#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
数据库管理模块
负责SQLite数据库的创建、连接和数据操作
"""

import sqlite3
import json
import uuid
from datetime import datetime, timezone, timedelta
from typing import List, Dict, Optional, Any
import logging

logger = logging.getLogger(__name__)

class DatabaseManager:
    """数据库管理器"""
    
    def __init__(self, db_path: str):
        self.db_path = db_path
        self.connection = None
        # 设置中国上海时区 (UTC+8)
        self.china_tz = timezone(timedelta(hours=8))
    
    def get_china_time(self) -> str:
        """获取中国时区的当前时间字符串"""
        return datetime.now(self.china_tz).strftime('%Y-%m-%d %H:%M:%S')
    
    def get_connection(self) -> sqlite3.Connection:
        """获取数据库连接"""
        if not self.connection:
            self.connection = sqlite3.connect(
                self.db_path, 
                check_same_thread=False,
                timeout=30.0
            )
            self.connection.row_factory = sqlite3.Row
        return self.connection
    
    def init_database(self):
        """初始化数据库表结构"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 创建患者表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS patients (
                    id TEXT PRIMARY KEY,
                    name TEXT NOT NULL,
                    gender TEXT,
                    age INTEGER,
                    birth_date TIMESTAMP,
                    nationality TEXT,
                    height REAL,
                    weight REAL,
                    phone TEXT,
                    shoe_size TEXT,
                    medical_history TEXT,
                    notes TEXT,
                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                )
            ''')
            
            # 创建检测会话表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS detection_sessions (
                    id TEXT PRIMARY KEY,
                    patient_id TEXT NOT NULL,
                    start_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    end_time TIMESTAMP,
                    duration INTEGER,
                    frequency INTEGER,
                    status TEXT DEFAULT 'created',
                    settings TEXT,
                    data_points INTEGER DEFAULT 0,
                    video_path TEXT,
                    notes TEXT,
                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    FOREIGN KEY (patient_id) REFERENCES patients (id)
                )
            ''')
            
            # 创建检测数据表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS detection_data (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    session_id TEXT NOT NULL,
                    timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    data_type TEXT NOT NULL,
                    data_value TEXT NOT NULL,
                    FOREIGN KEY (session_id) REFERENCES detection_sessions (id)
                )
            ''')
            
            # 创建分析结果表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS analysis_results (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    session_id TEXT NOT NULL,
                    analysis_type TEXT NOT NULL,
                    result_data TEXT NOT NULL,
                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    FOREIGN KEY (session_id) REFERENCES detection_sessions (id)
                )
            ''')
            
            # 创建系统设置表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS system_settings (
                    key TEXT PRIMARY KEY,
                    value TEXT NOT NULL,
                    description TEXT,
                    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                )
            ''')
            
            # 创建用户表
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS users (
                    id TEXT PRIMARY KEY,
                    name TEXT NOT NULL,
                    username TEXT UNIQUE NOT NULL,
                    password TEXT NOT NULL,
                    register_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    is_active BOOLEAN DEFAULT 0,
                    user_type TEXT DEFAULT 'user',
                    phone TEXT DEFAULT '',
                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                )
            ''')         
           
            
            # 创建索引
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_patients_name ON patients (name)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_sessions_patient ON detection_sessions (patient_id)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_sessions_time ON detection_sessions (start_time)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_data_session ON detection_data (session_id)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_data_timestamp ON detection_data (timestamp)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_users_username ON users (username)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_users_type ON users (user_type)')
            cursor.execute('CREATE INDEX IF NOT EXISTS idx_users_phone ON users (phone)')
            
