 'auto-detect'):
+        return _has_cjk(text) or len(text) > 5
+    
+    return True
+
+def _split_sentences(text: str, lang: str = 'auto') -> List[str]:
+    """Split text into sentences using available libraries."""
+    if not text.strip():
+        return []
+    
+    # Try blingfire first
+    if _HAS_BLINGFIRE and SENTENCE_MODE:
+        try:
+            sentences = blingfire.text_to_sentences(text).split('\n')
+            sentences = [s.strip() for s in sentences if s.strip()]
+            if sentences:
+                return sentences
+        except Exception as e:
+            logger.warning(f"Blingfire failed: {e}")
+    
+    # Try pysbd
+    if _HAS_PYSBD and SENTENCE_MODE:
+        try:
+            seg = pysbd.Segmenter(language="en" if lang == "auto" else lang)
+            sentences = seg.segment(text)
+            sentences = [s.strip() for s in sentences if s.strip()]
+            if sentences:
+                return sentences
+        except Exception as e:
+            logger.warning(f"PySBD failed: {e}")
+    
+    # Fallback to simple splitting
+    separators = ['. ', '。', '！', '？', '!', '?', '\n']
+    sentences = [text]
+    
+    for sep in separators:
+        new_sentences = []
+        for s in sentences:
+            parts = s.split(sep)
+            if len(parts) > 1:
+                new_sentences.extend([p.strip() + sep.rstrip() for p in parts[:-1] if p.strip()])
+                if parts[-1].strip():
+                    new_sentences.append(parts[-1].strip())
+            else:
+                new_sentences.append(s)
+        sentences = new_sentences
+    
+    return [s for s in sentences if len(s.strip()) > 3]
+
+# ---------- Segment class ----------
+class Segment:
+    """Represents a translatable text segment in a document."""
+    
+    def __init__(self, kind: str, ref: Any, ctx: str, text: str):
+        self.kind = kind   # 'para' | 'txbx'
+        self.ref = ref     # Reference to original document element
+        self.ctx = ctx     # Context information
+        self.text = text   # Text content
+
+# ---------- TextBox helpers ----------
+def _txbx_iter_texts(doc: docx.Document):
+    """
+    Yield (txbxContent_element, joined_source_text)
+    - Deeply collect all descendant <w:p> under txbxContent
+    - Skip our inserted translations: contains zero-width or (all italic and no CJK)
+    - Keep only lines that still have CJK
+    """
+    def _p_text_flags(p_el):
+        parts = []
+        for node in p_el.xpath(".//*[local-name()='t' or local-name()='br' or local-name()='tab']"):
+            tag = node.tag.split('}', 1)[-1]
+            if tag == "t":
+                parts.append(node.text or "")
+            elif tag == "br":
+                parts.append("\n")
+            else:
+                parts.append(" ")
+        text = "".join(parts)
+        has_zero = ("\u200b" in text)
+        runs = p_el.xpath(".//*[local-name()='r']")
+        vis, ital = [], []
+        for r in runs:
+            rt = "".join([(t.text or "") for t in r.xpath(".//*[local-name()='t']")])
+            if (rt or "").strip():
+                vis.append(rt)
+                ital.append(bool(r.xpath(".//*[local-name()='i']")))
+        all_italic = (len(vis) > 0 and all(ital))
+        return text, has_zero, all_italic
+
+    for tx in doc._element.xpath(".//*[local-name()='txbxContent']"):
+        kept = []
+        for p in tx.xpath(".//*[local-name()='p']"):   # all descendant paragraphs
+            text, has_zero, all_italic = _p_text_flags(p)
+            if not (text or "").strip():
+                continue
+            if has_zero:
+                continue  # our inserted
+            for line in text.split("\n"):
+                if line.strip():
+                    kept.append(line.strip())
+        if kept:
+            joined = "\n".join(kept)
+            yield tx, joined
+
+def _txbx_append_paragraph(tx, text_block: str, italic: bool = True, font_size_pt: int = INSERT_FONT_SIZE_PT):
+    """Append a paragraph to textbox content."""
+    p = OxmlElement("w:p")
+    r = OxmlElement("w:r")
+    rPr = OxmlElement("w:rPr")
+    if italic:
+        rPr.append(OxmlElement("w:i"))
+    if font_size_pt:
+        sz = OxmlElement("w:sz")
+        sz.set(qn("w:val"), str(int(font_size_pt * 2)))
+        rPr.append(sz)
+    r.append(rPr)
+    lines = text_block.split("\n")
+    for i, line in enumerate(lines):
+        if i > 0:
+            r.append(OxmlElement("w:br"))
+        t = OxmlElement("w:t")
+        t.set(qn("xml:space"), "preserve")
+        t.text = line
+        r.append(t)
+    tag = OxmlElement("w:t")
+    tag.set(qn("xml:space"), "preserve")
+    tag.text = "\u200b"
+    r.append(tag)
+    p.append(r)
+    tx.append(p)
+
+def _txbx_tail_equals(tx, translations: List[str]) -> bool:
+    """Check if textbox already contains the expected translations."""
+    paras = tx.xpath("./*[local-name()='p']")
+    if len(paras) < len(translations):
+        return False
+    tail = paras[-len(translations):]
+    for q, expect in zip(tail, translations):
+        parts = []
+        for node in q.xpath(".//*[local-name()='t' or local-name()='br']"):
+            tag = node.tag.split("}", 1)[-1]
+            parts.append("\n" if tag == "br" else (node.text or ""))
+        if _normalize_text("".join(parts).strip()) != _normalize_text(expect):
+            return False
+    return True
+
+# ---------- Main extraction logic ----------
+def _get_paragraph_key(p: Paragraph) -> str:
+    """Generate a stable unique key for paragraph deduplication."""
+    try:
+        # Use XML content hash + text content for stable deduplication
+        xml_content = p._p.xml if hasattr(p._p, 'xml') else str(p._p)
+        text_content = _p_text_with_breaks(p)
+        combined = f"{hash(xml_content)}_{len(text_content)}_{text_content[:50]}"
+        return combined
+    except Exception:
+        # Fallback to simple text-based key
+        text_content = _p_text_with_breaks(p)
+        return f"fallback_{hash(text_content)}_{len(text_content)}"
+
+def _collect_docx_segments(doc: docx.Document) -> List[Segment]:
+    """
+    Enhanced segment collector with improved stability.
+    Handles paragraphs, tables, textboxes, and SDT Content Controls.
+    """
+    segs: List[Segment] = []
+    seen_par_keys = set()
+
+    def _add_paragraph(p: Paragraph, ctx: str):
+        try:
+            p_key = _get_paragraph_key(p)
+            if p_key in seen_par_keys:
+                return
+            
+            txt = _p_text_with_breaks(p)
+            if txt.strip() and not _is_our_insert_block(p):
+                segs.append(Segment("para", p, ctx, txt))
+                seen_par_keys.add(p_key)
+        except Exception as e:
+            # Log error but continue processing
+            logger.warning(f"段落處理錯誤: {e}, 跳過此段落")
+
+    def _process_container_content(container, ctx: str):
+        """
+        Recursively processes content within a container (body, cell, or SDT content).
+        Identifies and handles paragraphs, tables, and SDT elements.
+        """
+        if container._element is None:
+            return
+
+        for child_element in container._element:
+            qname = child_element.tag
+            
+            if qname.endswith('}p'):  # Paragraph
+                p = Paragraph(child_element, container)
+                _add_paragraph(p, ctx)
+
+            elif qname.endswith('}tbl'):  # Table
+                table = Table(child_element, container)
+                for r_idx, row in enumerate(table.rows, 1):
+                    for c_idx, cell in enumerate(row.cells, 1):
+                        cell_ctx = f"{ctx} > Tbl(r{r_idx},c{c_idx})"
+                        
+                        # 使用儲存格為單位的提取方式（而非逐段落提取）
+                        cell_text = _get_cell_full_text(cell)
+                        if cell_text.strip() and not _is_our_insert_block_text(cell_text):
+                            segs.append(Segment("table_cell", cell, cell_ctx, cell_text))
+
+            elif qname.endswith('}sdt'):  # Structured Document Tag (SDT)
+                sdt_ctx = f"{ctx} > SDT"
+                
+                # 1. 提取 SDT 的元數據文本 (Placeholder, Dropdown items)
+                ns = {'w': 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'}
+                
+                # 提取 Placeholder text
+                placeholder_texts = []
+                for t in child_element.xpath('.//w:placeholder//w:t', namespaces=ns):
+                    if t.text:
+                        placeholder_texts.append(t.text)
+                if placeholder_texts:
+                    full_placeholder = "".join(placeholder_texts).strip()
+                    if full_placeholder:
+                        segs.append(Segment("para", child_element, f"{sdt_ctx}-Placeholder", full_placeholder))
+                
+                # 提取 Dropdown list items
+                list_items = []
+                for item in child_element.xpath('.//w:dropDownList/w:listItem', namespaces=ns):
+                    display_text = item.get(qn('w:displayText'))
+                    if display_text:
+                        list_items.append(display_text)
+                if list_items:
+                    items_as_text = "\n".join(list_items)
+                    segs.append(Segment("para", child_element, f"{sdt_ctx}-Dropdown", items_as_text))
+
+                # 2. 遞迴處理 SDT 的實際內容 (sdtContent)
+                sdt_content_element = child_element.find(qn('w:sdtContent'))
+                if sdt_content_element is not None:
+                    class SdtContentWrapper:
+                        def __init__(self, element, parent):
+                            self._element = element
+                            self._parent = parent
+                    
+                    sdt_content_wrapper = SdtContentWrapper(sdt_content_element, container)
+                    _process_container_content(sdt_content_wrapper, sdt_ctx)
+
+    # --- Main execution starts here ---
+
+    # 1. Process the main document body
+    _process_container_content(doc._body, "Body")
+
+    # 2. Process textboxes
+    for tx, s in _txbx_iter_texts(doc):
+        if s.strip() and (_has_cjk(s) or should_translate(s, 'auto')):
+            segs.append(Segment("txbx", tx, "TextBox", s))
+
+    return segs
+
+def _insert_docx_translations(doc: docx.Document, segs: List[Segment],
+                              tmap: Dict[Tuple[str, str], str],
+                              targets: List[str], log=lambda s: None) -> Tuple[int, int]:
+    """
+    Insert translations into DOCX document segments.
+    
+    CRITICAL: This function contains the fix for the major translation insertion bug.
+    The key fix is in the segment filtering logic - we now correctly check if any target
+    language has translation available using the proper key format (target_lang, text).
