#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
身体平衡评估系统 - 主启动脚本

这个脚本负责启动整个应用程序，包括后端服务和前端界面。
支持开发模式和生产模式。
"""

import os
import sys
import time
import signal
import subprocess
import threading
import webbrowser
import logging
from pathlib import Path

# 添加项目根目录到Python路径
project_root = Path(__file__).parent.parent
sys.path.insert(0, str(project_root))
sys.path.insert(0, str(project_root / 'backend'))

from utils import Config, Logger

class ApplicationLauncher:
    """应用程序启动器"""
    
    def __init__(self):
        self.config = Config()
        # 设置日志
        Logger.setup_logging('INFO', 'logs/app.log')
        self.logger = logging.getLogger('main')
        self.backend_process = None
        self.frontend_process = None
        self.running = False
        
        # 设置信号处理
        signal.signal(signal.SIGINT, self._signal_handler)
        signal.signal(signal.SIGTERM, self._signal_handler)
        
    def _signal_handler(self, signum, frame):
        """信号处理器"""
        self.logger.info(f"接收到信号 {signum}，正在关闭应用程序...")
        self.stop()
        
    def check_dependencies(self):
        """检查依赖项"""
        self.logger.info("检查系统依赖项...")
        
        # 检查Python版本
        if sys.version_info < (3, 8):
            self.logger.error("需要Python 3.8或更高版本")
            return False
            
        # 检查必要的Python包
        required_packages = [
            'flask', 'flask_cors', 'flask_socketio',
            'numpy', 'pandas', 'opencv-python',
            'sqlite3'
        ]
        
        missing_packages = []
        for package in required_packages:
            try:
                if package == 'sqlite3':
                    import sqlite3
                elif package == 'opencv-python':
                    import cv2
                elif package == 'flask_cors':
                    import flask_cors
                elif package == 'flask_socketio':
                    import flask_socketio
                else:
                    __import__(package)
            except ImportError:
                missing_packages.append(package)
                
        if missing_packages:
            self.logger.error(f"缺少必要的Python包: {', '.join(missing_packages)}")
            self.logger.info("请运行: pip install -r backend/requirements.txt")
            return False
            
        # 检查Node.js和npm（用于前端开发）
        if self.config.get('APP', 'mode', 'development') == 'development':
            try:
                result = subprocess.run(['node', '--version'], 
                                      capture_output=True, text=True)
                if result.returncode != 0:
                    self.logger.warning("未找到Node.js，将跳过前端开发服务器")
                else:
                    self.logger.info(f"Node.js版本: {result.stdout.strip()}")
            except FileNotFoundError:
                self.logger.warning("未找到Node.js，将跳过前端开发服务器")
                
        self.logger.info("依赖项检查完成")
        return True
        
    def setup_directories(self):
        """设置必要的目录"""
        self.logger.info("设置应用程序目录...")
        
        directories = [
            'data',
            'data/patients',
            'data/sessions',
            'data/exports',
            'data/backups',
            'logs',
            'temp'
        ]
        
        for directory in directories:
            dir_path = project_root / directory
            dir_path.mkdir(parents=True, exist_ok=True)
            self.logger.debug(f"创建目录: {dir_path}")
            
        self.logger.info("目录设置完成")
        
    def start_backend(self):
        """启动后端服务"""
        self.logger.info("启动后端服务...")
        
        backend_script = project_root / 'backend' / 'app.py'
        if not backend_script.exists():
            self.logger.error(f"后端脚本不存在: {backend_script}")
            return False
            
        try:
            # 设置环境变量
            env = os.environ.copy()
            env['PYTHONPATH'] = str(project_root)
            env['FLASK_APP'] = str(backend_script)
            
            if self.config.get('APP', 'mode', 'development') == 'development':
                env['FLASK_ENV'] = 'development'
                env['FLASK_DEBUG'] = '1'
            else:
                env['FLASK_ENV'] = 'production'
                env['FLASK_DEBUG'] = '0'
                