            # 插入默认管理员账户（如果不存在）
            cursor.execute('SELECT COUNT(*) FROM users WHERE username = ?', ('admin',))
            admin_exists = cursor.fetchone()[0]
            
            if admin_exists == 0:
                admin_id = str(uuid.uuid4())
                # 默认密码为 admin123，明文存储
                admin_password = 'admin123'
                
                cursor.execute('''
                    INSERT INTO users (id, name, username, password, is_active, user_type)
                    VALUES (?, ?, ?, ?, ?, ?)
                ''', (admin_id, '系统管理员', 'admin', admin_password, 1, 'admin'))
                
                logger.info('创建默认管理员账户: admin/admin123')
            
            conn.commit()
            logger.info('数据库初始化完成')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'数据库初始化失败: {e}')
            raise
    
    # ==================== 患者管理 ====================
    
    def create_patient(self, patient_data: Dict[str, Any]) -> str:
        """创建患者记录"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            patient_id = str(uuid.uuid4())
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                INSERT INTO patients (
                    id, name, gender, age, birth_date, height, weight, 
                    phone, shoe_size, medical_history, notes, created_at, updated_at
                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            ''', (
                patient_id,
                patient_data.get('name'),
                patient_data.get('gender'),
                patient_data.get('age'),
                patient_data.get('birth_date'),
                patient_data.get('height'),
                patient_data.get('weight'),
                patient_data.get('phone'),
                patient_data.get('shoe_size'),
                patient_data.get('medical_history'),
                patient_data.get('notes'),
                china_time,
                china_time
            ))
            
            conn.commit()
            logger.info(f'创建患者记录: {patient_id}')
            return patient_id
            
        except Exception as e:
            conn.rollback()
            logger.error(f'创建患者记录失败: {e}')
            raise
    
    def get_patients(self, page: int = 1, size: int = 10, keyword: str = '') -> List[Dict]:
        """获取患者列表"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            offset = (page - 1) * size
            
            if keyword:
                cursor.execute('''
                    SELECT * FROM patients 
                    WHERE name LIKE ? OR phone LIKE ?
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                ''', (f'%{keyword}%', f'%{keyword}%', size, offset))
            else:
                cursor.execute('''
                    SELECT * FROM patients 
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                ''', (size, offset))
            
            rows = cursor.fetchall()
            return [dict(row) for row in rows]
            
        except Exception as e:
            logger.error(f'获取患者列表失败: {e}')
            raise
    
    def get_patients_count(self, keyword: str = '') -> int:
        """获取患者总数"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            if keyword:
                cursor.execute('''
                    SELECT COUNT(*) FROM patients 
                    WHERE name LIKE ? OR phone LIKE ?
                ''', (f'%{keyword}%', f'%{keyword}%'))
            else:
                cursor.execute('SELECT COUNT(*) FROM patients')
            
            return cursor.fetchone()[0]
            
        except Exception as e:
            logger.error(f'获取患者总数失败: {e}')
            return 0
    
    def get_patient(self, patient_id: str) -> Optional[Dict]:
        """获取单个患者信息"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('SELECT * FROM patients WHERE id = ?', (patient_id,))
            row = cursor.fetchone()
            return dict(row) if row else None
            
        except Exception as e:
            logger.error(f'获取患者信息失败: {e}')
            return None
    
    def update_patient(self, patient_id: str, patient_data: Dict[str, Any]):
        """更新患者信息"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                UPDATE patients SET 
                    name = ?, gender = ?, age = ?, birth_date = ?, height = ?, weight = ?,
                    phone = ?, shoe_size = ?, medical_history = ?, notes = ?,
                    updated_at = ?
                WHERE id = ?
            ''', (
                patient_data.get('name'),
                patient_data.get('gender'),
                patient_data.get('age'),
                patient_data.get('birth_date'),
                patient_data.get('height'),
                patient_data.get('weight'),
                patient_data.get('phone'),
                patient_data.get('shoe_size'),
                patient_data.get('medical_history'),
                patient_data.get('notes'),
                china_time,
                patient_id
            ))
            
            conn.commit()
            logger.info(f'更新患者信息: {patient_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'更新患者信息失败: {e}')
            raise
    
    def delete_patient(self, patient_id: str):
        """删除患者记录"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 删除相关的检测数据
            cursor.execute('''
                DELETE FROM detection_data 
                WHERE session_id IN (
                    SELECT id FROM detection_sessions WHERE patient_id = ?
                )
            ''', (patient_id,))
            
