package files

import (
	"sort"

	"github.com/calmh/syncthing/scanner"
)

type SortBy func(p scanner.File) int

func (by SortBy) Sort(files []scanner.File) {
	ps := &fileSorter{
		files: files,
		by:    by,
	}
	sort.Sort(ps)
}

type fileSorter struct {
	files []scanner.File
	by    func(p1 scanner.File) int
}

func (s *fileSorter) Len() int {
	return len(s.files)
}

func (s *fileSorter) Swap(i, j int) {
	s.files[i], s.files[j] = s.files[j], s.files[i]
}

func (s *fileSorter) Less(i, j int) bool {
	return s.by(s.files[i]) > s.by(s.files[j])
}