+    
+    Args:
+        doc: The DOCX document object
+        segs: List of segments to translate 
+        tmap: Translation map with keys as (target_language, source_text)
+        targets: List of target languages in order
+        log: Logging function
+        
+    Returns:
+        Tuple of (successful_insertions, skipped_insertions)
+        
+    Key Bug Fix:
+        OLD (INCORRECT): if (seg.kind, seg.text) not in tmap and (targets[0], seg.text) not in tmap
+        NEW (CORRECT): has_any_translation = any((tgt, seg.text) in tmap for tgt in targets)
+    """
+    ok_cnt = skip_cnt = 0
+    
+    # Helper function to add a formatted run to a paragraph
+    def _add_formatted_run(p: Paragraph, text: str, italic: bool, font_size_pt: int):
+        lines = text.split("\n")
+        for i, line in enumerate(lines):
+            run = p.add_run(line)
+            if italic:
+                run.italic = True
+            if font_size_pt:
+                run.font.size = Pt(font_size_pt)
+            if i < len(lines) - 1:
+                run.add_break()
+        # Add our zero-width space marker
+        tag_run = p.add_run("\u200b")
+        if italic:
+            tag_run.italic = True
+        if font_size_pt:
+            tag_run.font.size = Pt(font_size_pt)
+
+    for seg in segs:
+        # Check if any target language has translation for this segment
+        has_any_translation = any((tgt, seg.text) in tmap for tgt in targets)
+        if not has_any_translation:
+            log(f"[SKIP] 無翻譯結果: {seg.ctx} | {seg.text[:50]}...")
+            skip_cnt += 1
+            continue
+        
+        # Get translations for all targets, with fallback for missing ones
+        translations = []
+        for tgt in targets:
+            if (tgt, seg.text) in tmap:
+                translations.append(tmap[(tgt, seg.text)])
+            else:
+                log(f"[WARNING] 缺少 {tgt} 翻譯: {seg.text[:30]}...")
+                translations.append(f"【翻譯查詢失敗｜{tgt}】{seg.text[:50]}...")
+        
+        log(f"[INSERT] 準備插入 {len(translations)} 個翻譯到 {seg.ctx}: {seg.text[:30]}...")
+
+        if seg.kind == "para":
+            # Check if this is an SDT segment (ref is an XML element, not a Paragraph)
+            if hasattr(seg.ref, 'tag') and seg.ref.tag.endswith('}sdt'):
+                # Handle SDT segments - insert translation into sdtContent
+                sdt_element = seg.ref
+                ns = {'w': 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'}
+                sdt_content = sdt_element.find(qn('w:sdtContent'))
+                
+                if sdt_content is not None:
+                    # Check if translations already exist
+                    existing_paras = sdt_content.xpath('.//w:p', namespaces=ns)
+                    existing_texts = []
+                    for ep in existing_paras:
+                        p_obj = Paragraph(ep, None)
+                        if _is_our_insert_block(p_obj):
+                            existing_texts.append(_p_text_with_breaks(p_obj))
+                    
+                    # Check if all translations already exist
+                    if len(existing_texts) >= len(translations):
+                        if all(_normalize_text(e) == _normalize_text(t) for e, t in zip(existing_texts[:len(translations)], translations)):
+                            skip_cnt += 1
+                            log(f"[SKIP] SDT 已存在翻譯: {seg.text[:30]}...")
+                            continue
+                    
+                    # Add translations to SDT content
+                    for t in translations:
+                        if not any(_normalize_text(t) == _normalize_text(e) for e in existing_texts):
+                            # Create new paragraph in SDT content
+                            new_p_element = OxmlElement("w:p")
+                            sdt_content.append(new_p_element)
+                            new_p = Paragraph(new_p_element, None)
+                            _add_formatted_run(new_p, t, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                    
+                    ok_cnt += 1
+                    log(f"[SUCCESS] SDT 插入翻譯（交錯格式）")
+                    continue
+            
+            p: Paragraph = seg.ref
+            
+            # --- CONTEXT-AWARE INSERTION LOGIC (from successful version) ---
+            # Check if the paragraph's parent is a table cell
+            if isinstance(p._parent, _Cell):
+                cell = p._parent
+                
+                try:
+                    # Find the current paragraph's position in the cell
+                    cell_paragraphs = list(cell.paragraphs)
+                    p_index = -1
+                    for idx, cell_p in enumerate(cell_paragraphs):
+                        if cell_p._element == p._element:
+                            p_index = idx
+                            break
+                    
+                    if p_index == -1:
+                        log(f"[WARNING] 無法找到段落在單元格中的位置，使用原始方法")
+                        # Fallback to original method
+                        for block in translations:
+                            new_p = cell.add_paragraph()
+                            _add_formatted_run(new_p, block, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                        ok_cnt += 1
+                        continue
+                    
+                    # Check if translations already exist right after this paragraph
+                    existing_texts = []
+                    check_limit = min(p_index + 1 + len(translations), len(cell_paragraphs))
+                    for idx in range(p_index + 1, check_limit):
+                        if _is_our_insert_block(cell_paragraphs[idx]):
+                            existing_texts.append(_p_text_with_breaks(cell_paragraphs[idx]))
+                    
+                    # Check if all translations already exist in order
+                    if len(existing_texts) >= len(translations):
+                        if all(_normalize_text(e) == _normalize_text(t) for e, t in zip(existing_texts[:len(translations)], translations)):
+                            skip_cnt += 1
+                            log(f"[SKIP] 表格單元格已存在翻譯: {seg.text[:30]}...")
+                            continue
+                    
+                    # Determine which translations need to be added
+                    to_add = []
+                    for t in translations:
+                        if not any(_normalize_text(t) == _normalize_text(e) for e in existing_texts):
+                            to_add.append(t)
+                    
+                    if not to_add:
+                        skip_cnt += 1
+                        log(f"[SKIP] 表格單元格所有翻譯已存在: {seg.text[:30]}...")
+                        continue
+                    
+                    # Insert new paragraphs right after the current paragraph
+                    insert_after = p
+                    for block in to_add:
+                        try:
+                            # Create new paragraph and insert it after the current position
+                            new_p_element = OxmlElement("w:p")
+                            insert_after._element.addnext(new_p_element)
+                            new_p = Paragraph(new_p_element, cell)
+                            _add_formatted_run(new_p, block, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                            insert_after = new_p  # Update position for next insertion
+                        except Exception as e:
+                            log(f"[ERROR] 表格插入失敗: {e}, 嘗試fallback方法")
+                            # Fallback: add at the end of cell
+                            try:
+                                new_p = cell.add_paragraph()
+                                _add_formatted_run(new_p, block, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                                log(f"[SUCCESS] Fallback插入成功")
+                            except Exception as e2:
+                                log(f"[FATAL] Fallback也失敗: {e2}")
+                                continue
+                    ok_cnt += 1
+                    log(f"[SUCCESS] 表格單元格插入 {len(to_add)} 個翻譯（緊接原文後）")
+                    
+                except Exception as e:
+                    log(f"[ERROR] 表格處理全面失敗: {e}, 跳過此段落")
+                    continue
+            
+            else:
+                # Normal paragraph (not in table cell) - SIMPLIFIED FOR DEBUGGING
+                try:
+                    # TEMPORARILY DISABLE existing translation check to force insertion
+                    log(f"[DEBUG] 強制插入翻譯到段落: {seg.text[:30]}...")
+                    
+                    # Force all translations to be added
+                    to_add = translations
+                    
+                    # Use simple positioning - always insert after current paragraph
+                    anchor = p
+                    
+                    for block in to_add:
+                        try:
+                            log(f"[DEBUG] 嘗試插入: {block[:50]}...")
+                            anchor = _append_after(anchor, block, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                            log(f"[SUCCESS] _append_after成功插入")
+                        except Exception as e:
+                            log(f"[ERROR] _append_after失敗: {e}, 嘗試簡化插入")
+                            try:
+                                # Fallback: simple append 
+                                if hasattr(p._parent, 'add_paragraph'):
+                                    new_p = p._parent.add_paragraph()
+                                    _add_formatted_run(new_p, block, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+                                    log(f"[SUCCESS] Fallback段落插入成功")
+                                else:
+                                    log(f"[ERROR] 無法進行fallback插入")
+                            except Exception as e2:
+                                log(f"[FATAL] Fallback也失敗: {e2}")
+                                continue
+                    
+                    ok_cnt += 1
+                    log(f"[SUCCESS] 段落強制插入 {len(to_add)} 個翻譯")
+                    
+                except Exception as e:
+                    log(f"[ERROR] 段落處理失敗: {e}, 跳過此段落")
+                    continue
+
+        elif seg.kind == "table_cell":
+            # 處理表格儲存格翻譯插入
+            cell = seg.ref  # cell 是 _Cell 對象
+            
+            # 檢查儲存格是否已有翻譯
+            existing_translations = []
+            cell_paragraphs = list(cell.paragraphs)
+            
+            # 檢查儲存格末尾是否已有翻譯
+            translation_start_index = len(cell_paragraphs)
+            for i in range(len(cell_paragraphs) - 1, -1, -1):
+                if _is_our_insert_block(cell_paragraphs[i]):
+                    existing_translations.insert(0, _p_text_with_breaks(cell_paragraphs[i]))
+                    translation_start_index = i
+                else:
+                    break
+            
+            # 檢查是否所有翻譯都已存在且相同
+            if len(existing_translations) >= len(translations):
+                if all(_normalize_text(e) == _normalize_text(t) for e, t in zip(existing_translations[:len(translations)], translations)):
+                    skip_cnt += 1
+                    log(f"[SKIP] 表格儲存格已存在翻譯: {seg.text[:30]}...")
+                    continue
+            
+            # 移除舊的翻譯段落（如果有的話）
+            for i in range(len(cell_paragraphs) - 1, translation_start_index - 1, -1):
+                if _is_our_insert_block(cell_paragraphs[i]):
+                    cell._element.remove(cell_paragraphs[i]._element)
+            
+            # 檢查是否為簡單的短文本儲存格（只有原文，沒有複雜結構）
+            cell_content = cell.text.strip()
+            is_simple_cell = len(cell_content) <= 10 and cell_content == seg.text.strip()
+            
+            if is_simple_cell:
+                # 對於簡單短文本，直接替換內容而不是添加段落
+                log(f"[INFO] 簡單儲存格內容替換: '{seg.text.strip()}' -> '{translations[0] if translations else 'N/A'}'")
+                
+                # 清空所有段落內容
+                for para in cell.paragraphs:
+                    para.clear()
+                
+                # 在第一個段落中添加原文和翻譯
+                first_para = cell.paragraphs[0] if cell.paragraphs else cell.add_paragraph()
+                
+                # 添加原文
+                run_orig = first_para.add_run(seg.text.strip())
+                
+                # 添加換行和翻譯
+                for t in translations:
+                    first_para.add_run('\n')
+                    run_trans = first_para.add_run(t)
+                    run_trans.italic = True
+                    if INSERT_FONT_SIZE_PT:
+                        run_trans.font.size = Pt(INSERT_FONT_SIZE_PT)
+                
+                # 添加標記
+                tag_run = first_para.add_run("\u200b")
+                tag_run.italic = True
+                if INSERT_FONT_SIZE_PT:
+                    tag_run.font.size = Pt(INSERT_FONT_SIZE_PT)
+            else:
+                # 對於複雜儲存格，使用原有的添加段落方式
+                for t in translations:
+                    new_p = cell.add_paragraph()
+                    _add_formatted_run(new_p, t, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+            
+            ok_cnt += 1
+            log(f"[SUCCESS] 表格儲存格插入 {len(translations)} 個翻譯")
+
+        elif seg.kind == "txbx":
+            tx = seg.ref
+            # Check if textbox already has our translations at the end
+            if _txbx_tail_equals(tx, translations):
+                skip_cnt += 1
+                log(f"[SKIP] 文字框已存在翻譯: {seg.text[:30]}...")
