// 主程序包 / Main package
package main

// 导入所需的包 / Import required packages
import (
	"bufio"
	"crypto/rand"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"os/user"
	"path/filepath"
	"runtime"
	"strings"
	"time"

	"github.com/fatih/color"
	"golang.org/x/sys/windows"
)

// 语言类型和常量 / Language type and constants
type Language string

const (
	CN Language = "cn"
	EN Language = "en"

	// Version constant
	Version = "1.0.1"
)

// TextResource 存储多语言文本 / TextResource stores multilingual text
type TextResource struct {
	SuccessMessage   string
	RestartMessage   string
	ReadingConfig    string
	GeneratingIds    string
	PressEnterToExit string
	ErrorPrefix      string
	PrivilegeError   string
	RunAsAdmin       string
	RunWithSudo      string
	SudoExample      string
}

// StorageConfig 优化的存储配置结构 / StorageConfig optimized storage configuration struct
type StorageConfig struct {
	TelemetryMacMachineId string    `json:"telemetry.macMachineId"`
	TelemetryMachineId    string    `json:"telemetry.machineId"`
	TelemetryDevDeviceId  string    `json:"telemetry.devDeviceId"`
	LastModified          time.Time `json:"lastModified"`
	Version               string    `json:"version"`
}

// AppError 定义错误类型 / AppError defines error types
type AppError struct {
	Op   string
	Path string
	Err  error
}

// ProgressSpinner 用于显示进度动画 / ProgressSpinner for showing progress animation
type ProgressSpinner struct {
	frames  []string
	current int
	message string
}

// 全局变量 / Global variables
var (
	currentLanguage = CN // 默认为中文 / Default to Chinese

	texts = map[Language]TextResource{
		CN: {
			SuccessMessage:   "[√] 配置文件已成功更新!",
			RestartMessage:   "[!] 请手动重启 Cursor 以使更新生效",
			ReadingConfig:    "正在读取配置文件...",
			GeneratingIds:    "正在生成新的标识符...",
			PressEnterToExit: "按回车键退出程序...",
			ErrorPrefix:      "程序发生严重错误: %v",
			PrivilegeError:   "\n[!] 错误：需要管理员权限",
			RunAsAdmin:       "请右键点击程序，选择「以管理员身份运行」",
			RunWithSudo:      "请使用 sudo 命令运行此程序",
			SudoExample:      "示例: sudo %s",
		},
		EN: {
			SuccessMessage:   "[√] Configuration file updated successfully!",
			RestartMessage:   "[!] Please restart Cursor manually for changes to take effect",
			ReadingConfig:    "Reading configuration file...",
			GeneratingIds:    "Generating new identifiers...",
			PressEnterToExit: "Press Enter to exit...",
			ErrorPrefix:      "Program encountered a serious error: %v",
			PrivilegeError:   "\n[!] Error: Administrator privileges required",
			RunAsAdmin:       "Please right-click and select 'Run as Administrator'",
			RunWithSudo:      "Please run this program with sudo",
			SudoExample:      "Example: sudo %s",
		},
	}
)

// Error implementation for AppError
func (e *AppError) Error() string {
	if e.Path != "" {
		return fmt.Sprintf("%s: %v [Path: %s]", e.Op, e.Err, e.Path)
	}
	return fmt.Sprintf("%s: %v", e.Op, e.Err)
}

// NewStorageConfig 创建新的配置实例 / Creates a new configuration instance
func NewStorageConfig() *StorageConfig {
	return &StorageConfig{
		TelemetryMacMachineId: generateMachineId(),
		TelemetryMachineId:    generateMachineId(),
		TelemetryDevDeviceId:  generateDevDeviceId(),
		LastModified:          time.Now(),
		Version:               Version,
	}
}

// 生成类似原始machineId的字符串(64位小写十六进制) / Generate a string similar to the original machineId (64-bit lowercase hex)
func generateMachineId() string {
	data := make([]byte, 32)
	if _, err := rand.Read(data); err != nil {
		panic(fmt.Errorf("failed to generate random data: %v", err))
	}
	hash := sha256.Sum256(data)
	return hex.EncodeToString(hash[:])
}

