package utils

import (
	"io"
	"os"
	"path/filepath"
)

// CopyPath copies a file or directory from src to dest
func CopyPath(src, dest string) error {
	info, err := os.Stat(src)
	if err != nil {
		return err
	}

	if info.IsDir() {
		return copyDir(src, dest)
	}
	return CopyFile(src, dest)
}

// CopyFile copies a single file from src to dest
func CopyFile(src, dest string) error {
	srcFile, err := os.Open(src)
	if err != nil {
		return err
	}
	defer srcFile.Close()

	if err := os.MkdirAll(filepath.Dir(dest), 0755); err != nil {
		return err
	}

	destFile, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer destFile.Close()

	if _, err := io.Copy(destFile, srcFile); err != nil {
		return err
	}

	info, err := os.Stat(src)
	if err == nil {
		os.Chmod(dest, info.Mode())
	}

	return nil
}

func copyDir(src, dest string) error {
	info, err := os.Stat(src)
	if err != nil {
		return err
	}

	if err := os.MkdirAll(dest, info.Mode()); err != nil {
		return err
	}

	entries, err := os.ReadDir(src)
	if err != nil {
		return err
	}

	for _, entry := range entries {
		srcPath := filepath.Join(src, entry.Name())
		destPath := filepath.Join(dest, entry.Name())

		if err := CopyPath(srcPath, destPath); err != nil {
			return err
		}
	}

	return nil
}

// IsInDocker 判断程序是否运行在 Docker 容器中
func IsInDocker() bool {
	if _, err := os.Stat("/.dockerenv"); err == nil {
		return true
	}
	return false
}