+                continue
+            
+            # Append translations to textbox
+            for t in translations:
+                _txbx_append_paragraph(tx, t, italic=True, font_size_pt=INSERT_FONT_SIZE_PT)
+            
+            ok_cnt += 1
+            log(f"[SUCCESS] 文字框插入 {len(translations)} 個翻譯")
+    
+    return ok_cnt, skip_cnt
+
+# ---------- Main DocumentProcessor class ----------
+class DocumentProcessor:
+    """Enhanced document processor with complete DOCX handling capabilities."""
+    
+    def __init__(self):
+        self.logger = logger
+    
+    def extract_docx_segments(self, file_path: str) -> List[Segment]:
+        """Extract all translatable segments from DOCX file."""
+        try:
+            doc = docx.Document(file_path)
+            segments = _collect_docx_segments(doc)
+            
+            self.logger.info(f"Extracted {len(segments)} segments from {file_path}")
+            for seg in segments[:5]:  # Log first 5 segments for debugging
+                self.logger.debug(f"Segment: {seg.kind} | {seg.ctx} | {seg.text[:50]}...")
+            
+            return segments
+        
+        except Exception as e:
+            self.logger.error(f"Failed to extract DOCX segments from {file_path}: {str(e)}")
+            raise FileProcessingError(f"DOCX 文件分析失敗: {str(e)}")
+    
+    def _rematch_segments_to_document(self, doc: docx.Document, old_segments: List[Segment]) -> List[Segment]:
+        """Re-match segments from old document instance to new document instance."""
+        try:
+            # Extract fresh segments from the current document instance
+            fresh_segments = _collect_docx_segments(doc)
+            
+            # Match old segments with fresh segments based on text content
+            matched_segments = []
+            
+            for old_seg in old_segments:
+                # Find matching segment in fresh segments
+                matched = False
+                for fresh_seg in fresh_segments:
+                    if (old_seg.kind == fresh_seg.kind and 
+                        old_seg.ctx == fresh_seg.ctx and
+                        _normalize_text(old_seg.text) == _normalize_text(fresh_seg.text)):
+                        matched_segments.append(fresh_seg)
+                        matched = True
+                        break
+                
+                if not matched:
+                    self.logger.warning(f"Failed to match segment: {old_seg.text[:50]}...")
+                    # Still add the old segment but it might not work for insertion
+                    matched_segments.append(old_seg)
+            
+            self.logger.debug(f"Re-matched {len(matched_segments)} segments to current document")
+            return matched_segments
+            
+        except Exception as e:
+            self.logger.error(f"Failed to re-match segments: {str(e)}")
+            # Return original segments as fallback
+            return old_segments
+    
+    def insert_docx_translations(self, file_path: str, segments: List[Segment], 
+                                 translation_map: Dict[Tuple[str, str], str],
+                                 target_languages: List[str], output_path: str) -> Tuple[int, int]:
+        """Insert translations into DOCX file and save to output path."""
+        try:
+            doc = docx.Document(file_path)
+            
+            # CRITICAL FIX: Re-match segments with the current document instance
+            # The original segments were extracted from a different document instance
+            matched_segments = self._rematch_segments_to_document(doc, segments)
+            
+            def log_func(msg: str):
+                self.logger.debug(msg)
+            
+            ok_count, skip_count = _insert_docx_translations(
+                doc, matched_segments, translation_map, target_languages, log_func
+            )
+            
+            # Save the modified document
+            doc.save(output_path)
+            
+            self.logger.info(f"Inserted {ok_count} translations, skipped {skip_count}. Saved to: {output_path}")
+            return ok_count, skip_count
+        
+        except Exception as e:
+            self.logger.error(f"Failed to insert DOCX translations: {str(e)}")
+            raise FileProcessingError(f"DOCX 翻譯插入失敗: {str(e)}")
+    
+    def split_text_into_sentences(self, text: str, language: str = 'auto') -> List[str]:
+        """Split text into sentences using the best available method."""
+        return _split_sentences(text, language)
+    
+    def should_translate_text(self, text: str, source_language: str) -> bool:
+        """Determine if text should be translated."""
+        return should_translate(text, source_language)
+    
+    def insert_docx_combined_translations(self, file_path: str, segments: List[Segment], 
+                                         translation_map: Dict[Tuple[str, str], str],
+                                         target_languages: List[str], output_path: str) -> Tuple[int, int]:
+        """Insert all translations into a single DOCX file with combined multi-language output.
+        
+        This creates a combined file where each original text is followed by all translations
+        in the format: original\n英文\n越南文 etc.
+        """
+        try:
+            doc = docx.Document(file_path)
+            
+            # Re-match segments with the current document instance  
+            matched_segments = self._rematch_segments_to_document(doc, segments)
+            
+            def log_func(msg: str):
+                self.logger.debug(msg)
+            
+            # Use the existing _insert_docx_translations function which already supports
+            # multiple target languages in a single document
+            ok_count, skip_count = _insert_docx_translations(
+                doc, matched_segments, translation_map, target_languages, log_func
+            )
+            
+            # Save the combined document
+            doc.save(output_path)
+            
+            self.logger.info(f"Generated combined multi-language file: {output_path}")
+            self.logger.info(f"Inserted {ok_count} translations, skipped {skip_count}")
+            return ok_count, skip_count
+        
+        except Exception as e:
+            self.logger.error(f"Failed to create combined DOCX translations: {str(e)}")
+            raise FileProcessingError(f"組合多語言 DOCX 檔案生成失敗: {str(e)}")

app/services/enhanced_pdf_parser.py

@@ -0,0 +1,700 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+增强的PDF解析器 - 支持扫描PDF的OCR处理
+
+Author: PANJIT IT Team
+Created: 2024-09-23
+Modified: 2024-09-23
+"""
+
+import io
+from pathlib import Path
+from typing import List, Optional
+from PyPDF2 import PdfReader
+from app.utils.logger import get_logger
+from app.utils.exceptions import FileProcessingError
+from app.services.dify_client import DifyClient
+from app.services.ocr_cache import OCRCache
+from app.utils.image_preprocessor import ImagePreprocessor
+
+logger = get_logger(__name__)
+
+# 检查PyMuPDF依赖
+try:
+    import fitz  # PyMuPDF
+    _HAS_PYMUPDF = True
+except ImportError:
+    _HAS_PYMUPDF = False
+    logger.warning("PyMuPDF not available. Scanned PDF processing will be disabled.")
+
+
+class EnhancedPdfParser:
+    """支持扫描PDF的增强解析器"""
+
+    def __init__(self, file_path: str):
+        self.file_path = Path(file_path)
+        self.dify_client = DifyClient()
+        self.ocr_cache = OCRCache()
+        self.image_preprocessor = ImagePreprocessor(use_opencv=True)
+
+        if not self.file_path.exists():
+            raise FileProcessingError(f"PDF文件不存在: {file_path}")
+
+    def is_scanned_pdf(self) -> bool:
+        """检测PDF是否为扫描件"""
+        try:
+            reader = PdfReader(str(self.file_path))
+            text_content = ""
+
+            # 检查前3页的文字内容
+            pages_to_check = min(3, len(reader.pages))
+            for i in range(pages_to_check):
+                page_text = reader.pages[i].extract_text()
+                text_content += page_text
+
+            # 如果文字内容很少，很可能是扫描件
+            text_length = len(text_content.strip())
+            logger.info(f"PDF text extraction found {text_length} characters in first {pages_to_check} pages")
+
+            # 阈值：少于100个字符认为是扫描件
+            is_scanned = text_length < 100
+
+            if is_scanned:
+                logger.info("PDF detected as scanned document, will use OCR processing")
+            else:
+                logger.info("PDF detected as text-based document, will use direct text extraction")
+
+            return is_scanned
+
+        except Exception as e:
+            logger.warning(f"Failed to analyze PDF type: {e}, treating as scanned document")
+            return True  # 默认当作扫描件处理
+
+    def extract_text_segments(self, user_id: int = None, job_id: int = None) -> List[str]:
+        """智能提取PDF文字片段"""
+        try:
+            # 首先尝试直接文字提取
+            if not self.is_scanned_pdf():
+                return self._extract_from_text_pdf()
+
+            # 扫描PDF则转换为图片后使用Dify OCR
+            if not _HAS_PYMUPDF:
+                raise FileProcessingError("处理扫描PDF需要PyMuPDF库，请安装: pip install PyMuPDF")
+
+            return self._extract_from_scanned_pdf(user_id, job_id)
+
+        except Exception as e:
+            logger.error(f"PDF文字提取失败: {str(e)}")
+            raise FileProcessingError(f"PDF文件解析失败: {str(e)}")
+
+    def _extract_from_text_pdf(self) -> List[str]:
+        """从文字型PDF提取文字片段"""
+        try:
+            reader = PdfReader(str(self.file_path))
+            text_segments = []
+
+            for page_num, page in enumerate(reader.pages, 1):
+                page_text = page.extract_text()
+
+                if page_text.strip():
+                    # 简单的句子分割
+                    sentences = self._split_text_into_sentences(page_text)
+
+                    # 过滤掉太短的片段
+                    valid_sentences = [s for s in sentences if len(s.strip()) > 10]
+                    text_segments.extend(valid_sentences)
+
+                    logger.debug(f"Page {page_num}: extracted {len(valid_sentences)} sentences")
+
+            logger.info(f"Text PDF extraction completed: {len(text_segments)} segments")
+
+            # 合併短段落以減少不必要的翻譯調用
+            merged_segments = self._merge_short_segments(text_segments)
+            return merged_segments
+
+        except Exception as e:
+            logger.error(f"Text PDF extraction failed: {str(e)}")
+            raise FileProcessingError(f"文字PDF提取失败: {str(e)}")
+
+    def _extract_from_scanned_pdf(self, user_id: int = None, job_id: int = None) -> List[str]:
+        """从扫描PDF提取文字片段（使用Dify OCR）"""
+        try:
+            doc = fitz.open(str(self.file_path))
+            text_segments = []
+            total_pages = doc.page_count
+
+            logger.info(f"Processing scanned PDF with {total_pages} pages using Dify OCR")
+
+            for page_num in range(total_pages):
+                try:
+                    logger.info(f"[PDF-OCR] Processing page {page_num + 1}/{total_pages}")
+                    page = doc[page_num]
+
+                    # 转换页面为高分辨率图片
+                    # 使用2倍缩放提高OCR准确度
+                    zoom = 2.0
+                    mat = fitz.Matrix(zoom, zoom)
+                    pix = page.get_pixmap(matrix=mat, alpha=False)
+
+                    # 转换为PNG字节数据
+                    # 轉換為 PNG 並進行圖像預處理以提升 OCR 準確度
+                    img_data_raw = pix.tobytes("png")
+                    img_data = self.image_preprocessor.preprocess_smart(img_data_raw)
+                    logger.debug(f"[PDF-OCR] Page {page_num + 1}: Image preprocessed ({len(img_data_raw)} -> {len(img_data)} bytes)")
+                    filename = f"page_{page_num + 1}.png"
+
+                    logger.info(f"[PDF-OCR] Page {page_num + 1}: Converted to image ({len(img_data)} bytes)")
+                    logger.debug(f"[PDF-OCR] Page {page_num + 1}: Image zoom={zoom}, format=PNG")
+
+                    # 检查OCR快取
+                    cache_key_info = f"{self.file_path.name}_page_{page_num + 1}_zoom_{zoom}"
+                    cached_text = self.ocr_cache.get_cached_text(
+                        file_data=img_data,
+                        filename=filename,
+                        additional_info=cache_key_info
+                    )
+
+                    if cached_text:
+                        logger.info(f"[PDF-OCR] Page {page_num + 1}: ✓ 使用快取的OCR結果 (節省AI流量)")
+                        ocr_text = cached_text
+                    else:
+                        # 使用Dify OCR识别文字
+                        logger.info(f"[PDF-OCR] Page {page_num + 1}: Starting OCR recognition...")
