package system

import (
	"fmt"
	"os/exec"
	"runtime"
	"strings"

	"github.com/azoic/wormhole-client/pkg/logger"
)

// SystemProxyManager 系统代理管理器
type SystemProxyManager struct {
	originalSettings map[string]string
}

// NewSystemProxyManager 创建系统代理管理器
func NewSystemProxyManager() *SystemProxyManager {
	return &SystemProxyManager{
		originalSettings: make(map[string]string),
	}
}

// SetGlobalProxy 设置全局代理
func (s *SystemProxyManager) SetGlobalProxy(httpProxy, httpsProxy, socksProxy string) error {
	switch runtime.GOOS {
	case "darwin":
		return s.setMacOSProxy(httpProxy, httpsProxy, socksProxy)
	case "windows":
		return s.setWindowsProxy(httpProxy, httpsProxy, socksProxy)
	case "linux":
		return s.setLinuxProxy(httpProxy, httpsProxy, socksProxy)
	default:
		return fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
	}
}

// RestoreProxy 恢复原始代理设置
func (s *SystemProxyManager) RestoreProxy() error {
	switch runtime.GOOS {
	case "darwin":
		return s.restoreMacOSProxy()
	case "windows":
		return s.restoreWindowsProxy()
	case "linux":
		return s.restoreLinuxProxy()
	default:
		return fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
	}
}

// macOS 代理设置
func (s *SystemProxyManager) setMacOSProxy(httpProxy, httpsProxy, socksProxy string) error {
	logger.Info("Setting macOS system proxy...")

	// 获取网络服务名称
	networkService, err := s.getMacOSNetworkService()
	if err != nil {
		return fmt.Errorf("failed to get network service: %v", err)
	}

	// 保存原始设置
	if err := s.saveMacOSOriginalSettings(networkService); err != nil {
		logger.Warn("Failed to save original proxy settings: %v", err)
	}

	// 设置HTTP代理
	if httpProxy != "" {
		if err := s.runCommand("networksetup", "-setwebproxy", networkService,
			s.parseProxyHost(httpProxy), s.parseProxyPort(httpProxy)); err != nil {
			return fmt.Errorf("failed to set HTTP proxy: %v", err)
		}

		if err := s.runCommand("networksetup", "-setwebproxystate", networkService, "on"); err != nil {
			return fmt.Errorf("failed to enable HTTP proxy: %v", err)
		}
	}

	// 设置HTTPS代理
	if httpsProxy != "" {
		if err := s.runCommand("networksetup", "-setsecurewebproxy", networkService,
			s.parseProxyHost(httpsProxy), s.parseProxyPort(httpsProxy)); err != nil {
			return fmt.Errorf("failed to set HTTPS proxy: %v", err)
		}

		if err := s.runCommand("networksetup", "-setsecurewebproxystate", networkService, "on"); err != nil {
			return fmt.Errorf("failed to enable HTTPS proxy: %v", err)
		}
	}

	// 设置SOCKS代理
	if socksProxy != "" {
		if err := s.runCommand("networksetup", "-setsocksfirewallproxy", networkService,
			s.parseProxyHost(socksProxy), s.parseProxyPort(socksProxy)); err != nil {
			return fmt.Errorf("failed to set SOCKS proxy: %v", err)
		}

		if err := s.runCommand("networksetup", "-setsocksfirewallproxystate", networkService, "on"); err != nil {
			return fmt.Errorf("failed to enable SOCKS proxy: %v", err)
		}
	}

	logger.Info("macOS system proxy configured successfully")
	return nil
}

// 获取macOS网络服务名称
func (s *SystemProxyManager) getMacOSNetworkService() (string, error) {
	output, err := exec.Command("networksetup", "-listallnetworkservices").Output()
	if err != nil {
		return "", err
	}

	lines := strings.Split(string(output), "\n")
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line != "" && !strings.HasPrefix(line, "*") && !strings.Contains(line, "An asterisk") {
			// 优先选择Wi-Fi，否则选择第一个可用的服务
			if strings.Contains(strings.ToLower(line), "wi-fi") || strings.Contains(strings.ToLower(line), "wifi") {
				return line, nil
			}
		}
	}

	// 如果没找到Wi-Fi，返回第一个可用的服务
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line != "" && !strings.HasPrefix(line, "*") && !strings.Contains(line, "An asterisk") {
			return line, nil
		}
	}

	return "", fmt.Errorf("no network service found")
}

// 保存macOS原始代理设置
func (s *SystemProxyManager) saveMacOSOriginalSettings(networkService string) error {
	// 保存HTTP代理状态
	if output, err := exec.Command("networksetup", "-getwebproxy", networkService).Output(); err == nil {
		s.originalSettings["http_proxy"] = string(output)
	}

	// 保存HTTPS代理状态
	if output, err := exec.Command("networksetup", "-getsecurewebproxy", networkService).Output(); err == nil {
		s.originalSettings["https_proxy"] = string(output)
	}

	// 保存SOCKS代理状态
	if output, err := exec.Command("networksetup", "-getsocksfirewallproxy", networkService).Output(); err == nil {
		s.originalSettings["socks_proxy"] = string(output)
	}

	s.originalSettings["network_service"] = networkService
	return nil
}

// 恢复macOS代理设置
func (s *SystemProxyManager) restoreMacOSProxy() error {
	networkService, exists := s.originalSettings["network_service"]
	if !exists {
		return fmt.Errorf("no network service information saved")
	}

	logger.Info("Restoring macOS system proxy...")

	// 关闭所有代理
	s.runCommand("networksetup", "-setwebproxystate", networkService, "off")
	s.runCommand("networksetup", "-setsecurewebproxystate", networkService, "off")
	s.runCommand("networksetup", "-setsocksfirewallproxystate", networkService, "off")

	logger.Info("macOS system proxy restored")
	return nil
}

// Windows 代理设置（简化实现）
func (s *SystemProxyManager) setWindowsProxy(httpProxy, httpsProxy, socksProxy string) error {
	logger.Warn("Windows proxy setting not fully implemented")
	return fmt.Errorf("Windows proxy setting not implemented yet")
}

func (s *SystemProxyManager) restoreWindowsProxy() error {
	logger.Warn("Windows proxy restoration not fully implemented")
	return nil
}

// Linux 代理设置（简化实现）
func (s *SystemProxyManager) setLinuxProxy(httpProxy, httpsProxy, socksProxy string) error {
	logger.Warn("Linux proxy setting not fully implemented")
	return fmt.Errorf("Linux proxy setting not implemented yet")
}

func (s *SystemProxyManager) restoreLinuxProxy() error {
	logger.Warn("Linux proxy restoration not fully implemented")
	return nil
}

// 辅助函数
func (s *SystemProxyManager) runCommand(name string, args ...string) error {
	cmd := exec.Command(name, args...)
	output, err := cmd.CombinedOutput()
	if err != nil {
		logger.Error("Command failed: %s %v, output: %s", name, args, string(output))
		return err
	}
	return nil
}

func (s *SystemProxyManager) parseProxyHost(proxy string) string {
	// 简单解析，格式: host:port
	parts := strings.Split(proxy, ":")
	if len(parts) >= 1 {
		return parts[0]
	}
	return proxy
}

func (s *SystemProxyManager) parseProxyPort(proxy string) string {
	// 简单解析，格式: host:port
	parts := strings.Split(proxy, ":")
	if len(parts) >= 2 {
		return parts[1]
	}
	return "8080" // 默认端口
}