#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Clash管理器 - 负责Clash Core进程的启动、停止和API调用
"""

import os
import time
import signal
import logging
import subprocess
import requests
import json
from .debug_tools import run_debug_diagnostics

logger = logging.getLogger(__name__)

class ClashManager:
    """管理Clash Core进程和与其API的交互"""
    
    def __init__(self, config_path, clash_path, api_port=9090, proxy_port=7890):
        """
        初始化Clash管理器
        
        Args:
            config_path: Clash配置文件路径
            clash_path: Clash可执行文件路径
            api_port: Clash API监听端口
            proxy_port: Clash代理监听端口
        """
        self.config_path = os.path.abspath(config_path)
        self.clash_path = os.path.abspath(clash_path)
        self.api_port = api_port
        self.proxy_port = proxy_port
        self.api_base_url = f"http://127.0.0.1:{api_port}"
        self.clash_process = None
        
        # 确保Clash可执行文件存在
        if not os.path.exists(clash_path):
            raise FileNotFoundError(f"Clash可执行文件未找到: {clash_path}")
    
    def start_clash(self):
        """启动Clash Core进程"""
        if self.clash_process and self.clash_process.poll() is None:
            logger.info("Clash Core已经在运行中")
            return
        
        # 确保配置文件存在
        if not os.path.exists(self.config_path):
            # 检查目录是否存在
            config_dir = os.path.dirname(self.config_path)
            if not os.path.exists(config_dir):
                try:
                    os.makedirs(config_dir, exist_ok=True)
                    logger.info(f"创建了配置目录: {config_dir}")
                except Exception as e:
                    logger.error(f"无法创建配置目录: {str(e)}")
            
            # 如果目录存在但文件不存在，尝试创建一个基础配置
            try:
                with open(self.config_path, "w", encoding="utf-8") as f:
                    f.write(self._get_base_config())
                logger.info(f"创建了基础配置文件: {self.config_path}")
            except Exception as e:
                logger.error(f"无法创建配置文件: {str(e)}")
                raise FileNotFoundError(f"Clash配置文件未找到且无法创建: {self.config_path}")
        
        # 验证配置文件内容
        self._validate_config_file()
        
        # 运行调试诊断
        logger.info("运行环境诊断...")
        try:
            diagnostics = run_debug_diagnostics(self.clash_path, self.config_path)
            if not diagnostics.get("clash_binary", {}).get("is_executable", False):
                logger.warning("Clash Core不是可执行文件，尝试设置执行权限")
                try:
                    os.chmod(self.clash_path, 0o755)
                    logger.info("已设置执行权限")
                except Exception as e:
                    logger.error(f"设置执行权限失败: {str(e)}")
        except Exception as e:
            logger.error(f"运行诊断时出错: {str(e)}")
        
        # 设置Clash命令行参数 (兼容Clash Meta)
        cmd = [
            self.clash_path,
            "-f", self.config_path,
            "-d", os.path.dirname(self.config_path)
        ]
        
        # 为Clash Meta添加额外参数
        if "meta" in self.clash_path.lower():
            # Clash Meta特有参数
            cmd.extend([
                "-ext-ctl", f"127.0.0.1:{self.api_port}",
                # 如果需要可以添加更多Clash Meta特有参数
            ])
        else:
            # 原始Clash参数
            cmd.extend([
                "-ext-ctl", f"127.0.0.1:{self.api_port}",
                "-ext-ui", "" # 禁用外部UI
            ])
        
        # 启动Clash进程
        logger.info(f"正在启动Clash Core: {' '.join(cmd)}")
        
        # 首先尝试检查Clash可执行文件是否存在并且可执行
        if not os.path.exists(self.clash_path):
            raise FileNotFoundError(f"Clash可执行文件未找到: {self.clash_path}")
        
        # 检查Clash文件是否有执行权限
        try:
            # 尝试设置执行权限
            os.chmod(self.clash_path, 0o755)
            logger.info(f"已设置Clash Core的执行权限")
        except Exception as e:
            logger.warning(f"无法设置执行权限: {str(e)}, 尝试继续执行...")
        