// 生成类似原始devDeviceId的字符串(标准UUID格式) / Generate a string similar to the original devDeviceId (standard UUID format)
func generateDevDeviceId() string {
	uuid := make([]byte, 16)
	if _, err := rand.Read(uuid); err != nil {
		panic(fmt.Errorf("failed to generate UUID: %v", err))
	}

	uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
	uuid[8] = (uuid[8] & 0x3f) | 0x80 // RFC 4122 variant

	return fmt.Sprintf("%x-%x-%x-%x-%x",
		uuid[0:4],
		uuid[4:6],
		uuid[6:8],
		uuid[8:10],
		uuid[10:16])
}

// NewProgressSpinner creates a new progress spinner
func NewProgressSpinner(message string) *ProgressSpinner {
	return &ProgressSpinner{
		frames:  []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"},
		message: message,
	}
}

// Spin advances the spinner animation
func (s *ProgressSpinner) Spin() {
	frame := s.frames[s.current%len(s.frames)]
	s.current++
	fmt.Printf("\r%s %s", color.CyanString(frame), s.message)
}

// Stop ends the spinner animation
func (s *ProgressSpinner) Stop() {
	fmt.Println()
}

// File and system operations

func getConfigPath() (string, error) {
	var configDir string
	switch runtime.GOOS {
	case "windows":
		configDir = filepath.Join(os.Getenv("APPDATA"), "Cursor", "User", "globalStorage")
	case "darwin":
		homeDir, err := os.UserHomeDir()
		if err != nil {
			return "", err
		}
		configDir = filepath.Join(homeDir, "Library", "Application Support", "Cursor", "User", "globalStorage")
	case "linux":
		homeDir, err := os.UserHomeDir()
		if err != nil {
			return "", err
		}
		configDir = filepath.Join(homeDir, ".config", "Cursor", "User", "globalStorage")
	default:
		return "", fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
	}
	return filepath.Join(configDir, "storage.json"), nil
}

func safeWriteFile(path string, data []byte, perm os.FileMode) error {
	dir := filepath.Dir(path)
	if err := os.MkdirAll(dir, 0755); err != nil {
		return &AppError{"create directory", dir, err}
	}

	tmpPath := path + ".tmp"
	if err := os.WriteFile(tmpPath, data, perm); err != nil {
		return &AppError{"write temporary file", tmpPath, err}
	}

	if err := os.Rename(tmpPath, path); err != nil {
		os.Remove(tmpPath)
		return &AppError{"rename file", path, err}
	}

	return nil
}

func setFilePermissions(filePath string) error {
	return os.Chmod(filePath, 0444)
}

// Process management functions

func killCursorProcesses() error {
	if runtime.GOOS == "windows" {
		// First try graceful shutdown
		exec.Command("taskkill", "/IM", "Cursor.exe").Run()
		exec.Command("taskkill", "/IM", "cursor.exe").Run()

		time.Sleep(time.Second)

		// Force kill any remaining instances
		exec.Command("taskkill", "/F", "/IM", "Cursor.exe").Run()
		exec.Command("taskkill", "/F", "/IM", "cursor.exe").Run()
	} else {
		exec.Command("pkill", "-f", "Cursor").Run()
		exec.Command("pkill", "-f", "cursor").Run()
	}
	return nil
}

func checkCursorRunning() bool {
	var cmd *exec.Cmd
	if runtime.GOOS == "windows" {
		cmd = exec.Command("tasklist", "/FI", "IMAGENAME eq Cursor.exe", "/NH")
	} else {
		cmd = exec.Command("pgrep", "-f", "Cursor")
	}

	output, _ := cmd.Output()
	return strings.Contains(string(output), "Cursor") || strings.Contains(string(output), "cursor")
}

