ai-chat-app/backend/app.py

#!/usr/bin/env python3
"""
AI Chat App - 后台管理服务
端口: 19020 (与前端同一端口)
"""

from flask import Flask, jsonify, request, send_from_directory
from flask_cors import CORS
import os
import json
import sqlite3
from datetime import datetime
import hashlib

app = Flask(__name__, static_folder='../www')
CORS(app)

# 数据库路径
DB_PATH = os.path.join(os.path.dirname(__file__), 'data.db')

# 管理员账户（默认）
ADMIN_USERNAME = 'admin'
ADMIN_PASSWORD_HASH = hashlib.sha256('admin123'.encode()).hexdigest()


def get_db():
    """获取数据库连接"""
    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row
    return conn


def init_db():
    """初始化数据库"""
    conn = get_db()
    cursor = conn.cursor()
    
    # 大模型接口配置表
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS llm_configs (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            name TEXT NOT NULL,
            provider TEXT NOT NULL,
            api_url TEXT NOT NULL,
            api_key TEXT NOT NULL,
            model TEXT NOT NULL,
            max_tokens INTEGER DEFAULT 2048,
            temperature REAL DEFAULT 0.7,
            is_default INTEGER DEFAULT 0,
            is_active INTEGER DEFAULT 1,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    
    # 智能体配置表
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS agents (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            agent_id TEXT NOT NULL UNIQUE,
            name TEXT NOT NULL,
            avatar TEXT DEFAULT '🤖',
            category TEXT NOT NULL,
            description TEXT,
            system_prompt TEXT NOT NULL,
            llm_config_id INTEGER,
            temperature REAL DEFAULT 0.7,
            max_tokens INTEGER DEFAULT 2048,
            enable_search INTEGER DEFAULT 0,
            tags TEXT,
            heat INTEGER DEFAULT 0,
            is_active INTEGER DEFAULT 1,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (llm_config_id) REFERENCES llm_configs(id)
        )
    ''')
    
    # 搜索配置表（改为工具配置）
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS tool_configs (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            tool_id TEXT NOT NULL UNIQUE,
            name TEXT NOT NULL,
            type TEXT NOT NULL,
            provider TEXT NOT NULL,
            api_url TEXT NOT NULL,
            api_key TEXT,
            config_json TEXT,
            max_results INTEGER DEFAULT 10,
            is_default INTEGER DEFAULT 0,
            is_active INTEGER DEFAULT 1,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    
    # 对话配置表
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS chat_configs (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            config_id TEXT NOT NULL UNIQUE,
            name TEXT NOT NULL,
            llm_config_id INTEGER,
            enable_tools TEXT,
            max_history INTEGER DEFAULT 20,
            temperature REAL DEFAULT 0.7,
            system_prompt TEXT,
            is_default INTEGER DEFAULT 0,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (llm_config_id) REFERENCES llm_configs(id)
        )
    ''')
    
    # 系统配置表
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS system_configs (
            key TEXT PRIMARY KEY,
            value TEXT,
            description TEXT,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    
    # 统计日志表
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS stats_logs (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            log_type TEXT NOT NULL,
            log_key TEXT NOT NULL,
            log_value INTEGER DEFAULT 1,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    
    # 用户表（后台管理）
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS admin_users (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            username TEXT NOT NULL UNIQUE,
            password_hash TEXT NOT NULL,
            role TEXT DEFAULT 'admin',
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        )
    ''')
    
    # 初始化默认大模型配置
    cursor.execute('SELECT COUNT(*) FROM llm_configs')
    if cursor.fetchone()[0] == 0:
        cursor.execute('''
            INSERT INTO llm_configs (name, provider, api_url, api_key, model, is_default)
            VALUES ('智谱GLM', 'zhipu', 'https://open.bigmodel.cn/api/paas/v4/chat/completions', 
                    '2259e33a1357460abe17919aaf81e73d.K44a8LPQTmFM5PKm', 'glm-4.5-air', 1)
        ''')
    
    # 初始化默认工具配置（搜索工具）
    cursor.execute('SELECT COUNT(*) FROM tool_configs')
    if cursor.fetchone()[0] == 0:
        cursor.execute('''
            INSERT INTO tool_configs (tool_id, name, type, provider, api_url, api_key, max_results, is_default)
            VALUES ('search', '联网搜索', 'search', 'tavily', 'https://api.tavily.com/search', 
                    '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', 10, 1)
        ''')
    