        # 启动进程并捕获输出
        try:
            self.clash_process = subprocess.Popen(
                cmd,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                universal_newlines=True
            )
            
            # 等待Clash启动
            logger.info("等待Clash Core启动...")
            time.sleep(2)
            
            # 检查进程是否成功启动
            if self.clash_process.poll() is not None:
                # 如果进程已经退出，获取错误输出
                stdout, stderr = self.clash_process.communicate()
                logger.error(f"Clash启动失败，退出代码: {self.clash_process.returncode}")
                logger.error(f"标准输出: {stdout}")
                logger.error(f"错误输出: {stderr}")
                
                # 如果没有错误输出，尝试读取配置文件周围的日志
                if not stderr.strip():
                    try:
                        # 查看配置文件内容
                        with open(self.config_path, 'r', encoding='utf-8') as f:
                            config_content = f.read()
                        logger.error(f"配置文件内容预览 (前100字符): {config_content[:100]}")
                    except Exception as file_err:
                        logger.error(f"读取配置文件失败: {str(file_err)}")
                
                # 创建更有意义的错误消息
                error_message = stderr or stdout or "无错误信息，可能是程序无法执行或立即崩溃"
                raise RuntimeError(f"Clash启动失败: {error_message}")
            
            # 进程仍在运行，验证API是否可访问
            logger.info("进程仍在运行，验证API...")
            
            try:
                # 尝试多次连接API，有时需要一些时间
                max_retries = 3
                for i in range(max_retries):
                    try:
                        self._call_api("GET", "/version")
                        logger.info("Clash API已就绪")
                        return  # 成功，退出函数
                    except Exception as api_err:
                        if i < max_retries - 1:
                            logger.warning(f"API连接尝试 {i+1}/{max_retries} 失败: {str(api_err)}，重试...")
                            time.sleep(1)
                        else:
                            # 最后一次尝试失败，捕获并记录错误
                            stdout, stderr = self.clash_process.communicate(timeout=1)
                            logger.error(f"API连接失败，标准输出: {stdout}")
                            logger.error(f"API连接失败，错误输出: {stderr}")
                            # 杀掉进程并抛出异常
                            self.stop_clash()
                            raise RuntimeError(f"无法连接到Clash API: {str(api_err)}，进程输出: {stderr or stdout}")
            except Exception as e:
                # 捕获其他异常
                self.stop_clash()
                raise RuntimeError(f"验证API时出错: {str(e)}")
                
        except (subprocess.SubprocessError, OSError) as e:
            # 进程启动失败
            logger.error(f"启动Clash进程时出错: {str(e)}")
            raise RuntimeError(f"无法启动Clash进程: {str(e)}")
    
    def stop_clash(self):
        """停止Clash Core进程"""
        if self.clash_process and self.clash_process.poll() is None:
            logger.info("正在停止Clash Core...")
            
            # 尝试优雅地终止进程
            self.clash_process.terminate()
            
            # 等待进程终止
            try:
                self.clash_process.wait(timeout=5)
            except subprocess.TimeoutExpired:
                # 如果进程没有及时终止，强制结束
                logger.warning("Clash进程未响应终止信号，强制结束...")
                self.clash_process.kill()
            
            self.clash_process = None
            logger.info("Clash Core已停止")
    
    def restart_clash(self):
        """重启Clash Core进程"""
        logger.info("正在重启Clash Core...")
        self.stop_clash()
        time.sleep(1)  # 给进程一些时间完全终止
        self.start_clash()
        logger.info("Clash Core已重启")
    
    def get_nodes(self):
        """
        获取所有可用的代理节点名称列表
        
        Returns:
            list: 节点名称列表
        """
        response = self._call_api("GET", "/proxies")
        proxies = response.get("proxies", {})
        
        # 过滤出实际的代理节点（排除DIRECT, REJECT等内置代理和策略组）
        node_names = []
        for name, proxy in proxies.items():
            if proxy.get("type") not in ["Direct", "Reject", "Selector", "URLTest", "Fallback", "LoadBalance"]:
                node_names.append(name)
        
        return node_names
    
    def switch_node(self, node_name):
        """
        切换到指定的代理节点
        
        Args:
            node_name: 节点名称
            
        Raises:
            ValueError: 如果节点名称无效
        """
        # 获取所有节点以验证目标节点存在
        all_nodes = self.get_nodes()
        if node_name not in all_nodes:
            raise ValueError(f"无效的节点名称: {node_name}")
        