            # 删除相关的分析结果
            cursor.execute('''
                DELETE FROM analysis_results 
                WHERE session_id IN (
                    SELECT id FROM detection_sessions WHERE patient_id = ?
                )
            ''', (patient_id,))
            
            # 删除检测会话
            cursor.execute('DELETE FROM detection_sessions WHERE patient_id = ?', (patient_id,))
            
            # 删除患者记录
            cursor.execute('DELETE FROM patients WHERE id = ?', (patient_id,))
            
            conn.commit()
            logger.info(f'删除患者记录: {patient_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'删除患者记录失败: {e}')
            raise
    
    # ==================== 检测会话管理 ====================
    
    def create_detection_session(self, patient_id: str, settings: Dict[str, Any]) -> str:
        """创建检测会话"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            session_id = str(uuid.uuid4())
            
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                INSERT INTO detection_sessions (
                    id, patient_id, duration, frequency, settings, status, start_time, created_at
                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
            ''', (
                session_id,
                patient_id,
                settings.get('duration', 60),
                settings.get('frequency', 60),
                json.dumps(settings),
                'created',
                china_time,
                china_time
            ))
            
            conn.commit()
            logger.info(f'创建检测会话: {session_id}')
            return session_id
            
        except Exception as e:
            conn.rollback()
            logger.error(f'创建检测会话失败: {e}')
            raise
    
    def update_session_status(self, session_id: str, status: str, data_points: int = 0):
        """更新会话状态"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            if status in ['completed', 'stopped', 'error']:
                # 使用中国时区时间
                china_time = self.get_china_time()
                cursor.execute('''
                    UPDATE detection_sessions SET 
                        status = ?, data_points = ?, end_time = ?
                    WHERE id = ?
                ''', (status, data_points, china_time, session_id))
            else:
                cursor.execute('''
                    UPDATE detection_sessions SET 
                        status = ?, data_points = ?
                    WHERE id = ?
                ''', (status, data_points, session_id))
            
            conn.commit()
            logger.info(f'更新会话状态: {session_id} -> {status}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'更新会话状态失败: {e}')
            raise
    
    def update_session_duration(self, session_id: str, duration: int):
        """更新会话持续时间"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                UPDATE detection_sessions SET duration = ?
                WHERE id = ?
            ''', (duration, session_id))
            
            conn.commit()
            logger.info(f'更新会话持续时间: {session_id} -> {duration}秒')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'更新会话持续时间失败: {e}')
            raise
    
    def update_session_video_path(self, session_id: str, video_path: str):
        """更新会话视频路径"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                UPDATE detection_sessions SET video_path = ?
                WHERE id = ?
            ''', (video_path, session_id))
            
            conn.commit()
            logger.info(f'更新会话视频路径: {session_id} -> {video_path}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'更新会话视频路径失败: {e}')
            raise
    
    def get_detection_sessions(self, page: int = 1, size: int = 10, patient_id: str = None) -> List[Dict]:
        """获取检测会话列表"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            offset = (page - 1) * size
            
            if patient_id:
                cursor.execute('''
                    SELECT s.*, p.name as patient_name
                    FROM detection_sessions s
                    LEFT JOIN patients p ON s.patient_id = p.id
                    WHERE s.patient_id = ?
                    ORDER BY s.start_time DESC
                    LIMIT ? OFFSET ?
                ''', (patient_id, size, offset))
            else:
                cursor.execute('''
                    SELECT s.*, p.name as patient_name
                    FROM detection_sessions s
                    LEFT JOIN patients p ON s.patient_id = p.id
                    ORDER BY s.start_time DESC
                    LIMIT ? OFFSET ?
                ''', (size, offset))
            