+                        ocr_text = self.dify_client.ocr_image_with_dify(
+                            image_data=img_data,
+                            filename=filename,
+                            user_id=user_id,
+                            job_id=job_id
+                        )
+
+                        # 保存OCR结果到快取
+                        if ocr_text.strip():
+                            self.ocr_cache.save_cached_text(
+                                file_data=img_data,
+                                extracted_text=ocr_text,
+                                filename=filename,
+                                additional_info=cache_key_info,
+                                metadata={
+                                    'source_file': str(self.file_path),
+                                    'page_number': page_num + 1,
+                                    'total_pages': total_pages,
+                                    'zoom_level': zoom,
+                                    'image_size_bytes': len(img_data),
+                                    'user_id': user_id,
+                                    'job_id': job_id
+                                }
+                            )
+                            logger.info(f"[PDF-OCR] Page {page_num + 1}: ✓ OCR結果已保存到快取")
+
+                    logger.info(f"[PDF-OCR] Page {page_num + 1}: OCR completed")
+                    logger.debug(f"[PDF-OCR] Page {page_num + 1}: Raw OCR result length: {len(ocr_text)}")
+
+                    if ocr_text.strip():
+                        # 分割OCR结果为句子
+                        logger.debug(f"[PDF-OCR] Page {page_num + 1}: Splitting OCR text into sentences...")
+                        sentences = self._split_ocr_text(ocr_text)
+
+                        # 过滤有效句子
+                        valid_sentences = [s for s in sentences if len(s.strip()) > 5]
+                        text_segments.extend(valid_sentences)
+
+                        logger.info(f"[PDF-OCR] Page {page_num + 1}: ✓ Extracted {len(valid_sentences)} valid sentences")
+                        logger.debug(f"[PDF-OCR] Page {page_num + 1}: Total sentences before filter: {len(sentences)}")
+
+                        # 记录前50个字符用于调试
+                        if valid_sentences:
+                            preview = valid_sentences[0][:50] + "..." if len(valid_sentences[0]) > 50 else valid_sentences[0]
+                            logger.debug(f"[PDF-OCR] Page {page_num + 1}: First sentence preview: {preview}")
+                    else:
+                        logger.warning(f"[PDF-OCR] Page {page_num + 1}: ⚠ OCR returned empty result")
+
+                except Exception as e:
+                    logger.error(f"[PDF-OCR] Page {page_num + 1}: ✗ Processing failed: {str(e)}")
+                    logger.error(f"[PDF-OCR] Page {page_num + 1}: Exception type: {type(e).__name__}")
+                    # 继续处理下一页，不中断整个流程
+                    continue
+
+            doc.close()
+
+            logger.info(f"[PDF-OCR] OCR processing completed for all {total_pages} pages")
+            logger.info(f"[PDF-OCR] Total text segments extracted: {len(text_segments)}")
+
+            if not text_segments:
+                logger.error(f"[PDF-OCR] ✗ No text content extracted from any page")
+                raise FileProcessingError("OCR处理完成，但未提取到任何文字内容")
+
+            logger.info(f"[PDF-OCR] ✓ Scanned PDF processing completed successfully")
+            logger.info(f"[PDF-OCR] Final result: {len(text_segments)} text segments extracted")
+
+            # 合併短段落以減少不必要的翻譯調用
+            merged_segments = self._merge_short_segments(text_segments)
+            logger.info(f"[PDF-OCR] After merging: {len(merged_segments)} segments ready for translation")
+            return merged_segments
+
+        except Exception as e:
+            logger.error(f"Scanned PDF processing failed: {str(e)}")
+            raise FileProcessingError(f"扫描PDF处理失败: {str(e)}")
+
+    def _split_text_into_sentences(self, text: str) -> List[str]:
+        """将文字分割成句子"""
+        if not text.strip():
+            return []
+
+        # 简单的分句逻辑
+        sentences = []
+        separators = ['. ', '。', '！', '？', '!', '?', '\n\n']
+
+        current_sentences = [text]
+
+        for sep in separators:
+            new_sentences = []
+            for sentence in current_sentences:
+                parts = sentence.split(sep)
+                if len(parts) > 1:
+                    # 保留分隔符
+                    for i, part in enumerate(parts[:-1]):
+                        if part.strip():
+                            new_sentences.append(part.strip() + sep.rstrip())
+                    # 最后一部分
+                    if parts[-1].strip():
+                        new_sentences.append(parts[-1].strip())
+                else:
+                    new_sentences.append(sentence)
+            current_sentences = new_sentences
+
+        # 过滤掉太短的句子
+        valid_sentences = [s for s in current_sentences if len(s.strip()) > 3]
+        return valid_sentences
+
+    def _split_ocr_text(self, ocr_text: str) -> List[str]:
+        """分割OCR识别的文字"""
+        if not ocr_text.strip():
+            return []
+
+        # OCR结果可能包含表格或特殊格式，需要特殊处理
+        lines = ocr_text.split('\n')
+        sentences = []
+
+        current_paragraph = []
+
+        for line in lines:
+            line = line.strip()
+            if not line:
+                # 空行表示段落结束
+                if current_paragraph:
+                    paragraph_text = ' '.join(current_paragraph)
+                    if len(paragraph_text) > 10:
+                        sentences.append(paragraph_text)
+                    current_paragraph = []
+                continue
+
+            # 检查是否是表格行（包含|或多个制表符）
+            if '|' in line or '\t' in line:
+                # 表格行单独处理
+                if current_paragraph:
+                    paragraph_text = ' '.join(current_paragraph)
+                    if len(paragraph_text) > 10:
+                        sentences.append(paragraph_text)
+                    current_paragraph = []
+
+                if len(line) > 10:
+                    sentences.append(line)
+            else:
+                # 普通文字行
+                current_paragraph.append(line)
+
+        # 处理最后的段落
+        if current_paragraph:
+            paragraph_text = ' '.join(current_paragraph)
+            if len(paragraph_text) > 10:
+                sentences.append(paragraph_text)
+
+        return sentences
+
+    def generate_translated_document(self, translations: dict, target_language: str,
+                                   output_dir: Path) -> str:
+        """生成翻译的Word文档（保持与DOCX相同的格式）"""
+        try:
+            from app.utils.helpers import generate_filename
+
+            translated_texts = translations.get(target_language, [])
+
+            # 生成Word文档而非文字文件
+            output_filename = f"{self.file_path.stem}_{target_language}_translated.docx"
+            output_path = output_dir / output_filename
+
+            # 创建Word文档
+            from docx import Document
+            from docx.shared import Pt
+            from docx.enum.text import WD_PARAGRAPH_ALIGNMENT
+
+            doc = Document()
+
+            # 添加标题页
+            title = doc.add_heading(f"PDF翻译结果 - {target_language}", 0)
+            title.alignment = WD_PARAGRAPH_ALIGNMENT.CENTER
+
+            # 添加文档信息
+            info_para = doc.add_paragraph()
+            info_para.add_run("原始文件: ").bold = True
+            info_para.add_run(self.file_path.name)
+            info_para.add_run("\n处理方式: ").bold = True
+            info_para.add_run("OCR识别" if self.is_scanned_pdf() else "直接文字提取")
+            info_para.add_run(f"\n翻译语言: ").bold = True
+            info_para.add_run(target_language)
+            info_para.add_run(f"\n总段落数: ").bold = True
+            info_para.add_run(str(len(translated_texts)))
+
+            doc.add_paragraph()  # 空行
+
+            # 添加翻译内容
+            for i, text in enumerate(translated_texts, 1):
+                content_type = self._detect_content_type(text)
+
+                if content_type == 'table':
+                    # 尝试创建实际的表格
+                    self._add_table_content(doc, text, i)
+                elif content_type == 'heading':
+                    # 添加标题
+                    self._add_heading_content(doc, text, i)
+                elif content_type == 'list':
+                    # 添加列表
+                    self._add_list_content(doc, text, i)
+                else:
+                    # 普通段落
+                    self._add_paragraph_content(doc, text, i)
+
+            # 保存Word文档
+            doc.save(output_path)
+            logger.info(f"Generated translated PDF Word document: {output_path}")
+            return str(output_path)
+
+        except Exception as e:
+            logger.error(f"Failed to generate translated Word document: {str(e)}")
+            raise FileProcessingError(f"生成翻译Word文档失败: {str(e)}")
+
+    def generate_combined_translated_document(self, all_translations: dict, target_languages: list,
+                                            output_dir: Path) -> str:
+        """生成包含所有翻譯語言的組合Word文檔（譯文1/譯文2格式）"""
+        try:
+            from app.utils.helpers import generate_filename
+
+            # 生成組合文檔檔名
+            languages_suffix = '_'.join(target_languages)
+            output_filename = f"{self.file_path.stem}_{languages_suffix}_combined.docx"
+            output_path = output_dir / output_filename
+
+            # 创建Word文档
+            from docx import Document
+            from docx.shared import Pt
+            from docx.enum.text import WD_PARAGRAPH_ALIGNMENT
+
+            doc = Document()
+
+            # 添加标题页
+            title = doc.add_heading(f"PDF翻译結果 - 多語言組合文檔", 0)
+            title.alignment = WD_PARAGRAPH_ALIGNMENT.CENTER
+
+            # 添加文档信息
+            info_para = doc.add_paragraph()
+            info_para.add_run("原始文件: ").bold = True
+            info_para.add_run(self.file_path.name)
+            info_para.add_run("\n处理方式: ").bold = True
+            info_para.add_run("OCR识别" if self.is_scanned_pdf() else "直接文字提取")
+            info_para.add_run(f"\n翻译语言: ").bold = True
+            info_para.add_run(' / '.join(target_languages))
+
+            # 获取第一个語言的翻譯作為基準長度
+            first_language = target_languages[0]
+            segment_count = len(all_translations.get(first_language, []))
+            info_para.add_run(f"\n总段落数: ").bold = True
+            info_para.add_run(str(segment_count))
+
+            doc.add_paragraph()  # 空行
+
+            # 添加翻译内容 - 譯文1/譯文2格式
+            for i in range(segment_count):
+                content_para = doc.add_paragraph()
+
+                # 添加段落编号
+                num_run = content_para.add_run(f"{i+1:03d}. ")
+                num_run.bold = True
+                num_run.font.size = Pt(12)
+
+                # 为每种语言添加翻譯
+                for j, target_language in enumerate(target_languages):
