//go:build darwin

package service

import (
	"fmt"
	"os"
	"os/exec"
	"os/user"
	"path/filepath"
	"strings"
)

// NewServiceManager 创建macOS服务管理器实例
func NewServiceManager() ServiceManager {
	return &DarwinServiceManager{}
}

// DarwinServiceManager macOS LaunchD服务管理器
type DarwinServiceManager struct{}

func (m *DarwinServiceManager) Install(execPath string) error {
	// 检查是否有足够权限操作系统服务
	if err := m.checkPermissions(); err != nil {
		return err
	}

	if err := ensureLogDir(); err != nil {
		return fmt.Errorf("创建日志目录失败: %v", err)
	}

	plistContent := m.generateLaunchDPlist(execPath)

	// 获取plist文件路径
	plistPath, err := m.getPlistPath()
	if err != nil {
		return fmt.Errorf("获取plist路径失败: %v", err)
	}

	// 创建目录
	if err := os.MkdirAll(filepath.Dir(plistPath), 0755); err != nil {
		return fmt.Errorf("创建plist目录失败: %v", err)
	}

	// 写入plist文件
	if err := os.WriteFile(plistPath, []byte(plistContent), 0644); err != nil {
		return fmt.Errorf("写入plist文件失败: %v", err)
	}

	// 加载服务
	cmd := exec.Command("launchctl", "load", plistPath)
	if output, err := cmd.CombinedOutput(); err != nil {
		return fmt.Errorf("加载服务失败: %v, 输出: %s", err, string(output))
	}

	return nil
}

func (m *DarwinServiceManager) Uninstall() error {

	// 停止服务
	m.Stop()

	// 获取plist文件路径
	plistPath, err := m.getPlistPath()
	if err != nil {
		return fmt.Errorf("获取plist路径失败: %v", err)
	}

	// 卸载服务
	cmd := exec.Command("launchctl", "unload", plistPath)
	cmd.CombinedOutput() // 忽略错误

	// 删除plist文件
	if err := os.Remove(plistPath); err != nil && !os.IsNotExist(err) {
		return fmt.Errorf("删除plist文件失败: %v", err)
	}

	return nil
}

func (m *DarwinServiceManager) Start() error {
	serviceName := m.getServiceIdentifier()

	cmd := exec.Command("launchctl", "start", serviceName)
	output, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("启动服务失败: %v, 输出: %s", err, string(output))
	}

	return nil
}

func (m *DarwinServiceManager) Stop() error {
	serviceName := m.getServiceIdentifier()

	cmd := exec.Command("launchctl", "stop", serviceName)
	output, err := cmd.CombinedOutput()
	if err != nil {
		return fmt.Errorf("停止服务失败: %v, 输出: %s", err, string(output))
	}

	return nil
}

func (m *DarwinServiceManager) Restart() error {
	if err := m.Stop(); err != nil {
		return err
	}

	return m.Start()
}

func (m *DarwinServiceManager) Status() (ServiceStatus, error) {
	serviceName := m.getServiceIdentifier()

	// 检查plist文件是否存在
	plistPath, err := m.getPlistPath()
	if err != nil {
		return StatusUnknown, err
	}

	if _, err := os.Stat(plistPath); os.IsNotExist(err) {
		return StatusNotInstalled, nil
	}

	cmd := exec.Command("launchctl", "list", serviceName)
	output, err := cmd.CombinedOutput()
	if err != nil {
		// 如果服务不在列表中，可能是未运行
		return StatusStopped, nil
	}

	// 简单检查输出中是否包含PID
	outputStr := string(output)
	if strings.Contains(outputStr, serviceName) && !strings.Contains(outputStr, "-") {
		return StatusRunning, nil
	}

	return StatusStopped, nil
}

func (m *DarwinServiceManager) getServiceIdentifier() string {
	return fmt.Sprintf("com.deepwn.%s", strings.ToLower(getServiceName()))
}

func (m *DarwinServiceManager) getPlistPath() (string, error) {
	serviceName := m.getServiceIdentifier()

	// 检查是否以root权限运行
	currentUser, err := user.Current()
	if err != nil {
		return "", err
	}

	if currentUser.Uid == "0" {
		// 系统级服务
		return fmt.Sprintf("/Library/LaunchDaemons/%s.plist", serviceName), nil
	} else {
		// 用户级服务
		homeDir, err := os.UserHomeDir()
		if err != nil {
			return "", err
		}
		return fmt.Sprintf("%s/Library/LaunchAgents/%s.plist", homeDir, serviceName), nil
	}
}

func (m *DarwinServiceManager) generateLaunchDPlist(execPath string) string {
	serviceName := m.getServiceIdentifier()
	logPath := getLogPath()

	// 获取用户配置目录
	userConfigDir, err := getUserConfigDir()
	if err != nil {
		// 如果获取失败，使用默认路径
		currentUser, _ := user.Current()
		if currentUser != nil {
			userConfigDir = filepath.Join(currentUser.HomeDir, ".hostsync")
		} else {
			userConfigDir = "/Users/Shared/.hostsync"
		}
	}

	return fmt.Sprintf(`<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Label</key>
	<string>%s</string>
	<key>ProgramArguments</key>
	<array>
		<string>%s</string>
		<string>service</string>
		<string>run</string>
		<string>--config</string>
		<string>%s</string>
	</array>
	<key>RunAtLoad</key>
	<true/>
	<key>KeepAlive</key>
	<true/>
	<key>StandardOutPath</key>
	<string>%s</string>
	<key>StandardErrorPath</key>
	<string>%s</string>
</dict>
</plist>
`, serviceName, execPath, userConfigDir, logPath, logPath)
}

// checkPermissions 检查是否有足够权限操作系统服务
func (m *DarwinServiceManager) checkPermissions() error {
	// 检查是否为 root 用户
	if os.Getuid() != 0 {
		return fmt.Errorf("安装系统服务需要 root 权限，请使用 sudo 运行")
	}

	// 检查 launchctl 命令是否可用
	if _, err := exec.LookPath("launchctl"); err != nil {
		return fmt.Errorf("launchctl 命令不可用: %v", err)
	}

	// 获取 plist 文件路径并检查目录权限
	plistPath, err := m.getPlistPath()
	if err != nil {
		return fmt.Errorf("获取 plist 路径失败: %v", err)
	}

	plistDir := filepath.Dir(plistPath)
	// 检查目录是否存在，如果不存在尝试创建来测试权限
	if _, err := os.Stat(plistDir); os.IsNotExist(err) {
		if err := os.MkdirAll(plistDir, 0755); err != nil {
			return fmt.Errorf("无法创建 plist 目录 %s: %v", plistDir, err)
		}
	}

	// 尝试创建一个测试文件来验证写权限
	testFile := filepath.Join(plistDir, ".hostsync-permission-test")
	if file, err := os.Create(testFile); err != nil {
		return fmt.Errorf("无法写入 plist 目录 %s: %v", plistDir, err)
	} else {
		file.Close()
		os.Remove(testFile) // 清理测试文件
	}

	return nil
}