backup

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 +1,302 @@
+#!/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):
+        self.base_url = current_app.config.get('DIFY_API_BASE_URL', '')
+        self.api_key = current_app.config.get('DIFY_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.base_url or not self.api_key:
+            logger.warning("Dify 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) -> Dict[str, Any]:
+        """發送 HTTP 請求到 Dify API"""
+        
+        if not self.base_url or not self.api_key:
+            raise APIError("Dify API 未配置完整")
+        
+        url = f"{self.base_url.rstrip('/')}/{endpoint.lstrip('/')}"
+        
+        headers = {
+            'Authorization': f'Bearer {self.api_key}',
+            'Content-Type': 'application/json',
+            'User-Agent': 'PANJIT-Document-Translator/1.0'
+        }
+        
+        # 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)
+                else:
+                    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) -> 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
+        }
+        
+        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,
+                '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('base_url:'):
+                        base_url = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_API_BASE_URL'] = base_url
+                    elif line.startswith('api:'):
+                        api_key = line.split(':', 1)[1].strip()
+                        current_app.config['DIFY_API_KEY'] = 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 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
+        base_url = app.config.get('DIFY_API_BASE_URL')
+        api_key = app.config.get('DIFY_API_KEY')
+        
+        if base_url and api_key:
+            logger.info("Dify API configuration loaded successfully")
+        else:
+            logger.warning("Dify API configuration is incomplete")
+            logger.warning(f"Base URL: {'✓' if base_url else '✗'}")
+            logger.warning(f"API Key: {'✓' if 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/notification_service.py

@@ -0,0 +1,645 @@
+#!/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"""
+        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}")
+            
+            # 觸發 WebSocket 推送
+            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
+        
+        Args:
+            notification: 通知對象
+        """
+        try:
+            from app.websocket import send_notification_to_user
+            send_notification_to_user(notification.user_id, notification.to_dict())
+        except Exception as e:
+            logger.error(f"WebSocket 推送通知失敗: {e}")
+    
+    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