//go:build windows

package directory

import (
	"errors"
	"io/fs"
	"path/filepath"
)

// Size walks a directory tree and returns its total size in bytes
func Size(dir string) (size int64, err error) {
	usage, err := Usage(dir)
	if err != nil {
		return 0, nil
	}
	return usage.Size, nil
}

// Usage walks a directory tree and returns its total size in bytes and the number of inodes.
func Usage(dir string) (*DiskUsage, error) {
	usage := &DiskUsage{}
	err := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			// if dir does not exist, Size() returns the error.
			// if dir/x disappeared while walking, Size() ignores dir/x.
			if errors.Is(err, fs.ErrNotExist) && path != dir {
				return nil
			}
			return err
		}

		usage.InodeCount++

		// Ignore directory sizes
		if d.IsDir() {
			return nil
		}

		fileInfo, err := d.Info()
		if err != nil {
			if errors.Is(err, fs.ErrNotExist) {
				return nil
			}
			return err
		}
		usage.Size += fileInfo.Size()

		return nil
	})
	return usage, err
}