package platform

import (
	"context"
	"io"
	"os"
	"os/exec"
	"path/filepath"

	"golang.org/x/sys/windows/registry"
)

// WindowsPlatform Windows 平台实现
type WindowsPlatform struct {
	homeDir string
}

// NewWindowsPlatform 创建 Windows 平台实例
func NewWindowsPlatform() *WindowsPlatform {
	return &WindowsPlatform{
		homeDir: os.Getenv("USERPROFILE"),
	}
}

func (p *WindowsPlatform) OS() string   { return "windows" }
func (p *WindowsPlatform) Arch() string { return os.Getenv("PROCESSOR_ARCHITECTURE") }

func (p *WindowsPlatform) HomeDir() string {
	return p.homeDir
}

func (p *WindowsPlatform) ConfigDir() string {
	if dir := os.Getenv("APPDATA"); dir != "" {
		return dir
	}
	return p.homeDir + "\\AppData\\Roaming"
}

func (p *WindowsPlatform) DataDir() string {
	if dir := os.Getenv("LOCALAPPDATA"); dir != "" {
		return dir
	}
	return p.homeDir + "\\AppData\\Local"
}

func (p *WindowsPlatform) GetEnvVar(key string) string {
	return os.Getenv(key)
}

func (p *WindowsPlatform) SetEnvVar(ctx context.Context, key, value string) error {
	cmd := exec.CommandContext(ctx, "setx", key, value)
	return cmd.Run()
}

func (p *WindowsPlatform) AddToPath(ctx context.Context, dir string) error {
	currentPath := os.Getenv("PATH")
	newPath := dir + ";" + currentPath
	return p.SetEnvVar(ctx, "PATH", newPath)
}

func (p *WindowsPlatform) IsAdmin() bool {
	// 检查 Windows 上是否以管理员身份运行
	cmd := exec.Command("net", "session")
	err := cmd.Run()
	return err == nil
}

func (p *WindowsPlatform) PackageManagers() []string {
	var pms []string
	if _, err := exec.LookPath("scoop"); err == nil {
		pms = append(pms, "scoop")
	}
	if _, err := exec.LookPath("choco"); err == nil {
		pms = append(pms, "chocolatey")
	}
	if _, err := exec.LookPath("winget"); err == nil {
		pms = append(pms, "winget")
	}
	return pms
}

func (p *WindowsPlatform) DefaultShell() string {
	if _, err := exec.LookPath("pwsh"); err == nil {
		return "pwsh" // PowerShell 7+ 版本
	}
	return "powershell" // Windows PowerShell 5.1
}

// InstallFont 安装字体
func (p *WindowsPlatform) InstallFont(ctx context.Context, fontPath string) error {
	// 目标路径为 C:\Users\<User>\AppData\Local\Microsoft\Windows\Fonts
	// 也可以使用 C:\Users\<User>\AppData\Roaming\Microsoft\Windows\Fonts，但 Local 更合适
	destDir := filepath.Join(os.Getenv("LOCALAPPDATA"), "Microsoft", "Windows", "Fonts")

	// 确保目标目录存在
	os.MkdirAll(destDir, 0755)

	// 获取字体文件名
	fontName := filepath.Base(fontPath)
	// 目标路径
	destPath := filepath.Join(destDir, fontName)

	// 复制字体文件到目标路径
	input, err := os.Open(fontPath)
	if err != nil {
		return err
	}
	defer input.Close()

	output, err := os.Create(destPath)
	if err != nil {
		return err
	}

	defer output.Close()
	_, err = io.Copy(output, input)
	if err != nil {
		return err
	}

	// 写注册表以注册字体
	key, _, err := registry.CreateKey(registry.CURRENT_USER, `Software\Microsoft\Windows NT\CurrentVersion\Fonts`, registry.ALL_ACCESS)
	if err != nil {
		return err
	}
	defer key.Close()
	regName := fontName + " (TrueType)"

	return key.SetStringValue(regName, destPath)
}