+                    if i < len(all_translations.get(target_language, [])):
+                        translation_text = all_translations[target_language][i]
+
+                        # 添加語言標識
+                        if j > 0:
+                            content_para.add_run("\n\n")  # 翻譯之間的間距
+
+                        lang_run = content_para.add_run(f"[{target_language}] ")
+                        lang_run.bold = True
+                        lang_run.font.size = Pt(11)
+
+                        # 添加翻譯内容
+                        trans_run = content_para.add_run(translation_text)
+                        trans_run.font.size = Pt(11)
+
+                # 段落間距
+                content_para.paragraph_format.space_after = Pt(12)
+
+            # 保存Word文档
+            doc.save(output_path)
+            logger.info(f"Generated combined translated PDF Word document: {output_path}")
+            return str(output_path)
+
+        except Exception as e:
+            logger.error(f"Failed to generate combined translated Word document: {str(e)}")
+            raise FileProcessingError(f"生成組合翻译Word文档失败: {str(e)}")
+
+    def _is_table_component(self, segment: str) -> bool:
+        """檢查段落是否為表格組件（表格邊界、分隔線等）"""
+        segment = segment.strip()
+
+        # Markdown表格分隔線：如 |---|---|---| 或 |===|===|===|
+        if '|' in segment and ('-' in segment or '=' in segment):
+            # 移除 | 和 - = 後，如果剩餘內容很少，則判斷為表格分隔線
+            clean_segment = segment.replace('|', '').replace('-', '').replace('=', '').replace(' ', '').replace(':', '')
+            if len(clean_segment) <= 2:  # 允許少量其他字符
+                return True
+
+        # 純分隔線
+        if segment.replace('=', '').replace('-', '').replace(' ', '') == '':
+            return True
+
+        return False
+
+    def _is_table_row(self, segment: str) -> bool:
+        """檢查段落是否為表格行（包含實際數據的表格行）"""
+        segment = segment.strip()
+
+        # Markdown表格行：至少包含兩個 | 符號，且有實際內容
+        if segment.count('|') >= 2:
+            # 移除首尾的 | 並分割為單元格
+            cells = segment.strip('|').split('|')
+            # 檢查是否有實際的文字內容（不只是分隔符號）
+            has_content = any(
+                cell.strip() and
+                not cell.replace('-', '').replace('=', '').replace(' ', '').replace(':', '') == ''
+                for cell in cells
+            )
+            if has_content:
+                return True
+
+        return False
+
+    def _merge_table_segments(self, segments: List[str], start_idx: int) -> tuple[str, int]:
+        """
+        合併表格相關的段落
+
+        Returns:
+            (merged_table_content, next_index)
+        """
+        table_parts = []
+        current_idx = start_idx
+
+        # 收集連續的表格相關段落
+        while current_idx < len(segments):
+            segment = segments[current_idx].strip()
+
+            if self._is_table_component(segment) or self._is_table_row(segment):
+                table_parts.append(segment)
+                current_idx += 1
+            else:
+                break
+
+        # 將表格部分合併為一個段落
+        merged_table = '\n'.join(table_parts)
+        return merged_table, current_idx
+
+    def _merge_short_segments(self, text_segments: List[str], min_length: int = 10) -> List[str]:
+        """
+        合併短段落以減少不必要的翻譯調用，特別處理表格結構
+
+        Args:
+            text_segments: 原始文字段落列表
+            min_length: 最小段落長度閾值，短於此長度的段落將被合併
+
+        Returns:
+            合併後的段落列表
+        """
+        if not text_segments:
+            return text_segments
+
+        merged_segments = []
+        current_merge = ""
+        i = 0
+
+        while i < len(text_segments):
+            segment = text_segments[i].strip()
+            if not segment:  # 跳過空段落
+                i += 1
+                continue
+
+            # 檢查是否為表格組件
+            if self._is_table_component(segment) or self._is_table_row(segment):
+                # 先處理之前積累的短段落
+                if current_merge:
+                    merged_segments.append(current_merge.strip())
+                    logger.debug(f"Merged short segments before table: '{current_merge[:50]}...'")
+                    current_merge = ""
+
+                # 合併表格相關段落
+                table_content, next_i = self._merge_table_segments(text_segments, i)
+                merged_segments.append(table_content)
+                logger.debug(f"Merged table content: {next_i - i} segments -> 1 table block")
+                i = next_i
+                continue
+
+            # 檢查是否為短段落
+            if len(segment) < min_length:
+                # 檢查是否為純標點符號或數字（排除表格符號）
+                if segment.replace('*', '').replace('-', '').replace('_', '').replace('#', '').strip() == '':
+                    logger.debug(f"Skipping pure symbol segment: '{segment}'")
+                    i += 1
+                    continue
+
+                # 短段落需要合併
+                if current_merge:
+                    current_merge += " " + segment
+                else:
+                    current_merge = segment
+
+                logger.debug(f"Adding short segment to merge: '{segment}' (length: {len(segment)})")
+
+            else:
+                # 長段落，先處理之前積累的短段落
+                if current_merge:
+                    merged_segments.append(current_merge.strip())
+                    logger.debug(f"Merged short segments: '{current_merge[:50]}...' (total length: {len(current_merge)})")
+                    current_merge = ""
+
+                # 添加當前長段落
+                merged_segments.append(segment)
+                logger.debug(f"Added long segment: '{segment[:50]}...' (length: {len(segment)})")
+
+            i += 1
+
+        # 處理最後剩餘的短段落
+        if current_merge:
+            merged_segments.append(current_merge.strip())
+            logger.debug(f"Final merged short segments: '{current_merge[:50]}...' (total length: {len(current_merge)})")
+
+        logger.info(f"Segment merging: {len(text_segments)} -> {len(merged_segments)} segments")
+        return merged_segments
+
+    def _detect_content_type(self, text: str) -> str:
+        """检测内容类型"""
+        text_lower = text.lower().strip()
+
+        # 检测表格（包含多个|或制表符）
+        if ('|' in text and text.count('|') >= 2) or '\t' in text:
+            return 'table'
+
+        # 检测标题
+        if (text_lower.startswith(('第', '章', 'chapter', 'section', '#')) or
+            any(keyword in text_lower for keyword in ['章', '节', '第']) and len(text) < 100):
+            return 'heading'
+
+        # 检测列表
+        if (text_lower.startswith(('•', '-', '*', '1.', '2.', '3.', '4.', '5.')) or
+            any(text_lower.startswith(f"{i}.") for i in range(1, 20))):
+            return 'list'
+
+        return 'paragraph'
+
+    def _add_table_content(self, doc, text: str, index: int):
+        """添加表格内容"""
+        from docx.shared import Pt
+
+        # 添加表格标题
+        title_para = doc.add_paragraph()
+        title_run = title_para.add_run(f"表格 {index}: ")
+        title_run.bold = True
+        title_run.font.size = Pt(12)
+
+        # 解析表格
+        if '|' in text:
+            # Markdown风格表格
+            lines = [line.strip() for line in text.split('\n') if line.strip()]
+            rows = []
+            for line in lines:
+                if line.startswith('|') and line.endswith('|'):
+                    cells = [cell.strip() for cell in line.split('|')[1:-1]]
+                    if cells:  # 过滤掉分隔行（如|---|---|）
+                        if not all(cell.replace('-', '').replace(' ', '') == '' for cell in cells):
+                            rows.append(cells)
+
+            if rows:
+                # 创建表格
+                table = doc.add_table(rows=len(rows), cols=len(rows[0]))
+                table.style = 'Table Grid'
+
+                for i, row_data in enumerate(rows):
+                    for j, cell_data in enumerate(row_data):
+                        if j < len(table.rows[i].cells):
+                            cell = table.rows[i].cells[j]
+                            cell.text = cell_data
+                            # 设置字体
+                            for paragraph in cell.paragraphs:
+                                for run in paragraph.runs:
+                                    run.font.size = Pt(10)
+        else:
+            # 制表符分隔的表格
+            para = doc.add_paragraph()
+            content_run = para.add_run(text)
+            content_run.font.name = 'Courier New'
+            content_run.font.size = Pt(10)
+
+    def _add_heading_content(self, doc, text: str, index: int):
+        """添加标题内容"""
+        from docx.shared import Pt
+
+        # 移除段落编号，直接作为标题
+        clean_text = text.strip()
+        if len(clean_text) < 100:
+            heading = doc.add_heading(clean_text, level=2)
+        else:
+            # 长文本作为普通段落但使用标题样式
+            para = doc.add_paragraph()
+            run = para.add_run(clean_text)
+            run.bold = True
+            run.font.size = Pt(14)
+
+    def _add_list_content(self, doc, text: str, index: int):
+        """添加列表内容"""
+        from docx.shared import Pt
+
+        # 检查是否已经有编号
+        if any(text.strip().startswith(f"{i}.") for i in range(1, 20)):
+            # 已编号列表
+            para = doc.add_paragraph(text.strip(), style='List Number')
+        else:
+            # 项目符号列表
+            para = doc.add_paragraph(text.strip(), style='List Bullet')
+
+        # 设置字体大小
+        for run in para.runs:
+            run.font.size = Pt(11)
+
+    def _add_paragraph_content(self, doc, text: str, index: int):
+        """添加普通段落内容"""
+        from docx.shared import Pt
+
+        para = doc.add_paragraph()
+
+        # 添加段落编号（可选）
+        num_run = para.add_run(f"{index:03d}. ")
+        num_run.bold = True
+        num_run.font.size = Pt(12)
+
+        # 添加内容
+        content_run = para.add_run(text)
+        content_run.font.size = Pt(11)
+
+        # 设置段落间距
+        para.paragraph_format.space_after = Pt(6)

app/services/notification_service.py

@@ -0,0 +1,647 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+通知服務
+
+Author: PANJIT IT Team
+Created: 2024-01-28
+Modified: 2024-01-28
+"""
+
+import os
+import smtplib
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+from datetime import datetime, timedelta
+from typing import Optional, List, Dict, Any
+from flask import current_app, url_for
+from app import db
+from app.utils.logger import get_logger
+from app.models.job import TranslationJob
+from app.models.user import User
+from app.models.notification import Notification, NotificationType
+
+logger = get_logger(__name__)
+
+
+class NotificationService:
+    """通知服務"""
+    
+    def __init__(self):
+        self.smtp_server = current_app.config.get('SMTP_SERVER')
+        self.smtp_port = current_app.config.get('SMTP_PORT', 587)
+        self.use_tls = current_app.config.get('SMTP_USE_TLS', False)
+        self.use_ssl = current_app.config.get('SMTP_USE_SSL', False)
+        self.auth_required = current_app.config.get('SMTP_AUTH_REQUIRED', False)
+        self.sender_email = current_app.config.get('SMTP_SENDER_EMAIL')