    # 初始化默认对话配置
    cursor.execute('SELECT COUNT(*) FROM chat_configs')
    if cursor.fetchone()[0] == 0:
        cursor.execute('''
            INSERT INTO chat_configs (config_id, name, llm_config_id, enable_tools, is_default)
            VALUES ('default', '默认对话配置', 1, 'search', 1)
        ''')
    
    # 初始化默认智能体
    cursor.execute('SELECT COUNT(*) FROM agents')
    if cursor.fetchone()[0] == 0:
        default_agents = [
            ('assistant', '通用助手', '🤖', 'hot', '能回答各类问题，帮助写作、分析、解答疑惑', '你是一个智能助手，能够回答各类问题，帮助用户解决问题。', 9500),
            ('writer', '写作助手', '✍️', 'hot', '专注于文章写作、文案创作、内容润色', '你是一个专业的写作助手，擅长各类文章写作、文案创作和内容润色。', 8800),
            ('coder', '编程助手', '👨‍💻', 'hot', '精通编程语言，解答技术问题，生成代码', '你是一个专业的编程助手，精通各类编程语言，能够解答技术问题并生成高质量代码。', 8500),
            ('translator', '翻译助手', '🌐', 'hot', '多语言翻译，精准表达，文化适配', '你是一个专业的翻译助手，精通多语言翻译，能够精准表达并适配文化差异。', 7200),
            ('work', '工作助手', '💼', 'work', '职场问题解答，工作效率提升', '你是一个工作助手，帮助解决职场问题，提升工作效率。', 5000),
            ('ppt', 'PPT助手', '📊', 'work', 'PPT内容生成，结构优化，设计建议', '你是一个PPT助手，擅长PPT内容生成、结构优化和设计建议。', 4500),
            ('excel', 'Excel助手', '📈', 'work', 'Excel公式、数据分析、表格优化', '你是一个Excel助手，精通Excel公式、数据分析和表格优化。', 4000),
            ('teacher', '学习助手', '📚', 'study', '知识讲解，学习方法，考试辅导', '你是一个学习助手，擅长知识讲解、学习方法指导和考试辅导。', 5500),
            ('english', '英语助手', '🔤', 'study', '英语学习，语法纠正，口语练习', '你是一个英语助手，帮助英语学习、语法纠正和口语练习。', 5000),
            ('math', '数学助手', '🔢', 'study', '数学解题，公式推导，概念讲解', '你是一个数学助手，擅长数学解题、公式推导和概念讲解。', 4500),
            ('health', '健康助手', '🏥', 'life', '健康咨询，养生建议，运动指导', '你是一个健康助手，提供健康咨询、养生建议和运动指导。', 3500),
            ('travel', '旅行助手', '✈️', 'life', '旅行规划，景点推荐，美食指南', '你是一个旅行助手，擅长旅行规划、景点推荐和美食指南。', 3200),
            ('food', '美食助手', '🍳', 'life', '菜谱推荐，烹饪技巧，营养搭配', '你是一个美食助手，提供菜谱推荐、烹饪技巧和营养搭配建议。', 3000),
        ]
        for agent in default_agents:
            cursor.execute('''
                INSERT INTO agents (agent_id, name, avatar, category, description, system_prompt, heat)
                VALUES (?, ?, ?, ?, ?, ?, ?)
            ''', agent)
    
    # 初始化系统配置
    cursor.execute('SELECT COUNT(*) FROM system_configs')
    if cursor.fetchone()[0] == 0:
        default_configs = [
            ('app_name', 'AI助手', '应用名称'),
            ('app_version', '3.5.1', '应用版本'),
            ('llm_provider', 'zhipu', '默认大模型提供商'),
            ('enable_search', 'true', '是否启用联网搜索'),
            ('guest_chat_sessions', '1', '游客每日对话会话限制'),
            ('guest_chat_messages', '20', '游客每日对话消息限制'),
            ('guest_agent_messages', '20', '游客每日智能体消息限制'),
            ('admin_password', 'admin123', '管理员密码'),
        ]
        for key, value, desc in default_configs:
            cursor.execute('INSERT INTO system_configs (key, value, description) VALUES (?, ?, ?)', (key, value, desc))
    
    # 初始化管理员账户
    cursor.execute('SELECT COUNT(*) FROM admin_users')
    if cursor.fetchone()[0] == 0:
        cursor.execute('INSERT INTO admin_users (username, password_hash) VALUES (?, ?)', 
                       (ADMIN_USERNAME, ADMIN_PASSWORD_HASH))
    
    conn.commit()
    conn.close()


# ==================== 前端静态文件服务 ====================

@app.route('/')
def index():
    """前端首页"""
    return send_from_directory(app.static_folder, 'index.html')