            # 启动后端进程
            cmd = [
                sys.executable, 
                str(backend_script),
                '--host', self.config.get('SERVER', 'host', '127.0.0.1'),
                '--port', self.config.get('SERVER', 'port', '5000')
            ]
            
            self.backend_process = subprocess.Popen(
                cmd,
                env=env,
                cwd=str(project_root),
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                text=True
            )
            
            self.logger.info(f"后端服务已启动 (PID: {self.backend_process.pid})")
            
            # 等待后端服务启动
            self._wait_for_backend()
            return True
            
        except Exception as e:
            self.logger.error(f"启动后端服务失败: {e}")
            return False
            
    def _wait_for_backend(self, timeout=30):
        """等待后端服务启动"""
        import requests
        
        backend_url = f"http://{self.config.get('SERVER', 'host', '127.0.0.1')}:{self.config.get('SERVER', 'port', '5000')}"
        health_url = f"{backend_url}/api/health"
        
        self.logger.info("等待后端服务启动...")
        
        start_time = time.time()
        while time.time() - start_time < timeout:
            try:
                response = requests.get(health_url, timeout=2)
                if response.status_code == 200:
                    self.logger.info("后端服务已就绪")
                    return True
            except requests.exceptions.RequestException:
                pass
                
            time.sleep(1)
            
        self.logger.warning("后端服务启动超时")
        return False
        
    def start_frontend_dev(self):
        """启动前端开发服务器"""
        if self.config.get('APP', 'mode', 'development') != 'development':
            return True
            
        self.logger.info("启动前端开发服务器...")
        
        frontend_dir = project_root / 'frontend' / 'src' / 'renderer'
        if not frontend_dir.exists():
            self.logger.warning("前端目录不存在，跳过前端开发服务器")
            return True
            
        package_json = frontend_dir / 'package.json'
        if not package_json.exists():
            self.logger.warning("package.json不存在，跳过前端开发服务器")
            return True
            
        try:
            # 检查是否已安装依赖
            node_modules = frontend_dir / 'node_modules'
            if not node_modules.exists():
                self.logger.info("安装前端依赖...")
                install_process = subprocess.run(
                    ['npm', 'install'],
                    cwd=str(frontend_dir),
                    capture_output=True,
                    text=True,
                    shell=True
                )
                
                if install_process.returncode != 0:
                    self.logger.error(f"安装前端依赖失败: {install_process.stderr}")
                    return False
                    
            # 启动开发服务器
            self.frontend_process = subprocess.Popen(
                ['npm', 'run', 'dev'],
                cwd=str(frontend_dir),
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                text=True,
                shell=True
            )
            
            self.logger.info(f"前端开发服务器已启动 (PID: {self.frontend_process.pid})")
            return True
            
        except Exception as e:
            self.logger.error(f"启动前端开发服务器失败: {e}")
            return False
            
    def open_browser(self):
        """打开浏览器"""
        if not self.config.getboolean('APP', 'auto_open_browser', True):
            return
            
        if self.config.get('APP', 'mode', 'development') == 'development':
            # 开发模式下打开前端开发服务器
            url = "http://localhost:3000"  # Vite配置端口
        else:
            # 生产模式下打开后端服务
            url = f"http://{self.config.get('SERVER', 'host', '127.0.0.1')}:{self.config.get('SERVER', 'port', '5000')}"
            
        def delayed_open():
            time.sleep(3)  # 等待服务启动
            try:
                webbrowser.open(url)
                self.logger.info(f"已打开浏览器: {url}")
            except Exception as e:
                self.logger.warning(f"打开浏览器失败: {e}")
                
        threading.Thread(target=delayed_open, daemon=True).start()
        
    def monitor_processes(self):
        """监控子进程"""
        while self.running:
            try:
                # 检查后端进程
                if self.backend_process and self.backend_process.poll() is not None:
                    self.logger.error("后端进程意外退出")
                    if self.backend_process.returncode != 0:
                        stderr = self.backend_process.stderr.read()
                        if stderr:
                            self.logger.error(f"后端错误: {stderr}")
                    self.running = False
                    break
                    