+        self.sender_password = current_app.config.get('SMTP_SENDER_PASSWORD', '')
+        self.app_name = current_app.config.get('APP_NAME', 'PANJIT Document Translator')
+    
+    def _create_smtp_connection(self):
+        """建立 SMTP 連線"""
+        try:
+            if self.use_ssl:
+                server = smtplib.SMTP_SSL(self.smtp_server, self.smtp_port)
+            else:
+                server = smtplib.SMTP(self.smtp_server, self.smtp_port)
+                if self.use_tls:
+                    server.starttls()
+            
+            if self.auth_required and self.sender_password:
+                server.login(self.sender_email, self.sender_password)
+            
+            return server
+        except Exception as e:
+            logger.error(f"SMTP connection failed: {str(e)}")
+            return None
+    
+    def _send_email(self, to_email: str, subject: str, html_content: str, text_content: str = None) -> bool:
+        """發送郵件的基礎方法 - 已停用 (資安限制，無法連接內網)"""
+        logger.info(f"SMTP service disabled - Email notification skipped for {to_email}: {subject}")
+        return True  # 回傳 True 避免影響其他流程
+
+        # 以下 SMTP 功能已註解，因應資安限制無法連接內網
+        # try:
+        #     if not self.smtp_server or not self.sender_email:
+        #         logger.error("SMTP configuration incomplete")
+        #         return False
+        #
+        #     # 建立郵件
+        #     msg = MIMEMultipart('alternative')
+        #     msg['From'] = f"{self.app_name} <{self.sender_email}>"
+        #     msg['To'] = to_email
+        #     msg['Subject'] = subject
+        #
+        #     # 添加文本內容
+        #     if text_content:
+        #         text_part = MIMEText(text_content, 'plain', 'utf-8')
+        #         msg.attach(text_part)
+        #
+        #     # 添加 HTML 內容
+        #     html_part = MIMEText(html_content, 'html', 'utf-8')
+        #     msg.attach(html_part)
+        #
+        #     # 發送郵件
+        #     server = self._create_smtp_connection()
+        #     if not server:
+        #         return False
+        #
+        #     server.send_message(msg)
+        #     server.quit()
+        #
+        #     logger.info(f"Email sent successfully to {to_email}")
+        #     return True
+        #
+        # except Exception as e:
+        #     logger.error(f"Failed to send email to {to_email}: {str(e)}")
+        #     return False
+    
+    def send_job_completion_notification(self, job: TranslationJob) -> bool:
+        """發送任務完成通知"""
+        try:
+            if not job.user or not job.user.email:
+                logger.warning(f"No email address for job {job.job_uuid}")
+                return False
+            
+            # 準備郵件內容
+            subject = f"📄 翻譯完成通知 - {job.original_filename}"
+            
+            # 計算處理時間
+            processing_time = ""
+            if job.processing_started_at and job.completed_at:
+                duration = job.completed_at - job.processing_started_at
+                total_seconds = int(duration.total_seconds())
+                
+                if total_seconds < 60:
+                    processing_time = f"{total_seconds}秒"
+                elif total_seconds < 3600:
+                    minutes = total_seconds // 60
+                    seconds = total_seconds % 60
+                    processing_time = f"{minutes}分{seconds}秒"
+                else:
+                    hours = total_seconds // 3600
+                    minutes = (total_seconds % 3600) // 60
+                    processing_time = f"{hours}小時{minutes}分"
+            
+            # 生成下載連結（簡化版本）
+            download_links = []
+            for lang in job.target_languages:
+                download_links.append(f"• {lang}: [下載翻譯檔案]")
+            
+            html_content = f"""
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <meta charset="utf-8">
+                <style>
+                    body {{ font-family: Arial, sans-serif; line-height: 1.6; color: #333; }}
+                    .container {{ max-width: 600px; margin: 0 auto; padding: 20px; }}
+                    .header {{ background-color: #2563eb; color: white; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; }}
+                    .content {{ background-color: #f8fafc; padding: 30px; border: 1px solid #e5e7eb; }}
+                    .info-box {{ background-color: #dbeafe; border-left: 4px solid #2563eb; padding: 15px; margin: 20px 0; }}
+                    .footer {{ background-color: #374151; color: #d1d5db; padding: 15px; text-align: center; font-size: 12px; border-radius: 0 0 8px 8px; }}
+                    .success {{ color: #059669; font-weight: bold; }}
+                    .download-section {{ margin: 20px 0; }}
+                    .download-link {{ display: inline-block; background-color: #2563eb; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; margin: 5px; }}
+                </style>
+            </head>
+            <body>
+                <div class="container">
+                    <div class="header">
+                        <h1>🎉 翻譯任務完成</h1>
+                    </div>
+                    
+                    <div class="content">
+                        <p>親愛的 <strong>{job.user.display_name}</strong>，</p>
+                        
+                        <p class="success">您的文件翻譯任務已成功完成！</p>
+                        
+                        <div class="info-box">
+                            <h3>📋 任務詳細資訊</h3>
+                            <p><strong>檔案名稱:</strong> {job.original_filename}</p>
+                            <p><strong>任務編號:</strong> {job.job_uuid}</p>
+                            <p><strong>來源語言:</strong> {job.source_language}</p>
+                            <p><strong>目標語言:</strong> {', '.join(job.target_languages)}</p>
+                            <p><strong>處理時間:</strong> {processing_time}</p>
+                            <p><strong>完成時間:</strong> {job.completed_at.strftime('%Y-%m-%d %H:%M:%S') if job.completed_at else '未知'}</p>
+                            {f'<p><strong>總成本:</strong> ${job.total_cost:.4f}</p>' if job.total_cost else ''}
+                        </div>
+                        
+                        <div class="download-section">
+                            <h3>📥 下載翻譯檔案</h3>
+                            <p>請登入系統下載您的翻譯檔案：</p>
+                            <p>{'<br>'.join(download_links)}</p>
+                            <p style="margin-top: 15px;">
+                                <strong>注意:</strong> 翻譯檔案將在系統中保留 7 天，請及時下載。
+                            </p>
+                        </div>
+                        
+                        <div style="margin-top: 30px; padding-top: 20px; border-top: 1px solid #e5e7eb;">
+                            <p>感謝您使用 {self.app_name}！</p>
+                            <p>如有任何問題，請聯繫系統管理員。</p>
+                        </div>
+                    </div>
+                    
+                    <div class="footer">
+                        <p>此郵件由 {self.app_name} 系統自動發送，請勿回覆。</p>
+                        <p>發送時間: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}</p>
+                    </div>
+                </div>
+            </body>
+            </html>
+            """
+            
+            # 純文字版本
+            text_content = f"""
+            翻譯任務完成通知
+            
+            親愛的 {job.user.display_name}，
+            
+            您的文件翻譯任務已成功完成！
+            
+            任務詳細資訊:
+            - 檔案名稱: {job.original_filename}
+            - 任務編號: {job.job_uuid}
+            - 來源語言: {job.source_language}
+            - 目標語言: {', '.join(job.target_languages)}
+            - 處理時間: {processing_time}
+            - 完成時間: {job.completed_at.strftime('%Y-%m-%d %H:%M:%S') if job.completed_at else '未知'}
+            
+            請登入系統下載您的翻譯檔案。翻譯檔案將在系統中保留 7 天。
+            
+            感謝您使用 {self.app_name}！
+            
+            ----
+            此郵件由系統自動發送，請勿回覆。
+            """
+            
+            return self._send_email(job.user.email, subject, html_content, text_content)
+        
+        except Exception as e:
+            logger.error(f"Failed to send completion notification for job {job.job_uuid}: {str(e)}")
+            return False
+    
+    def send_job_failure_notification(self, job: TranslationJob) -> bool:
+        """發送任務失敗通知"""
+        try:
+            if not job.user or not job.user.email:
+                logger.warning(f"No email address for job {job.job_uuid}")
+                return False
+            
+            subject = f"⚠️ 翻譯失敗通知 - {job.original_filename}"
+            
+            html_content = f"""
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <meta charset="utf-8">
+                <style>
+                    body {{ font-family: Arial, sans-serif; line-height: 1.6; color: #333; }}
+                    .container {{ max-width: 600px; margin: 0 auto; padding: 20px; }}
+                    .header {{ background-color: #dc2626; color: white; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; }}
+                    .content {{ background-color: #f8fafc; padding: 30px; border: 1px solid #e5e7eb; }}
+                    .error-box {{ background-color: #fef2f2; border-left: 4px solid #dc2626; padding: 15px; margin: 20px 0; }}
+                    .footer {{ background-color: #374151; color: #d1d5db; padding: 15px; text-align: center; font-size: 12px; border-radius: 0 0 8px 8px; }}
+                    .error {{ color: #dc2626; font-weight: bold; }}
+                </style>
+            </head>
+            <body>
+                <div class="container">
+                    <div class="header">
+                        <h1>❌ 翻譯任務失敗</h1>
+                    </div>
+                    
+                    <div class="content">
+                        <p>親愛的 <strong>{job.user.display_name}</strong>，</p>
+                        
+                        <p class="error">很抱歉，您的文件翻譯任務處理失敗。</p>
+                        
+                        <div class="error-box">
+                            <h3>📋 任務資訊</h3>
+                            <p><strong>檔案名稱:</strong> {job.original_filename}</p>
+                            <p><strong>任務編號:</strong> {job.job_uuid}</p>
+                            <p><strong>重試次數:</strong> {job.retry_count}</p>
+                            <p><strong>錯誤訊息:</strong> {job.error_message or '未知錯誤'}</p>
+                            <p><strong>失敗時間:</strong> {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}</p>
+                        </div>
+                        
+                        <div style="margin-top: 20px;">
+                            <p><strong>建議處理方式:</strong></p>
+                            <ul>
+                                <li>檢查檔案格式是否正確</li>
+                                <li>確認檔案沒有損壞</li>
+                                <li>稍後再次嘗試上傳</li>
+                                <li>如問題持續，請聯繫系統管理員</li>
+                            </ul>