        # 切换GLOBAL策略组到指定节点
        # 注意：这里假设使用GLOBAL作为顶级策略组，你可能需要根据实际配置调整
        try:
            self._call_api("PUT", "/proxies/GLOBAL", json={"name": node_name})
            logger.info(f"已切换到节点: {node_name}")
        except Exception as e:
            raise RuntimeError(f"切换节点失败: {str(e)}")
    
    def get_current_node(self):
        """
        获取当前使用的节点名称
        
        Returns:
            str: 当前节点名称
        """
        # 获取GLOBAL策略组的当前选择
        # 注意：这里假设使用GLOBAL作为顶级策略组，你可能需要根据实际配置调整
        response = self._call_api("GET", "/proxies/GLOBAL")
        return response.get("now", "unknown")
    
    def _call_api(self, method, endpoint, **kwargs):
        """
        调用Clash的API
        
        Args:
            method: HTTP方法 (GET, POST, PUT等)
            endpoint: API端点路径
            **kwargs: 传递给requests的其他参数
            
        Returns:
            dict: API响应的JSON数据
            
        Raises:
            RuntimeError: 如果API调用失败
        """
        url = f"{self.api_base_url}{endpoint}"
        logger.debug(f"调用Clash API: {method} {url}")
        
        try:
            response = requests.request(method, url, timeout=10, **kwargs)
            response.raise_for_status()
            return response.json()
        except requests.RequestException as e:
            logger.error(f"Clash API调用失败: {str(e)}")
            raise RuntimeError(f"Clash API调用失败: {str(e)}")
    
    def __del__(self):
        """析构函数，确保进程在对象销毁时被终止"""
        self.stop_clash()
    
    def _validate_config_file(self):
        """验证配置文件内容，确保基本配置存在"""
        try:
            with open(self.config_path, "r", encoding="utf-8") as f:
                content = f.read()
            
            # 检查文件大小
            if len(content) < 10:
                logger.warning(f"配置文件内容过短: {len(content)} 字节")
                # 尝试使用基础配置替换
                with open(self.config_path, "w", encoding="utf-8") as f:
                    f.write(self._get_base_config())
                logger.info("已使用基础配置替换")
                return
            
            # 检查基本配置是否存在 (非严格YAML解析，简单文本检查)
            missing_configs = []
            if "mixed-port:" not in content and "port:" not in content:
                missing_configs.append("端口配置")
            
            if "proxies:" not in content:
                missing_configs.append("代理配置")
            
            if missing_configs:
                logger.warning(f"配置文件缺少: {', '.join(missing_configs)}")
                # 如果缺少关键配置，尝试修复
                has_patch = False
                
                if "mixed-port:" not in content and "port:" not in content:
                    content = f"mixed-port: {self.proxy_port}\n" + content
                    has_patch = True
                
                if "external-controller:" not in content:
                    content = f"external-controller: 127.0.0.1:{self.api_port}\n" + content
                    has_patch = True
                
                if "proxies:" not in content:
                    content += "\nproxies:\n  - name: DIRECT\n    type: Direct\n"
                    has_patch = True
                
                if has_patch:
                    with open(self.config_path, "w", encoding="utf-8") as f:
                        f.write(content)
                    logger.info("已修补配置文件")
        
        except Exception as e:
            logger.error(f"验证配置文件时出错: {str(e)}")
            # 如果验证失败，尝试使用基础配置
            try:
                with open(self.config_path, "w", encoding="utf-8") as f:
                    f.write(self._get_base_config())
                logger.info("已使用基础配置替换")
            except Exception as write_err:
                logger.error(f"无法写入基础配置: {str(write_err)}")
    
    def _get_base_config(self):
        """返回基础Clash配置"""
        return f"""# 基础Clash配置
mixed-port: {self.proxy_port}
allow-lan: true
mode: Rule
log-level: info
external-controller: 127.0.0.1:{self.api_port}
secret: ""

proxies:
  - name: DIRECT
    type: Direct

proxy-groups:
  - name: GLOBAL
    type: select
    proxies:
      - DIRECT

rules:
  - MATCH,DIRECT
"""