                # 检查前端进程
                if (self.frontend_process and 
                    self.frontend_process.poll() is not None and
                    self.config.get('APP', 'mode', 'development') == 'development'):
                    self.logger.warning("前端开发服务器意外退出")
                    
                time.sleep(5)
                
            except Exception as e:
                self.logger.error(f"进程监控错误: {e}")
                break
                
    def start(self):
        """启动应用程序"""
        self.logger.info("=" * 50)
        self.logger.info("身体平衡评估系统启动中...")
        self.logger.info(f"模式: {self.config.get('APP', 'mode', 'development')}")
        self.logger.info("=" * 50)
        
        # 检查依赖项
        if not self.check_dependencies():
            return False
            
        # 设置目录
        self.setup_directories()
        
        # 启动后端服务
        if not self.start_backend():
            return False
            
        # 启动前端开发服务器（仅开发模式）
        if not self.start_frontend_dev():
            self.logger.warning("前端开发服务器启动失败，但继续运行")
            
        self.running = True
        
        # 打开浏览器
        self.open_browser()
        
        # 启动进程监控
        monitor_thread = threading.Thread(target=self.monitor_processes, daemon=True)
        monitor_thread.start()
        
        self.logger.info("应用程序启动完成")
        self.logger.info(f"后端服务: http://{self.config.get('SERVER', 'host', '127.0.0.1')}:{self.config.get('SERVER', 'port', '5000')}")
        
        if self.config.get('APP', 'mode', 'development') == 'development':
            self.logger.info("前端开发服务器: http://localhost:3000")
            
        self.logger.info("按 Ctrl+C 退出应用程序")
        
        # 主循环
        try:
            while self.running:
                time.sleep(1)
        except KeyboardInterrupt:
            self.logger.info("接收到中断信号")
            
        self.stop()
        return True
        
    def stop(self):
        """停止应用程序"""
        if not self.running:
            return
            
        self.logger.info("正在停止应用程序...")
        self.running = False
        
        # 停止前端进程
        if self.frontend_process:
            try:
                self.frontend_process.terminate()
                self.frontend_process.wait(timeout=5)
                self.logger.info("前端开发服务器已停止")
            except subprocess.TimeoutExpired:
                self.frontend_process.kill()
                self.logger.warning("强制终止前端开发服务器")
            except Exception as e:
                self.logger.error(f"停止前端服务器失败: {e}")
                
        # 停止后端进程
        if self.backend_process:
            try:
                self.backend_process.terminate()
                self.backend_process.wait(timeout=10)
                self.logger.info("后端服务已停止")
            except subprocess.TimeoutExpired:
                self.backend_process.kill()
                self.logger.warning("强制终止后端服务")
            except Exception as e:
                self.logger.error(f"停止后端服务失败: {e}")
                
        self.logger.info("应用程序已停止")
        
def main():
    """主函数"""
    import argparse
    
    parser = argparse.ArgumentParser(description='身体平衡评估系统')
    parser.add_argument('--mode', choices=['development', 'production'], 
                       default='development', help='运行模式')
    parser.add_argument('--host', default='127.0.0.1', help='服务器主机')
    parser.add_argument('--port', type=int, default=5000, help='服务器端口')
    parser.add_argument('--no-browser', action='store_true', help='不自动打开浏览器')
    parser.add_argument('--log-level', choices=['DEBUG', 'INFO', 'WARNING', 'ERROR'],
                       default='INFO', help='日志级别')
    
    args = parser.parse_args()
    
    # 更新配置
    config = Config()
    config.set('APP', 'mode', args.mode)
    config.set('APP', 'auto_open_browser', str(not args.no_browser))
    config.set('SERVER', 'host', args.host)
    config.set('SERVER', 'port', str(args.port))
    
    # 设置日志级别
    import logging
    logging.getLogger().setLevel(getattr(logging, args.log_level))
    
    # 启动应用程序
    launcher = ApplicationLauncher()
    try:
        success = launcher.start()
        sys.exit(0 if success else 1)
    except Exception as e:
        print(f"启动失败: {e}")
        sys.exit(1)
        
if __name__ == '__main__':
    main()