            rows = cursor.fetchall()
            sessions = []
            
            for row in rows:
                session = dict(row)
                # 解析设置JSON
                if session['settings']:
                    try:
                        session['settings'] = json.loads(session['settings'])
                    except:
                        session['settings'] = {}
                sessions.append(session)
            
            return sessions
            
        except Exception as e:
            logger.error(f'获取检测会话列表失败: {e}')
            raise
    
    def get_sessions_count(self, patient_id: str = None) -> int:
        """获取会话总数"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            if patient_id:
                cursor.execute('SELECT COUNT(*) FROM detection_sessions WHERE patient_id = ?', (patient_id,))
            else:
                cursor.execute('SELECT COUNT(*) FROM detection_sessions')
            
            return cursor.fetchone()[0]
            
        except Exception as e:
            logger.error(f'获取会话总数失败: {e}')
            return 0
    
    def get_session_data(self, session_id: str) -> Optional[Dict]:
        """获取会话详细数据"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 获取会话基本信息
            cursor.execute('''
                SELECT s.*, p.name as patient_name
                FROM detection_sessions s
                LEFT JOIN patients p ON s.patient_id = p.id
                WHERE s.id = ?
            ''', (session_id,))
            
            session_row = cursor.fetchone()
            if not session_row:
                return None
            
            session = dict(session_row)
            
            # 解析设置JSON
            if session['settings']:
                try:
                    session['settings'] = json.loads(session['settings'])
                except:
                    session['settings'] = {}
            
            # 获取检测数据
            cursor.execute('''
                SELECT * FROM detection_data 
                WHERE session_id = ?
                ORDER BY timestamp
            ''', (session_id,))
            
            data_rows = cursor.fetchall()
            session['data'] = []
            
            for row in data_rows:
                data_point = dict(row)
                # 解析数据JSON
                try:
                    data_point['data_value'] = json.loads(data_point['data_value'])
                except:
                    pass
                session['data'].append(data_point)
            
            return session
            
        except Exception as e:
            logger.error(f'获取会话数据失败: {e}')
            return None
    
    # ==================== 检测数据管理 ====================
    
    def save_detection_data(self, session_id: str, data: Dict[str, Any]):
        """保存检测数据"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            # 保存不同类型的数据
            for data_type, data_value in data.items():
                cursor.execute('''
                    INSERT INTO detection_data (session_id, data_type, data_value, timestamp)
                    VALUES (?, ?, ?, ?)
                ''', (session_id, data_type, json.dumps(data_value), china_time))
            
            conn.commit()
            
        except Exception as e:
            conn.rollback()
            logger.error(f'保存检测数据失败: {e}')
            raise
    
    def get_latest_detection_data(self, session_id: str, limit: int = 10) -> List[Dict]:
        """获取最新的检测数据"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                SELECT * FROM detection_data 
                WHERE session_id = ?
                ORDER BY timestamp DESC
                LIMIT ?
            ''', (session_id, limit))
            
            rows = cursor.fetchall()
            data_points = []
            
            for row in rows:
                data_point = dict(row)
                try:
                    data_point['data_value'] = json.loads(data_point['data_value'])
                except:
                    pass
                data_points.append(data_point)
            
            return data_points
            
        except Exception as e:
            logger.error(f'获取最新检测数据失败: {e}')
            return []
    
    # ==================== 分析结果管理 ====================
    
    def save_analysis_result(self, session_id: str, analysis_result: Dict[str, Any]):
        """保存分析结果"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            for analysis_type, result_data in analysis_result.items():
                cursor.execute('''
                    INSERT INTO analysis_results (session_id, analysis_type, result_data)
                    VALUES (?, ?, ?)
                ''', (session_id, analysis_type, json.dumps(result_data)))
            
            conn.commit()
            logger.info(f'保存分析结果: {session_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'保存分析结果失败: {e}')
            raise
    
    def get_analysis_results(self, session_id: str) -> Dict[str, Any]:
        """获取分析结果"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                SELECT * FROM analysis_results 
                WHERE session_id = ?
                ORDER BY created_at DESC
            ''', (session_id,))
            
            rows = cursor.fetchall()
            results = {}
            
            for row in rows:
                analysis_type = row['analysis_type']
                try:
                    result_data = json.loads(row['result_data'])
                    results[analysis_type] = result_data
                except:
                    results[analysis_type] = row['result_data']
            
            return results
            
        except Exception as e:
            logger.error(f'获取分析结果失败: {e}')
            return {}
    