+                        </div>
+                        
+                        <div style="margin-top: 30px; padding-top: 20px; border-top: 1px solid #e5e7eb;">
+                            <p>如需協助，請聯繫系統管理員。</p>
+                        </div>
+                    </div>
+                    
+                    <div class="footer">
+                        <p>此郵件由 {self.app_name} 系統自動發送，請勿回覆。</p>
+                        <p>發送時間: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}</p>
+                    </div>
+                </div>
+            </body>
+            </html>
+            """
+            
+            text_content = f"""
+            翻譯任務失敗通知
+            
+            親愛的 {job.user.display_name}，
+            
+            很抱歉，您的文件翻譯任務處理失敗。
+            
+            任務資訊:
+            - 檔案名稱: {job.original_filename}
+            - 任務編號: {job.job_uuid}
+            - 重試次數: {job.retry_count}
+            - 錯誤訊息: {job.error_message or '未知錯誤'}
+            
+            建議處理方式:
+            1. 檢查檔案格式是否正確
+            2. 確認檔案沒有損壞
+            3. 稍後再次嘗試上傳
+            4. 如問題持續，請聯繫系統管理員
+            
+            如需協助，請聯繫系統管理員。
+            
+            ----
+            此郵件由 {self.app_name} 系統自動發送，請勿回覆。
+            """
+            
+            return self._send_email(job.user.email, subject, html_content, text_content)
+        
+        except Exception as e:
+            logger.error(f"Failed to send failure notification for job {job.job_uuid}: {str(e)}")
+            return False
+    
+    def send_admin_notification(self, subject: str, message: str, admin_emails: List[str] = None) -> bool:
+        """發送管理員通知"""
+        try:
+            if not admin_emails:
+                # 取得所有管理員郵件地址
+                admin_users = User.get_admin_users()
+                admin_emails = [user.email for user in admin_users if user.email]
+            
+            if not admin_emails:
+                logger.warning("No admin email addresses found")
+                return False
+            
+            html_content = f"""
+            <!DOCTYPE html>
+            <html>
+            <head>
+                <meta charset="utf-8">
+                <style>
+                    body {{ font-family: Arial, sans-serif; line-height: 1.6; color: #333; }}
+                    .container {{ max-width: 600px; margin: 0 auto; padding: 20px; }}
+                    .header {{ background-color: #f59e0b; color: white; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; }}
+                    .content {{ background-color: #f8fafc; padding: 30px; border: 1px solid #e5e7eb; }}
+                    .footer {{ background-color: #374151; color: #d1d5db; padding: 15px; text-align: center; font-size: 12px; border-radius: 0 0 8px 8px; }}
+                </style>
+            </head>
+            <body>
+                <div class="container">
+                    <div class="header">
+                        <h1>🔔 系統管理通知</h1>
+                    </div>
+                    
+                    <div class="content">
+                        <p>系統管理員您好，</p>
+                        
+                        <div style="background-color: #fef3c7; border-left: 4px solid #f59e0b; padding: 15px; margin: 20px 0;">
+                            <h3>{subject}</h3>
+                            <p>{message}</p>
+                        </div>
+                        
+                        <p>發送時間: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}</p>
+                    </div>
+                    
+                    <div class="footer">
+                        <p>此郵件由 {self.app_name} 系統自動發送，請勿回覆。</p>
+                    </div>
+                </div>
+            </body>
+            </html>
+            """
+            
+            success_count = 0
+            for email in admin_emails:
+                if self._send_email(email, f"[管理通知] {subject}", html_content):
+                    success_count += 1
+            
+            return success_count > 0
+        
+        except Exception as e:
+            logger.error(f"Failed to send admin notification: {str(e)}")
+            return False
+    
+    def test_smtp_connection(self) -> bool:
+        """測試 SMTP 連線"""
+        try:
+            server = self._create_smtp_connection()
+            if server:
+                server.quit()
+                return True
+            return False
+        except Exception as e:
+            logger.error(f"SMTP connection test failed: {str(e)}")
+            return False
+    
+    # ========== 資料庫通知方法 ==========
+    
+    def create_db_notification(
+        self,
+        user_id: int,
+        title: str,
+        message: str,
+        notification_type: NotificationType = NotificationType.INFO,
+        job_uuid: Optional[str] = None,
+        extra_data: Optional[Dict[str, Any]] = None,
+        expires_at: Optional[datetime] = None,
+        link: Optional[str] = None
+    ) -> Optional[Notification]:
+        """
+        創建資料庫通知
+        
+        Args:
+            user_id: 用戶ID
+            title: 通知標題
+            message: 通知內容
+            notification_type: 通知類型
+            job_uuid: 關聯任務UUID
+            extra_data: 額外數據
+            expires_at: 過期時間
+            link: 相關連結
+        
+        Returns:
+            Notification: 創建的通知對象
+        """
+        try:
+            # 如果沒有指定連結但有任務UUID，自動生成任務詳情連結
+            if not link and job_uuid:
+                link = f"/job/{job_uuid}"
+            
+            notification = Notification(
+                user_id=user_id,
+                type=notification_type.value,
+                title=title,
+                message=message,
+                job_uuid=job_uuid,
+                link=link,
+                extra_data=extra_data,
+                expires_at=expires_at
+            )
+            
+            db.session.add(notification)
+            db.session.commit()
+            
+            logger.info(f"資料庫通知已創建: {notification.notification_uuid} for user {user_id}")
+            
+            # WebSocket 推送已禁用
+            # self._send_websocket_notification(notification)
+            
+            return notification
+            
+        except Exception as e:
+            db.session.rollback()
+            logger.error(f"創建資料庫通知失敗: {e}")
+            return None
+    
+    def send_job_started_db_notification(self, job: TranslationJob) -> Optional[Notification]:
+        """
+        發送任務開始處理的資料庫通知
+        
+        Args:
+            job: 翻譯任務對象
+        
+        Returns:
+            Notification: 創建的通知對象
+        """
+        try:
+            title = "翻譯任務開始處理"
+            message = f'您的文件「{job.original_filename}」已開始翻譯處理。'
+            
+            if job.target_languages:
+                languages = ', '.join(job.target_languages)
+                message += f" 目標語言: {languages}"
+            
+            return self.create_db_notification(
+                user_id=job.user_id,
+                title=title,
+                message=message,
+                notification_type=NotificationType.INFO,
+                job_uuid=job.job_uuid,
+                extra_data={
+                    'filename': job.original_filename,
+                    'target_languages': job.target_languages,
+                    'started_at': job.processing_started_at.isoformat() if job.processing_started_at else None
+                }
+            )
+            
+        except Exception as e:
+            logger.error(f"發送任務開始資料庫通知失敗: {e}")
+            return None
+    
+    def send_job_completion_db_notification(self, job: TranslationJob) -> Optional[Notification]:
+        """
+        發送任務完成的資料庫通知
+        
+        Args:
+            job: 翻譯任務對象
+        
+        Returns:
+            Notification: 創建的通知對象
+        """
+        try:
+            if job.status != 'COMPLETED':
+                logger.warning(f"任務 {job.job_uuid} 狀態不是已完成，跳過完成通知")
+                return None
+            
+            # 構建通知內容
+            title = "翻譯任務完成"
+            message = f'您的文件「{job.original_filename}」已成功翻譯完成。'
+            
+            # 添加目標語言信息
+            if job.target_languages:
+                languages = ', '.join(job.target_languages)
+                message += f" 目標語言: {languages}"
+            
+            # 添加處理時間信息
+            if job.processing_started_at and job.completed_at:
+                duration = job.completed_at - job.processing_started_at
+                minutes = int(duration.total_seconds() / 60)
+                if minutes > 0:
+                    message += f" 處理時間: {minutes} 分鐘"
+                else:
+                    message += f" 處理時間: {int(duration.total_seconds())} 秒"
+            
+            return self.create_db_notification(
+                user_id=job.user_id,
+                title=title,
+                message=message,
+                notification_type=NotificationType.SUCCESS,
+                job_uuid=job.job_uuid,
+                extra_data={
+                    'filename': job.original_filename,
+                    'target_languages': job.target_languages,
+                    'total_cost': float(job.total_cost) if job.total_cost else 0,
+                    'completed_at': job.completed_at.isoformat() if job.completed_at else None
+                }
+            )
+            
+        except Exception as e:
+            logger.error(f"發送任務完成資料庫通知失敗: {e}")
+            return None
+    
+    def send_job_completion_db_notification_direct(self, job: TranslationJob) -> Optional[Notification]:
+        """
+        直接發送任務完成的資料庫通知（不檢查狀態）
+        """
+        try:
+            # 構建通知內容
+            title = "翻譯任務完成"
+            message = f'您的文件「{job.original_filename}」已成功翻譯完成。'
+            
+            # 添加目標語言信息
+            if job.target_languages:
+                languages = ', '.join(job.target_languages)
+                message += f" 目標語言: {languages}"
+            
+            message += " 您可以在任務列表中下載翻譯結果。"
+            
+            # 創建資料庫通知
+            return self.create_db_notification(
+                user_id=job.user_id,
+                title=title,
+                message=message,
+                notification_type=NotificationType.SUCCESS,
+                job_uuid=job.job_uuid,
+                extra_data={
+                    'filename': job.original_filename,
+                    'target_languages': job.target_languages,
+                    'total_cost': float(job.total_cost) if job.total_cost else 0,
+                    'completed_at': job.completed_at.isoformat() if job.completed_at else None
+                }
+            )
+            
+        except Exception as e:
+            logger.error(f"發送任務完成資料庫通知失敗: {e}")
+            return None
+    
+    def send_job_failure_db_notification(self, job: TranslationJob, error_message: str = None) -> Optional[Notification]:
+        """
+        發送任務失敗的資料庫通知
+        
+        Args:
+            job: 翻譯任務對象
+            error_message: 錯誤訊息
+        
+        Returns:
+            Notification: 創建的通知對象
+        """
+        try:
+            title = "翻譯任務失敗"
+            message = f'您的文件「{job.original_filename}」翻譯失敗。'
+            
+            if error_message:
+                message += f" 錯誤訊息: {error_message}"
+            
+            if job.retry_count > 0:
+                message += f" 已重試 {job.retry_count} 次。"
+            
+            return self.create_db_notification(
+                user_id=job.user_id,
+                title=title,
+                message=message,
+                notification_type=NotificationType.ERROR,
+                job_uuid=job.job_uuid,
+                extra_data={
+                    'filename': job.original_filename,
+                    'error_message': error_message,
+                    'retry_count': job.retry_count,
+                    'failed_at': datetime.now().isoformat()
+                }
+            )
+            
+        except Exception as e:
+            logger.error(f"發送任務失敗資料庫通知失敗: {e}")
+            return None
+    
+    def _send_websocket_notification(self, notification: Notification):
+        """
+        通過 WebSocket 發送通知 - 已禁用
+
+        Args:
+            notification: 通知對象
+        """
+        # WebSocket 功能已完全禁用
+        logger.debug(f"WebSocket 推送已禁用，跳過通知: {notification.notification_uuid}")
+        pass
+    
+    def get_unread_count(self, user_id: int) -> int:
+        """
+        獲取用戶未讀通知數量
+        
+        Args:
+            user_id: 用戶ID
+        
+        Returns:
+            int: 未讀通知數量
+        """
+        try:
+            return Notification.query.filter_by(
+                user_id=user_id,
+                is_read=False
+            ).filter(
+                (Notification.expires_at.is_(None)) | 
+                (Notification.expires_at > datetime.now())
+            ).count()
+        except Exception as e:
+            logger.error(f"獲取未讀通知數量失敗: {e}")
+            return 0

app/services/ocr_cache.py

@@ -0,0 +1,282 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+OCR 快取管理模組
+
+Author: PANJIT IT Team
+Created: 2024-01-28
+Modified: 2024-01-28
+"""
+
+import hashlib
+import json
+import sqlite3
+from datetime import datetime, timedelta
+from pathlib import Path
+from typing import Optional, Dict, Any
+import logging
+
+logger = logging.getLogger(__name__)
+
+class OCRCache:
+    """OCR 結果快取管理器"""
+
+    def __init__(self, cache_db_path: str = "ocr_cache.db", cache_expire_days: int = 30):
+        """
+        初始化 OCR 快取管理器
+
+        Args:
+            cache_db_path: 快取資料庫路徑
+            cache_expire_days: 快取過期天數
+        """
+        self.cache_db_path = Path(cache_db_path)
+        self.cache_expire_days = cache_expire_days
+        self.init_database()
+
+    def init_database(self):
+        """初始化快取資料庫"""
+        try:
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+                cursor.execute('''
+                    CREATE TABLE IF NOT EXISTS ocr_cache (
+                        id INTEGER PRIMARY KEY AUTOINCREMENT,
+                        file_hash TEXT UNIQUE NOT NULL,
+                        filename TEXT,
+                        file_size INTEGER,
+                        extracted_text TEXT NOT NULL,
+                        extraction_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                        access_count INTEGER DEFAULT 1,
+                        last_access_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+                        metadata TEXT
+                    )
+                ''')
+
+                # 創建索引以提高查詢效能
+                cursor.execute('''
+                    CREATE INDEX IF NOT EXISTS idx_file_hash
+                    ON ocr_cache(file_hash)
+                ''')
+                cursor.execute('''
+                    CREATE INDEX IF NOT EXISTS idx_extraction_time
+                    ON ocr_cache(extraction_time)
+                ''')
+
+                conn.commit()
+                logger.info("OCR 快取資料庫初始化完成")
+
+        except Exception as e:
+            logger.error(f"初始化 OCR 快取資料庫失敗: {e}")
+            raise
+
+    def _calculate_file_hash(self, file_data: bytes, additional_info: str = "") -> str:
+        """
+        計算檔案內容的 SHA256 雜湊值
+
+        Args:
+            file_data: 檔案二進位資料
+            additional_info: 額外資訊（如頁數、處理參數等）
+
+        Returns:
+            檔案的 SHA256 雜湊值
+        """
+        hash_input = file_data + additional_info.encode('utf-8')
+        return hashlib.sha256(hash_input).hexdigest()
+
+    def get_cached_text(self, file_data: bytes, filename: str = "",
+                       additional_info: str = "") -> Optional[str]:
+        """
+        獲取快取的 OCR 文字
+
+        Args:
+            file_data: 檔案二進位資料
+            filename: 檔案名稱
+            additional_info: 額外資訊
+
+        Returns:
+            快取的文字內容，如果不存在則返回 None
+        """
+        try:
+            file_hash = self._calculate_file_hash(file_data, additional_info)
+
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+
+                # 查詢快取
+                cursor.execute('''
+                    SELECT extracted_text, access_count
+                    FROM ocr_cache
+                    WHERE file_hash = ? AND
+                          extraction_time > datetime('now', '-{} days')
+                '''.format(self.cache_expire_days), (file_hash,))
+
+                result = cursor.fetchone()
+
+                if result:
+                    extracted_text, access_count = result
+
+                    # 更新訪問計數和時間
+                    cursor.execute('''
+                        UPDATE ocr_cache
+                        SET access_count = ?, last_access_time = CURRENT_TIMESTAMP
+                        WHERE file_hash = ?
+                    ''', (access_count + 1, file_hash))
+
+                    conn.commit()
+
+                    logger.info(f"[OCR-CACHE] 快取命中: {filename} (訪問次數: {access_count + 1})")
+                    return extracted_text
+
+                logger.debug(f"[OCR-CACHE] 快取未命中: {filename}")
+                return None
+
+        except Exception as e:
+            logger.error(f"獲取 OCR 快取失敗: {e}")
+            return None
+
+    def save_cached_text(self, file_data: bytes, extracted_text: str,
+                        filename: str = "", additional_info: str = "",
+                        metadata: Dict[str, Any] = None) -> bool:
+        """
+        儲存 OCR 文字到快取
+
+        Args:
+            file_data: 檔案二進位資料
+            extracted_text: 提取的文字
+            filename: 檔案名稱
+            additional_info: 額外資訊
+            metadata: 中繼資料
+
+        Returns:
+            是否儲存成功
+        """
+        try:
+            file_hash = self._calculate_file_hash(file_data, additional_info)
+            file_size = len(file_data)
+            metadata_json = json.dumps(metadata or {}, ensure_ascii=False)
+
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+
+                # 使用 INSERT OR REPLACE 來處理重複的雜湊值
+                cursor.execute('''
+                    INSERT OR REPLACE INTO ocr_cache
+                    (file_hash, filename, file_size, extracted_text, metadata)
+                    VALUES (?, ?, ?, ?, ?)
+                ''', (file_hash, filename, file_size, extracted_text, metadata_json))
+
+                conn.commit()
+
+                logger.info(f"[OCR-CACHE] 儲存快取成功: {filename} ({len(extracted_text)} 字元)")
+                return True
+
+        except Exception as e:
+            logger.error(f"儲存 OCR 快取失敗: {e}")
+            return False
+
+    def get_cache_stats(self) -> Dict[str, Any]:
+        """
+        獲取快取統計資訊
+
+        Returns:
+            快取統計資料
+        """
+        try:
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+
+                # 總記錄數
+                cursor.execute('SELECT COUNT(*) FROM ocr_cache')
+                total_records = cursor.fetchone()[0]
+
+                # 總訪問次數
+                cursor.execute('SELECT SUM(access_count) FROM ocr_cache')
+                total_accesses = cursor.fetchone()[0] or 0
+
+                # 快取大小
+                cursor.execute('SELECT SUM(LENGTH(extracted_text)) FROM ocr_cache')
+                cache_size_chars = cursor.fetchone()[0] or 0
+
+                # 最近 7 天的記錄數
+                cursor.execute('''
+                    SELECT COUNT(*) FROM ocr_cache
+                    WHERE extraction_time > datetime('now', '-7 days')
+                ''')
+                recent_records = cursor.fetchone()[0]
+
+                # 最常訪問的記錄
+                cursor.execute('''
+                    SELECT filename, access_count, last_access_time
+                    FROM ocr_cache
+                    ORDER BY access_count DESC
+                    LIMIT 5
+                ''')
+                top_accessed = cursor.fetchall()
+
+                return {
+                    'total_records': total_records,
+                    'total_accesses': total_accesses,
+                    'cache_size_chars': cache_size_chars,
+                    'cache_size_mb': cache_size_chars / (1024 * 1024),
+                    'recent_records_7days': recent_records,
+                    'top_accessed_files': [
+                        {
+                            'filename': row[0],
+                            'access_count': row[1],
+                            'last_access': row[2]
+                        }
+                        for row in top_accessed
+                    ],
+                    'cache_hit_potential': f"{(total_accesses - total_records) / max(total_accesses, 1) * 100:.1f}%"
+                }
+
+        except Exception as e:
+            logger.error(f"獲取快取統計失敗: {e}")
+            return {}
+
+    def clean_expired_cache(self) -> int:
+        """
+        清理過期的快取記錄
+
+        Returns:
+            清理的記錄數量
+        """
+        try:
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+
+                # 刪除過期記錄
+                cursor.execute('''
+                    DELETE FROM ocr_cache
+                    WHERE extraction_time < datetime('now', '-{} days')
+                '''.format(self.cache_expire_days))
+
+                deleted_count = cursor.rowcount
+                conn.commit()
+
+                logger.info(f"[OCR-CACHE] 清理過期快取: {deleted_count} 筆記錄")
+                return deleted_count
+
+        except Exception as e:
+            logger.error(f"清理過期快取失敗: {e}")
+            return 0
+
+    def clear_all_cache(self) -> bool:
+        """
+        清空所有快取
+
+        Returns:
+            是否成功
+        """
+        try:
+            with sqlite3.connect(self.cache_db_path) as conn:
+                cursor = conn.cursor()
+                cursor.execute('DELETE FROM ocr_cache')
+                conn.commit()
+
+                logger.info("[OCR-CACHE] 已清空所有快取")
+                return True
+
+        except Exception as e:
+            logger.error(f"清空快取失敗: {e}")
+            return False