// UI and display functions

func clearScreen() {
	var cmd *exec.Cmd
	if runtime.GOOS == "windows" {
		cmd = exec.Command("cmd", "/c", "cls")
	} else {
		cmd = exec.Command("clear")
	}
	cmd.Stdout = os.Stdout
	cmd.Run()
}

func showProgress(message string) {
	spinner := NewProgressSpinner(message)
	for i := 0; i < 15; i++ {
		spinner.Spin()
		time.Sleep(100 * time.Millisecond)
	}
	spinner.Stop()
}

func printCyberpunkBanner() {
	cyan := color.New(color.FgCyan, color.Bold)
	yellow := color.New(color.FgYellow, color.Bold)
	magenta := color.New(color.FgMagenta, color.Bold)
	green := color.New(color.FgGreen, color.Bold)

	banner := `
    ██████╗██╗   ██╗██████╗ ███████╗ ██████╗ ██████╗ 
   ██╔════╝██║   ██║██╔══██╗██╔════╝██╔═══██╗██╔══██╗
   ██║     ██║   ██║██████╔╝███████╗██║   ██║██████╔╝
   ██║     ██║   ██║██╔══██╗╚════██║██║   ██║██╔══██╗
   ╚██████╗╚██████╔╝██║  ██║███████║╚██████╔╝██║  ██║
    ╚════╝ ╚═════╝ ╚═╝  ╚═╝╚══════╝ ╚═════╝ ╚═╝  ╚═╝
    `
	cyan.Println(banner)
	yellow.Println("\t\t>> Cursor ID Modifier v1.0 <<")
	magenta.Println("\t\t   [ By Pancake Fruit Rolled Shark Chili ]")

	langText := "当前语言/Language: "
	if currentLanguage == CN {
		langText += "简体中文"
	} else {
		langText += "English"
	}
	green.Printf("\n\t\t   %s\n\n", langText)
}

func showSuccess() {
	text := texts[currentLanguage]
	successColor := color.New(color.FgGreen, color.Bold)
	warningColor := color.New(color.FgYellow, color.Bold)

	successColor.Printf("\n%s\n", text.SuccessMessage)
	warningColor.Printf("%s\n", text.RestartMessage)
}

func showPrivilegeError() {
	text := texts[currentLanguage]
	red := color.New(color.FgRed, color.Bold)
	yellow := color.New(color.FgYellow)

	red.Println(text.PrivilegeError)
	if runtime.GOOS == "windows" {
		yellow.Println(text.RunAsAdmin)
	} else {
		yellow.Println(text.RunWithSudo)
		yellow.Printf(text.SudoExample, os.Args[0])
	}
}

func showIdComparison(oldConfig *StorageConfig, newConfig *StorageConfig) {
	cyan := color.New(color.FgCyan)
	yellow := color.New(color.FgYellow)

	fmt.Println("\n=== ID Modification Comparison / ID 修改对比 ===")

	if oldConfig != nil {
		cyan.Println("\n[Original IDs / 原始 ID]")
		yellow.Printf("Machine ID: %s\n", oldConfig.TelemetryMachineId)
		yellow.Printf("Mac Machine ID: %s\n", oldConfig.TelemetryMacMachineId)
		yellow.Printf("Dev Device ID: %s\n", oldConfig.TelemetryDevDeviceId)
	}

	cyan.Println("\n[Newly Generated IDs / 新生成 ID]")
	yellow.Printf("Machine ID: %s\n", newConfig.TelemetryMachineId)
	yellow.Printf("Mac Machine ID: %s\n", newConfig.TelemetryMacMachineId)
	yellow.Printf("Dev Device ID: %s\n", newConfig.TelemetryDevDeviceId)
	fmt.Println()
}

// Configuration operations

func saveConfig(config *StorageConfig) error {
	configPath, err := getConfigPath()
	if err != nil {
		return err
	}

	content, err := json.MarshalIndent(config, "", "    ")
	if err != nil {
		return &AppError{"generate JSON", "", err}
	}

	if err := os.Chmod(configPath, 0666); err != nil && !os.IsNotExist(err) {
		return &AppError{"modify file permissions", configPath, err}
	}

	if err := safeWriteFile(configPath, content, 0666); err != nil {
		return err
	}

	return setFilePermissions(configPath)
}

func readExistingConfig() (*StorageConfig, error) {
	configPath, err := getConfigPath()
	if err != nil {
		return nil, err
	}

	data, err := os.ReadFile(configPath)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, err
	}

	var config StorageConfig
	if err := json.Unmarshal(data, &config); err != nil {
		return nil, err
	}

	return &config, nil
}

func loadAndUpdateConfig() (*StorageConfig, error) {
	configPath, err := getConfigPath()
	if err != nil {
		return nil, err
	}

	text := texts[currentLanguage]
	showProgress(text.ReadingConfig)