    # ==================== 系统设置管理 ====================
    
    def get_setting(self, key: str, default_value: Any = None) -> Any:
        """获取系统设置"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('SELECT value FROM system_settings WHERE key = ?', (key,))
            row = cursor.fetchone()
            
            if row:
                try:
                    return json.loads(row['value'])
                except:
                    return row['value']
            
            return default_value
            
        except Exception as e:
            logger.error(f'获取系统设置失败: {e}')
            return default_value
    
    def set_setting(self, key: str, value: Any, description: str = ''):
        """设置系统设置"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            value_str = json.dumps(value) if not isinstance(value, str) else value
            
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                INSERT OR REPLACE INTO system_settings (key, value, description, updated_at)
                VALUES (?, ?, ?, ?)
            ''', (key, value_str, description, china_time))
            
            conn.commit()
            logger.info(f'设置系统设置: {key}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'设置系统设置失败: {e}')
            raise
    
    # ==================== 用户管理 ====================
    
    def register_user(self, user_data: Dict[str, Any]) -> Dict[str, Any]:
        """用户注册"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 检查手机号是否已存在（如果提供了手机号）
            if user_data.get('phone'):
                cursor.execute('SELECT COUNT(*) FROM users WHERE phone = ?', (user_data['phone'],))
                if cursor.fetchone()[0] > 0:
                    return {
                        'success': False,
                        'message': '手机号已存在'
                    }
            
            user_id = str(uuid.uuid4())
            # 密码明文存储
            password = user_data['password']
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                INSERT INTO users (id, name, username, password, phone, is_active, user_type, register_date, created_at, updated_at)
                VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
            ''', (
                user_id,
                user_data['name'],
                user_data['username'],
                password,
                user_data.get('phone'),  # 手机号可选
                1,  # 新注册用户默认激活
                'user',
                china_time,
                china_time,
                china_time
            ))
            
            conn.commit()
            logger.info(f'用户注册成功: {user_data["username"]}')
            return {
                'success': True,
                'user_id': user_id,
                'message': '注册成功'
            }
            
        except sqlite3.IntegrityError:
            conn.rollback()
            logger.error(f'用户名已存在: {user_data["username"]}')
            return {
                'success': False,
                'message': '用户名已存在'
            }
        except Exception as e:
            conn.rollback()
            logger.error(f'用户注册失败: {e}')
            return {
                'success': False,
                'message': '注册失败'
            }
    
    def authenticate_user(self, username: str, password: str) -> Optional[Dict]:
        """用户登录验证"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                SELECT * FROM users 
                WHERE username = ? AND password = ? AND is_active = 1
            ''', (username, password))
            
            row = cursor.fetchone()
            if row:
                user = dict(row)
                # 不返回密码
                del user['password']
                logger.info(f'用户登录成功: {username}')
                return user
            else:
                logger.warning(f'用户登录失败: {username}')
                return None
                
        except Exception as e:
            logger.error(f'用户验证失败: {e}')
            return None
    
    def get_user_by_phone(self, phone: str) -> Optional[Dict]:
        """根据手机号查询用户"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('SELECT * FROM users WHERE phone = ?', (phone,))
            row = cursor.fetchone()
            if row:
                user = dict(row)
                # 不返回密码
                del user['password']
                return user
            return None
        except Exception as e:
            logger.error(f'根据手机号查询用户失败: {e}')
            return None
    