@app.route('/admin')
def admin():
    """后台管理页面"""
    return send_from_directory(app.static_folder, 'admin.html')


@app.route('/admin/<path:path>')
def admin_static(path):
    """后台管理静态文件"""
    return send_from_directory(app.static_folder, path)


@app.route('/<path:path>')
def static_files(path):
    """前端静态文件"""
    return send_from_directory(app.static_folder, path)


# ==================== 后台管理 API ====================

# 管理员登录验证
def check_admin_auth():
    """检查管理员权限"""
    auth = request.authorization
    if not auth:
        return False
    password_hash = hashlib.sha256(auth.password.encode()).hexdigest()
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM admin_users WHERE username = ? AND password_hash = ?', 
                   (auth.username, password_hash))
    user = cursor.fetchone()
    conn.close()
    return user is not None


@app.route('/api/admin/login', methods=['POST'])
def admin_login():
    """管理员登录"""
    data = request.json
    username = data.get('username')
    password = data.get('password')
    
    if not username or not password:
        return jsonify({'error': '请输入用户名和密码'}), 400
    
    password_hash = hashlib.sha256(password.encode()).hexdigest()
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM admin_users WHERE username = ? AND password_hash = ?', 
                   (username, password_hash))
    user = cursor.fetchone()
    conn.close()
    
    if user:
        return jsonify({'success': True, 'message': '登录成功'})
    else:
        return jsonify({'error': '用户名或密码错误'}), 401


# ==================== 大模型接口管理 ====================

@app.route('/api/admin/llm', methods=['GET'])
def get_llm_configs():
    """获取所有大模型配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM llm_configs ORDER BY is_default DESC, created_at DESC')
    configs = [dict(row) for row in cursor.fetchall()]
    conn.close()
    return jsonify(configs)


@app.route('/api/admin/llm', methods=['POST'])
def add_llm_config():
    """添加大模型配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        INSERT INTO llm_configs (name, provider, api_url, api_key, model, max_tokens, temperature)
        VALUES (?, ?, ?, ?, ?, ?, ?)
    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
          data['model'], data.get('max_tokens', 2048), data.get('temperature', 0.7)))
    conn.commit()
    config_id = cursor.lastrowid
    conn.close()
    return jsonify({'success': True, 'id': config_id})


@app.route('/api/admin/llm/<int:id>', methods=['PUT'])
def update_llm_config(id):
    """更新大模型配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        UPDATE llm_configs SET name=?, provider=?, api_url=?, api_key=?, model=?, 
        max_tokens=?, temperature=?, updated_at=CURRENT_TIMESTAMP WHERE id=?
    ''', (data['name'], data['provider'], data['api_url'], data['api_key'], 
          data['model'], data.get('max_tokens', 2048), data.get('temperature', 0.7), id))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/llm/<int:id>', methods=['DELETE'])
def delete_llm_config(id):
    """删除大模型配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('DELETE FROM llm_configs WHERE id=?', (id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/llm/<int:id>/default', methods=['POST'])
def set_default_llm(id):
    """设置默认大模型"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('UPDATE llm_configs SET is_default=0')
    cursor.execute('UPDATE llm_configs SET is_default=1 WHERE id=?', (id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 智能体管理 ====================

@app.route('/api/admin/agents', methods=['GET'])
def get_agents():
    """获取所有智能体"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM agents ORDER BY category, heat DESC')
    agents = [dict(row) for row in cursor.fetchall()]
    conn.close()
    return jsonify(agents)


@app.route('/api/admin/agents', methods=['POST'])
def add_agent():
    """添加智能体"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        INSERT INTO agents (agent_id, name, avatar, category, description, system_prompt, 
        llm_config_id, temperature, max_tokens, enable_search, tags, heat)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    ''', (data['agent_id'], data['name'], data.get('avatar', '🤖'), data['category'], 
          data.get('description', ''), data['system_prompt'], data.get('llm_config_id'),
          data.get('temperature', 0.7), data.get('max_tokens', 2048), 
          data.get('enable_search', 0), data.get('tags', ''), data.get('heat', 0)))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/agents/<agent_id>', methods=['PUT'])
def update_agent(agent_id):
    """更新智能体"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        UPDATE agents SET name=?, avatar=?, category=?, description=?, system_prompt=?, 
        llm_config_id=?, temperature=?, max_tokens=?, enable_search=?, tags=?, heat=?, 
        updated_at=CURRENT_TIMESTAMP WHERE agent_id=?
    ''', (data['name'], data.get('avatar', '🤖'), data['category'], 
          data.get('description', ''), data['system_prompt'], data.get('llm_config_id'),
          data.get('temperature', 0.7), data.get('max_tokens', 2048), 
          data.get('enable_search', 0), data.get('tags', ''), data.get('heat', 0), agent_id))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/agents/<agent_id>', methods=['DELETE'])
def delete_agent(agent_id):
    """删除智能体"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('DELETE FROM agents WHERE agent_id=?', (agent_id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 对话配置管理 ====================

