//go:build !windows

package disk

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

func IsMountPoint(path string) bool {
	pathInfo, err := os.Stat(path)
	if err != nil {
		return false
	}

	parent := filepath.Dir(filepath.Clean(path))
	parentInfo, err := os.Stat(parent)
	if err != nil {
		return false
	}

	pathStat, ok := pathInfo.Sys().(*syscall.Stat_t)
	if !ok {
		return false
	}
	parentStat, ok := parentInfo.Sys().(*syscall.Stat_t)
	if !ok {
		return false
	}

	return pathStat.Dev != parentStat.Dev
}

func DiskUsage(mountPath string) (total, free int64, err error) {
	var stat syscall.Statfs_t
	if err = syscall.Statfs(mountPath, &stat); err != nil {
		return 0, 0, err
	}
	total = int64(stat.Blocks) * int64(stat.Bsize)
	free = int64(stat.Bavail) * int64(stat.Bsize)
	return total, free, nil
}