    def get_users(self, page: int = 1, size: int = 10, status: str = 'all') -> List[Dict]:
        """获取用户列表"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            offset = (page - 1) * size
            
            if status == 'pending':
                cursor.execute('''
                    SELECT id, name, username, phone, register_date, is_active, user_type, created_at
                    FROM users 
                    WHERE is_active = 0 AND user_type = 'user'
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                ''', (size, offset))
            elif status == 'active':
                cursor.execute('''
                    SELECT id, name, username, phone, register_date, is_active, user_type, created_at
                    FROM users 
                    WHERE is_active = 1
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                ''', (size, offset))
            else:
                cursor.execute('''
                    SELECT id, name, username, phone, register_date, is_active, user_type, created_at
                    FROM users 
                    ORDER BY created_at DESC
                    LIMIT ? OFFSET ?
                ''', (size, offset))
            
            rows = cursor.fetchall()
            return [dict(row) for row in rows]
            
        except Exception as e:
            logger.error(f'获取用户列表失败: {e}')
            return []
    
    def get_users_count(self, status: str = 'all') -> int:
        """获取用户总数"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            if status == 'pending':
                cursor.execute('SELECT COUNT(*) FROM users WHERE is_active = 0 AND user_type = "user"')
            elif status == 'active':
                cursor.execute('SELECT COUNT(*) FROM users WHERE is_active = 1')
            else:
                cursor.execute('SELECT COUNT(*) FROM users')
            
            return cursor.fetchone()[0]
            
        except Exception as e:
            logger.error(f'获取用户总数失败: {e}')
            return 0
    
    def approve_user(self, user_id: str, approved: bool = True):
        """审核用户"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 使用中国时区时间
            china_time = self.get_china_time()
            
            cursor.execute('''
                UPDATE users SET 
                    is_active = ?, 
                    updated_at = ?
                WHERE id = ?
            ''', (1 if approved else 0, china_time, user_id))
            
            conn.commit()
            status = '通过' if approved else '拒绝'
            logger.info(f'用户审核{status}: {user_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'用户审核失败: {e}')
            raise
    
    def get_user(self, user_id: str) -> Optional[Dict]:
        """获取单个用户信息"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('''
                SELECT id, name, username, phone, register_date, is_active, user_type, created_at, updated_at
                FROM users WHERE id = ?
            ''', (user_id,))
            
            row = cursor.fetchone()
            return dict(row) if row else None
            
        except Exception as e:
            logger.error(f'获取用户信息失败: {e}')
            return None
    
    def update_user(self, user_id: str, user_data: Dict[str, Any]):
        """更新用户信息"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            # 密码明文存储，无需加密处理
            
            # 构建更新语句
            fields = []
            values = []
            
            for key, value in user_data.items():
                if key in ['name', 'username', 'password', 'is_active', 'user_type','phone']:
                    fields.append(f'{key} = ?')
                    values.append(value)
            
            if fields:
                # 使用中国时区时间
                china_time = self.get_china_time()
                fields.append('updated_at = ?')
                values.append(china_time)
                values.append(user_id)
                
                sql = f"UPDATE users SET {', '.join(fields)} WHERE id = ?"
                cursor.execute(sql, values)
                
                conn.commit()
                logger.info(f'更新用户信息: {user_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'更新用户信息失败: {e}')
            raise
    
    def delete_user(self, user_id: str):
        """删除用户"""
        conn = self.get_connection()
        cursor = conn.cursor()
        
        try:
            cursor.execute('DELETE FROM users WHERE id = ?', (user_id,))
            conn.commit()
            logger.info(f'删除用户: {user_id}')
            
        except Exception as e:
            conn.rollback()
            logger.error(f'删除用户失败: {e}')
            raise
    
    def close(self):
        """关闭数据库连接"""
        if self.connection:
            self.connection.close()
            self.connection = None
            logger.info('数据库连接已关闭')