@app.route('/api/admin/chat', methods=['GET'])
def get_chat_configs():
    """获取对话配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM chat_configs ORDER BY is_default DESC')
    configs = [dict(row) for row in cursor.fetchall()]
    conn.close()
    return jsonify(configs)


@app.route('/api/admin/chat', methods=['POST'])
def add_chat_config():
    """添加对话配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        INSERT INTO chat_configs (config_id, name, llm_config_id, enable_tools, max_history, temperature, system_prompt)
        VALUES (?, ?, ?, ?, ?, ?, ?)
    ''', (data['config_id'], data['name'], data.get('llm_config_id'), data.get('enable_tools', ''),
          data.get('max_history', 20), data.get('temperature', 0.7), data.get('system_prompt', '')))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/chat/<config_id>', methods=['PUT'])
def update_chat_config(config_id):
    """更新对话配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        UPDATE chat_configs SET name=?, llm_config_id=?, enable_tools=?, max_history=?, 
        temperature=?, system_prompt=?, updated_at=CURRENT_TIMESTAMP WHERE config_id=?
    ''', (data['name'], data.get('llm_config_id'), data.get('enable_tools', ''),
          data.get('max_history', 20), data.get('temperature', 0.7), 
          data.get('system_prompt', ''), config_id))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/chat/<config_id>', methods=['DELETE'])
def delete_chat_config(config_id):
    """删除对话配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('DELETE FROM chat_configs WHERE config_id=?', (config_id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/chat/<config_id>/default', methods=['POST'])
def set_default_chat(config_id):
    """设置默认对话配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('UPDATE chat_configs SET is_default=0')
    cursor.execute('UPDATE chat_configs SET is_default=1 WHERE config_id=?', (config_id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 工具配置管理 ====================

@app.route('/api/admin/tools', methods=['GET'])
def get_tool_configs():
    """获取工具配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM tool_configs ORDER BY is_default DESC, type')
    tools = [dict(row) for row in cursor.fetchall()]
    conn.close()
    return jsonify(tools)


@app.route('/api/admin/tools', methods=['POST'])
def add_tool_config():
    """添加工具配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        INSERT INTO tool_configs (tool_id, name, type, provider, api_url, api_key, config_json, max_results)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?)
    ''', (data['tool_id'], data['name'], data['type'], data['provider'], 
          data['api_url'], data.get('api_key', ''), data.get('config_json', ''),
          data.get('max_results', 10)))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/tools/<tool_id>', methods=['PUT'])
def update_tool_config(tool_id):
    """更新工具配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('''
        UPDATE tool_configs SET name=?, type=?, provider=?, api_url=?, api_key=?, 
        config_json=?, max_results=?, updated_at=CURRENT_TIMESTAMP WHERE tool_id=?
    ''', (data['name'], data['type'], data['provider'], data['api_url'], 
          data.get('api_key', ''), data.get('config_json', ''),
          data.get('max_results', 10), tool_id))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/tools/<tool_id>', methods=['DELETE'])
def delete_tool_config(tool_id):
    """删除工具配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('DELETE FROM tool_configs WHERE tool_id=?', (tool_id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/admin/tools/<tool_id>/default', methods=['POST'])
def set_default_tool(tool_id):
    """设置默认工具"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('UPDATE tool_configs SET is_default=0 WHERE type=(SELECT type FROM tool_configs WHERE tool_id=?)', (tool_id,))
    cursor.execute('UPDATE tool_configs SET is_default=1 WHERE tool_id=?', (tool_id,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 系统配置管理 ====================

@app.route('/api/admin/system', methods=['GET'])
def get_system_configs():
    """获取系统配置"""
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM system_configs')
    configs = {row['key']: {'value': row['value'], 'description': row['description']} 
               for row in cursor.fetchall()}
    conn.close()
    return jsonify(configs)


@app.route('/api/admin/system', methods=['POST'])
def update_system_config():
    """更新系统配置"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    for key, value in data.items():
        cursor.execute('''
            UPDATE system_configs SET value=?, updated_at=CURRENT_TIMESTAMP WHERE key=?
        ''', (value, key))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 统计信息 ====================