	_, err = os.ReadFile(configPath)
	if err != nil && !os.IsNotExist(err) {
		return nil, &AppError{"read config file", configPath, err}
	}

	showProgress(text.GeneratingIds)
	return NewStorageConfig(), nil
}

// System privilege functions

func checkAdminPrivileges() (bool, error) {
	switch runtime.GOOS {
	case "windows":
		cmd := exec.Command("net", "session")
		err := cmd.Run()
		return err == nil, nil

	case "darwin", "linux":
		currentUser, err := user.Current()
		if err != nil {
			return false, fmt.Errorf("failed to get current user: %v", err)
		}
		return currentUser.Uid == "0", nil

	default:
		return false, fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
	}
}

func selfElevate() error {
	verb := "runas"
	exe, err := os.Executable()
	if err != nil {
		return err
	}

	cwd, err := os.Getwd()
	if err != nil {
		return err
	}
	// 将字符串转换为UTF-16指针
	verbPtr, _ := windows.UTF16PtrFromString(verb)
	exePtr, _ := windows.UTF16PtrFromString(exe)
	cwdPtr, _ := windows.UTF16PtrFromString(cwd)
	argPtr, _ := windows.UTF16PtrFromString("")

	var showCmd int32 = 1 //SW_NORMAL

	err = windows.ShellExecute(0, verbPtr, exePtr, argPtr, cwdPtr, showCmd)
	if err != nil {
		return err
	}
	os.Exit(0)
	return nil
}

// Utility functions

func detectLanguage() Language {
	lang := os.Getenv("LANG")
	if lang == "" {
		lang = os.Getenv("LANGUAGE")
	}

	if strings.Contains(strings.ToLower(lang), "zh") {
		return CN
	}
	return EN
}

func waitExit() {
	fmt.Println("\nPress Enter to exit... / 按回车键退出程序...")
	os.Stdout.Sync()
	bufio.NewReader(os.Stdin).ReadString('\n')
}

func handleError(msg string, err error) {
	if appErr, ok := err.(*AppError); ok {
		color.Red("%s: %v", msg, appErr)
	} else {
		color.Red("%s: %v", msg, err)
	}
}

// Main program entry

func main() {
	defer func() {
		if r := recover(); r != nil {
			color.Red(texts[currentLanguage].ErrorPrefix, r)
			fmt.Println("\nAn error occurred! / 发生错误！")
			waitExit()
		}
	}()

	os.Stdout.Sync()
	currentLanguage = detectLanguage()

	isAdmin, err := checkAdminPrivileges()
	if err != nil {
		handleError("permission check failed", err)
		waitExit()
		return
	}

	if !isAdmin && runtime.GOOS == "windows" {
		fmt.Println("Requesting administrator privileges... / 请求管理员权限...")
		if err := selfElevate(); err != nil {
			handleError("failed to elevate privileges", err)
			showPrivilegeError()
			waitExit()
			return
		}
		return
	} else if !isAdmin {
		showPrivilegeError()
		waitExit()
		return
	}

	if checkCursorRunning() {
		fmt.Println("\nDetected running Cursor instance(s). Closing... / 检测到正在运行的 Cursor 实例，正在关闭...")
		if err := killCursorProcesses(); err != nil {
			fmt.Println("Warning: Could not close all Cursor instances. Please close them manually. / 警告：无法关闭所有 Cursor 实例，请手动关闭。")
			waitExit()
			return
		}

		time.Sleep(2 * time.Second)
		if checkCursorRunning() {
			fmt.Println("\nWarning: Cursor is still running. Please close it manually. / 警告：Cursor 仍在运行，请手动关闭。")
			waitExit()
			return
		}
	}

	clearScreen()
	printCyberpunkBanner()

	oldConfig, err := readExistingConfig()
	if err != nil {
		oldConfig = nil
	}

	config, err := loadAndUpdateConfig()
	if err != nil {
		handleError("configuration update failed", err)
		waitExit()
		return
	}

	showIdComparison(oldConfig, config)

	if err := saveConfig(config); err != nil {
		handleError("failed to save configuration", err)
		waitExit()
		return
	}

	showSuccess()
	fmt.Println("\nOperation completed! / 操作完成！")
	waitExit()
}