@app.route('/api/admin/stats', methods=['GET'])
def get_stats():
    """获取统计信息"""
    conn = get_db()
    cursor = conn.cursor()
    
    # 今日统计
    today = datetime.now().strftime('%Y-%m-%d')
    
    # 各类型统计
    stats = {}
    
    # LLM调用统计
    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="llm_call"')
    stats['llm_total_calls'] = cursor.fetchone()[0] or 0
    
    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="llm_call" AND created_at >= ?', (today,))
    stats['llm_today_calls'] = cursor.fetchone()[0] or 0
    
    # 搜索统计
    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="search_call"')
    stats['search_total_calls'] = cursor.fetchone()[0] or 0
    
    cursor.execute('SELECT SUM(log_value) FROM stats_logs WHERE log_type="search_call" AND created_at >= ?', (today,))
    stats['search_today_calls'] = cursor.fetchone()[0] or 0
    
    # 智能体使用统计
    cursor.execute('''
        SELECT log_key, SUM(log_value) as count FROM stats_logs 
        WHERE log_type="agent_use" GROUP BY log_key ORDER BY count DESC LIMIT 10
    ''')
    stats['agent_usage'] = [dict(row) for row in cursor.fetchall()]
    
    # 用户统计
    cursor.execute('SELECT COUNT(*) FROM stats_logs WHERE log_type="user_register"')
    stats['total_users'] = cursor.fetchone()[0] or 0
    
    # 智能体数量
    cursor.execute('SELECT COUNT(*) FROM agents WHERE is_active=1')
    stats['agent_count'] = cursor.fetchone()[0]
    
    # LLM配置数量
    cursor.execute('SELECT COUNT(*) FROM llm_configs WHERE is_active=1')
    stats['llm_count'] = cursor.fetchone()[0]
    
    conn.close()
    return jsonify(stats)


@app.route('/api/admin/stats/log', methods=['POST'])
def log_stats():
    """记录统计日志"""
    data = request.json
    conn = get_db()
    cursor = conn.cursor()
    cursor.execute('INSERT INTO stats_logs (log_type, log_key, log_value) VALUES (?, ?, ?)',
                   (data['type'], data.get('key', ''), data.get('value', 1)))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ==================== 前端配置获取 ====================

@app.route('/api/config', methods=['GET'])
def get_frontend_config():
    """获取前端使用的配置"""
    conn = get_db()
    cursor = conn.cursor()
    
    # 获取默认LLM配置
    cursor.execute('SELECT * FROM llm_configs WHERE is_default=1 AND is_active=1 LIMIT 1')
    llm = cursor.fetchone()
    
    # 获取默认工具配置（搜索等）
    cursor.execute('SELECT * FROM tool_configs WHERE is_default=1 AND is_active=1')
    tools = [dict(row) for row in cursor.fetchall()]
    
    # 获取所有智能体
    cursor.execute('SELECT agent_id, name, avatar, category, description, system_prompt, heat, enable_search FROM agents WHERE is_active=1')
    agents = [dict(row) for row in cursor.fetchall()]
    
    # 获取默认对话配置
    cursor.execute('SELECT * FROM chat_configs WHERE is_default=1 LIMIT 1')
    chat_config = cursor.fetchone()
    
    # 获取系统配置
    cursor.execute('SELECT key, value FROM system_configs')
    system = {row['key']: row['value'] for row in cursor.fetchall()}
    
    conn.close()
    
    config = {
        'llm': dict(llm) if llm else None,
        'tools': tools,
        'agents': agents,
        'chat_config': dict(chat_config) if chat_config else None,
        'system': {
            'appName': system.get('app_name', 'AI助手'),
            'version': system.get('app_version', '3.6.0'),
            'enableSearch': system.get('enable_search', 'true') == 'true',
            'guestLimits': {
                'chatSessions': int(system.get('guest_chat_sessions', '1')),
                'chatMessages': int(system.get('guest_chat_messages', '20')),
                'agentMessages': int(system.get('guest_agent_messages', '20')),
            }
        }
    }
    
    return jsonify(config)


# ==================== 启动 ====================

if __name__ == '__main__':
    # 初始化数据库
    init_db()
    
    # 启动服务
    print('🚀 AI Chat App Backend started on http://localhost:19021')
    print('📊 Admin Panel: http://localhost:19021/admin')
    print('👤 Default admin: admin / admin123')
    
    app.run(host='0.0.0.0', port=19021, debug=True)